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Displaying Signals

n Step 4:

Select

Scan

and press the

ACQ

menu button again to exit the

menu.

□ Steps:

Press the

SGLSWP

button.

Note that the acquisition scans across the screen from left to right until it
reaches the trigger point and then rolls right to left from the trigger point until

a trigger occurs.

When a trigger occurs, the oscilloscope scans left to right until the record is
filled and then freezes the display.

If you want to retain a waveform for later reference, transfer it to a

SAVE REP

memory location.

To rearm the trigger circuit, press

SGL SWP

again. The previous acquisition

record will now disappear and the oscilloscope will be ready for the next

trigger.

Accumulating Signal Peaks (ACCPEAK)

Acquiring signals in

ACCPEAK

(Figure 3-8) is the best mode to use when

you want to observe the upper and lower boundaries of a signal’s amplitude

over time. It will also indicate how much the DC component of the signal
drifts or the amount of noise present in the signal.

Figure 3-8: Accumulate Peak Mode Display

Detecting Signal Glitches

A signal glitch is an aberrant spike that is not characteristic of the waveform

or level it rides on. Both the

ACCPEAK

(accumulate peak) and

PEAKDET

(peak detect) modes are excellent modes for viewing signal glitches. (If you

do not

want to see these spikes

AVERAGE

mode is best. Refer to

Averaging

Signals,

page 3-14.) While

ACCPEAK

gives the best view of signal glitches

overtime,

PEAKDET

mode is the best default mode (for sweep speeds of

5 |

j s

and slower) because it automatically captures signal spikes and pres-

2221A User Manual

3-13

Содержание 2221A

Страница 1: ...User Manual Tektronix 2221A Digital Storage Oscilloscope 070 8156 02 ...

Страница 2: ...tronix Inc Beaverton Oregon USA E200000 J300000 H700000 Tektronix United Kingdom Ltd London Sony Tektronix Japan Tektronix Holland NV Heerenveen The Netherlands Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit alpha code to identify the country of manufacture e g JP for Japan HK for Hong Kong IL for Israel etc Tektronix Inc RO Box 500 Be...

Страница 3: ...o any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improp...

Страница 4: ...s been supplied in a safe condition This manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the apparatus in safe condition The apparatus has been designed for indoor use It may occasionally be subjected to temperatures between 5PC and 10 C without degradation of its safety ...

Страница 5: ...r the 2221A Digital Storage Oscilloscope The 2221A Service Manual contains extended service information in cluding circuit description schematics and a complete electrical parts list There are two service manuals part number 070 8157 01 docu ments instruments with serial numbers BQ10100 to B019999 and part number 070 8549 XX is for serial numbers B020000 and above The 2221A 2224 2232 Optional GPIB...

Страница 6: ...It Welcome ...

Страница 7: ...ation 1 6 Installing the Accessory Pouch 1 7 Using the Power Cord Wrap 1 8 At a Glance Front Panel ___ 2 1 Power Switch 2 4 CRT Display 2 5 Display Mode 2 6 CRT Display Controls 2 8 Vertical Controls and Connections 2 10 Horizontal Controls 2 14 Trigger Controls 2 16 Cursor Controls 2 20 Acquisition Controls 2 21 Save Reference Memory Buttons 2 22 Setup Menus 2 25 Acquisition Menu 2 26 Display Men...

Страница 8: ...l Glitches 3 13 Averaging Signals 3 14 Sampling Signals 3 14 Clocking Acquisitions 3 15 Selecting the Acquisition Record Length 1K 4K 3 15 Compressing the Acquisition Record Length 4K Compress 3 16 Positioning the Acquisition Record 3 17 Preventing Signal Aliases 3 18 Displaying Magnified Sweeps 3 19 Using the X10 Magnifier 3 19 Displaying Two Channels 3 20 Comparing Two Signals 3 20 Adding Tvyq S...

Страница 9: ...n SAVE REF Memory 3 41 Recalling a Waveform from SAVE REF 3 42 Comparing Saved Waveforms 3 42 Saving and Recalling Setups 3 42 Saving a Setup 3 42 Recalling a Setup from Memory 3 43 Recalling a Power Up State 3 43 Transmitting Waveforms 3 45 Communicating via Interface Options 3 45 Plotting or Printing a Waveform 3 46 Appendices Appendix A Options and Accessories A 1 Options A 1 Standard Accessori...

Страница 10: ...rocedure A 28 Vertical System Checks A 28 Horizontal System Checks A 37 Trigger System Checks A 43 External Z Axis Probe Adjust External Clock and X Y Plotter Checks A 49 Appendix D Storage Modes A 53 Glossary and Index Glossary G 1 Index 1 1 W 2221A User Manual ...

Страница 11: ...16 Figure 2 13 Trigger Controls Cont 2 18 Figure 2 14 Cursor Controls 2 20 Figure 2 15 Acquisition Controls 2 21 Figure 2 16 Save Reference Memory Buttons 2 22 Figure 2 17 1K Two Channel Acquisition Memory Location 1 2 23 Figure 2 18 4K Two Channel Acquisition Memory Location 4K 2 23 Figure 2 19 Setup Buttons 2 25 Figure 2 20 Setup Menu Example Display 2 26 Figure 2 21 Acquisition M enu 2 26 Figur...

Страница 12: ...riggered in TV Field 3 29 Figure 3 29 Measuring with the CRT Graticule 3 31 Figure 3 30 Cursor Measurements 3 32 Figure 3 31 Peak to PeakMeasurement 3 33 Figure 3 32 DC Component of AC signal 3 34 Figure 3 33 Ground Referenced Voltage Measurement 3 34 Figure 3 34 Measuring DC Levels with Cursors 3 35 Figure 3 35 Period Measurement 3 36 Figure 3 36 Cursor Frequency Measurement 3 37 Figure 3 37 Meas...

Страница 13: ...le A 5 Environmental Characteristics A 22 Table A 6 Physical Characteristics A 23 Table A 7 Test Equipment Required A 26 Table A 8 Deflection Accuracy Limits A 30 Table A 9 Storage Deflection Accuracy A 31 Table A 10 Settings for Bandwidth Checks A 33 Table A 11 Settings for Timing Accuracy Checks A 39 Table A 12 Switch Combinations for Triggering Checks A 44 Table A 13 Storage Modes A 53 2221A Us...

Страница 14: ...X 2221A User Manual ...

Страница 15: ...lab and portable applications Combination analog and digital oscilloscope 100 MHz maximum analog bandwidth 100 Megasamples sec digital sampling rate Multiple storage acquisition modes including glitch capture as narrow as 10 ns Cursor measurement and digital readouts Waveform storage and retrieval X Y Plotter output Optional RS 232 or GPIB communication interfaces 2221A User Manual xi ...

Страница 16: ...xii Product Description ...

Страница 17: ...I w a r n in g statements identify conditions or practices that could result in personal injury or loss of life These two terms appear on equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equip ment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking This symbol...

Страница 18: ...als of the oscilloscope Without the protective ground connection all parts of the 2221A are potential shock hazards This includes knobs and controls that may appear to be insulators Use the Proper Power Cord Use only the power cord specified for your product Use only a power cord that is in good condition Use the Proper Fuse To avoid fire hazard use only the fuse specified in the parts list for yo...

Страница 19: ...torage Oscilloscope perform the following steps 1 Step 1 Connect the proper power cord to the back of the instrument as shown below in Figure 1 1 Line Fuse Screw Figure 1 1 Installing the Power Cord Step 2 Check that you have the proper power supply for the instru ment The 2221A requires a line source that is 90 to 250 VAC with a frequency of 48 Hz to 440 Hz 2221A User Manual 1 3 ...

Страница 20: ...icates the power is on The instrument automatically runs a complete diagnostic check of the digital system If any diagnostic failures occur they will appear on screen Contact your service representative if you encounter a problem Pressing the POWER button again toggles the switch and turns off the power Initial Setup This section will help you set up the oscilloscope for use and allow you to becom...

Страница 21: ... the previous setup Figure 1 2 shows how the display should now appear Figure 1 2 Initial Setup Display Use the following procedure to align the baseline trace parallel with the center horizontal graticule line f l Step 1 Turn the Channel 1 POSITION control to position the trace on the center horizontal graticule line I Step 2 Using a small blade screwdriver adjust the recessed TRACE ROTATION cont...

Страница 22: ... match the attenuation factor of the probe The 10X probes supplied with the oscilloscope already have the proper coding SteP 3 Clip the probe tip to the PRB ADd connector f Step 4 Use the VOLTS DIV control to display about 5 divisions of the waveform Step 5 Use the VERTICAL POSITION and HORIZONTAL POSITION controls to center the display F I Step 6 Check the waveform against Figure 1 3 to see if th...

Страница 23: ...ormation about the probe and probe compensation Installing the Accessory Pouch Figure 1 4 shows the correct method of installing the accessory pouch on the instrument C Bow the Plate and Slide it into the Front Trim Gap Figure 1 4 Installing the Accessory Pouch 2221A User Manual 7 7 ...

Страница 24: ...Figure 1 5 shows how to wrap the power cord on the back when you trans port or store the instrument ouir i u p Using the Power Cord Wrap Figure 1 5 Using the Power Cord Wrap 1 8 Before You Begin ...

Страница 25: ... divided into functional sections Each functional sec tion is highlighted in Figure 2 1 CRTDisplay Controls Cursor Controls Display Mode page 2 8 page 2 20 Select Button Figure 2 1 Front Panel Control Sections Figures 2 2 and 2 3 show the front panel of the oscilloscope in greater detail 2221A User Manual 2 1 ...

Страница 26: ...Front Panel CRT Display Figure 2 2 Front Panel View Left Side 2 2 At a Glance ...

Страница 27: ...Front Panel f Display Mode Store digital Non Store analog Vertical Controls Horizontal Controls Trigger Controls Figure 2 3 Front Panel View Right Side 2221A User Manual 2 3 ...

Страница 28: ...Panel POWGT Switch The Power switch is shown in Figure 2 4 ON POWER OFF Figure 2 4 Power Switch POWER The push button switch turns the power on and off A green Sight indicates the power is on 2 4 At a Glance ...

Страница 29: ...ents The settings of the volts division and seconds division controls determine the scale of the graticule T o TTi FTala c l nssss rs c O O 0 I 0 O i j H i llllliiiilliP o 6 1 S T to LJ3i_ _1 i A l J Percent Markings are for rise time measurements Each major division is split into 5 minor divisions One minor division equals two tenths 2 of a major division Figure 2 5 CRT Graticule 2221A User Manua...

Страница 30: ...6 and the digital STORE mode Figure 2 7 The STORE NON STORE button selects the display mode s V j 0 GjgLo 1 O o JEj J C D 1 x S Jtdt Trigger Level STORE NON STORE 1 TR G1 30m O J 1 1 I i i 58n iU 18m U i 811m s A A CHI CH 2 Volts Div SectDiv Figure 2 6 Analog NON STORE Mode Display 2 6 At a Glance ...

Страница 31: ... appears above the Trigger Level volts symbol when the COUPL switch is set to LF REJ or when input coupling is set to AC Precedes the voits division readout if the input coupling is set to GND Replaces the A symbol in the A volts readout when making ground ref erenced voltage measurements c Indicates a compressed 4K record Replaces the volts symbol V whenever the volts division variable CAL is in ...

Страница 32: ...Front Pane CRT Display Controls I he display controls Figure 2 8 adjust the alignment intensity and focus of the waveform displays and readout information Figure 2 8 CRT Display Controls 2 8 At a Glance ...

Страница 33: ...rizontal graticule Use a small screwdriver to adjust the recessed control 3 INTENSITY STORE READOUT Adjusts the intensity of the entire STORE display as well as NON STORE readouts 4 GRATICULE Controls graticule illumination 5 FOCUS Focuses the display 6 BEAM FIND Locates dim or off screen displays 2221A User Manual 2 9 ...

Страница 34: ...Front Panel Vertical Controls and Figures 2 9 and 2 10 show the vertical controls and connections Connections 2 3 Figure 2 9 Vertical Controls and Connections 2 10 At a Glance ...

Страница 35: ...H 2 switch is in BOTH ADD Displays the sum of Channel 1 and Channel 2 signals Displays the difference between Channel 1 and Channel 2 with Channel 2 INVERT pushed in ALT Alternate Alternates the sweep between Channel 1 and Channel 2 display CHOP Electronically switches the sweep display between Channel 1 and Channel 2 at a rate of 500 kHz 6 INVERT Vertically inverts the Channel 2 signal 7 VOLTS DI...

Страница 36: ...rrom ranei Vertical Controls and Connections Cont Figure 2 10 Vertical Controls and Connections Cont 2 12 At a Glance ...

Страница 37: ...ouples the signal input and connects the vertical system to ground reference DC Passes all signal components to the vertical and acquisition systems 14 VOLTS D1V Channel 1 Volts per division Selects the vertical scale factor for Channel 1 Also vertically expands or compresses Channel 1 saved waveforms 15 CAL Channel 1 Calibrated The clockwise position provides calibrated volts division settings Ro...

Страница 38: ...Front Panel Horizontal Controls The horizontal controls are shown in Figure 2 11 1 Figure 2 11 Horizontal Controls 2 14 At a Glance ...

Страница 39: ...STORE pulling the knob out horizontally magnifies by ten times one division area of the display centered around the active cursor CAL In NON STORE rotating the control counterclockwise variably decreases the sweep speed The clockwise position selects calibrated settings In STORE rotating the control counterclockwise horizontally compresses 4K acquisitions to 1K 4 X I0 STORE ONLY Slows the STORE sw...

Страница 40: ...Front Panel Trigger Controls Figure 2 12 and Figure 2 13 illustrate the trigger controls N N 2 3 4 5 Figure 2 12 Trigger Controls 2 76 At a Glance ...

Страница 41: ...e trigger point regardless of the trigger signal amplitude The oscillo scope does not automatically sweep without an adequate trigger signal This mode is useful for low frequency or iow repetition rate signals In STORE the last signal acquired is displayed until the next trigger occurs TV FIELD Press P P AUTO and NORM in at the same time This mode sets the oscilloscope to trigger on television fie...

Страница 42: ...Front Panel Trigger Controls Cont g o gai O E O OG o 1 O r S 1 rh O o 1 i 1 1 3 N N N s 9 8 7 6 Figure 2 13 Trigger Controls Cont 2 18 At a Glance ...

Страница 43: ...the Channel 1 and Channel 2 In ALT the trigger source alter nates between the channels in sync with the display CH 1 Selects only the signal in channel 1 as the trigger source regardless of the vertical mode selected CH 2 Selects only the signal in channel 2 as the trigger source EXT External Uses the signal applied to the EXT INPUT connector as the trigger signal 8 LEVEL Selects the voltage level...

Страница 44: ...em values in the ACQ and REF Setup menus SELECT C1 C2 PUSH Pushing the CURSORS knob selects the cursor to position The cursor is enclosed by a box when selected 2 SELECT WAVEFORM Selects the waveform on which the cursors appear if one or more reference memories are displayed The symbol under the SREF location read out indicates that the cursors are on this particular reference memory dis play The ...

Страница 45: ...ODE Selects the desired acquisition mode directly without using the acquisition menu Refer to Digitizing Signals page 3 8 3 TR Q pQS Trigger Position Selects the acquisition record displayed relative to the trigger position indicated by a T on the waveform pretrigger midtrigger or posttrigger 4 SAVE CONT Save or continue SAVE temporarily freezes and displays the current acquisition record CONT con...

Страница 46: ... buttons to save up to three separate displays acquired in the 1K mode memory locations 1 2 or 3 or one dis play acquired in 4K mode memory location 4K Refer to Figure 2 17 and Figure 2 18 To save a waveform display press the SAVE REF button first and then one of the memory location buttons within five seconds The waveform display will be saved to that memory location To turn the reference memory ...

Страница 47: ...n 1 The H underneath 1 indicates the cursors are on this memory display Figure 2 17 1K Two Channel Acquisition Memory Location 1 Indicates SAVE REF Memory location 4K Figure 2 18 4K Two Channel Acquisition Memory Location 4K 2221A User Manual 2 23 ...

Страница 48: ...2 24 At a Glance ...

Страница 49: ...ACQ Acquisition Menu DISPLAY Display Menu REF Waveform Reference Menu PLOT Plot Menu ADV FUNCT Advanced Functions Menu Menu Item Select Buttons When a Setup menu is displayed each bezel button located underneath the displayed menu moves a box to select from the menu items that appear directly above the button For example pressing the DISPLAY setup button brings up the Display Menu Figure 2 20 Pres...

Страница 50: ...ET ON JP ACQ Button to exit i i t i L inh a i s j Cursor Hnob X my TuijfT I 1Z O 1r sets Av 3Wgt 1A1 Peakdel 1 t w 1 p UrirN j Liftlit Average A I n n a i r f Z R lf Slow oSampie Scan Fspt Re De set fault Cl v irsor Acq Mode s c i T T i r J O Ext Cldck Ac Me P des Kt Fl iuu j me i f SAVE REF Q v___ 1 2 n u n F F 3 _ Figure 2 21 Acquisition Menu Acq Mode Peakdet Peak Detect Detects spikes or giitch...

Страница 51: ...y the seconds division control Scan Is only available for settings of 0 1 s to 5 s Ext Clock Externa Clock Selects the slow Roil Scan mode or Fast Record mode for an external acquisition clock signal applied to the auxiliary con nector on the left side of the instrument Reset Default Acq Modes Reset Default Acquisition Modes Resets the Acquisition Menu selections to factory default conditions Curs...

Страница 52: ...t 1 M T Display frequency measurement Smooth Uses a digital process to smooth the waveform display yet retain the glitch catching capabilities of Peak Detect or Accumulate Peak acquisition modes Smooth applies only to the Peak Detect or Accumulate Peak modes Vector ON Connects data points together with vector lines in ad acquisition modes OFF Displays only the data points in all acquisition modes ...

Страница 53: ...alog X Y Plotter or digital plotter output format The digital output format requires a GPIB or RS 232 option XY Analog X Y plotter HPGL Hewlett Packard Graphics Language EPS7 Epson low speed EPS8 Epson high speed double density TJET Hewlett Packard ThinkJet Grat ON Plots graticule lines OFF Suppresses graticule lines Auto Plot ON Automatically plots acquisitions The graticule and readouts are plot...

Страница 54: ... exit I s ptupl Ful Setup Enrpty t I 1 y 1 t j i i o j t 1 _ j saye j J f Dfa j Me g ruqm m j setup j Fact nu Menu Mesnu j Reset 1 T f j r 1 j p f SAVE REF Q v i ON OfF 3 1 Figure 2 24 Advanced Functions Menu Diag Menu Diagnostic Menu Selects diagnostic tests and calibration aids used to service the instrument Detailed menu information is contained in the 2221A service manual Comm Menu Communicati...

Страница 55: ...Save Setup Menu Pwr Up State Power Up State Selects one of the following settings for the oscilloscope when the power is turned on Default The oscilloscope uses the factory default settings at power up Pwr Dwn Power Down The oscilloscope automatically saves the ac quisition and menu settings when the power is turned off The instrument will return to these settings when the power is turned back on ...

Страница 56: ... otnujj ivicnus Recall Setup Recalls the indicated Select Setup memory Save Setup Saves the current software controlled settings to the indicated Select Setup memory 2 32 At a Glance ...

Страница 57: ...onnection and an input coupling switch Figure 3 1 Figure 3 1 Input Connection and Coupling Switch Connecting Signals Use either a probe or coaxial cable to connect a signal to a vertical input Be careful to observe the maximum input voltage rating 400 Vpeak Use a high voltage probe if necessary For AC signals that have a DC level higher than ten times the volts division setting use the precharging...

Страница 58: ...gnal input to match the characteristic impedance and preserve the fidelity of the signal Tektronix also carries a variety of coaxial cable and cabling accessories for various applications Coupling Signals Use the AC GND DC switch to select the desired input coupling mode Figure 3 1 AC Capacitively couples the input and blocks DC to 10 Hz signals GND Decouples the signal from the input and connects...

Страница 59: ... front pane controls to get a sweep on the screen before you try to apply a signal With a simple trace on screen you can adjust the display intensity and focus before you make any other set tings If you are unfamiliar with oscilloscopes you may want to begin with the basic analog setup given in Start Up page 1 4 in addition the following sections describe the basic controls and a general approach ...

Страница 60: ...ADY P P AUTO NORM m i 1 TV F IE L D TRiG D S Selecting the Trigger Mode Set the trigger mode to P P AUTO for most routine displays This mode automatically adjusts the range of the trigger level control for repetitive signals above 20 Hz and automatically generates a sweep in the absence of an adequate trigger signal There are many other ways to trigger a signal Refer to the section entitled Trigge...

Страница 61: ...cal scale position and mode I Step 1 Select the channel you want with the CHI BOTH CH2 switch C H I Displays Channel 1 only BOTH Activates the ADD ALT CHOP switch for two channel displays CH 2 Displays Channel 2 only n Step 2 Preset the input coupling for that channel to ground GND Also refer to Precharging the Signal input page 3 2 2221A User Manual 3 5 ...

Страница 62: ...vailable from Tektronix If a probe is properly coded the display readout of the channel it is connected to will change by the appropriate scale factor T i T t r 1 1 I i i t T i 1 1 I t 1 1 T I i it VOLTS DIV r C H1 B O T H C H2 __E J CH 1 VOLTS DIV 1GX Figure 3 3 Vertical Display Controls I 1 Step 4 Apply the signal to the input and move the coupling switch to AC or DC Refer to Applying a Signals ...

Страница 63: ...e and then back to the normal level Some readouts do not appear in both STORE and NON STORE modes Refer to Display Mode page 2 6 The FOCUS control adjusts the clarity of the display Finding Lost Displays Because of signal variances or misadjusted front panel settings it is not uncommon to lose a signal display When this happens use the following procedure Step 1 Note which channel the signal is ap...

Страница 64: ... a normal level and adjust the vertical and horizontal scale with the VOLTS DiV and SEC DIV controls If you fail to locate the sweep using this procedure you may want to use the basic analog setup given in the Start Up page 1 4 and try reapplying the signal to the input Digitizing Signals There are four different acquisition modes to choose from when you digitize a signal in the STORE mode Accumul...

Страница 65: ...UISITION switches Selecting the High Speed Storage Mode The Repetitive Store mode is indicated on the front panel for time base settings of 0 5 ps and faster Because of the sampling rate 100 Ms s the oscilloscope must make numerous acquisitions at these speeds to complete a waveform record The Repetitive Store mode therefore should only be used when acquiring repetitive signals Selecting Slow Spee...

Страница 66: ...or slowly occurring continuous events when no trigger is desired Triggered Roll SGL SWP The record moves across the screen continuously from right to left When the trigger event occurs the oscillo scope retains the waveform on screen and disables further acquisitions Triggered Roll is useful for capturing an intermittent event and saving it on screen until the trigger is manually rearmed Refer to ...

Страница 67: ...to right with a trigger event Each new trigger event then causes the acquisition to overwrite the previous record from left to right Untriggered Roll Mode View a series of events or slowly occurring continuous events f l Step 1 Set the Trigger Mode to P P AUTO or NORM n Step 2 Press the Setup ACQ button to call up the Acquisition Menu I I Step 3 Select Roil and press the ACQ menu button again to e...

Страница 68: ...s the ACQ menu button again to exit the menu f l Step 5 Press the SGL SWP button Note that the trace moves across the screen continuously from right to left Also the READY light is on indicating the oscilloscope is waiting for a trigger signal If the READY light is not on press the SGL SWP button again When the trigger event occurs the acquisition continues across the screen from right to left unt...

Страница 69: ... Signal Peaks ACCPEAK Acquiring signals in ACCPEAK Figure 3 8 is the best mode to use when you want to observe the upper and lower boundaries of a signal s amplitude over time It will also indicate how much the DC component of the signal drifts or the amount of noise present in the signal Figure 3 8 Accumulate Peak Mode Display Detecting Signal Glitches A signal glitch is an aberrant spike that is...

Страница 70: ...The AVERAGE mode Figure 3 10 is excellent for visually eliminating ran dom signal noise that rides on the waveform Acquisitions are averaged over multiple records The default weight of one acquisition is but it may be changed using the ACQUISITION menu Figure 3 10 Average Mode Display Sampling Signals When you select SAMPLE the special features of the other modes are not used The acquisition displ...

Страница 71: ... additional screens in the 4K mode you must use the cursor knob P I Step 1 Press the ACQUISITION 1K 4K button In the 4K mode an acquisition window indicator will appear The acquisition window indicator Figure 3 12 displays the relative position of the cursors what cursor is active what part of the acquisition is displayed display window indicator and the trigger point n Step 2 Position the active ...

Страница 72: ... Step 2 Turn the X I0 CAL knob counterclockwise Note that the timing increases by a factor of four the small letter c appears before the time base readout and the signal is compressed Figure 3 14 aUI 5 j6U TR g ix 0U 1 1 88s 3M r 1 H 3 tt H i IL I n H i RpR ttiyi h m i i eu J L PEO KDfl t i i Figure 3 13 4K Acquisition IK Window aUT 5 6U TR G1 jl 0U l T 1 S8s SPu r X M m r i L i i i 2U js I PEA K ...

Страница 73: ...abeled TRIG POS moves the trigger point indica tor T to select three different views of the record Pretrigger Figure 3 15 Midtrigger Figure 3 16 Posttrigger Figure 3 17 A U 1 j 0i I0U T R 61 D 0U Z 1 0 0ii S I j f 1 j Lj l 1 d_ y i 1 ii j H I j I 2u P E PSCDI T 50 a5 1 Figure 3 15 Pretrigger Acquisition Figure 3 16 Midtrigger Acquisition 2221A User Manual 3 17 ...

Страница 74: ... Step 3 Turn the CURSORS knob to set the trigger point to the desired location The 4K acquisition mode extends the acquisition record and the cursor knob adjusts which portion of the record is displayed Refer to Selecting the Acquisition Record Length 1K 4K page 3 15 Preventing Signal Aliases Aliasing may occur in the digital mode because the oscilloscope cannot sample the signal fast enough to co...

Страница 75: ...re a couple of ways to horizontally magnify the sweep Change the time base to a faster sweep speed Use the XI0 control to magnify by ten times the center one division of the NON STORE display or one division centered around the active cursor in the STORE mode The XI0 magnifier also extends the upper range of sweep speeds for example 05 ps to 5 ns per division Using the X I0 Magnifier The time per ...

Страница 76: ...i 1 Step 2 Move the ADD ALT CHOP switch to ALT or CHOP In general it is better to use CHOP when the SEC DtV control is set in the millisec ond ms range and ALT when the SEC DIV is in the microsecond ps range Step 3 Position both signals on screen and adjust the vertical and horizontal scales Adding Two Signals D Step 1 Connect one signal to Channel 1 and the other signal to Chan nel 2 Move the CH1...

Страница 77: ... both the Channel 1 and Channel 2 POSITION controls Channel 1 signal with undesired AC component Channel 2 with undesired AC component inverted Channel 1 and Channel 2 invert in the ADD Mode Undesired AC component is canceled Figure 3 19 Rejecting Common Mode Signal 2221A User Manual 3 21 ...

Страница 78: ...ou want the amount of signal displacement to be exactly the same you may have to adjust the VOLTS DIV CAL variable controls Step 3 Press the X Y button in The signal in Channel 1 now drives the horizontal or X axis of the display and Channel 2 drives the vertical or Y axis When using the X Y mode measuring the precise phase and frequency differences between the signals requires a little more skill...

Страница 79: ...nships Frequency of the signal applied to Xaxis is twice that of the signal applied to the Yaxis Frequency of the signal applied to Yaxis is twice tilat of the signal applied to the Xaxis Figure 3 22 X Y Frequency Relationships 2221A User Manual 3 23 ...

Страница 80: ...intensity may be modulated with an external signal ap plied to the External Z Axis connection Figure 3 23 located on the rear panel of the oscilloscope Certain specifications of the instrument must be observed Refer to the Z Axis section of Specification Appendix B CAUTION TOAVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR MUST BECONNECTED TOGROUND EXTZAXIS INPUT 10KA POSITIVE GO...

Страница 81: ...he display The P P AUTO mode is the easiest mode to use for repetitive signals because it automati cally adjusts the range of the trigger level control and generates a sweep when no trigger signal is present f 1 Step 1 Apply the repetitive signal to the Channel 1 input connector I Step 2 Set trigger mode to P P AUTO P I Step 3 Set the vertical mode to Channel 1 and the trigger SOURCE to VERT MODE ...

Страница 82: ...URCE to VERT MODE The trigger signal is obtained from the signal applied to the selected channel in this case Channel 1 Step 4 Set the COUPL switch to NORM StepS Adjust the TRIGGER LEVEL and VAR HOLDOFF if necessary to stabilize the display StepS Adjust the vertical and horizontal controls to display a few cycles of the waveform 1 Step 7 Set the oscilloscope to STORE mode Figure 3 25 Note that the...

Страница 83: ...scope in STORE Step 5 Move the CHI BOTH CH2 switch to BOTH Step 6 Move the ADD ALT CHOP switch to ALT or CHOP In general it is better to use CHOP when the SEC DIV control is set in the millisec ond ms range and ALT when the SEC DIV is in the microsecond ps range Step 7 Position both signals on screen and adjust the vertical and horizontal scales aU 1 0 00V i TRIG 2 i 5U a T 0 0 0 u aU2 8 88U I 1 L...

Страница 84: ... button Step 2 Apply the TV signal to a channel input and display the channel Step 3 Set the VOLTS DIV switch to display 0 3 or more of composite video signal P I Step 4 Set the SEC DIV switch to 10 ps P I Step 5 Set the TRIGGER SLOPE switch either out for positive going TV Signal sync pulses or in for negative going TV signal sync pulses Step 6 Adjust the TRIGGER LEVEL stabilize the display Figur...

Страница 85: ...Set the SEC DIV switch to a faster sweep speed displays of less than one full field This will synchronize the Channel 1 display to one field and the Channel 2 display to the other field a U I e 0 8 U i TRIG 1 5 R E F a 0 2 6 R U d T 0 J00m 1 i i i 1 I LO CD u P E A K D E T 2 b s Figure 3 28 Multi burst Signal Triggered in TV Field Removing Unwanted Trigger Signal Components Sometimes an unwanted h...

Страница 86: ...lopiayiiiij 3 30 In Detail ...

Страница 87: ...RT Graticule The graticule is a graph that you can change the vertical and horizontal scale factors The VOLTS DIV setting or readout indicates the vertical scale for each major division The SEC DIV setting or readout indicates the horizontal scale for each major division Each minor division represents two tenths 0 2 of the major division value Measuring with STORE Mode Cursors Cursor measurements ...

Страница 88: ...s of cursors with one active cursor apiece The active cursors of each pair track together when you move the cursor knob When you have more than one waveform recalled from memory however you must use press the SELECT WAVEFORM button to move the cursors from one waveform to another Measuring Voltage Make amplitude or other vertical measurements between two points on a waveform using this basic proce...

Страница 89: ... ing on whether you use graticule lines or cursors to measure the DC level Graticule lines F I Step 1 Set the input coupling to GND and the trigger mode to P P AUTO to display a flat trace on screen 1 1 Step 2 Align the trace with a horizontal graticule line This line is now the ground reference point Step 3 Set the input coupling to DC P I Step 4 The amount of vertical offset is the DC component ...

Страница 90: ... 3 32 and Figure 3 33 Step 5 Position the other cursor to make the DC level measurement NOTE You may have to reset the coupling switch to ground in order to obtain the ground reference dot if you change a front panel control setting DC Component 690 volts Center of AC Signal Ground Reference Figure 3 32 DC Component of AC signal Measurement point figure 3 33 Ground Referenced Voltage Measurement 3...

Страница 91: ...o that the first point you wish to measure from is on screen l l Step 2 In NON STORE mode adjust the time base to place the other horizontal point on screen and use the graticule lines to make the mea surement or go to STORE mode and use the rest of this procedure n Step 3 In STORE mode position a cursor on the first point of the waveform with the cursor control 1 1 Step 4 Push the CURSORS knob in...

Страница 92: ...cy n Step 1 Press the Setup DISPLAY button on the front panel Step 2 Push the left bezel button to place the selection box around 1 AT Push the DISPLAY button again to return to the storage acquisi tion display F I Step 3 Position a cursor on the rising edge of the waveform where it crosses a graticule line F I Step 4 Push the CURSORS knob in to select the other cursor and position it at the same ...

Страница 93: ...all Time Rise time is a measure of the time between the 10 and 90 points on the leading edge of a waveform Figure 3 37 Fall time is a measure of time between the 90 and 10 points on the trailing edge of a waveform Fig ure 3 38 a UI 8 j 0 X 1 TRjG 1 3 8 41 1 0 2 5 ris 1 iSfiUE _ j I i V j i j i i fgl 1 1 y V J 8 js U s fiU F R flk 5 3ns Figure 3 37 Measuring Rise Time 2221A User Manual 3 37 ...

Страница 94: ...d over 4 or 5 divisions Refer to Displaying Magnified Sweeps page 3 19 F I Step 6 Measure the rise time horizontally from the 10 graticule line to the 90 graticule line Measuring Trigger Level The trigger level is the point on the rising or falling edge of a signal where the oscilloscope triggers a sweep This voltage level is indicated by the TRIG readout at the top of the CRT TRIG1 represents the...

Страница 95: ...display f l Step 6 Set the SEC DIV switch to a sweep speed that displays about one full cycle of the reference waveform f l Step 7 Position the displays and adjust the SEC DIV variable control so that one cycie of the reference signal occupies exactly 8 horizontal divisions Each horizontal division of the graticule now represents 45 of the cycle 360 8 divisions F l Step 8 Measure the horizontal di...

Страница 96: ...Measuring signals in XI0 Mag Channel 2 Channel 1 Reference Figure 3 40 Phase Difference in X I0 Magnification 3 40 In Detail ...

Страница 97: ...complete before it is saved F I Step 3 Copy the waveform to a SAVE REF memory location if you want to retain the waveform for later reference Refer to the following sec tion Step 4 Press the SAVE CONT button again to continue with normal acquisition Saving Waveforms in SAVE REF Memory In the I K acquisition mode you can save up to three waveform displays in SAVE REF memory In the 4K mode because o...

Страница 98: ...rm with another Step 1 Press one or more memory location buttons to display their respective contents IT Step 2 Press the SELECT WAVEFORM button next to the cursor control one or more times until the cursors appear on the waveform you want to measure An underscore appears under the selected SREF memory number at the top of the display Saving and Recalling Setups The oscilloscope can retain front p...

Страница 99: ...acquisition and menu settings previously saved to that memory location Recalling a Power Up State The osciiioscope can be configured to return to one of four setups when the instrument is turned on F I Step 1 Press the Setup ADV FUNCT button The Advanced Functions menu appears n Step 2 Press the button underneath Save Setup Menu f l Step 3 Press the button underneath Power Up State to select one o...

Страница 100: ...Saving Waveforms and Setups 3 44 En Detail ...

Страница 101: ...nstruments Only one interface can be installed in the instrument at a time The two interface options are depicted in Figure 3 42 and Figure 3 43 The 2221A 2224 2232 Optional GPIB RS 232 C Interfaces User Manual 070 8159 01 provides you with information about connecting the GPIB and RS 232 C communication options to external printers plotters or computer ports I AUXILIARY CONNECTOR 1 RELAYN 0 1 r R...

Страница 102: ...T S H I A H 1 T5 L3 S R I RL2 PRO DC1 DTO CO E2 Figure 3 43 GPIB Interface Option 10 The auxiliary connection Figure 3 44 is a standard feature on all instru ments The X Y and RELAY lines on the auxiliary connection allow you to drive an analog X Y plotter The section entitled X YPlotter Output in Appen dix B supplies technical information pertaining to these outputs mmA U X ILIA RY C O N N E C T ...

Страница 103: ...te fereiptet HPGL mSPST EPS8 ON _QL1 1 0 TJET o fc I OFF OFF moxiem Type Grat A U tO j A Y Plat Se up Start I I I 1 I i i I 1 j SAVE a e F CQ 1 2 O N O FF T 1 Figure 3 45 Plot Menu Plotter Type The Plotter Type menu button selects the analog X Y Plotter or digital plotter output format The digital output format requires a GPIB or RS 232 option XY Analog X Y plotter HPGL Hewlett Packard Graphics La...

Страница 104: ...y The oscilloscope will wait for each plot to finish before beginning another acquisition OFF Disables Auto Plot XY Setup XY Setup generates a pattern for calibrating analog X Y plotter gain and offset Start The Start menu button initiates transmission of the waveform display over the X Y plotter or communications option 3 48 In Detail ...

Страница 105: ...P1B Interface Option 10 provides a GPIB General Purpose Interface Bus communications interface The interface implemented conforms to the specifications con tained in IEEEStandard Digital interface for Programmable Instrumentation ANSI IEEE Std 488 1978 It also complies with a Tektronix Standard relat ing to GPIB Codes Formats Conventions and Features The 2221A 2224 2232 GPIB RS 232 C Optional Inte...

Страница 106: ...with Option 33 it comes equipped with the accessory pouch front panel cover shock absorbing rubber guards mounted on the front and rear of the cabinet an easy to use power cord wrap and a carrying strap The Travel Line option can be installed on existing instruments by ordering the Travel Line kit 040 1202 04 OPTION 3R Rackmount Option 3R allows you to mount the 2221A into a standard 19 inch equip...

Страница 107: ...7 01 Service Manual SN B02000Q and Above 070 8549 xx Rack Adapter 016 0833 01 Viewing Hood 016 0566 00 Carrying Strap 346 0199 00 Carrying Case 016 0792 01 Rain Cover 016 0848 00 Camera C9 Option 20 Portable Instrument Cart K212 QuickStart Training Aid U S 020 1812 04 QuickStart Training Aid International 020 1812 06 WaveSaver Software S41SAVE HCtOO Plotter HC100 Opt 03 RS 232 or HC100 Opt 01 GPiB...

Страница 108: ...Appendix A Options and Accessories Appendices ...

Страница 109: ...r division for both channels Variable VOLTS D1V gain control that increases the deflection factor at least 2 5 to 1for any VOLTS DIV setting of either channel a Vertical display modes CH 1 CH 2 and BOTH with a choice in BOTH of ADD ALT or CHOP Bandwidth limiting that reduces bandwidth of the vertical amplifier system and the trigger system to 20 MHz Horizontal System The horizontal system offers t...

Страница 110: ...or provides front panel control and feedback on control settings Front Panel Controls This oscilloscope uses a combination of front panel buttons knobs and on screen menus to control its many functions The front panel controls are grouped according to function vertical horizon tal trigger setup and acquisition Almost all NON STORE analog real time and STORE mode functions are set using front pane ...

Страница 111: ...fference and timing difference between the positions of the cursors For 4 K acquisition records the CURSORS knob also scrolls the record back and forth horizontally so any 1 K portion can be viewed on screen The screen can oniy display 1 K record points Options and Accessories For part numbers and information about both standard and optional acces sories refer to Options and Accessories which begi...

Страница 112: ...cs Characteristics Performance Requirements Vertical Deflection System Deflection Factor Range 2 mV per division to 5 V per division in a 1 2 5 sequence DC Accuracy NON STORE 15 C to 35 C 2 0 C to 50 C 3 1 For 5 mV per division to 5 V per division VOLTS DIV switch settings the gain is set at a VOLTS DIV switch setting of 10 mV per division 2 mV per division gain is set with the VOLTS DIV switch se...

Страница 113: ...IT 3dB 20 MHz 10 AC Coupled Lower Cutoff Frequency 10 Hz or less at 3 dB1 Step Response NON STORE Mode Rise Time 0 C to 35 C 5 mV per division to 5 V per division 3 5 ns or less 1 2 mV per division 4 4 ns or less 1 35 Cto 50 C 5 mV per division to 5 V per division 3 9 ns or less 1 2 mV per division 4 4 ns or less 1 Rise time is calculated from RiSe Vme Step Response STORE Mode 1 Useful Storage Ris...

Страница 114: ...seful Storage Performance2 RECORD SCAN and ROLL Store Modes SAMPLE Acquisition no AVERAGE 1 ps per division to Sing e Trace 5 s per division 10 SECIDIV setting CHOP ALT SECIDIV setting Hz EXT CLOCK up to 100 kHz EXT H 10 EXT j i 20 H PEAK DETECT Sine Wave 10 MHz1 Amplitude Capture 5 p p maximum amplitude uncertainty Pulse Width 10 ns Amplitude Capture 50 p p maximum amplitude uncertainty 1 2 1Perf...

Страница 115: ...efault weight is NON STORE CHOP Mode Switching Rate 500 kHz 30 A D Converter Linearity Monotonic with no missing codes1 Analog CH1 CH2 Delay Match 1 0 ns1 NON STORE Common Mode Rejection Ratio CMRR At least 10 to 1 at 50 MHz Checked at 10 mV per division for common mode signals of six divisions or less with the VOLTS DIV Variable control ad justed for the best CMRR at 50 kHz Input Current 1 nA or ...

Страница 116: ...ess1 Trigger System Trigger Sensitivity P P AUTO and NORM 10 MHz 60 MHz 100 MHz Internal 0 35 div 1 0 div 1 5 div Externa 40 mV 120 mV 150 mV External trigger signal from a 50 O source driving a 50 Q coaxial cable terminated in 50 Q at the input connector HF REJ Coupling Should not trigger with a one division peak to peak 250 kHz signal when HF REJ is ON Reduces trigger signal amplitude at high fr...

Страница 117: ...V 3 2 V p p EXT DC 10 At least 16 V 32 V p p 1 VAR HOLDOFF Control4 NON STORE Hoi doff Increases sweep hoidoff time by at least a factor of 10 Trigger Level Readout Accuracy 15 C to 4 35 C 0 3 division 5 of reading Applies to 10 divisions from zero volts Acquisition Window Trigger Points Pretrigger Seven eighths of the waveform acquisition window is prior to the trigger other trigger points are se...

Страница 118: ... in a 1 2 5 se quence of 22 steps 5 STORE Mode Ranges REPETITIVE 0 05 gs per division to 0 5 s per division 1 6 RECORD 1 gs per division to 50 ms per division 16 ROLUSCAN 0 1 s per division to 5 s per d i v i s i o n 1 NON STORE Accuracy Unmagnified Magnified 15 C to 35 C 0 5 s per division to 0 1 gs per division 2 3 0 05 is per division 2 4 0 C to 50 C 0 5 s per division to 0 1 gs per division 3 ...

Страница 119: ...setting SECIDIVsetting PEAKDET or ACCPEAK 1 ps per division to 5 s per division 100 MHz1 100 MHz1 REPETITIVE Store 0 05 ps per division to 0 5 ps per division 100 MHz1 100 MHz1 External Clock Input Frequency Slow DC to 1 kHz Fast DC to 100 kHz Digital Sample Rate 100 MHz in ACCPEAK and PEAKDET otherwise it is equal to the input frequency 1 Screen Update Rate Slow One data pair for every second fal...

Страница 120: ...h Extends each sweep speed by at least a factor of 2 5 times over the calibrated SEC D1V setting STORE Horizontal Variable Sweep has no affect on the STORE Mode time base Rotating the Variable SEC DIV control out of the CAL detent position horizontally compresses a 4 K point ac quisition record to 1 K points in length so that the whole re cord length can be viewed on screen Screen readout is al te...

Страница 121: ...n be positioned to the top and to the bottom of the graticule area Storage Display Expansion Algorithm Error 0 1 of full scale 1 Storage Display Compression Algorithm Error 0 16 of reading 0 4 of full scale 1 Horizontal Resolution 10 bits 1 part in 1024 1 Calibrated for 100 data points per division Differential Accuracy Graticule indication of time cursor difference is 2 of the readout value measu...

Страница 122: ...s Same as vertical deflection system with the VOLTS DIV Vari able controls in the CAL detent position NON STORE Accuracy8 X Axis T 150 C to 35 C 3 0 C to 50 C 4 1 Y Axis Same as vertical deflection system 1 NON STORE Bandwidth 3 dB 8 X Axis DC to at least 2 5 MHz Y Axis Same as vertical deflection system 1 NON STORE Phase Difference Between 3 degrees from DC to 150 kHz 1 X Axis and Y Axis Amplifie...

Страница 123: ...Only 5 V causes noticeable modulation Positive going input de creases intensity Usable frequency range is DC to 20 MHz Maximum Input Voltage A 30 V DC peak AC or 30 V p p at 1 kHz or less 1 Input Resistance Greater than 10 kO 1 X Y Plotter Output Maximum Safe Applied Voltage Any A Connector Pin A a 25 V DC peak AC or 25 V p p AC at 1 kHz or less 1 X and Y Plotter Outputs Pen Lift Down Fused relay ...

Страница 124: ...cm 1 Standard Phosphor P311 Nominal Accelerating Voitage 14 kV1 4 2 V Output 10 through 2 kQ 1 Memory Power Down Battery Voitage Memory retained for battery voltages greater than 2 3 V 1 Data Retention Memory maintained at ieast 6 months without instrument power 1 Battery Life Power down data retention specification shall be maintained for 3 years without battery change Power Down Detection Thresh...

Страница 125: ...n RS 232 C Requirements Complies with E1A Standard RS 232 C 1 Baud Rates Available Rates 110 300 600 1200 and 2400 baud 1 Accuracy 1 error 1 Performance requirement not checked in manual e C Q_ 1 C O 10 k H z 50 kH z 1 00 k H z 5 0 0 k H z 1 M H z 100 M H z Figure A 1 Maximum input voltage versus frequency derating curve for the CH 1 OH X CH 2 OR Y and EXT INPUT connectors 2221A User Manual A 21 ...

Страница 126: ...rating To 15 240 meters 50 000 feet 1 Exceeds requirements of MIL T 2880D para 4 5 5 2 Humidity Operating and Nonoperating 5 cycles 120 hours referenced to M1L T 28800D para 4 5 5 1 2 2 for Type III Class 5 instruments Operating and nonoperating at 95 5 to 0 relative humidity Operat ing 30s Cto 50 C nonoperating 30 Cto 60 C 1 EMI eiectromagnetic interference Meets radiated and conducted emission r...

Страница 127: ...ooden bench surface 1 Meets requirements of MIL T 22800D para 4 5 S 4 3 Performance requirement not checked in manual Table A 6 Physical Characteristics9 Characteristics Performance Requirements Weight With Power Cord Cover Probes and Pouch 9 4 kg 20 7 lb With Power Cord Only 8 2 kg 18 lb Domestic Shipping Weight 12 2 kg 26 9 lb Height 137 mm 5 4 in Width With Handle 360 mm 14 2 in Without Handle ...

Страница 128: ...Appendix B Specification Figure A 2 Physical dimensions of the 2221A Digital Storage Oscilloscope A 24 Appendices ...

Страница 129: ...subjected to harsh environ ments or severe usage Structure The Performance Verification is structured in subparts to permit checking individual sections of the instrument whenever a complete verification of performance is not required Each subpart begins with a list of the test equipment required for performing the steps in that subpart Following that equipment list is a list of all the front pane...

Страница 130: ...tandard amplitude signal levels 5 mV to 50 V Accuracy 0 3 High amplitude signal levels 1 V to 60 V Repetition rate 1 kHz Fast rise signal level 1 V Repetition rate 1 MHz Rise time 1 ns or less Flatness 2 Signal source for gain and transient response TEKTRONIX PG 506A Calibration Genera tor 1 Leveled Sine Wave Generator Frequency 250 kHz to above 100 MHz Output amplitude variable from 10 mV to 5V p...

Страница 131: ...nectors BNC femaie to BNC female Signal intercon nection Tektronix Part Number 103 0028 00 T Connector Connectors BNC Signal intercon nection Tektronix Part Number 103 0030 00 Termination impedance 50 Q Connectors BNC Signal termination Tektronix Part Number 011 0049 01 Termination Impedance 600 Cl Connectors BNC Signal termination Tektronix Part Number 011 0092 00 10X Attenua tor Ratio 10X Impeda...

Страница 132: ...CUS and Trigger LEVEL control as needed to view the display when performing procedures Before doing the procedures that follow perform these four steps to ensure performance accuracies for the digital portion of the instrument Perfor mance of the Factory Reset routine sets the digital part of the instrument to factory default settings Procedure Steps F I Step 1 Power on the instrument and allow it...

Страница 133: ...rage STORE NON STORE NON STORE button out Procedure Steps P I Step 1 Check Deflection Accuracy and Variable Range a Connect the standard amplitude signal from the calibration genera tor via a 50 Q cable to the CH 1 OR X input connector b CHECK Deflection accuracy is within the limits given in Table A 8 for each CH 1 VOLTS DiV switch setting and corresponding stan dard amplitude signal When at the ...

Страница 134: ...t b using the CH 2 controls Step 2 Check Store Deflection Accuracy a Set CH 2 VOLTS DiV 2 mV STORE NON STORE STORE button in Acquisition MODE AVERAGE b Set the generator to produce a five division standard amplitude signal c Use the CURSORS control and SELECT C1 C2 switch push in the CURSORS controls knob to set one cursor at the bottom of the square wave and the other cursor at the top of the squ...

Страница 135: ... 20 V 3 92 to 4 08 19 40 to 20 60 V SteP 3 Check Save Expansion and Compression a Set the CH 1 VOLTS DiV switch to 0 1 V b Set the generator to produce a 0 5 division standard amplitude signal c Press in the SAVE CONT button to select SAVE d Set the CH 1 VOLTS DIV switch to 10 mV and reposition the display e CHECK The display is expanded to five divisions in amplitude f Set CH 1 VOLTS DIV 0 1 V SA...

Страница 136: ... the waveform is positioned at least 1 division below the center horizontal graticule line Move the cable from the CH 2 input connector to the CH 1 input connector and set the Vertical MODE switch to CH 1 Repeat parts d through h using the Channel 1 controls l 1 Step 5 Check Acquisition Position Registration a Set b AC GND DC both GND SEC DIV 0 5 ms Position the trace exactly on the center horizon...

Страница 137: ...ion to the CH 1 OR X input connector c Set the generator to produce a 50 kHz six division display d CHECK Display amplitude is 4 2 divisions or greater as the gener ator output frequency is increased up to the value shown in Table A 10 for the corresponding VOLTS DIV switch setting Table A 10 Settings for Bandwidth Checks VOLTS DIV Generator Switch Setting Output Frequency 2 mV 80 MHz 5 mV to 0 5 ...

Страница 138: ...select SAVE g CHECK The 100 MHz display is saved h CHECK Display amplitude is 4 2 divisions or greater i Press in the SAVE CONT button to select CONT j Set the Vertical MODE switch to BOTH and ALT k Repeat parts 1through h I Step 8 Check Single Sweep Sample Acquisition a Set Vertical MODE SEC DIV X I0 Magnifier Trigger Mode SOURCE SAVE CONT b Set the generator to produce c Press in the Trigger Mod...

Страница 139: ...ent F I Step 10 Check Common Mode Rejection Ratio b Connect the leveled sine wave generator output via a 50 Q cable a 50 Q termination and a dual input coupler to the CH 1 OR X and the CH 2 OR Y input connectors c Set the generator to produce a 50 MHz six division display d Vertically center the display using the CH 1 POSITION control Then set the Vertical MODE switch to CH 2 and vertically center...

Страница 140: ... generator output via a 50 O cable and a 50 Q termination to the CH 1 OR X input connector c Set the generator to produce a 50 MHz five division display d Set the Vertical MODE switch to CH 2 e CHECK Display amplitude is 0 05 division or less 1 f Move the cabie from the CH 1 OR X input connector to the CH 2 OR Y input connector g Set Vertical MODE CH 1 i i CH 1 AC GND DC GND CH 2 AC GND DC DC t h ...

Страница 141: ...enerator period to 1 ms f Set SEC DIV to 1 ms g Set STORE NON STORE STORE button in Acquisition MODE PEAKDET h Adjust Horizontal POSITION control to center trace horizontally i CHECK The amplitude of the display is 2 5 divisions or greater j Set the SEC DIV switch to 0 1 sec k CHECK The amplitude of the display is 2 5 divisions or greater l Disconnect the test equipment from the instrument Horizon...

Страница 142: ...zontal POSITION control to align the 2nd time marker with the 2nd vertical graticule line e CHECK Timing accuracy is within 2 0 16 division at the 10th vertical graticule line and linearity is within 5 0 1 division over any 2 of the center eight divisions f Repeat parts c through e for the remaining SEC DIV and time mark generator setting combinations shown in Table A 11 under the Normal XI column...

Страница 143: ... the X I0 Magnified column Table A 11 Settings for Timing Accuracy Checks Time Mark Generator Setting SEC DIV Switch Setting Normal XI X I0 Magnified 0 05 M S 50 ns 10 ns 0 1 M S 0 1 M s 10 ns 0 2 ps 0 2 M S 20 ns 0 5 M S 0 5 M S 50 ns 1 ps 1 M S 0 1 M S 2 ps 2 M S 0 2 M S 5 ps 5 M S 0 5 M S 10 ps 10 M S 1 M S 20 M s 20 M S 2 M S 50 ps 50 M S 5 M S 0 1 ms 0 1 ms 10 M S 0 2 ms 0 2 ms 20 M S 0 5 ms ...

Страница 144: ...Select 0 1 ms time markers from the time mark generator Align the 2nd time marker with the 2nd vertical graticule line using the Horizontal POSITION control Press in the SAVE CONT button to select SAVE for a stable display Use the CURSORS control and SELECT C1 C2 push in the CUR SORS control knob switch to set the first cursor on the trailing edge of the 2nd time marker Press in the CURSORS contro...

Страница 145: ...ned to the left of the center vertical graticule line by rotating the Horizontal POSITION controi fully counterclockwise e Select 50 ps time markers from the time mark generator f Align the 3rd time marker with the center vertical graticule line using the Horizontal POSITION control g Set the X10 Magnifier knob to On knob out h CHECK Magnified time marker can be positioned to the left of the cente...

Страница 146: ...two time markers per division over the center eight divisions n Step 7 Check Non Store Sweep Length a Set SEC DIV Variable CAL detent STORE NON STORE NON STORE button out b Use the Horizontal POSITION control to align the start of the sweep with the 1st vertical graticule line c CHECK End of the sweep is to the right of the 11th vertical grati cule line d Disconnect the test equipment from the ins...

Страница 147: ... the instrument Trigger System Checks Equipment Required see Table A 7 Calibration Generator Dual Input Coupler Leveled Sine Wave Generator 50 Q BNC Termination Low Frequency Generator 600 Q BNC Termination 50 0 BNC Cable 10X Attenuator Initial Control Settings Vertical Both Channels POSITION both Midrange MODE CH 1 X Y Off button out BW LIMIT Off button out CH 1 VOLTS DIV 5 mV CH 2 VOLTS DIV 50 m...

Страница 148: ...Switch Combinations for Triggering Checks Trigger Mode Trigger SLOPE NORM Positive NORM Negative P P AUTO Negative P P AUTO Positive e Set Vertical MODE CH 2 SOURCE CH 2 f Move the cable from the CH 1 OR X input connector to the CH 2 OR Y input connector g Repeat part d h Set SEC DiV 0 1 ps X I0 Magnifier On knob out i Set the generator to produce a 60 MHz 1 0 division display j Repeat part d k Se...

Страница 149: ...utput to produce a 250 kHz one division display d Adjust the Trigger LEVEL control for a stable display e Set the COUPL switch to HF REJ position f CHECK Stable display cannot be obtained by adjusting the Trigger LEVEL control for each switch combination given in Table A 12 on page A 44 f l Step 3 Check LF Reject Triggering a Set TriggerLEVEL Midrange COUPL NORM b Set the generator to produce a 25...

Страница 150: ... Set the generator output voltage to 120 mV and the frequency to 60 MHz g Repeat part d h Set the generator output voltage to 150 mV and the frequency to 100 MHz i Repeat part d f l Step 5 Check External Trigger Ranges a Set CH 1 VOLTS DIV SEC DIV X I0 Magnifier 0 5 V 20 ps Off knob in Trigger SLOPE Positive button out Trigger Mode NORM b Set the generator to produce a 50 kHz 6 4 division display ...

Страница 151: ...occurs f Press in the SGL SWP button several times g CHECK Single sweep trace occurs and the READY LED illumi nates briefly every time the SGL SWP button is pressed in and released h Disconnect the test equipment from the instrument f l Step 7 Check Acquisition Window Trigger Points a Set CH 1 AC GND DC GND Trigger Mode P P AUTO SEC DiV 0 1 gs STORE NON STORE STORE button in Acquisition 1K 4K 1k b...

Страница 152: ... AC GND DC DC Trigger Mode NORM f Set the generator to produce a five division standard amplitude signal g Adjust the Trigger LEVEL control for a stable display and center the waveform on the screen h Set the CH 1 VOL TS DIV switch to 10 mV for a 10 division display i Vertically position the top of the waveform display on the center horizontal graticule line j Set the Trigger SLOPE switch to Negat...

Страница 153: ...SEC DIV 20 gs SEC DIV Variable CAL detent X I0 Magnifier Off knob in Trigger VAR HOLDOFF NORM Mode P P AUTO SLOPE Positive button out LEVEL Midrange SOURCE Vertical MODE COUPL NORM EXT COUPL AC Storage STORE NON STORE NON STORE button out Procedure Steps I Stepl Check External Z Axis Operation a Connect the leveled sine wave generator output via a 50 O cable and a T connector to the CH 1 OR X inpu...

Страница 154: ...s TTL levels d Disconnect the cable from the CH 1 OR X input connector and connect it to the BNC maie to tip plug via BNC female to BNC female connector e Insert the BNC male to tip plug signal lead and ground lead into pin 1 EXT CLOCK and pin 6 SIG GND respectively of the X Y Plotter connector f Set the SEC DIV switch to 0 1 sec g Connect the Calibration Generator high amplitude output via a 50 O...

Страница 155: ...icule line Voltage reading of the Voutput will be negative below the center horizontal graticule line and positive above the center horizontal graticule line f Record the voltage reading as the instrument plots the 1st and the 10th graticule line as the intensity spot moves along the graticule line g CHECK The voltage difference between the 1st and 10th graticule line is between 4 0 V and 6 0 V h ...

Страница 156: ...Appendix C Performance Verification j f i f P P j r fe t E F E J E J E fer 4 52 Appendices ...

Страница 157: ... 5 ps div to 50 ms div or EXT CLK Fast Mode DC to 100 kHz 3 Any Slow Record PEAKDET ACCPEAK SAMPLE AVERAGE ON OFF 0 1 s div to 5 s div or EXT CLK Slow Mode DC to 1 kHz 3 NORM Triggered Scan4 PEAKDET ACCPEAK SAMPLE AVERAGE ON OFF P P AUTO Untriggered Scan4 PEAKDET SAMPLE ON OFF SGL SWP Scan roll Scan4 6 p p AUTO and NORM Roll5 SGL SWP Triggered Roll5 he default modes for Acquisition and Auto Vector...

Страница 158: ...Appendix u storage Modes A 54 Appendices ...

Страница 159: ...t sampling of high frequencies or fast transitions A condition that occurs when an oscillo scope digitizes at an effective sampling rate that is too slow to repro duce the input signal The waveform displayed on the oscilloscope may have a lower frequency than the actual input signal Alternate vertical A vertical mode of operation for a dual trace oscilloscope The oscillo scope makes a complete swe...

Страница 160: ...d rate Chop is generally used at sweep speeds slower than 0 5 ms div CRT An acronym for the display device of the oscilloscope Cathode Ray Tube Compensation In relation to oscilloscope probes compensation is the act of adjusting the resistive and capacitive components of the probe to offset undesir able characteristics of both the probe and the input channel Probe compensation ensures fidelity of ...

Страница 161: ... of the period Measured in Hertz Hz where 1 Hz 1 cycle per second Ground A connection or reference to the zero voltage potential of earth ground GPIB General Purpose Interface Bus An interconnection bus and protocol that allows you to connect multiple instruments in a network under the control of a controller Also known as IEEE 488 bus It transfers data with eight parallel data lines five control ...

Страница 162: ... leads or lags the other in time Phase is expressed in degrees where 360 comprises one complete cycle of one of the waveforms Waveforms measured should be of the same frequency or one waveform should be a harmonic of the other Probe An oscilloscope input device Quantizing The process of converting an analog input that has been sampled such as a voltage to a digital value Record length The specifie...

Страница 163: ...ed storage mode that updates the acquisition display left to right across the display at a rate determined by the time base setting Selected waveform The waveform on which cursor measurements are performed The symbol underscores the selected memory location indicated by 1 2 3 or 4K The symbol appears under the letter A when the waveform selected is the current acquisition Setup menus A group of re...

Страница 164: ...ine created by the storage mode display system of the oscilloscope that connects two data points Waveform The shape or form visible representation of a signal X Y A display mode that compares the voltage levels of two signals One signal drives the horizontal or X axis and the other signal drives the vertical or Y axis It is useful for studying phase relationships between two waveforms Z Axis The i...

Страница 165: ... 78 Alternate Current defined G 7 Alternate mode defined G 7 Amplitude defined G 7 Attenuation defined G 7 Automatic trigger mode defined G 2 Average mode when to use 3 14 B Bandwidth defined G 2 limiting 3 24 Bandwidth Limit 3 24 BEAM FIND button described 2 9 location 2 8 Bezei defined G 2 Bezel buttons defined G 2 Button POWER 1 4 2 4 STORE NONSTORE 2 6 BW LIMIT button described 2 11 located 2 ...

Страница 166: ... 9 location 2 8 INVERT button described 2 7 7 iocated 2 70 layout of 2 1 LEVEL switch described 2 19 located 2 78 MODE button Acquisition described 2 27 located 2 21 NORM button described 2 17 located 2 76 P P AUTO TV LINE button described 2 77 iocated 2 16 PLOT button located 2 2 5 menu 2 29 POSITION Horizontal knob described 2 15 located 2 14 SAVE REF buttons described 2 22 located 2 22 SAVE CON...

Страница 167: ...ined G 3 GRIB Interface option described A 1 GPIB Option A 21 Graticule defined G 3 described 2 5 illustrated 2 5 measuring time with 3 35 3 36 measuring voltage with 3 32 3 40 GRATICULE knob described 2 9 location 2 8 Ground defined G 3 H Hardcopy defined G 3 plotting or printing 3 46 Hertz defined G 3 Holdoff trigger defined G 3 Horizontal selecting mode 3 4 setting scale 3 4 Horizontal system d...

Страница 168: ...m checks A 37 4K to 1K display compress A 42 non store sweep length A 42 position range A 4 1 store differential and cursor time difference accuracy A 40 store expansion range A 41 timing accuracy and linearity A 38 X Bandwidth A 43 X gain A 42 Initial setup procedure A 28 Interval A 25 A 52 Limits and tolerances A 26 Miscellaneous external Z axis operation A 49 Miscellaneous Checks X Y plotter A ...

Страница 169: ...ting display intensity 3 6 setting horizontal scale 3 4 setting trigger position 3 18 setting up display 1 4 3 3 setting vertical scale 3 5 start up 1 3 subtracting two signals 3 20 triggering on signals complex 3 27 external 3 28 low frequency 3 26 non repetitive 3 27 repetitive 3 25 TV 3 28 viewing slow signals 3 10 Product description xi A 5 Protection optional impact A 2 Q Quantizing defined G...

Страница 170: ...ursor measurements of 3 35 3 36 graticule measurements of 3 35 3 36 Time base defined G 5 Trace defined G 6 Trace rotation 7 5 TRACE ROTATION adjustment described 2 9 location 2 8 Transmitting waveforms 3 44 3 45 3 48 Travel Line option described A 2 TRIG POS button described 2 21 located 2 27 Trigger defined G 6 hoidoff G 3 Level defined G 6 position defined G 6 selecting mode 3 4 Trigger level m...

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Tektronix 2221A, Руководство пользователя

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Содержание 2221A

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