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Viewing Signal Detail with Display Mode

Remember how you had to constantly adjust the brightness on old analog
scopes to see a desired level of detail in a signal, or to see the signal at all?
With the HP 54645A/D, this is not necessary. The HP 54645A/D brightness
knob operates much like the brightness knob on your computer screen, so
you should set it to a level that makes for comfortable viewing, given the
room lighting, and leave it there. Then you can control the “detail” by
selecting a Display Mode: Normal, Peak Detect, or Average, as described in
the following paragraphs. 

Normal Mode

Normal mode is the display mode that you will probably use for acquired
samples most of the time. It compresses up to 1 million acquisition points per
channel into a 4,000-point display record with vectors off, or a 2,000-point
record with vectors on.

The scope’s 200 MSa/s sampling speed specification means that samples are
taken every 5 ns. At the faster sweep speeds, the running display is built from
many individual triggers. If you press the Stop key, and pan and zoom
through the waveform, only the last trigger’s acquisition will be displayed.

Whether the scope is stopped or running, you see more detail as you zoom in,
and less as you zoom out. To keep from losing detail as you zoom out, switch
to the Peak Detect display mode. “Zoom” means you expand the waveform
using either the main or delayed sweep window. “Panning” the waveform
means you use the Delay knob to move it horizontally.

Peak Detect Mode

In Peak Detect display mode, any noise, peak, or signal wider than 5 ns will
be displayed, regardless of sweep speed. In Normal display mode, at faster
than 2 us/div, you would see a 5-ns peak, so peak detect has no effect at
sweep speeds faster than 2 us/div. Note that in this case the Pk status
indicator on the top line of the display is not highlighted.

Using Peak Detect and Autostore together is a powerful way to find spurious
signals and glitches. 

Average Mode

Averaging is a way to pull the signal out of noise. Averaging works better than
either a bandwidth limit or a brightness control because the bandwidth is not
reduced. 

Front-Panel Overview

Important Oscilloscope Considerations

2-3

Содержание 54645A

Страница 1: ...ble You will find any other available product information on the Agilent Test Measurement website www tm agilent com HP References in this Manual This manual may contain references to HP or Hewlett Packard Please note that Hewlett Packard s former test and measurement semiconductor products and chemical analysis businesses are now part of Agilent Technologies We have made no changes to this manual...

Страница 2: ... December 1997 pdf version Nov 1998 For Safety Information Warranties and Regulatory information see the pages behind the Index Copyright Hewlett Packard Company 1996 1997 All Rights Reserved HP 54645A Oscilloscope and HP 54645D Mixed Signal Oscilloscope ...

Страница 3: ...t of interest Delayed mode and delay allow zooming in to show a portion of waveform in detail split screen Storage Keys begin and end data acquisition Run Stop starts and stops continuous acquisitions Single performs one acquisition Autostore accumulates and displays the results of multiple acquisitions Erase clears the current acquisition and all accumulated data Trigger Keys define what data the...

Страница 4: ...n the bleeder tab titles to the right Front Panel Overview 2 Triggering HP 54645A D Oscilloscopes 3 MegaZoom Concepts and Oscilloscope Operation 4 Making Measurements with HP 54645A D Oscilloscopes 5 Using Option 005 Enhanced TV Video Trigger 6 Testing Adjusting and Troubleshooting 7 Replacement Parts 8 Getting Started 1 Performance Characteristics 9 Messages 10 Glossary Index iii ...

Страница 5: ...iv ...

Страница 6: ...oscope channels to view a signal 2 17 To use digital channels to view a signal 2 18 To display signals automatically using Autoscale 2 19 To apply the default factory configuration 2 20 To adjust oscilloscope vertical scaling 2 21 To turn analog channels on and off 2 24 To rearrange the analog channels 2 24 To turn digital channels on and off HP 54645D 2 25 To rearrange the digital channels HP 546...

Страница 7: ...o use TV triggering 3 10 Triggering the HP 54645D Mixed Signal Oscilloscope 3 11 Trigger types 3 12 To define an edge trigger 3 16 To use line triggering 3 16 To define a pattern trigger 3 17 To use glitch triggering 3 18 To define an advanced pattern trigger 3 19 4 MegaZoom Concepts and Oscilloscope Operation MegaZoom Concepts 4 3 Deep Memory 4 4 Oscilloscope Responsiveness 4 5 Display Update Rat...

Страница 8: ... front panel setups 4 48 To reset the HP 54645A D instrument setup 4 48 Configuring the Mixed Signal Oscilloscope 4 51 To change the logic threshold for input signals 4 51 Using Labels on the Mixed Signal Oscilloscope 4 53 To turn the label display on or off 4 53 To assign a predefined label to a channel 4 54 To define a new label 4 56 To initialize the label list 4 58 5 Making Measurements with H...

Страница 9: ...f the video signal 6 8 To trigger on all fields of the video signal 6 9 To trigger on odd or even fields 6 10 To analyze video waveforms with Option 005 6 12 7 Testing Adjusting and Troubleshooting Testing Adjusting and Troubleshooting 7 2 Solving Problems with HP 54645A D Oscilloscopes 7 3 If there is no trace display 7 4 If the trace display is unusual or unexpected 7 5 If you can t see a channe...

Страница 10: ... frequency compensation 7 35 To adjust the high frequency pulse response 7 36 To adjust the display 7 38 To adjust the Option 005 offset R15 HP 54645A 7 40 Troubleshooting the Oscilloscope 7 41 To construct your own dummy load 7 42 To check out the oscilloscope 7 43 To clear error messages 7 46 To check the Low Voltage Power Supply 7 48 To run the internal self tests 7 50 To troubleshoot Option 00...

Страница 11: ...oscope Digitizing System 9 5 HP 54645D Logic Digitizing System 9 5 HP 54645A D Time Base 9 6 HP 54645A D Oscilloscope Trigger System 9 7 HP 54645A Oscilloscope Trigger System 9 8 HP 54645D Mixed Signal Oscilloscope Trigger System 9 8 HP 54645A D Setup Functions 9 9 HP 54645A D Power Requirements 9 9 HP 54645A D General Characteristics 9 10 Option 005 General Performance Characteristics 9 11 Option...

Страница 12: ...1 Getting Started ...

Страница 13: ...e the trigger to reference the waveform data to a specific event of interest Use the oscilloscope to acquire data either in continuous or single shot fashion Examine the data and make measurements on it using various features Save the measurement or configuration for later re use or comparison with other measurements Repeat the process as necessary until you verify correct operation or find the so...

Страница 14: ...ics of these signals to help refine the trigger specification See figure 1 2 below For more information on triggering data acquisition data examination and measurement and configuration see chapters 3 and 4 Using the HP 54645A D Oscilloscopes and Refining the Trigger Specification Figure 1 1 Figure 1 2 Getting Started 1 3 ...

Страница 15: ...o the following tasks After you have completed them you will be ready to use the oscilloscope In the following topics you will Check package contents Adjust the handle Connect the cables Power on the oscilloscope Use the digital probes to probe a circuit with HP 54645D Use the oscilloscope probes Adjust display brightness 1 4 ...

Страница 16: ...P 54645A D Programmer s Guide HP 54645A D Programmer s Reference 3 5 diskette disk is packaged with Programmer s Guide 1252 7310 Banana ground plug for HP 54645D HP 54650A HP IB Interface Module HP 54652B RS 232 Parallel Interface Module HP 54654A Operator s Training Kit HP 54657A Meas Storage Module HP IB HP 54659B RS 232 Parallel Meas Storage Module HP 34810B BenchLink Software for Windows HP 50...

Страница 17: ...Items Supplied with the HP 54645A D Oscilloscopes Figure 1 3 Getting Started Check package contents 1 6 ...

Страница 18: ...Optional Accessories for the HP 54645A D Oscilloscopes Figure 1 4 Getting Started Check package contents 1 7 ...

Страница 19: ...200 79 200 Mint Gray Coco Brown Opt 906 Switzerland 250V 8120 2104 Straight SEV1011 79 200 Mint Gray Opt 912 Denmark 220V 8120 2957 Straight DHCK107 79 200 Mint Gray Opt 917 Africa 250V 8120 4600 Straight SABS164 79 200 Jade Gray Opt 918 Japan 100V 8120 4753 Straight Miti 90 230 Dark Gray Part number shown for plug is industry identifier for plug only Number shown for cable is HP part number for c...

Страница 20: ...loscope probe cables to oscilloscope analog channels A1 and A2 Connect the digital probe cable to oscilloscope digital channels D0 D15 4 Then connect the scope and or digital probes to the circuit of interest Be sure to connect the ground leads You can use the front panel calibration point as a stimulus while learning to use the oscilloscope 1 Grasp the handle pivot points on each side of the inst...

Страница 21: ...oltages in the range 100 to 240 VAC Therefore you do not need to adjust the input line voltage setting The line cord provided is matched by HP to the country of origin Ensure that you have the correct line cord See table 1 1 2 Press the power switch The HP 54645A D performs a self test then shows the display The instrument is ready to use Getting Started Power on the oscilloscope 1 10 ...

Страница 22: ... digital probe cable to HP 54645D The digital probe cable is indexed so you can connect it only one way You do not need to power off the HP 54645A D 3 Connect a grabber to one of the probe leads Be sure to connect the ground lead Other probe leads are omitted from the figure for clarity 4 Connect the grabber to a node in the circuit you want to test 5 For high speed signals connect a ground lead t...

Страница 23: ...until you have connected all points of interest 8 If you need to remove a probe lead from the cable insert a paper clip or other small pointed object into the side of the cable assembly and push to release the latch while pulling out the probe lead Replacement parts are available See the Replacement Parts chapter for details Getting Started Using the digital probes to probe a circuit 1 12 ...

Страница 24: ... the circuit point of interest Be sure to connect the ground lead to a ground point Adjust display brightness The brightness control is at the lower left corner of the display To decrease display brightness rotate the brightness control counter clockwise To increase display brightness rotate the brightness control clockwise HP 54645A D Brightness Control Figure 1 5 Getting Started Using the oscill...

Страница 25: ...1 14 ...

Страница 26: ...2 Front Panel Overview ...

Страница 27: ...m Throughout this book the front panel keys are denoted by a box around the name of the key and softkeys are denoted by a change in the text type For example Display is the grey front panel key on the front panel and Normal is a softkey appearing at the bottom of the display directly above its corresponding softkey Important Oscilloscope Considerations IMPORTANT Read This Information It is extreme...

Страница 28: ... many individual triggers If you press the Stop key and pan and zoom through the waveform only the last trigger s acquisition will be displayed Whether the scope is stopped or running you see more detail as you zoom in and less as you zoom out To keep from losing detail as you zoom out switch to the Peak Detect display mode Zoom means you expand the waveform using either the main or delayed sweep ...

Страница 29: ... known signal use Auto Single mode If a trigger exists it will be used if a trigger does not exist an untriggered or auto triggered acquisition will be taken for later analysis Using Vectors One of the most fundamental choices you must make about your display is whether to draw vectors connect the dots between the samples or simply let the samples fill in the waveform To some degree this is a matt...

Страница 30: ...isition you can do all of the measurements and math functions after the acquisition Measurements and math functions will be recalculated as you pan and zoom and turn on and off channels As you zoom in and out on a signal you affect the resolution of the display Because measurements and math functions are performed on displayed data you affect the resolution of functions and measurements The two sc...

Страница 31: ...loscope Front Panel Trigger Keys Display Storage Keys Softkeys Brightness Control Power Trigger Input Channel Inputs Controls Measurement Keys Horizontal Controls Calibration Output Figure 2 1 Front Panel Overview HP 54645A D Front Panels 2 6 ...

Страница 32: ... Trigger Keys Display Storage Keys Softkeys Brightness Control Power Analog Channel Inputs Controls Measurement Keys Horizontal Controls Digital Channel Inputs Controls Calibration Output Figure 2 2 Front Panel Overview HP 54645A D Front Panels 2 7 ...

Страница 33: ... channels and turn them on or off set coupling inversion and probe factors and connect the acquisition system to the probes Volts Div Position Channel 1 Volts Div Position Channel 2 STORAGE Keys Control start and stop of acquisition single trace persistent acquisition and screen erasure HORIZONTAL Controls Adjust the time base horizontal mode and main and delayed sweep functions Delay Time Div TRI...

Страница 34: ...d inversion and connect the acquisition system to the probes Volts Div Position Channel A1 Volts Div Position Channel A2 STORAGE Keys Control start and stop of acquisition single trace persistent acquisition and screen erasure HORIZONTAL Controls Adjust the time base horizontal mode and main and delayed sweep functions Delay Time Div TRIGGER Controls Set up trigger mode and trigger conditions Anal...

Страница 35: ...ou can scroll through the choices by pressing the softkey repeatedly or by using the Entry knob For some softkeys you can use the Entry knob to scroll through the choices For channel lists you can always use the Select knob or Entry knob to scroll through the choices Occasionally a softkey label is displayed with two or more choices below it one of which is highlighted The highlighted choice is th...

Страница 36: ...has no function in the selected menu HP 54645A D Control Knobs Control knobs on the HP 54645A D front panels include the following The Time Div knob changes the current time base setting sweep speed of the oscilloscope in Main or Delayed sweep The setting of the time base affects sample rate and other instrument functions as well This control knob allows you to zoom the waveform when the acquisiti...

Страница 37: ...lloscope from triggering for a specified amount of time HP 54645D The display intensity knob adjusts display brightness HP 54645A D Display Regions The display is divided into the following regions Activity status indicators are along the top of the display These include channel status when selecting the Pattern and Advanced trigger menus and show whether digital channels are turned on or off HP 5...

Страница 38: ...ent in both the main and delayed sweep it moves with the Delay knob The symbol indicates the time reference point The time reference indicator is a left arrow if the trigger event is at the beginning of acquisition memory a right arrow if the event is at the end of acquisition memory and a down arrow if it is at the center The offset markers and delay measurement work together when you adjust the ...

Страница 39: ...ed HP 54645A D The acquisition indicator shows the current acquisition condition that is whether the acquisition system is running stopped or in Autostore mode HP 54645A D When the instrument is in Normal trigger mode the Trigger condition indicators flash while the instrument is searching for the trigger condition which occurs after the pre trigger buffer is full When the instrument is in Auto tr...

Страница 40: ...nnel labels to help you remember the function of each channel in your circuit or disable the labels to increase the waveform display area HP 54645D only Analog channel voltage levels Voltages for channels 1 and 2 analog channels 1 and 2 on HP 54645D are set to 100 mV by default and range from 1 0 mV to 5 0 V HP 54645A D Front Panel Overview Description of Front Panel Areas 2 15 ...

Страница 41: ...d HP 54645D Channels Because both the HP 54645A Oscilloscope and the HP 54645D Mixed Signal Oscilloscope have analog channels the analog channel topics in this chapter apply to both instruments Whenever a topic discusses the digital channels that information applies only to the HP 54645D Mixed Signal Oscilloscope Oscilloscope Channels are Labeled Differently On the HP 54645A Oscilloscope the analo...

Страница 42: ... Default Setup Example Connect the oscilloscope probes for channels 1 and 2 for HP 54645A or A1 and A2 for HP 54645D to the calibrator output on the front panel of the instrument Set the instrument to the factory default configuration by pressing Setup then Default Setup Then press Autoscale You should see a display similar to the following HP 54645D Sample Autoscale Measurement Figure 2 3 Front P...

Страница 43: ...Example Install grabbers on channels D0 and D1 Connect the probes for digital channels D0 and D1 to the calibrator output on the front panel of the instrument Be sure to connect the ground lead Set the instrument to the factory default configuration by pressing Setup then Default Setup Then press Autoscale You should see a display similar to the following HP 54645D Sample Autoscale Measurement Fig...

Страница 44: ... 54645A D scope channels The scope channels that are on are scaled vertically to best fit the screen For testing for digital channel activity TTL ECL and variable thresholds are used in that order Digital channels not previously displayed will be added below those channels already displayed with the lowest numbered channel at the top Higher numbered channels will be displayed in order down the dis...

Страница 45: ... trigger to a rising edge on a channel checking the channels in this priority A2 A1 D15 D0 Undo Autoscale The Undo Autoscale function returns the instrument to the setup that existed prior to Autoscale being activated To apply the default factory configuration To set the instrument to the default factory measurement configuration press Setup then press Default Setup The default configuration retur...

Страница 46: ... measure the DC component of the signal by simply noting its distance from the ground symbol If the channel is AC coupled the DC component of the signal is removed allowing you to use greater sensitivity to display the AC component of the signal 2 Change the vertical setup and notice that each change affects the status line differently You can quickly determine the vertical setup from the status l...

Страница 47: ...hannel off either press 1 for HP 54645A or A1 for HP 54645D a second time or press the left most softkey Invert Operating Hint Inversion affects how a channel is displayed but it does not affect triggering The trigger does not see the inversion and thus is not affected If the trigger is set to a rising edge it remains rising after inversion Bandwidth Limit The displayed bandwidth limit of the sele...

Страница 48: ...Config and Expand Vertical Ground When you increase the Volts Div to expand the signal about ground the bottom of the waveform stays at the same level while the top of the waveform adjusts to fill the Volts Div setting Oscilloscope Probes The HP 54645A D Oscilloscopes have automatic probe sensing If you are using the probes supplied with the oscilloscope or other probes with probe sensing the prob...

Страница 49: ...is highlighted If you are already accessing the channel menu you can press the On Off key or the channel key 1 or 2 for HP 54645A A1 or A2 for HP 54645D to toggle a particular channel on or off To rearrange the analog channels Rotate the channel 1 or 2 Position knob to choose a new location for the analog channel Turning the Position knob counter clockwise moves the channel down turning the knob c...

Страница 50: ... D0 D15 again to turn on the channel You can assign labels to channels that are off or use them in a trigger specification The two analog channels are always acquired so you can turn them on and look at them even if they were off during the acquisition The combination of events and displayed channels are Running Before Acquisition After Stopping Acquisition D0 D7 D8 D15 D0 D7 D8 D15 Off Off Can be...

Страница 51: ... you can only move the waveform to certain discrete locations 3 To change the general order in which channels are displayed press D0 D15 Then press the Off On softkey or the Reorder D15 D0 softkey When Reorder D15 D0 is pressed the digital channels are displayed in descending order and the Reorder softkey is relabeled D0 D15 When the D0 D15 softkey is pressed the digital channels are displayed in ...

Страница 52: ...elayed key when the instrument is running during a single run or when the instrument is stopped The sample rate is also displayed when the acquisition stops or ends Turn the Delay knob and notice that its value is displayed in the status line The Delay knob moves the main sweep horizontally and it pauses at 0 00 s mimicking a mechanical detent At the top and bottom of the graticule is a solid tria...

Страница 53: ...op key To begin a single acquisition press the Single key The instrument begins acquiring data while searching for a trigger condition The RUN indicator is shown in the upper right corner of the display If a trigger occurs the acquired data is shown in the display To stop an acquisition in process press the Run Stop key The instrument stops acquiring data and the STOP indicator is shown in the upp...

Страница 54: ...litch time and setup memory number It also moves the selected cursor when cursors are on In menus where it doesn t need to do these things for example there is no field to increment or decrement or cursors are turned off it adjusts the selected channel increment decrement in a non screen but numerical order The Entry knob also occasionally duplicates the function of the Select knob Use the Entry k...

Страница 55: ...can select f1 or f2 for the source Active Cursor includes voltage cursors V1 and V2 and time cursors t1 and t2 Pressing the voltage cursors alternates between V1 or V2 or both V1 and V2 Pressing the time cursors alternates between t1 or t2 or both t1 and t2 When both voltage cursors or both time cursors are highlighted they are selected and they will move together on the screen Voltage cursors do ...

Страница 56: ...positions in relative number of degrees For the voltage cursor readout you can select Volts or When Active Cursor is V1 V2 the Readout Volts softkey sets the display to show the cursor positions in volts when Volts is highlighted and as a percentage when is highlighted You can expand the display with delayed sweep then characterize the event of interest with the cursors Pressing the Active Cursor ...

Страница 57: ...yed sweeps are displayed there are half as many vertical divisions so the vertical scaling is doubled Notice the changes in the status line The top half also has two solid vertical lines called markers These markers show what portion of the main sweep is expanded in the lower half The size and position of the delayed sweep are controlled by the Time Div and Delay knobs The Time Div next to the sym...

Страница 58: ...ated by longer hash marks Full has a set of hash marks through the center of the waveform display area with major divisions indicated by a full height dotted line through the waveform display None has only a border around the waveform display area Each major division in the graticule corresponds to the time given by the Time Div setting shown to the right of the delay value on the display Front Pa...

Страница 59: ...e HP IB HP 54659B Measurement Storage Module RS 232 Parallel 1 If you have one of these modules installed configure the module first If necessary refer to documentation supplied with the module 2 Press Print Utility 3 Press Print Screen The current display is copied to the attached printer You can stop printing by pressing the Cancel Print softkey See the documentation for the interface module for...

Страница 60: ...3 Triggering HP 54645A D Oscilloscopes ...

Страница 61: ...frequency and noise rejection see chapter 5 Holdoff and Trigger Level Slope Edge Triggering This chapter explains how to do all these things and more If you are not familiar with basic operations see chapter 1 Getting Started See also Triggering the HP 54645D Mixed Signal Oscilloscope in this chapter for additional triggering functionality Glitch Trigger In digital system design a glitch is an uni...

Страница 62: ...an low repetitive rate signals To display a dc signal you must use the auto trigger mode since there are no edges on which to trigger Auto Lvl mode is the same as Auto mode with an automatic trigger level adjustment The oscilloscope looks at the signal level on the signals and if the trigger level is out of range with respect to the signal the scope adjusts the trigger level back to the middle of ...

Страница 63: ...e trigger condition indicator on the status line to indicate it is doing so While searching for the trigger the oscilloscope overflows the pre trigger buffer the first data put into the buffer is the first pushed out FIFO In either Auto or Normal mode the trigger may be missed completely under certain conditions This is because the oscilloscope will not recognize a trigger event until the pre trig...

Страница 64: ...e a unique trigger point This action works even though many waveform periods pass between triggers because the holdoff circuit operates on the input signal continuously The HP 54645A D uses digital holdoff independent of time base settings The advantage of digital holdoff is that it is a fixed number As a result changing the time base settings does not affect the holdoff number so the oscilloscope...

Страница 65: ...at is associated with the waveform If there is no sync pulse use these steps to trigger on a periodic complex waveform 1 Connect a signal to the oscilloscope 2 Set the trigger level to the middle of the waveform 3 Adjust the Holdoff knob to synchronize the trigger of the oscilloscope with the complex waveform Triggering HP 54645A D Oscilloscopes To trigger on a complex waveform 3 6 ...

Страница 66: ...nly available on the HP 54645A Oscilloscope 1 Connect a signal to the BNC labeled External Trigger The external trigger input has an input impedance of 1 MΩ and can accept a maximum signal of 400 V dc peak ac with a range of 18 V You can connect the trigger output of other instruments to this external trigger input or use an oscilloscope probe such as the HP 10074A 2 Press Slope Glitch Then select...

Страница 67: ...t the Line trigger source when Glitch trigger mode is selected 3 Press Slope Glitch to set the trigger condition 4 Select either the rising edge or falling edge softkey to choose whether the trigger will occur on the rising or falling edge of the input signal HP 54645A Triggered on Rising Edge of Channel 2 Figure 3 2 Triggering HP 54645A D Oscilloscopes To trigger on an edge 3 8 ...

Страница 68: ...Glitch Then select Glitch 2 Select Glitch Menu 3 Define the polarity duration qualifier and duration time for the glitch HP 54645A Triggered on Glitch on Channel 1 Figure 3 3 Triggering HP 54645A D Oscilloscopes To use glitch triggering 3 9 ...

Страница 69: ...larity 5 Select the TV mode Pressing Field 1 triggers on the video signal field 1 portion odd fields Pressing Field 2 triggers on the video signal field 2 portion even fields Pressing Line triggers on the start of the first line that occurs after the scope starts Pressing Vertical provides vertical triggering at the beginning of both Field 1 and Field 2 Triggering HP 54645A D Oscilloscopes To use ...

Страница 70: ... want to capture The triggering modes include Auto Lvl Auto and Normal Advanced triggering consists of Glitch Advanced Pattern and TV Depending on the trigger selections and conditions you can use analog channels A1 or A2 Line or D0 D15 for the trigger source MegaZoom Technology Simplifies Triggering With the built in MegaZoom technology you can simply Autoscale the waveforms then stop the scope t...

Страница 71: ...th the desired trigger type Edge Trigger In edge trigger you define a single rising or falling edge that must be recognized on any input channel to satisfy the trigger condition Edge trigger is best when there is a unique waveform edge that defines the events you want to capture For example a pulse that defines the beginning of a pulse train on another channel will often make a good edge trigger E...

Страница 72: ...ame pattern occurs many times and most of those occurrences have little to do with the events you want to capture For example suppose that this same state machine generates hundreds of states and the state C occurs several times in the sequence with a different sequence of states after each occurrence A pattern trigger will not provide a stable waveform display The pattern trigger occurs when the ...

Страница 73: ...omplete trigger specification Advanced pattern trigger is best when the events you want to capture are defined by a series of waveform events in the system and neither pattern mode nor edge mode are capable of clearly resolving the necessary sequence For example suppose the events you want to capture are defined by a pattern with a certain minimum duration or by a pattern followed by another patte...

Страница 74: ...ls The TV trigger can be set to trigger on the vertical interval Field 1 Field 2 or Line In Line mode the oscilloscope will trigger on the start of the first line that occurs after the scope starts The advanced TV trigger requires two vertical divisions of display amplitude On HP 54645D you must specify either analog channel A1 or A2 as the trigger source You specify the polarity either positive o...

Страница 75: ...nel as the source after you have set the edge trigger condition and selected another menu continuously rotating the Select knob will not affect the channel used for the trigger condition The trigger edge is not changed until you select a slope This frees up the Select knob for other operations such as measurements To use line triggering This power line edge triggering when selected overrides any o...

Страница 76: ...the pattern If you define an edge term then select a different channel in the pattern and define another edge term the previous edge definition is changed to a don t care Source Definitions for Simple Pattern Trigger Affect Advanced Trigger The source definitions for the simple pattern trigger are shared with the Pattern 1 and Edge 1 source definitions of the advanced pattern trigger specification...

Страница 77: ...ftkey until the desired source is highlighted 4 Select positive or negative polarity for the glitch to capture 5 Select the time qualifier less than a specified width greater than a specified width or within minimum and maximum limits for the glitch and rotate the Entry knob or press the softkey to increase the duration time Triggering HP 54645A D Oscilloscopes To use glitch triggering 3 18 ...

Страница 78: ...rces with which they can be used The sources you specify later in this procedure can limit your choice of trigger operators and your choice of trigger operators can limit which sources are available For example the operator Exited applies only to Pattern 1 Not Pattern 1 Pattern 2 and Not Pattern 2 individually but not to all of them at once Table 3 1 Trigger Operators and Sources Operator of Sourc...

Страница 79: ...ftkey or rotate the Entry knob to set the duration Duration time When this operator is selected you have two choices for trigger Trigger At Timout default trigger when time criteria is met after you enter the pattern This is useful for conditions where the pattern occurs and you want to see the waveform but no edge follows immediately Trigger At Pat Exit trigger when you exit the pattern 8 To set ...

Страница 80: ... to a state matching that pattern In an edge term or a pattern and edge term the edge transition is where entered is defined Exited means that the trigger qualifier is satisfied when the input waveforms transition out of a state matching the pattern to a state not matching the pattern Advanced pattern trigger can help you solve difficult data acquisition problems When setting up an advanced trigge...

Страница 81: ... to setting up a useful waveform display is choosing a known sequence of waveform events to which you can apply the advanced trigger capabilities The HP MegaZoom technology greatly simplifies this task You simply press Stop then pan and zoom through the waveform to find a good trigger event To find these events you can also ask questions about the waveform keeping in mind the capabilities of the o...

Страница 82: ... 9 µs 4 1 µs Example Suppose you have a state machine whose three outputs Q0 through Q2 output the decimal sequence 0 1 6 0 6 1 Q2 is the most significant bit as shown in the following figure Sequential Output from State Machine If you try to trigger on any of the single output patterns 0 1 or 6 the display will not be stable However you can use the Then operator to trigger on the sequence of patt...

Страница 83: ...rn trigger specification will affect the definitions of Pattern 1 and Edge 1 High Frequency Pattern Reject When you set a pattern that contains more than one digital channel and no edges or analog channels it is possible that false patterns may occur when two digital channels change at the same time due to minor skew differences In the previous example when Q2 Q0 change from 1 to 6 Q2 and Q1 rise ...

Страница 84: ...4 MegaZoom Concepts and Oscilloscope Operation ...

Страница 85: ...e time base setting and other time dependent oscilloscope functions explains how to achieve the most accurate signal fidelity through good probing practices and describes how glitch detection works Oscilloscopes with HP s MegaZoom Technology The information in this chapter applies to both the HP 54645A and HP 54645D Oscilloscope models because both are based on HP s MegaZoom technology 4 2 ...

Страница 86: ...data path between the scope probe and the scope display This yields an instrument that responds instantly to pan and zoom controls while exploring the acquired data MegaZoom technology combines update rate instant control response and deep memory innovations to allow you to capture long time periods with high sample rates and instantly zoom in on the signal details of interest either while stopped...

Страница 87: ...e signal fidelity of the interrupt edge and also long time capture to determine how long the interrupt line was asserted Another advantage is the ability to capture relatively longer periods of time or slow time per division settings at an adequate sample rate This allows you to capture a long event such as an oscillator starting up or two events separated by a long time such that you can see the ...

Страница 88: ...gy In MegaZoom technology the primary task of processing acquisition memory into scope waveforms using proprietary display techniques is distributed to waveform translator hardware The processor s primary responsibility is to scan the keyboard and manage I O ports Because the dedicated waveform translator can draw waveforms quickly as opposed to a general purpose processor the other processor is d...

Страница 89: ...assume that their scope is capturing the entire waveform and that the update rate is perfect when the scope display is actually missing some waveforms MegaZoom technology maintains high update rate by using parallel processing and memory segmentation The MegaZoom oscilloscope flows samples into one area of acquisition memory and in another area they are read out and processed into displayed sample...

Страница 90: ...storing the samples at a 1 MSa s rate In this case the scope can only store one out of every 200 samples In a traditional digital scope system HP uses a simple sample rate decimation algorithm store the first sample ignore 199 store a sample ignore 199 etc In dithered systems HP 54600 family scopes HP uses a powerful anti aliasing display technique one sample is chosen randomly from the first 200 ...

Страница 91: ... displayed in these cases some points will not be displayed This can present a problem if you are interested in capturing a narrow event relative to the time window of interest Keep in mind that this narrow pulse may not be displayed through it has been captured because of the sample compression Consider the following example In this example we are attempting to capture a pulse with a width of 50 ...

Страница 92: ...the acquired samples to the displayed samples increases For example at 2 µs div 20 µs div across the screen we now display every sample acquired in that time window 20 µs 5 ns 4 000 samples By zooming in to this range we can see the pulse of interest Zooming the Waveform to View Narrow Pulse Figure 4 1 Figure 4 2 MegaZoom Concepts Display Modes 4 9 ...

Страница 93: ... ns will be displayed regardless of the Time Div setting In Normal display mode at faster than 2 µs div you would see a 5 ns peak so Peak Detect has no effect at faster than 2 µs div Note that the Pk status indicator is not highlighted in this case Consider our previous example with the scope now in peak detect display mode The narrow pulse would always be displayed because the narrow pulse sample...

Страница 94: ...al transitions that occur between logic samples Because of the high sample rate of the HP 54645A D MegaZoom technology you should not see aliasing Consider the following example The following picture shows a simple square wave with the scope in peak detect mode at 1 µs div Simple Square Wave in Peak Detect Mode on HP 54600 Figure 4 3 MegaZoom Concepts Display Modes 4 11 ...

Страница 95: ...of the lack of any intermediate signal values Same Square Wave in Peak Detect Mode at 200 µs div on HP 54600 The HP 54645A D goes one step further in peak detect mode In addition to the maximum and minimum values the HP 54645A D includes some normal or dithered samples Note the same picture at 200 µs div on the HP 54645A D as shown above Figure 4 4 MegaZoom Concepts Display Modes 4 12 ...

Страница 96: ...n change display modes after you acquire data You can switch from peak detect to normal display mode If you acquire data in normal mode then switch to peak detect you will see all the peaks in memory However you are not guaranteed to see every 5 ns peak This allows you to view the data differently without having to re acquire the information Using Peak Detect and Autostore Peak Detect includes bot...

Страница 97: ... differently The scope considers a glitch to be any set of two or more edges that pass through the logic threshold and fall between logic samples Digital channels are not affected by the peak detect display mode Digital channels will always display glitches multiple logic transitions between logic samples as shown in the following figure HP 54645D Shows Glitches Note that the glitches are indicate...

Страница 98: ...splay mode at sweep speeds faster than 2 µs div you see all the 5 ns samples and thus peak detect has no effect The same is true of smoothing It will have no effect at sweep speeds of 2 µs div and faster Note that the Av status indicator is not highlighted Averaging 4 8 16 32 64 128 256 lets you average multiple triggers together to reduce even more noise than can be achieved on the scope display ...

Страница 99: ...rs on and off or switch from peak detect to normal display modes If you acquire data in normal mode then switch to peak detect you will see all the peaks in memory You are not guaranteed however of seeing every 5 ns peak Digital channels on the HP 54645D are not affected by the display menu They are always displayed with peak detect and vectors on They also only contain one trigger worth of inform...

Страница 100: ... off but you cannot make measurements on them If you are using cursors to make measurements manually be sure you have the correct channel selected it is easy to mistakenly measure the peak voltage of channel 1 with the Volts Div and Position of channel 2 The combination of events and displayed digital channels is described in the topic To turn digital channels on and off HP 54645D in chapter 2 Meg...

Страница 101: ...he signal details after acquiring them by panning and zooming through the waveform There is no limit imposed on the zoom ratio between the sweep speed used to acquire the data and the sweep speed used to view the data There is however a useful limit This useful limit is somewhat a function of the signal you are analyzing In normal or average display mode with vectors connect the dots off you can z...

Страница 102: ... figure Resolution Limit in Peak Detect with Vectors On In the display the boxes indicate the peak detect uncertainty Horizontally the box indicates the time over which peak detect searched for minimum and maximum values Vertically the box indicates the maximum and minimum value These boxes apply to both digital channels on the HP 54645D and analog channels on the HP 54645A D These boxes also indi...

Страница 103: ...ate both the time over which the max and min values were searched line length and the max and min values line position the upper line corresponds to the lower line in the same set of pixels The normal points in the display show individual samples also acquired at the same time Horizontal lines indicate the search time line length and max and min values line position max value min value max value m...

Страница 104: ... these two cases you are still allowed to pan and zoom the waveform in acquisition memory However as you first pan or zoom you may see your scope picture change to reflect the fact that only one trigger of acquired data is available on which to pan and zoom You can re display the original stopped screen by pressing Setup and Recover Screen At very slow sweep speeds of 200 ms div and greater if you...

Страница 105: ...an 0 To set the time reference so that the acquired data is centered around the trigger press Center The time reference indicator will be at the middle of the display The trigger event will be at the same location unless the delay is set to a value other than 0 To set the time reference so that most of the acquired data precedes the trigger press Right The time reference indicator will be one divi...

Страница 106: ... Delayed the delay controls the position of the delayed sweep window inside the main sweep display This delayed delay value is independent of sampling interval and sweep speed The time reference indicates where the delay value is on the screen and is the point about which the screen is expanded when you change the time per division The delay setting sets the specific location of the trigger event ...

Страница 107: ...asurement we have the time reference set to Center the sweep speed set to 5 µs div and the positive delay set to 30 µs Setting a positive delay lets us look at the part of the signal that is to the right of the trigger point When a single acquisition is performed the result resembles Single Acquisition Time Reference Center Positive Delay The trigger event is off the screen to the left Center scre...

Страница 108: ...elationship between the trigger point and relative locations in acquisition memory If you start a new acquisition after stopping and panning the delay value to which you panned will be used in determining the trigger location for the new acquisition For example if you acquire data with a delay value of 100 µs then stop and pan the display to 50 µs the new acquisition will position the trigger 50 µ...

Страница 109: ... sweep speed of 5 µs and a delay value of 30 µs When we perform a single acquisition the display resembles Single Acquisition Time Reference Right Negative Delay The trigger event is off the screen to the right Center screen shows part of the signal to the left of the trigger Figure 4 11 MegaZoom Concepts Changing the time reference position 4 26 ...

Страница 110: ...n you vary the Time Div setting during Run mode remember that the sample period may also be adjusted If for example you rapidly change the Time Div setting to a higher value slower sweep speed the sample period is also lengthened and it will take longer to fill acquisition memory The previous acquisition is first redrawn on the screen at the new Time Div setting before starting a new acquisition T...

Страница 111: ...the waveform change the delay you can look at the spectrum as a function of time As you zoom in on the signal the effective sample rate increases and the frequency span increases the resolution decreases As you zoom out the effective sample rate decreases and the frequency span decreases the resolution increases One of the benefits of the HP 54645A D is that you can change display modes after you ...

Страница 112: ...ge to the logic threshold If the voltage is above the threshold the oscilloscope stores a 1 in sample memory otherwise it stores a 0 To control the HP 54645A D acquisition process you can do the following Perform continuous acquisitions by pressing the Run Stop key and stop the acquisitions by pressing Run Stop again Take exactly one acquisition then stop by pressing the Single key Store the resul...

Страница 113: ...speeds the scope will have a greater sample rate When running then pressing Stop the oscilloscope simply stops and several triggers of information could be displayed on the screen This will happen in several cases At very fast sweep speeds 2 µs div and faster you might see less than a full screen of data per trigger In this case we build a picture from several triggers Doing this provides a more a...

Страница 114: ...lf This allows the acquisition system to acquire one record while processing the next acquisition dramatically improving the number of waveforms per second processed by the scope While running maximizing the rate at which waveforms are drawn on the display provides the best picture of your input signal At fast sweep speeds not all of the acquired points fit on the screen Numerically 500 000 points...

Страница 115: ...sequent pan and zoom explorations To address this shortcoming when the Stop key is pressed the scope reconfigures itself to take one last acquisition using all of the available memory 500 000 points if another trigger is found If indeed one more trigger is found within a short period of time 100 ms the scope can use the longer record for pan zoom If a trigger is not found the shorter record must b...

Страница 116: ...eform display area will show nothing To take a single trace Press Single The oscilloscope starts the acquisition system and begins searching for the trigger condition When the oscilloscope is in Autostore mode see To use Autostore pressing Single adds the results of the new acquisition to the current display contents Auto Single Auto trigger will generate a trigger for you if one is not found in t...

Страница 117: ...4645A set up the trigger a Press Source Select a trigger source b Press Mode Coupling Set Trigger Mode to Normal c Turn the trigger Level knob to the trigger threshold where you think the trigger should work 3 For HP 54645D set up the trigger a Define an edge pattern or advanced trigger b Press Mode Coupling Set Trigger Mode to Normal c If you are using the analog channels to capture the event tur...

Страница 118: ...he oscilloscope will wait for a valid trigger If no trigger is found after about 40 ms the oscilloscope will force a trigger acquiring whatever signal is present This is a handy mode to look for totally unknown situations When Trigger mode set to Normal pressing will arm the trigger circuit and do a single acquisition when a valid trigger is seen You can use trace pixel memories to compare several...

Страница 119: ...splayed in half bright with the latest acquisition in full bright Autostore is useful in a number of applications including these Display the worst case extremes of varying waveforms Capture and store waveforms Measure noise and jitter Capture events that occur infrequently The Store indicator is displayed at the right end of the status line when Autostore is selected To Autostore Multiple Events ...

Страница 120: ...ent to run 2 Press Single to take a single autostored acquisition After the single acquisition the scope will stop 3 You may want to press Erase to display a clean screen 4 Now pressing the Single key will result in an autostored single trigger Each single trigger will be added to the accumulated Autostore results on the screen Run Stop Single Autostore Erase Operation To Autostore Multiple Single...

Страница 121: ...splay will be quickly updated after the erasure Summary of Oscilloscope Storage Keys Run acquires data and displays the most recent trace Stop freezes the display Single acquires a single trace Autostore acquires data displaying the most recent trace in full bright and previously acquired waveforms in half bright Erase clears the display Run Stop Single Autostore Erase Operation To erase the wavef...

Страница 122: ...put impedance is generally specified in terms of a parallel capacitance and resistance The resistance is the sum of the tip resistor value and the input resistance of the test instrument see the following figure The capacitance is the series combination of the tip compensating capacitor and the cable plus instrument capacitance in parallel with the stray tip capacitance in parallel with the stray ...

Страница 123: ...oint on the impedance chart Impedance versus Frequency for Both Probe Circuit Models The HP 54645D logic probes are represented by the high frequency circuit model shown above They are designed to provide as much series tip resistance as possible Stray tip capacitance to ground is minimized by the proper mechanical design of the probe tip assembly This provides the maximum input impedance at high ...

Страница 124: ...oltage V When this voltage exceeds the threshold voltage defined in the oscilloscope a false data measurement will occur Sharing one probe ground with many probes forces all the current that flows into each probe to return through the same common ground inductance of the probe whose ground return is used The result is increased current di in the above equation and depending on the transition time ...

Страница 125: ...unsure how much margin is available in your measurement setup The following are guidelines for good probing practices The ground lead from each digital channel group 0 7 and 8 15 should be attached to the ground of the circuit under test if any channel within the group is being used for data capture When capturing data in a noisy environment every third digital channel probe s ground should be use...

Страница 126: ...are independent of the 10 regular setup memories The normal application for trace memory is quick comparison of measurement results For example you might make a measurement on a known good system save the result in trace memory then make the same measurement on a known bad system and recall trace memory to see the differences Add an Interface Module to Make Memory Non Volatile Trace memory is norm...

Страница 127: ...dependent label lists These memories are non volatile They are best used for saving instrument configurations that you need later to verify the results of a change or need regularly for test and troubleshooting Selects trace memory Selects whether the memory is on displayed or off Saves current waveform to the selected memory Erases the selected memory Sets the HP 54645A D to the configuration sav...

Страница 128: ...ncrease accuracy because preconfiguration minimizes the chance for error The current acquisition results are not saved in the setup memory To save acquisition results for later review and comparison use the trace memory The following figure shows the setup memory softkey menu on the HP 54645D Mixed Signal Oscilloscope Setup Memory Softkeys on HP 54645D Choose memory 1 10 with the Entry knob or sof...

Страница 129: ...N is the trace memory number Save to Mem N saves the displayed waveform to the selected trace memory Front panel setups are saved to separate memory locations Clear Mem N erases the selected trace memory Recall Mem N Setup recalls the front panel setup that was saved with the waveform If a Measurement Storage module is attached to the oscilloscope 100 non volatile trace memories are available Edit...

Страница 130: ...asurements use the cursors 7 If you changed the oscilloscope setup since you saved the display and setup to trace memory press the Recall Setup softkey Then use the cursors to make the measurements 8 To clear a trace memory press the Clear Mem N softkey Trace Memory Operating Hint The standard oscilloscope has volatile trace memories saved data will be lost when you turn the oscilloscope off Addin...

Страница 131: ...rn the Entry knob 3 Press the Save softkey to save a front panel setup then press the Recall softkey to recall a front panel setup To reset the HP 54645A D instrument setup 1 To reset the instrument to the default factory preset configuration press Setup 2 Press the Default Setup softkey 3 To reset the instrument to the configuration that was present before pressing Autoscale press the Undo Autosc...

Страница 132: ...to Full Autostore Off Time base Time reference center main not delayed sweep vernier off main and delay value 0 100 µs div main time base 500 ns div delayed time base sample rate is 200 MSa s Display Vectors On Display Mode Normal Channels Channel 1 on Position 0 V Volts Div 100 mV Trigger Mode Auto Level Coupling DC Reject Off Noise Reject Off Trigger Condition Rising edge of channel 1 Saving and...

Страница 133: ...500 ns div delayed time base Display Vectors On Display Mode Normal Channels Channel A1 on Position 0 V Volts Div 100 mV Labels Labels off Threshold TTL 1 4 V for all channels and external trigger input channel 0 7 threshold is selected when menu is entered Trigger Mode and Condition Normal Trigger Mode with edge trigger Coupling DC Reject Off Noise Reject Off Edge Trigger Rising edge on channel A...

Страница 134: ...e logic thresholds 3 Press the Set softkey to select a group of digital channels You can set thresholds for digital channels D0 D7 and D8 D15 4 Press the TTL CMOS or ECL softkey to choose a preset threshold 5 To set a different threshold press the softkey just to the right of the ECL softkey see the following figure Then vary the threshold voltage from 6 00 V to 6 00 V with the Entry knob 6 If you...

Страница 135: ...w or logic high The settings for each option are shown in the following table Table 4 3 Threshold Voltage Settings Option Voltage TTL 1 40 V CMOS 2 50 V ECL 1 30 V Variable Variable from 6 00 V to 6 00 V Variable threshold softkey Figure 4 19 Configuring the Mixed Signal Oscilloscope To change the logic threshold for input signals 4 52 ...

Страница 136: ...you can turn labels off to increase the waveform display area To turn the label display on or off To display channel labels press Label Threshold then press the Labels On softkey To turn off channel labels display press Label Threshold then press the Labels Off softkey You can press Label Threshold repeatedly to toggle the channel labels display 4 53 ...

Страница 137: ... If you have selected a predefined label and the copy buffer is empty pressing Assign again will assign the new label to the selected channel Label display is automatically enabled when you enter the Define Labels menu Thus if the labels were off they are turned on while you define labels If you exit the Define Labels menu and the labels were off before you entered the menu they are turned off whe...

Страница 138: ... copy the label or character to the entry field Press to insert a space in the entry field at the cursor Press to delete the character at the cursor in the entry field Shows what will be put in the entry field when you press Copy Press to assign the label to the channel Select the channel with the Select knob Scroll through the label and character lists using the Entry knob Figure 4 20 Using Label...

Страница 139: ...try of a new label When you initialize the label list all of your custom labels will be cleared and the label list will be returned to its factory configuration To define a new label 1 Press Label Threshold 2 Press the Define Labels softkey A label definition menu is shown on the right hand side of the display 3 To use an existing label as the basis for the new label use the Entry knob to choose a...

Страница 140: ... current character press the Delete Character softkey Delete Character deletes the character under the cursor and moves successive characters forward by one position 5 Press the Assign Label softkey The label is assigned to the selected channel Label display is automatically enabled when you enter the Define Labels menu Thus if the labels were off they are turned on while you define labels If you ...

Страница 141: ...Yes again to initiate the operation To cancel the operation press the No softkey When you first begin using the oscilloscope there are some blank entries at the beginning of the label list As you define custom labels these spaces are filled One blank space is always retained to allow entry of a new label When you initialize the label list all of your custom labels will be cleared Using Labels on t...

Страница 142: ...5 Making Measurements with HP 54645A D Oscilloscopes ...

Страница 143: ... determine the setup of the oscilloscope by looking at the status line We recommend you perform all of the following exercises so you become familiar with the powerful measurement capabilities of the oscilloscope Concepts about the HP 54645A D Oscilloscopes Conceptual information about the HP 54645A D Oscilloscopes is in the chapter MegaZoom Concepts and Oscilloscope Operation 5 2 ...

Страница 144: ...ope s delayed sweep is not a second acquisition but an expansion of the same data displayed in the main sweep MegaZoom technology makes this possible because of its deep memory Also because of the deep memory in MegaZoom technology it is possible to capture the main display at 1 ms div and redisplay the same trigger in the delayed display at 1 µs div a 1000 1 zoom ratio When you enable the delayed...

Страница 145: ...nnect a signal to the oscilloscope and obtain a stable display 2 Press Main Delayed 3 Press the Delayed softkey HP 54645D Showing Delayed Sweep Delayed sweep indicator time reference center Time Div for delayed sweep Time Div for main sweep These markers define the beginning and end of the delayed sweep window Select main or delayed sweep Set trigger position in acquisition memory Main sweep windo...

Страница 146: ...o the vertical scaling is doubled Notice the changes in the status line To display the delay value of the delayed time base temporarily at the bottom of the screen press Main Delayed To change the delay for the delayed sweep window turn the Delay knob To change the Time Div for the delayed sweep window turn the Time Div knob To change the Time Div for the main sweep window select the main sweep mo...

Страница 147: ...a signal that is not synchronous to the period of the waveform 1 Connect a noisy signal to the oscilloscope and obtain a stable display This shows a waveform with asynchronous noise in the pulse Asynchronous Noise in Pulse Figure 5 2 Making Measurements with HP 54645A D Oscilloscopes To view asynchronous noise on a signal 5 6 ...

Страница 148: ...for better resolution of the asynchronous noise Pan and zoom the waveform to view signal details To characterize the asynchronous noise signal use the cursors The following figure shows a triggered view of asynchronous noise shown in the previous figure Triggered View of Asynchronous Noise Figure 5 3 Making Measurements with HP 54645A D Oscilloscopes To view asynchronous noise on a signal 5 7 ...

Страница 149: ...scope and obtain a stable display 2 Remove the noise from the trigger path by turning on either high frequency reject or noise reject High frequency reject HF reject adds a low pass filter with the 3 dB point at 50 kHz You use HF reject to remove high frequency noise such as AM or FM broadcast stations from the trigger path HF Reject Refer to chapter 2 Front Panel Overview for more information 3 d...

Страница 150: ...steresis band By increasing the trigger hysteresis band you reduce the possibility of triggering on noise However this also decreases the trigger sensitivity so that a slightly larger signal is required to trigger the oscilloscope Random Noise on the Displayed Waveform 3 dB down point Pass Band dc 0 dB 50 kHz Figure 5 5 Figure 5 6 Making Measurements with HP 54645A D Oscilloscopes To reduce the ra...

Страница 151: ...how quickly the waveform responds to changes and how much you want to reduce the displayed noise on the signal Smoothing The term smoothing is an oversampling technique used when the digitizer sampling rate 200 MSa s is faster than the rate at which we re storing samples into acquisition memory For example if the scope is sampling at 200 MSa s yet storing the samples at 1 MSa s it needs to store o...

Страница 152: ...operates at sweep speeds from 50 s div to 2 ns div When operating the initials Pk are displayed in the status line in inverse video At sweep speeds faster than 2 ns div the Pk initials are not displayed in inverse video which indicates that peak detect is not operating Use Autostore to View waveforms that are changing View and compare waveforms with stored waveforms View narrow pulses or glitches ...

Страница 153: ...e the glitch use the cursors or the automatic measurement capabilities of the oscilloscope To use channel math 1 Press Then press either the 1 2 or 1 2 softkey 2 To turn off the channel math function press the Off softkey Additional Math Functions For the HP 54645A D Oscilloscopes without a Measurement Storage module installed the available math options are addition and subtraction Each of these f...

Страница 154: ...output over the interface For more information about using math functions 1 and 2 refer to the Measurement Storage Module User s Guide Mask Testing When a Measurement Storage module is installed in the oscilloscope mask testing is available by pressing the Mask Test softkey For more information about mask testing refer to the Measurement Storage Module User s Guide To use the Roll display mode The...

Страница 155: ...two signals of the same frequency with the Lissajous method 1 Connect a signal to channel 1 and a signal of the same frequency but out of phase to channel 2 2 Press Autoscale press Main Delayed then press the XY softkey 3 Center the signal on the display with the Vertical Position HP 54645A or Analog Position HP 54645D knobs and use the Volts Div knobs and the vertical Vernier softkeys to expand t...

Страница 156: ...the Y value at the bottom of the display In this example we are using the Y cursors but you could have used the X cursors instead If you use the X cursors make sure you center the signal in the Y axis Cursors Set on Displayed Signal Figure 5 9 Figure 5 10 Making Measurements with HP 54645A D Oscilloscopes To use the XY display mode 5 15 ...

Страница 157: ...is turned off Channel 1 is the X axis input channel 2 is the Y axis input and the external trigger in the HP 54645A is the Z axis input If you only want to see portions of the Y versus X display use the Z axis input Z axis turns on and off the trace analog oscilloscopes called this Z blanking because it turned the beam on and off When Z is low 1 4 V Y versus X is displayed when Z is high 1 4 V the...

Страница 158: ...Signals are 90 Out of Phase Signals are In Phase Figure 5 12 Figure 5 13 Making Measurements with HP 54645A D Oscilloscopes To use the XY display mode 5 17 ...

Страница 159: ... interval with delayed sweep windowed on the vertical interval test signals VITS and the IRE displayed full screen 1 Connect a TV signal to channel 1 then press Autoscale 2 Press Display then press the Peak Det softkey 3 On HP 54645A press Slope Glitch then press the TV softkey if it is not selected and TV Menu In the TV menu select the TV Mode to be Field 2 4 On HP 54645D press Advanced then pres...

Страница 160: ...layed then press the Delayed softkey Pan and zoom the waveform to view signal details 7 Set the delayed sweep to 20 µs div then set the expanded portion over the VITS delay about 900 µs Field 1 Vertical Interval Windowed on the VITS Figure 5 14 Making Measurements with HP 54645A D Oscilloscopes To analyze video waveforms 5 19 ...

Страница 161: ... vernier to change the time base to 1 µs div then center the signal on the display with the Delay knob delay about 901 µs Modulated 12 5T Pulse on the FCC Composite Test Signal Figure 5 15 Making Measurements with HP 54645A D Oscilloscopes To analyze video waveforms 5 20 ...

Страница 162: ...d because its frequency is an odd multiple of one half the line frequency When looking at live video usually a field use peak detect to improve the appearance of the display When making cursor measurements use Autostore since you are usually looking for pulse flatness and extremes When using line trigger use minimum holdoff to display all the lines Due to the relationship between the horizontal an...

Страница 163: ... t2 or both t1 and t2 If a Measurement Storage module is installed in the oscilloscope and you select F2 as the source with FFT turned on the active cursors include f1 and f2 Use the Entry knob to change the active cursor Clear Cursors erases the cursor readings and removes the cursors from the display On HP 54645D the Readout softkey gives a reading of the time or voltage cursor measurement For t...

Страница 164: ... of the screen If you set a cursor then pan and zoom the waveform until that cursor is off the screen when you set the other cursor the measurement will still be accurate Cursors Measure Pulse Widths other than 50 Points Cursors Measure Frequency of Pulse Ringing Figure 5 16 Figure 5 17 Making Measurements with HP 54645A D Oscilloscopes To make cursor measurements 5 23 ...

Страница 165: ...Track Delayed Sweep Expand the display with delayed sweep then characterize the event of interest with the cursors Figure 5 18 Making Measurements with HP 54645A D Oscilloscopes To make cursor measurements 5 24 ...

Страница 166: ...hlighted allows you to move them together when rotating the Entry knob Checking Pulse Width Variations Move the cursors together to check for pulse width variations in a pulse train Figure 5 19 Figure 5 20 Making Measurements with HP 54645A D Oscilloscopes To make cursor measurements 5 25 ...

Страница 167: ...s 1 or 2 on HP 54645A or A1 or A2 on HP 54645D for the frequency measurement On HP 54645D you can also select any of the digital channels that are displayed for the frequency measurement 4 Press the Freq softkey The oscilloscope automatically measures the frequency and displays the result on the lower line of the display The number in parentheses after the word Freq for example Freq 1 for HP 54645...

Страница 168: ... the measurement Automatic Measurements The oscilloscope makes automatic measurements on the first displayed event The following figure shows how to use delayed sweep to isolate an event for a frequency measurement If the measurement is not possible in the delayed time base mode then the main time base is used If the waveform is clipped it may not be possible to make the measurement Isolating Even...

Страница 169: ...cope and obtain a stable display When the signal has a well defined top and bottom the rise time and fall time measurements are made at the 10 and 90 levels If the oscilloscope cannot find a well defined top or bottom the maximum and minimum levels are used to calculate the 10 and 90 points from These levels are shown in the section on making voltage measurements automatically The following figure...

Страница 170: ...ext Menu softkey Another menu appears with positive and negative pulse width and rise time and fall time measurement choices Show Meas show measurement places the horizontal and vertical cursors to show where the measurement was taken Time Measurements include positive width negative width rise time and fall time Pulse width measurements are made at the 50 levels Rise time and fall time measuremen...

Страница 171: ...d event The following figure shows how to use delayed sweep to isolate an edge for a rise time measurement Isolating Edge for Rise Time Measurement 5 To measure the fall time press the Fall Time softkey Rise Time and Fall Time Measurements Rise time and fall time measurements do not work on digital channels on HP 54645D Figure 5 23 Making Measurements with HP 54645A D Oscilloscopes To make time me...

Страница 172: ...ive pulse width press Next Menu until you find the Width softkey and press it Positive Width Measurement on HP 54645D Digital Channels 2 To measure the negative pulse width press Next Menu until you find the Width softkey and press it Figure 5 24 Making Measurements with HP 54645A D Oscilloscopes To make time measurements automatically 5 31 ...

Страница 173: ...ides you through the Voltage keys by making an rms voltage measurement Steps for making other voltage measurements are included at the end of the procedure The following figures show pulses with some of the voltage measurement points Pulse with Well Defined Top and Bottom Pulse with Top and Bottom not Well Defined Figure 5 25 Figure 5 26 Making Measurements with HP 54645A D Oscilloscopes To make v...

Страница 174: ...ar Meas clear measurement erases any measurement results from the display and removes the horizontal and vertical cursors from the display Next Menu displays the next softkey menu with additional voltage measurement choices 3 Press the V top softkey The oscilloscope automatically measures the top voltage and displays the result on the screen Automatic Measurements The oscilloscope makes automatic ...

Страница 175: ... measurement was taken Voltage Measurements include choices for measuring the maximum Vmax minimum Vmin top Vtop and base Vbase voltages Next Menu displays the next softkey menu With the Measurement Storage module attached to the oscilloscope you can also measure amplitude Vamp overshoot Vover and preshoot Vpre voltages Figure 5 27 Making Measurements with HP 54645A D Oscilloscopes To make voltage...

Страница 176: ...6 Using Option 005 Enhanced TV Video Trigger HP 54645A ...

Страница 177: ...l of the oscilloscope has knobs grey keys and white keys The knobs are used most often and are similar to the knobs on other oscilloscopes The grey keys bring up softkey menus on the display that allow you access to many of the oscilloscope features The white keys are instant action keys and menus are not associated with them The status line of the oscilloscope located at the top of of the display...

Страница 178: ...asurements The HP 54645A Oscilloscope s MegaZoom technology gives you bright easily viewed displays of any part of the video waveform No longer do you need to use a viewing hood or to be constantly adjusting intensity and focus controls Analysis of video waveforms is simplified by the oscilloscope s ability to trigger on any selected line of the video signal You can make additional measurements us...

Страница 179: ...d has been previously selected you may skip this step 4 Press Slope Glitch then press the Video Autoscale softkey Provide Correct Matching Many TV signals are produced from 75 Ω sources To provide correct matching to these sources an HP 11094B 75 Ω load is included as an accessory For oscilloscopes that have selectable input impedance the 1 MΩ input should be used with the 75 Ω load The Undo Autos...

Страница 180: ...pe Glitch in the TRIGGER section of the front panel then press the TV and TV Menu softkeys Press Line Select the number of the line you want to examine 3 Press the Trigger On Field softkey to select the TV field of the line you want to trigger on Your choices are Field 1 Field 2 and Alt Fld Alternate Fields Alternate Triggering If Alt Fld is selected the oscilloscope will alternately trigger on th...

Страница 181: ...epresents the number of a count instead of a real line number This is reflected in the label above the softkey changing from Line to Cnt In the Trigger On selections Field 1 Field 2 and Vertical are used to indicate where the counting starts For an interlaced TV system the counting starts from the rising edge of the first vertical serration pulse of Field 1 and or Field 2 For a non interlaced TV s...

Страница 182: ...ction To autoscale on a video signal 2 Press Slope Glitch in the TRIGGER section of the front panel then press the TV and TV Menu softkeys Press All Lines Vertical Interval can be Blocked The 21 lines in the Vertical Interval can be blocked from this display if the Vert Rej On mode is selected The three color sync bursts being displayed inside the white bars are on vertical interval lines These co...

Страница 183: ... in the specified field 1 or 2 1 Select the TV display TV as the trigger mode and the appropriate TV standard as described in the section To autoscale on a video signal 2 Press Slope Glitch in the TRIGGER section of the front panel then press the TV and TV Menu softkeys Press Field 1 or Field 2 Triggering on Field 1 Serration pulses Equalizing pulses Figure 6 3 Using Option 005 Enhanced TV Video T...

Страница 184: ... it finds at the start of acquisition 1 Select the TV display TV as the trigger mode and the appropriate TV standard as described in the section To autoscale on a video signal 2 Press Slope Glitch in the TRIGGER section of the front panel then press the TV and TV Menu softkeys Press All Fields Triggering on All Fields Figure 6 4 Using Option 005 Enhanced TV Video Trigger HP 54645A To trigger on al...

Страница 185: ...e TV and TV Menu softkeys Press Field 1 or Field 2 The trigger circuits look for the position of the start of Vertical Sync to determine the field But this definition of field does not take into consideration the phase of the reference subcarrier When Field 1 is selected the trigger system will find any field where the vertical sync starts on Line 4 In the case of NTSC video the oscilloscope will ...

Страница 186: ...elds will be selected with Field 2 Table 6 2 Holdoff Settings Video Standard Fields Picture Holdoff Range NTSC 4 33 5 ms to 50 0 ms PAL 8 80 7 ms to 120 ms SECAM 4 40 4 ms to 60 ms PAL M 8 80 4 ms to 120 ms The holdoff can be more easily set if the sweep speed is set to 5 ms div Once you have established your desired holdoff time return to the desired time base setting The holdoff setting will rem...

Страница 187: ...of the video changes select AC coupling For this exercise we connect the oscilloscope to the video output terminals on a television We set up the oscilloscope to view the second vertical interval with delayed sweep windowed on the vertical interval test signals VITS Then we make windowed measurements with the delayed sweep 1 Connect a TV signal to channel 1 and select channel 1 as your trigger sou...

Страница 188: ...the Delayed softkey 7 Set the delayed sweep to 20 µs div then set the expanded portion over the VITS delay about 988 8 µs Second VITS Displayed This figure shows the second vertical interval test signals displayed with delayed sweep Figure 6 7 Using Option 005 Enhanced TV Video Trigger HP 54645A To analyze video waveforms with Option 005 6 13 ...

Страница 189: ...6 14 ...

Страница 190: ...7 Testing Adjusting and Troubleshooting ...

Страница 191: ... oscilloscope and performing tests to ensure that the oscilloscope meets performance specifications It also describes how to verify operation of the Option 005 Enhanced TV Video Trigger board along with information for adjusting the offset and troubleshooting The sections in this chapter include Solving Problems Getting Service Verifying Oscilloscope Performance Adjusting the Oscilloscope Troubles...

Страница 192: ...h HP 54645A D Oscilloscopes This chapter describes possible solutions if you encounter problems while making measurements with HP 54645A D Oscilloscopes If you need to replace parts refer to chapter 8 Replacement Parts 7 3 ...

Страница 193: ...re securely inserted into the connector assembly and that the grabbers make good contact with the probe lead wires Check that the grabbers are securely connected to the nodes of the circuit under test and that the ground is connected Check that the circuit under test is powered on Press Autoscale Reset the oscilloscope To reset the entire oscilloscope press and hold any softkey and switch the osci...

Страница 194: ...under test See chapter 1 for more information on probing considerations Check that the trigger setup is correct A correct trigger setup is probably the most important factor in helping you capture the desired data See the chapter Triggering HP 54645A D Oscilloscopes for information on triggering particularly pattern and advanced triggers and information on logic oscilloscope triggering concepts Ch...

Страница 195: ...Autoscale to obtain an automatic setup for all channels If you can t get any response from the oscilloscope On the HP 54645D press the Label key on the front panel and the power switch at the same time Release the Label key when the measurement display appears Set the calibration switch on the back of the scope to UNPROTECTED Press and hold the two right most softkeys 5 and 6 simultaneously and sw...

Страница 196: ... the warranty period has expired you can still return the oscilloscope to Hewlett Packard for all service work Contact your nearest Hewlett Packard Sales Office for additional details on service work If the warranty period has expired and you decide to service the oscilloscope yourself the instructions in this chapter can help you keep the oscilloscope operating at optimum performance 7 7 ...

Страница 197: ... to the rear of the oscilloscope Do not ship accessories back to Hewlett Packard unless they are associated with the failure symptoms 3 Protect the control panel with cardboard 4 Pack the oscilloscope in styrofoam or other shock absorbing material and place it in a strong shipping container You can use either the original shipping containers or order materials from an HP Sales Office Otherwise pac...

Страница 198: ... load is used to troubleshoot the power supply Refer to To construct your own dummy load later in this chapter This section explains how to build the test connectors To construct test connectors for digital channels Instructions for HP 54645D These instructions apply only to the HP 54645D Mixed Signal Oscilloscope The test connectors connect the oscilloscope to the test equipment Table 7 1 Materia...

Страница 199: ...to the center pin of the other row on the Berg strip 8 by 2 Connector Setup 2 Build the second test connector using a BNC connector and a 1 by 2 section of Berg strip a Solder two resistors to the Berg strip in parallel across the two pins b Solder the center of the BNC connector to the center pin of one row on the Berg strip c Solder the ground tab of the BNC connector to the center pin of the ot...

Страница 200: ...ther input source 2 Connect digital channels D0 D1 D2 and D3 to the calibration point on the HP 54645D front panel using probe leads and grabbers 3 Press Autoscale If four square waves appear the acquisition system is functioning correctly 4 Repeat steps 2 and 3 with the following sets of digital channels 4 5 6 7 8 9 10 11 12 13 14 15 Be sure to disconnect each set of digital channels from the cal...

Страница 201: ...e detailed steps for digital channels D0 D7 substituting digital channels D8 D15 for digital channels D0 D7 in the instructions Each threshold test tells you to record the voltage reading in the Performance Test Record located at the end of this chapter To check if each test passed verify that the voltage reading you record is within the limits listed on the Performance Test Record Table 7 2 Equip...

Страница 202: ... generator DC output voltage with the multimeter 3 Using the 8 by 2 test connector and BNC cable assembly connect digital channels D0 D7 to one side of the BNC Tee Connect the D0 D7 ground lead to the ground side of the 8 by 2 connector 4 Using a BNC banana cable connect the voltmeter to the other side of the BNC Tee 5 Connect the BNC Tee to the Main Signal output of the function generator Thresho...

Страница 203: ...Using the Modify down arrow on the function generator decrease offset voltage in 10 mV increments until all activity indicators for digital channels D0 D7 show the digital channels at a digital low Record the function generator voltage in the performance test record d Using the Modify up arrow on the function generator increase offset voltage in 10 mV increments until all activity indicators for d...

Страница 204: ...cal specifications Recommended Model Part Digital Multimeter 0 1 mV resolution better than 0 01 accuracy HP 34401A Cable BNC HP 10503A 1 Connect a multimeter to the rear panel CALIBRATOR connector 2 Press Print Utility 3 Press the Service Menu softkey then the Self Test softkey and then the DAC softkey The multimeter should measure 0 00 V dc 500 µV If the result is not within the test limits see T...

Страница 205: ...ull scale on all other ranges is defined as 8 divisions times the V div setting 1 LSB 0 4 of full scale Table 7 5 Equipment Required Equipment Critical specifications Recommended Model Part Power supply 14 mV to 35 Vdc 0 1 mV resolution HP 6114A Digital multimeter Better than 0 01 accuracy HP 34401A Cable BNC Qty 2 HP 10503A Shorting cap BNC HP 1250 0774 Adapter BNC f to banana m HP 1251 2277 Adap...

Страница 206: ...illoscope performs averaging 2 Press Cursors then press the V1 softkey 3 Using the Entry knob set the V1 cursor on the baseline of the signal 4 Connect the power supply to the oscilloscope and to the multimeter using the BNC tee and cables 5 Adjust the power supply output so that the multimeter reading displays the first Power supply setting value in the following table Wait a few seconds for the ...

Страница 207: ... 700 mV 684 8 mV to 715 2 mV 50 mV Div 350 mV 342 4 mV to 357 6 mV 20 mV Div 140 mV 136 96 mV to 143 04 mV 10 mV Div 70 mV 68 48 mV to 71 52 mV 5 mV Div 35 mV 34 24 mV to 35 76 mV 2 mV Div 14 mV 13 696 mV to 14 304 mV 1 mV Div 7 mV 6 696 mV to 7 304 mV Full scale is defined as 16 mV on the 1 mV div range Full scale on all other ranges is defined as 8 divisions 8 Disconnect the power supply from th...

Страница 208: ...B dc to 100 MHz ac coupled 10 Hz to 100 MHz Test limits at 10 mV div all channels 3 dB dc to 75 MHz ac coupled 10 Hz to 75 MHz Table 7 7 Equipment Required Equipment Critical specifications Recommended Model Part Signal generator 1 to 100 MHz at 200 mV HP 8656B opt 001 Power meter and Power Sensor 1 to 100 MHz 3 accuracy HP 436A and HP 8482A Power splitter Outputs differ by 0 15 dB HP 11667B Cable...

Страница 209: ...e that the signal on the display is about 5 cycles and six divisions of amplitude 4 Press Voltage then press the Vp p softkey Wait a few seconds for the measurement to settle averaging is complete then note the Vp p reading from the bottom of the display Vp p _______ V 5 Set the calibration factor percent of the power meter to the 1 MHz value from the calibration chart on the probe then press dB R...

Страница 210: ...ult 10 Correct the result from step 9 with any difference in the power meter reading from step 7 Make sure you observe all number signs Example Result from step 9 2 3 dB Power meter reading from step 7 0 2 dB REL True response 2 3 0 2 2 1 dB The true response should be 3 dB If the result is not 3 dB see Troubleshooting the Oscilloscope 11 Repeat steps 1 to 10 for channel 2 Channel 2 is labeled 2 o...

Страница 211: ...beled 1 on HP 54645A and A1 on HP 54645D 2 Set up the oscilloscope a Press Setup then press the Default Setup softkey a Press Display then press the Vectors Off softkey c Press Autoscale d Set the time base to 20 µs div e Press Main Delayed then press the Time Ref Left softkey f Adjust the trigger level to obtain a stable display 3 Press Time then press the Freq and Period softkeys You should meas...

Страница 212: ...ge the time mark generator to 10 ns and change the time base to 5 ns div Adjust the trigger level to obtain a stable display 7 Press Time then press the Freq and Period softkeys You should measure the following Frequency 100 MHz test limits are 98 61 MHz to 101 43 MHz Period 10 ns test limits are 9 86 ns to 10 14 ns If the measurements are not within the test limits see Troubleshooting the Oscillo...

Страница 213: ... MHz to 100 MHz 1 5 div or 3 0 mVp p 10 mV div to 5 V div dc to 25 MHz 0 35 div or 3 5 mVp p 25 MHz to 100 MHz 1 0 div or 10 0 mVp p External trigger dc to 25 MHz 50 mVp p 25 MHz to 100 MHz 100 mVp p Table 7 9 Equipment Required Equipment Critical specifications Recommended Model Part Signal generator 25 MHz and 100 MHz sine waves HP 8656B Option 001 Power splitter Outputs differ 0 15 dB HP 11667B...

Страница 214: ... not help see Troubleshooting the Oscilloscope f Record the result on the Performance Test Record as Pass or Fail 4 Verify the trigger sensitivity at 100 MHz and 1 division a Change the output of the signal generator to 100 MHz and set amplitude to about 100 mV b Set the time base to 10 ns div c Decrease the output of the signal generator until there is 1 vertical division of the signal displayed ...

Страница 215: ...the 200 mVp p so that 100 mVp p is applied to each of the oscilloscope inputs c Press Autoscale d Press Source Set the trigger source to Ext e Check for stable triggering and adjust the trigger level if necessary f Record results in the Performance Test Record as Pass or Fail If test fails refer to Troubleshooting the Oscilloscope g Change the output of the signal generator to 25 MHz and 35 4 mVrm...

Страница 216: ...r to the channel 1 input of the oscilloscope 2 Set the signal generator to equal the full bandwidth of your oscilloscope and set the output level to 0 dBm 3 Connect the signal generator to the oscilloscope s channel 1 Use a 50 Ω feedthrough to correctly terminate the signal generator 4 Press Autoscale 5 Adjust the oscilloscope controls and signal generator to obtain an 8 division high display 6 Co...

Страница 217: ...__________ 100 mV Div 700 mV 684 8 mV to 715 2 mV _____________ _____________ 50 mV Div 350 mV 342 4 mV to 357 6 mV _____________ _____________ 20 mV Div 140 mV 136 96 mV to 143 04 mV _____________ _____________ 10 mV Div 70 mV 68 48 mV to 71 52 mV _____________ _____________ 5 mV Div 35 mV 34 24 mV to 35 76 mV _____________ _____________ 2 mV Div 14 mV 13 696 mV to 14 304 mV _____________ _______...

Страница 218: ...ied to the oscilloscope and with the protective covers removed Only trained service personnel who are aware of the hazards involved should perform the maintenance Whenever possible perform the procedures with the power cord removed from the oscilloscope Read the safety summary at the back of this book before proceeding C AU TI O N Do not disconnect any cables or remove any assemblies with the powe...

Страница 219: ...ifications Recommended Model Part Digital multimeter 0 1 mV resolution accuracy 0 05 HP 34401A 1 Set up the oscilloscope for the voltage adjustment a Turn off the oscilloscope and disconnect power cable b Remove the cover from the oscilloscope See chapter 8 Replacement Parts c Place the oscilloscope on its side d Connect the negative lead of the digital multimeter to a ground point on the oscillos...

Страница 220: ...asurements are within the following tolerances Table 7 12 Power Supply Voltage Tolerances Supply Voltage Tolerance 5 1 V 153 mV 4 947 V to 5 253 V 5 25 V 158 mV 5 092 V to 5 408 V 15 75 V 1 260 V 787 mV 14 963 V to 17 010 V 15 75 V 787 mV 14 963 V to 16 537V Low Voltage Power Supply Voltage Test Points bottom side of oscilloscope Figure 7 4 Testing Adjusting and Troubleshooting To adjust the power...

Страница 221: ...gure The 15 75 V supplies are not adjustable and are dependent upon the 5 1 V supply If adjusting the power supply does not bring all the voltages within tolerance see Troubleshooting the Oscilloscope in this chapter Low Voltage Power Supply Adjustment Locations top side of oscilloscope 5 25 V adjust 5 25 V adjust fan connector Figure 7 5 Testing Adjusting and Troubleshooting To adjust the power s...

Страница 222: ...for HP 54645A Critical specifications Recommended Model Part Pulse generator 100 kHz 1 Vp p rise time 10 ns HP 8112A Cable BNC 3 feet HP 10503A Cable BNC 9 inches Qty 2 HP 10502A Adapter BNC tee m f f HP 1250 0781 Adapter BNC f f HP 1250 0080 Feedthrough 50Ω BNC m and f HP 11048C Equipment for HP 54645D Critical specifications Recommended Model Part Cable BNC 3 feet HP 10503A Probe 10x1 100 MHz HP...

Страница 223: ...1 Vp p with a rise time of less than 10 ns to channels 1 and 2 Place the feedthrough at the BNC tee Make sure you use the HP 10502A cables to ensure equal cable lengths 7 Press the Delay softkey then follow the instructions on the display 8 Set the rear panel CALIBRATION switch to PROTECTED Delay self cal for HP 54645D Only 9 Connect channels A1 and A2 to the front panel probe adjust signal 5 Vp p...

Страница 224: ...feedthrough connect the square wave generator to channel 1 Use the 50 Ω feedthrough at the oscilloscope input Channel 1 is labeled 1 on HP 54645A and A1 on HP 54645D 2 Adjust the generator for about 30 kHz at about 3 Vp p 3 Press Autoscale 4 Set channel 1 to 500 mV div You must perform this adjustment on the 500 mV range Channel 1 is labeled 1 on HP 54645A and A1 on HP 54645D 5 Adjust the output o...

Страница 225: ...eference Designators To adjust the high frequency pulse response In this procedure you adjust the high frequency pulse response for each channel Table 7 15 Equipment Required Equipment Critical specifications Recommended Model Part Pulse generator Rise time 875 ps PSPL 1107B TD and PSPL 1110B Driver Adapter SMA f to BNC m HP 1250 1787 Feedthrough 50Ω BNC m and f HP 11048C Figure 7 6 Testing Adjust...

Страница 226: ...ernier softkey to On 5 Adjust the Volts Div until there are about 6 divisions of vertical deflection 6 Adjust the channel 1 high frequency response for 1 0 minor division of overshoot 4 7 Repeat steps 1 through 6 for channel 2 Channel 2 is labeled 2 on HP 54645A and A2 on HP 54645D High Frequency Pulse Response Adjustment Locations High frequency pulse response adjustments Figure 7 7 Testing Adjus...

Страница 227: ...igital multimeter to the end of R901 which is closest to the fuse 2 Adjust B for 14 00 V 3 Press Print Utility Press Service Menu then Self Tst Menu and Display 4 Adjust V HO vertical hold for vertical synchronization 5 Set the intensity control on the front panel to mid range 6 Adjust Sub Bri sub bright to the lowest setting so that the half bright blocks on the display are visible 7 Increase the...

Страница 228: ... Adjust Focus for the best focus 11 Press any key to continue to the normal display pattern Then adjust V Lin vertical linearity for equal sizing of all four corner squares 12 Adjust V Size vertical size to center the display vertically at the maximum allowable size without losing the text Adjustments V Lin and V Size interact so you may need to re adjust sizing and vertical centering of the displ...

Страница 229: ...t a Turn off the oscilloscope b Remove the cabinet from the oscilloscope c Connect the negative lead of the digital multimeter to a ground point on the oscilloscope d Connect the oscilloscope s vertical output to the voltage inputs of the digital multimeter DMM using the DMM s test leads and the BNC to dual banana post adapter e Turn on the oscilloscope f Set up the digital multimeter for a DC vol...

Страница 230: ...ore proceeding C AU TI O N Do not disconnect any cables or remove any assemblies with the power applied to the oscilloscope or damage to the oscilloscope can occur C AU TI O N ELECTROSTATIC DISCHARGE ESD can damage electronic components When doing any of the procedures in this chapter you should use proper ESD precautions As a minimum you should place the instrument on a properly grounded ESD mat ...

Страница 231: ...n pins 9 12 5 25 V requires a 3 A load 1 75 Ω and 15 8 W on pins 15 18 15 75 V requires a 1 3 A load 12 2 Ω and 20 5 W on pins 5 6 15 75 V requires a 0 8 A load 19 7 Ω and 13 W on pin 3 3 Connect the other end of the resistors to ground pins 2 4 7 8 13 14 19 and 20 Low Voltage Power Supply Connector 5 25 V adjust 5 25 V adjust fan connector Figure 7 9 Testing Adjusting and Troubleshooting To const...

Страница 232: ... AU TI O N If you operate the oscilloscope without the cabinet use an external fan to blow air across the system board This air flow is necessary to cool the heat sinks on the system board 5 Connect the power cord then turn on the oscilloscope If the display comes on after a few seconds HP logo and copyright text followed by a graticule with text at top of the display go to To check the Low Voltag...

Страница 233: ...voltages are within the test limits replace the display assembly If not do the steps below a Disconnect the power cord b Disconnect the ribbon cable from the power supply c Connect the dummy load to the power supply connector d Connect the power cord then measure the power supply voltages again see new tolerances below If the voltages are now within the test limits replace the system board If not ...

Страница 234: ...too hot for safe operation a Disconnect the fan cable from the power supply b Measure the fan voltage at the connector on the power supply See the following figure for location of the fan connector If the fan voltage is approximately 8 Vdc replace the fan If not replace the power supply Fan Connector 5 25 V adjust 5 25 V adjust fan connector Figure 7 10 Testing Adjusting and Troubleshooting To che...

Страница 235: ...If default vertical calibration factors are loaded and error messages remain contact your HP service center for diagnosis and repair 2 If the message Horizontal cal factors failed checksum defaults loaded appears on screen go to To perform the self calibration and perform the self calibration for your instrument then continue to steps below This message means that the horizontal delay calibration ...

Страница 236: ...oscilloscope again b Hold the menu key down until the message Key down power up executed is displayed c If the original fail message still appears contact your HP Service Center for diagnosis and repair 4 Continue with To check out the oscilloscope Testing Adjusting and Troubleshooting To clear error messages 7 47 ...

Страница 237: ...ultimeter to a ground point on the oscilloscope Connect the power cord and turn on the oscilloscope 3 Measure the power supply voltages at E1 through E6 on the system board See the following figure Table 7 21 Power Supply Voltage Tolerances Supply Voltage Tolerance 5 1 V 153 mV 4 947 V to 5 253 V 5 25 V 158 mV 5 092 V to 5 408 V 15 75 V 1 260 V 787 mV 14 963 V to 17 010 V 15 75 V 787 mV 14 963 V t...

Страница 238: ...er supply The 15 75 V supplies are not adjustable and are dependent upon the 5 1 V supply Blown fuse If the power supply fuse is blown the power supply is defective Replace the power supply C AU TI O N Be careful when performing component level repair Voltages greater than 300 Vdc can cause injury Testing Adjusting and Troubleshooting To check the Low Voltage Power Supply 7 49 ...

Страница 239: ...lay b Press each key and notice that when you press a key a corresponding block on the display fills in c Rotate the knobs except the intensity and notice that an arrow appears on the display that points in the direction you rotate the knob d Do all the keys and knobs work If yes press Stop two or three times the display indicates how many times then go to step 3 If not replace the keyboard 3 Chec...

Страница 240: ...ay message says Scope self test Failed replace the system board 5 Perform the RAM test a Press the RAM softkey b Does the display message say Scope self test passed If yes press any key to continue If not the display message says Scope self test Failed replace the system board Testing Adjusting and Troubleshooting To run the internal self tests 7 51 ...

Страница 241: ...n 005 board to the system board 2 Verify proper oscilloscope operation as described in this chapter 3 If the oscilloscope passes the performance verification and the malfunction still occurs when the Option 005 board is reconnected then you should replace the Option 005 board Testing Adjusting and Troubleshooting To troubleshoot Option 005 7 52 ...

Страница 242: ...8 Replacement Parts ...

Страница 243: ...he power cord from the oscilloscope Wait at least three minutes for the capacitors in the oscilloscope to discharge before you begin disassembling the oscilloscope Read the Safety Summary at the back of this manual before beginning disassembly C AU TI O N Do not replace assemblies with the oscilloscope turned on or damage to the components can occur C AU TI O N ELECTROSTATIC DISCHARGE ESD can dama...

Страница 244: ...eed the following tools to disassemble the oscilloscope T15 TORX driver to remove the oscilloscope from the cabinet and to remove the fan T10 TORX driver to remove the assemblies from the deck Flat blade screwdriver to remove the front panel and power shaft and the optional interface modules and pouch You can remove any of the following assemblies fan front panel display system board power supply ...

Страница 245: ... driver remove the two screws from the rear of the cabinet 4 Using your thumbs gently push on the rear panel connector to slide the oscilloscope out of the cabinet To remove the fan 1 Disconnect the fan cable from the power supply board 2 Using the T15 TORX driver remove the three screws that hold the fan to the deck Replacement Parts To remove the cabinet 8 4 ...

Страница 246: ...circuit board The circuit board may be depressed slightly with a screwdriver to avoid damage to the circuit board 5 Rotate the front panel out until the bottom clears the rear of the assembly then lift the front panel to free the hooks on top When installing the front panel make sure that the power switch shaft is aligned with its mating hole in the front panel The front panel swings in to engage ...

Страница 247: ... system board to ground 4 As you lift the display rotate it off the two tabs on the side of the deck To remove the system board 1 Using the T10 TORX driver remove the eight screws that hold the system board to the deck 2 Remove the two screws from the rear panel interface connector 3 Remove the hex nut and washer from the rear BNC HP 54645A D 4 Disconnect the three ribbon cables and the calibratio...

Страница 248: ... 54645A and to channel A1 and A2 BNC connectors on HP 54645D 1 Remove the system board 2 De solder the center conductor wire and the probe readout wire from the board 3 Using the T10 Torx driver remove the screw holding the BNC to the housing Replacement Parts To remove the front panel BNC connectors 8 7 ...

Страница 249: ...isconnect the shaft from the power switch After you disconnect the shaft make sure you position it in the recess along the side of the display bracket 5 Using the T10 TORX driver remove the screw holding the power supply board to the deck 6 Slide the power supply board toward the front panel about half an inch Slip the keyhole slots on the power supply board off of the pins on the deck Unhooking t...

Страница 250: ...hat when you re install these screws that you use the correct parts If longer screws are used they can damage the front panel label 5 Press down on the top of the keyboard and rotate the bottom of the keyboard out To remove the handle Rotate the handle down until it is just past the last detent position about 1 2 inch before the handle touches the bottom of the oscilloscope then pull the sides of ...

Страница 251: ...illoscope After you remove the defective board follow the instructions in reverse order to install the new Option 005 board 1 Remove the oscilloscope from the cabinet a Turn off the oscilloscope and disconnect the power cable b If a module is installed in the oscilloscope remove it c Using the T15 TORX driver remove the two screws from the rear of the cabinet d Using your thumbs gently push on the...

Страница 252: ...change assembly return the defective assembly to Hewlett Packard Customers in the United States have 30 days to return the defective assembly If you do not return the faulty assembly within the 30 days Hewlett Packard will charge you an additional amount This amount is the difference in price between a new assembly and that of the exchange assembly For orders not originating in the United States c...

Страница 253: ...s through a direct mail order system The advantages to the system are direct ordering and shipment from the HP Parts Center in Mountain View California There is no maximum or minimum on any mail order There is a minimum amount for parts ordered through a local Hewlett Packard Sales Office when the orders require billing and invoicing Transportation costs are prepaid there is a small handling charg...

Страница 254: ...Exploded View of HP 54645A D Oscilloscope Figure 8 3 Replacement Parts To order a replacement part 8 13 ...

Страница 255: ...45 41902 1 Large keypad MP3 HP 54645D 54645 41901 1 Large keypad MP4 HP 54645A 54645 94302 1 Front panel label MP4 HP 54645D 54645 94301 1 Front panel label MP5 HP 54645A 54645 94303 1 Handle Label MP5 HP 54645D 54645 94304 1 Handle Label MP6 54601 00102 1 Deck MP7 HP 54645A 54645 09102 1 EMI gasket MP7 HP 54645D 54645 09104 1 EMI gasket MP8 54601 41902 1 Small rubber keypad MP9 HP 54645A 54645 42...

Страница 256: ...pe W1 8120 0698 Power cord option 904 250 V USA Canada W1 8120 2296 Power cord option 906 Switzerland W1 8120 2957 Power cord option 912 Denmark W1 8120 4600 Power cord option 917 Africa W1 8120 4754 Power cord option 918 Japan Option 101 Accessory pouch and front panel cover also orderable as HP P N 54600 68701 5041 9482 Pouch 54601 44101 Front panel cover Probes 10074A 2 X1 passive probe Input C...

Страница 257: ...Exploded View of Option 005 and Related Oscilloscope Parts Figure 8 4 Replacement Parts To order a replacement part 8 16 ...

Страница 258: ... 7 Machine screw M3 X 6 2 screws for Option 005 MP6 54601 00101 1 Deck part of standard instrument MP11 54602 64402 1 Cabinet comes with handle and feet installed replaces standard cabinet MP30 54602 94305 1 Label rear panel video trigger W4 54602 61601 2 RF cable W5 54602 61602 1 Ribbon cable HP 11094B 1 75 Ω Termination See the HP 54645A D Oscilloscope Replaceable Parts table for this part numbe...

Страница 259: ...8 18 ...

Страница 260: ...9 Performance Characteristics ...

Страница 261: ...Performance Characteristics This chapter lists the operating characteristics and performance specifications for both the HP 54645A and HP 54645D Oscilloscopes 9 2 ...

Страница 262: ...sor Accuracy DC vertical gain accuracy DC vertical offset accuracy 1 2 LSB LSB 0 4 of full scale Dual Cursor Accuracy DC vertical gain accuracy 1 LSB Bandwidth 3dB Repetitive Single shot 100 MHz 10 mV div 75 MHz 10 mV div 50 MHz Bandwidth limit 20 MHz Rise Time calculated 3 5 ns 10 mV div 3 9 4 6 ns 10 mV div Coupling AC DC GND AC Coupling Corner Frequency 1 5 Hz Input Impedance 1 MΩ 1 13 pF Maxim...

Страница 263: ...e Assumes threshold accuracy is perfect Input voltage threshold value 30 Input Voltage when threshold 0 84 V or 0 84 V Minimum Input Voltage Swing 500 mV peak to peak Input Capacitance 8 pF Input Resistance 100 k Ω 2 at probe tip Channel to Channel Skew 2 ns typical 3 ns maximum Predefined Thresholds TTL 1 4 V CMOS 2 5 V ECL 1 3V Cable Specifications Input Z 100 kΩ 8 pF maximum input 40 V 1 Perfor...

Страница 264: ...ing System Vertical Resolution 1 bit Maximum Horizontal Resolution 500 displayed points Sample Period 2 5 ns maximum Glitch Detection 8 channels 16 channels 5 ns 2 5 ns 5 ns Memory Depth per Channel 2 M maximum Sample Period Accuracy 0 01 Simultaneous Capture 8 channels on same pod 8 channels any 2 channels on 2 pods Available on all channels 400 MSa s 200 MSa s 200 MSa s Acquire All channels off ...

Страница 265: ...unning repetitively 500 seconds Scope delta t accuracy Same channel Channel to Channel non vernier ranges 0 01 reading 0 2 screen width 40 ps 0 01 reading 0 2 screen width 80 ps Logic delta t accuracy Same channel Channel to channel non vernier ranges 0 01 reading 0 2 screen width 1 logic sample period 2 5 or 5 ns chan to chan skew 0 01 reading 0 2 screen width 1 logic sample period 2 5 or 5 ns ch...

Страница 266: ...iv or 2 mV 1 5 div or 3 mV 35 div or 3 5 mV 1 div or 10 mV Coupling AC DC HF reject 50 kHz LF reject 50 kHz noise reject Maximum Input 400 V DC peak AC Range External Sensitivity Coupling 18 V dc to 25 MHz 50 mv 25 MHz to 100 MHz 100 mV DC HF reject 50 kHz noise reject Modes Auto Auto level Triggered normal Basic TV Line Field pattern logic on HP 54645D only Holdoff Time 200 ns to 25 seconds Perfo...

Страница 267: ...ny one source not multiple sources Oscilloscope channels rising or falling edge Digital channels rising or falling edge Pattern Trigger High Low Don t Care on all sources optionally combined with simple edge on one source The simple edge is ANDed with highs lows and don t cares If no edge is present trigger is on entrance to pattern Advanced Trigger Glitch Adv Pattern and TV types Support Basic TV...

Страница 268: ... HP 54645D only Each channel may be identified with a six character label Labels can be created from a front panel label generator and a library of up to 75 preset and user defined labels Probe Calibrator Amplitude 5 0 V Frequency 1 2 kHz HP 54645A D Power Requirements Line Voltage Range 88 to 250 Vac Line Frequency 45 to 440 Hz Power Usage 90 W Performance Characteristics HP 54645A D Setup Functi...

Страница 269: ...ing 30 g 1 2 sine 11 ms duration 3 shocks axis along major axis Total of 18 shocks Physical Size 35 26 cm wide x 17 27 cm high x 31 75 cm deep without handle Display Viewable area 10 cm V x 13 cm H Resolution 313 V x 512 H pixels Weight 7 5 kg EMI Commercial Meets FTZ 1046 class B EMI Military MIL T 28800D Meets the requirements in accordance with paragraph 3 8 3 EMI Type III and MIL STD 461C as m...

Страница 270: ... remains unchanged Holdoff Performance remains unchanged TV triggering Available on channels 1 and 2 only TV line and field 0 5 division of composite sync for stable display External trigger Performance remains unchanged Vertical output Connector Rear panel BNC f Source Impedance 50 Ω nominal Signal source Selected by internal trigger source Amplitude Approximately 90 mVp p into 50 Ω for a full sc...

Страница 271: ...9 12 ...

Страница 272: ...10 Messages ...

Страница 273: ...ves instructions for corrective action if necessary All messages in this chapter in presented in alphabetical order Other messages may be self explanatory There may be other messages that appear on the HP 54645A D display that are self explanatory or clear enough that they are not described in this chapter 10 2 ...

Страница 274: ... the display press Erase Copying screen for printing Please wait This message appears while the display is being buffered into spool memory before printing Delay at limit use delayed sweep to view large negative time This message appears when you set the oscilloscope to a much faster sweep speed after a single acquisition where the delay setting is large but the delayed sweep window is off main on...

Страница 275: ...a pattern to a value less than the minimum or greater than the maximum The minimum and maximum values are determined by the Time Div and sampling interval so you may be able to work around the problem by changing the Time Div setting See Chapter 4 MegaZoom Concepts and Oscilloscope Operation for more information on the interaction between various oscilloscope time base functions Illegal Instructio...

Страница 276: ...le via Entry Normally for those menus the softkeys Select or Move are the only valid choices No printer interface is installed Refer to manual for help You selected Print Screen from the Print Utility menu However there is no printer interface module installed You must install an HP interface module Centronics HP IB or RS 232 as appropriate for the oscilloscope to connect to the printer Printing i...

Страница 277: ...ress the On softkey under the labeled channel on the softkey line If necessary press the D0 D15 key first To select a different channel to move use the Select knob Selected channel is positioned at the bottom This message appears when you turn the HP 54645D DIGITAL Position knob counterclockwise and the selected channel is already at the bottom of the display Selected channel is positioned at the ...

Страница 278: ... you press the Save key in the Setup menu indicating that the oscilloscope setup was saved to the selected memory location 1 through 10 The test failed with error code This message appears if one of the oscilloscope self tests fails See Chapter 7 Testing Adjusting and Troubleshooting for more information on how to run self test and what to do if self test fails The Trace memory is cleared This mes...

Страница 279: ...er division must be set to a value between 50 s div and 2 ns div inclusive Use Recover Screen in Setup menu to restore the display If you inadvertently change the Volts Div on a given analog channel that analog channel will disappear from the display If you change the Volts Div back to the original setting the last scope display of that channel re appears on the screen You can also choose to recov...

Страница 280: ... is reduced to 1M Acquisition memory is located in the acquisition subsystem sample RAM Advanced trigger consists of two pattern and two edge sources com bined with a variety of operators to form the complete Advanced trigger specification Advanced trigger is best used when the events you want to capture are defined by a complex series of waveform events in the sys tem and neither pattern mode nor...

Страница 281: ...pecifica tion At very fast sweep speeds small Time Div settings the pat tern width is nearly a constant value At time base settings of 2 µs div and slower this is approximately a con stant value plus one sample period Minimum duration trigger setting specifies the shortest duration set ting that the oscilloscope can accurately verify against the incom ing pattern The minimum duration trigger setti...

Страница 282: ...of transitions at the left side of the visible display that begin and end the logic high or low value See also Minimum detectable pat tern width HP 54645A D Oscilloscope Terms Acquisition memory stores the acquired sample This memory is part of the acquisition subsystem and is located in the sample RAM Aliasing is occurring whenever the waveform display changes more than expected as you expand the...

Страница 283: ...input cou pling Channels 1 and 2 allow dc ac or ground In the trigger menu it toggles between dc and ac for trigger coupling Cursors are horizontal and verti cal markers used for making custom voltage and time measurements such as measuring time between par ticular points on the display or numeric values of the currently dis played waveforms The HP 54657A module also provides access to fre quency ...

Страница 284: ...dth and then calculates the duty cycle by dividing the period into the pulse width and multiplying the result by 100 Edge trigger is a single rising or falling edge or either that must be recognized on an input channel to satisfy the trigger condition Erase clears the current display and acquisition memory External Trigger is a non viewable input to the HP 54645A used only as a trigger source Exte...

Страница 285: ...w frequency reject adds a high pass filter with a 3 dB point at 50 kHz to the trigger path Line in TV trigger mode the oscil loscope triggers on the TV line sync pulses As a trigger source the oscil loscope triggers off of the power line frequency Main Delayed allows you to select the horizontal mode Main Delayed XY and Roll and set the vernier and time reference Measurement algorithms are used to...

Страница 286: ...rigger event and the time reference point on the display Peak Detection allows detection of analog signal extremes as the sam ple rate is decreased in the 5 s to 50 ms div time base settings Pixel memory See Display mem ory Polarity selects either positive or negative TV sync or Glitch pulses Position is a knob that moves a se lected signal vertically on the display Print copies the current displa...

Страница 287: ...cluding time base threshold channel settings measure ment definitions and labels You can use these later to verify the results of a change or you can use them regularly for testing and trou bleshooting These memories are non volatile Single single shot triggers once when the trigger conditions are met The oscilloscope must be rearmed before the oscilloscope retriggers by pressing either the Run or...

Страница 288: ...on and screen erasure STORE indicator is displayed at the right end of the status line when Autostore is selected Time allows access to the automat ic time measurement keys Time Div changes the time base in a 1 2 5 step sequence from 2 ns to 50 s for HP 54645A and from 5 ns to 50 s for HP 54645D Time Ref sets the time reference to either one graticule in from the left or right edge of the display ...

Страница 289: ...ements of the sweep speed and Volts Div Voltage allows access to the auto matic voltage measurement keys Volts Div Changes the vertical scaling in a 1 2 5 step sequence from 2 mV to 5 V Waveform parameters are meas ured using cursors XY Changes the display to a volts versus volts display Zoom means to expand the wave form on the screen You can use delayed sweep to zoom in on a por tion of the wave...

Страница 290: ...to 5 31 voltage 5 32 to 5 34 automatic probe sensing 2 23 Autoscale 2 18 to 2 19 operation of 2 20 performance characteristics 9 9 try to display channels 7 5 to 7 6 try to display trace 7 4 to 7 5 undo 2 18 to 2 19 4 48 video 6 4 6 12 Autostore and Erase 4 38 and Single 4 33 message 10 3 average mode 2 13 averaging 5 10 Av indicator 5 10 Average softkey 5 10 B bandwidth to verify 7 19 to 7 21 Ben...

Страница 291: ...lloscope package 1 6 1 9 contents of scope package 1 5 to 1 8 controls front panel 2 6 creating labels 4 56 to 4 57 cursor measurements 2 30 to 2 31 5 22 to 5 25 cursors active 2 30 5 22 clear 2 30 5 22 Cursors key 2 30 5 22 message 10 6 preset configuration 4 48 custom labels 4 54 to 4 57 D DAC softkey 7 15 damaged shipment 1 5 to 1 9 data acquisition See acquisition data channel threshold accura...

Страница 292: ...t 5 8 to 5 9 5 18 front panel dust cover 1 7 flex bezel to remove keyboard 8 9 functions 2 6 hooks 8 5 message 10 4 removing 8 5 retainer tabs 8 5 front panel keys See keys listed by name function generator 7 13 set DC offset voltage 7 14 functional controls 2 6 G GENERIC 6 4 to 6 6 GENERIC mode 6 6 glitch capture 5 11 trigger 3 2 glitch mode 2 14 good uses for advanced trigger 3 14 for edge trigg...

Страница 293: ...d trigger 3 19 to 3 24 low frequency compensation 7 35 probe circuit 4 39 to 4 42 reject 5 9 5 18 M mail order system use to replace parts 8 12 to 8 17 main sweep 2 32 Time Div for window 5 4 Main Delayed key 2 32 making test connectors 7 9 to 7 10 manuals supplied 1 5 to 1 9 marker See cursor measurements markers 2 32 for delayed sweep window 5 4 material list 1 5 to 1 9 materials for making test...

Страница 294: ... parameters for interface 2 34 part numbers cable 1 5 to 1 9 grabbers 1 5 to 1 9 ground lead 1 5 to 1 9 parts for test connectors 7 9 to 7 10 removing and ordering 8 2 parts list for oscilloscopes 8 14 passive probe impedance 4 39 to 4 42 Pattern 3 17 pattern trigger 3 17 adding edge qualifier 3 17 and edge trigger combined 3 22 applications of 3 13 entered 3 13 qualifying with edge 3 13 patterns ...

Страница 295: ...pply 8 8 disconnect to remove system board 8 6 Right time reference position 4 22 to 4 28 ringing in voltage model 4 41 rise time in voltage model 4 41 rise time measurement 5 28 RiseTime softkey 5 30 Roll display mode 5 13 RS 232 Interface module 4 43 run and Erase 4 38 Run key 2 28 self tests 7 11 S sampling period 2 13 sampling period 2 14 sample rate display 2 27 save configuration 4 44 setups...

Страница 296: ...nfiguration 4 48 test settings 7 14 test setup 7 13 voltage setting 4 51 to 4 52 threshold voltage setting 4 51 time base preset configuration 4 48 range 2 27 setting 2 13 to 2 14 setting during Autoscale 2 20 setup 2 27 varying during run 4 27 time interval of auto trigger 3 3 Time key 5 26 time measurements duty cycle 5 28 to 5 31 fall time 5 28 to 5 31 frequency 5 28 to 5 31 period 5 28 to 5 31...

Страница 297: ...gnal VITS 6 5 6 12 to 6 13 linearity 7 39 reference 2 23 reject 6 7 scaling 2 21 sensitivity 2 21 size 7 39 step size 2 22 sync 5 21 sync interval 6 8 Vertical Sync 6 10 video autoscale 6 4 6 12 signal 6 4 signal components 6 8 signal envelope 6 10 signal unclamped 6 12 trigger 5 18 5 21 6 12 waveforms 5 18 to 5 21 6 12 to 6 13 VITS 5 18 voltage adjustment 7 30 behavior in probe grounding 4 41 log...

Страница 298: ...IEC 555 3 1982 A1 1990 EN 60555 3 1987 A1 1991 IEC 801 2 1991 EN 50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN 50082 1 1992 3 V m 1kHz 80 AM 27 1000 MHz IEC 801 4 1988 EN 50082 1 1992 0 5 kV Sig Lines 1 kV Power Lines Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC and carries the CE marking acco...

Страница 299: ...1 ISM Group 1 Class A equipment Immunity EN50082 1 Code1 Notes2 IEC 555 2 IEC 555 3 IEC 801 2 ESD 4kV CD 8kV AD IEC 801 3 Rad 3 V m IEC 801 4 EFT 0 5 kV 1kV 1 1 2 1 2 1 Performance Codes 1 PASS Normal operation no effect 2 PASS Temporary degradation self recoverable 3 PASS Temporary degradation operator intervention required 4 FAIL Not recoverable component damage 2 Notes none Sound Pressure Level...

Страница 300: ... service personnel To avoid dangerous electric shock do not perform any service unless qualified to do so Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present If you energize this instrument by an auto transformer for voltage reduction make sure the common terminal is connected to the earth terminal of the power source When...

Страница 301: ...enance No other warranty is expressed or implied Hewlett Packard specifically disclaims the implied warranties of merchantability or fitness for a particular purpose Exclusive Remedies The remedies provided herein are the buyer s sole and exclusive remedies Hewlett Packard shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any ...

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