Tektronix 2245A Operator'S Manual Download Page 142

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Performance Check Procedure

TRIGGER CPLG

Move test signal from CH 1 to the CH 2 input.

Set leveled sine-wave generator output to produce a 1.0 division dis
play amplitude at 150 MHz.

CHECK—that a stable display can be obtained. (The Trigger LEVEL

control may be adjusted to improve the display stability.)

Repeat the procedure for CH 3 and CH 4 (turn on the appropriate

VERTICAL MODE and move the test signal as required).

Move test signal to the CH 1 input.

Set VERTICAL MODE to CH 1 (others off).

m. Remove the 2X BNC attenuator from the test signal path.

Set leveled sine-wave generator output for a 2.2 division display ampli
tude at 100 MHz.

CHECK—that the display is stably triggered with NOISE REJ Trigger
CPLG but is not triggered with HF REJ Trigger CPLG.

Set leveled sine-wave generator output for a 0.5 division display ampli
tude at 100 MHz.

CHECK—that the display is not triggered in NOISE REJ Trigger CPLG.

Set:

TRIGGER CPLG

Horizontal MODE

A/B SELECT

B Trigger

Repeat 100 MHz NOISE REJ Trigger CPLG procedure for the B
Trigger.

Single Sweep Mode

Set:

Horizontal MODE

A SEC/DIV
A/B SELECT

10 (is

A Trigger

7-32

2245A Operators

Summary of Contents for 2245A

Page 1: ...in al T e ktro n ix M anual Q service T r I X OPERATORS 070 6558 01 I C r MANUAL Product Group 46 2245A PORTABLE OSCILLOSCOPE OPERATORS Please Check for CHANGE INFORMATION at the Rear of This Manual First Printing JAN 1989 Revised JUN 1989 Tfektronix COMMITTED TO EXCELLENCE ...

Page 2: ... T SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first number or letter designates the country of manufac ture The last five digits of the serial number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows B000000 Tektron...

Page 3: ...erman Postal Service has the right to re test the series and to verify that it complies TEKTRONIX Bescheinigung des Herstellers lmporteurs Hiermit wird bescheinigt da8 der die das___________________________ ________ 2245A OSCILLOSCOPE AND ALL INSTALLED OPTIONS__________ in Ubereinstimmung mit den Bestimmungen der Amtsblatt Verfugung 1046 1984 funkentstort ist Der Deutschen Bundespost wurde das Inv...

Page 4: ... Gerat eingesetzt wird mu 3 ebenfalls den Voraussetzungen nach Par 2 Ziff 1 der Vfg 1046 1984 genugen NOTICE to the user operator The German Postal Service requires that this equipment when used in a test setup may only be operated if the requirements of Postal Regulation Vfg 1046 1984 Par 2 Sect 1 7 1 are complied with HINWEIS fUr den Benutzer Betreiber Dies Gerat darf in Meflaufbauten nur betrie...

Page 5: ...1 3 PREPARATION FOR USE 1 4 Safety 1 4 Line Fuse 1 4 Line Voltage and Power Cord 1 4 Instrument Cooling 1 6 Start Up 1 6 Repackaging for Shipment 1 8 SECTION 2 CONTROLS CONNECTORS AND INDICATORS Crt Power and Display 2 1 Vertical 2 3 Horizontal 2 7 Trigger 2 11 A Trigger Modes 2 13 B Trigger Modes 2 14 Rear Panel 2 17 Measurements and Auto Setup Controls 2 18 2245A Operators i ...

Page 6: ...3 7 Measurement Compatibility and Error Messages 3 8 Measurements In Single Sequence Mode 3 8 Service Menu Features 3 9 Configure Menu 3 10 Self Cal Measurements 3 11 Internal Settings Menu 3 12 SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS Introduction 4 1 Initial Setup 4 1 Auto Setup Function 4 2 Trace Rotation Adjustment 4 3 Probe Low Frequency Compensation 4 3 Vertical Deflection Check 4 5 Timing ...

Page 7: ... 7 10 Input COUPLING Functional Check 7 10 CH 1 and CH 2 VOLTS DIV Trace Shift 7 11 CH 3 and CH 4 VOLTS DIV Trace Shift 7 12 CH 1 and CH 2 VAR VOLTS DIV TraceS hift 7 12 CH 1 and CH 2 Input COUPLING TraceS h ift 7 13 CH 2 INVERT Trace Shift 7 13 CH 1 and CH 2 VAR VOLTS DIV Range 7 13 Low Frequency Linearity 7 CH 1 and CH 2 Vertical Deflection Accuracy 7 15 CH 3 and CH 4 Vertical Deflection Accurac...

Page 8: ...ctional Check 7 35 HORIZONTAL 7 36 A and B Sweep Length 7 36 Horizontal POSITION Range 7 37 VAR SEC DIV Range 7 38 Magnifier Registration 7 38 A and B Timing Accuracy and Linearity 7 38 A and B Magnified Timing Accuracy and Linearity 7 41 Delay Time J itte r 7 42 Delay Time Accuracy 7 43 Delay Time Position Range 7 44 X Axis Gain Accuracy 7 44 X Y Phase Difference 7 45 X Axis Bandwidth 7 45 MEASUR...

Page 9: ...er Cords 8 1 OPTION 15 8 1 Standard Accessories 8 1 Optional Accessories 8 2 Instrument Enhancements 8 2 Transportation A ids 8 2 Cameras 8 2 Probes 8 3 Viewing Hoods 8 3 APPENDIX A AUTO SETUP MIN SETUP Control Settings APPENDIX B FACTORY SETTINGS CHANGE INFORMATION 2245A Operators v ...

Page 10: ...ns 3 2 3 2 Graticule measurement markings 3 3 3 3 Service Menu 3 9 3 4 Configure Menu 3 11 3 5 Internal Settings Menu 3 12 4 1 Probe compensation 4 5 5 1 Voltage difference measurement using cursors 5 2 5 2 Pulse period measurement 5 5 5 3 Frequency measurement 5 6 5 4 Rise time measurement 5 8 5 5 Phase difference measurement 5 10 5 6 Time difference between two delays 5 13 5 7 Eliminating common...

Page 11: ... 6 2 Environmental Characteristics 6 13 6 3 Mechanical Characteristics 6 15 7 1 Test Equipment Required 7 3 7 2 Slgnal to Graticule Accuracy 7 16 7 3 Settings for Timing Accuracy Checks 7 40 7 4 Delay Time Accuracy 7 43 A 1 AUTO SETUP Control Settings A 1 A 2 MIN SETUP Control Settings A 4 B 1 Factory Settings B 1 2245A Operators vii ...

Page 12: ...ersonal injury or loss of life Terms as Marked on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the markings or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking Symbols in this Manual This symbol Indicates where applicable cautionary or other information is to...

Page 13: ...by way of the grounding con ductor in the power cord is essential for safe operation Danger Arising From Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating can render an electric shock Use the Proper Power Cord Use only the power cord and connector specified for your product The power cord must ...

Page 14: ...Do Not Remove Covers or Panels To avoid personal injury do not remove the product covers or panels Do not operate the product without the covers and panels properly installed X 2245A Operators ...

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Page 17: ...g system controls most of the functions in the instrument Including a voltage and time cursor measurement system and a single button automatic front panel setup feature A menu driven service mode provides for con figuring of single sweep readout displays internal calibration and servicing diagnostics is r 1 SSHHffH A eae oi Figure 1 1 The 2245A Oscilloscope 1 1 2245A Operators ...

Page 18: ...e trigger system provides stable triggering over the full bandwidth of the vertical deflection system Alphanumeric crt readouts of the vertical and horizontal scale factors are displayed at the bottom of the screen On screen vertical and horizontal cursors provide accurate voltage time and frequency measurements measurement values are displayed at the top of the crt The measurement system provides...

Page 19: ...eference guide 1 Crt filter blue plastic installed 1 Fuse 2A 250 V slow blow 1 Accessory pouch Ziploc See Section 8 Options and Accessories for part numbers and further information about standard accessories and a list of the recommended optional accessories For more information on accessories and ordering assistance contact your Tektronix representative or local Tektronix Field Office 2245A Opera...

Page 20: ...r fuse and reinstall the fuse holder cap The 2245A operates on line voltages from 90 to 250 V with line frequencies ranging from 48 to 440 Hz No line voltage selecting is necessary Instru ments are shipped with the power cord that was requested on the order The power cord must match the power source outlet if It does not con tact your Tektronix representative or local Tektronix Field Office See Fi...

Page 21: ...BS 1363 IEC 83 A2 Australian 2 4 0 V 1 0A 240V AS C 112 A3 North American 2 4 0 V 15A 240V ANSI C 7 3 2 0 NEM A 6 15 P IEC 83 A4 Switzerland 2 2 0 V 6A 220V SEV A5 Abbreviations ANSI American National Standards Institute AS Standards Association of Australia BS British Standards Institution CEE International Commission on Rules for the Approval of Electrical Equipment IEC International Electrotech...

Page 22: ...age and timing measurement constants The power on self cal runs only if the stored constants have been lost possibly due to a dead memory back up battery The following warning message will be displayed for 5 sec onds WARNING PROBABLE BATTERY FAILURE TURN OFF AND ON TO VERIFY If the message reappears after having turned the power off and on have the battery checked and or replaced by a qualified se...

Page 23: ...ix Service Center enclose the following information owner s address name and phone number of a contact person type and serial number of the instrument reason for returning and a complete description of the service required 3 Completely wrap the instrument with polyethylene sheeting or equiva lent to protect the outside finish and keep harmful substances out of the instrument 4 Cushion instrument o...

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Page 27: ...sts the focus of the crt displays traces readout and cursors TRACE ROTATION Control Aligns the crt trace with the horizontal graticule lines This is a screwdriver adjustment jP READOUT Control Adjusts the brightness of the crt readout display includes all alphanumerics and cursors SCALE ILLUM Control Adjusts the illumination level of the graticule NOTE Life of the graticule illumination lamps can ...

Page 28: ...waveforms and readouts in an 80 mm vertical by 100 mm horizontal graticule area Internal graticule lines provide parallax free viewing of trace and graticule lines 0 10 90 and 100 points marked at the left edge of the graticule aid in making rise and fall time measurements 2 2 2245A Operators ...

Page 29: ...H 3 and CH 4 Select vertical channels for display At least one of the channels or ADD is always on and cannot be turned off until another channel Is turned on CHOP ALT In the CHOP mode the display chops between selected input channels at a rate of about 625 kHz In the ALT mode the se lected channels are displayed in sequence alternating at the end of each sweep ADD Displays the algebraic sum of th...

Page 30: ...factors for Channel 1 and Channel 2 from 2 mV per division to 5 V per division in a 1 2 5 sequence of 11 steps The switches are detented continuous rotation controls with no end stops The VOLTS DIV readouts reflect attenuation factors of coded attenuator probes connected to the vertical inputs 2 4 2245A Operators ...

Page 31: ...signal pickoff are also inverted A down arrow symbol is displayed be tween the Channel 1 and Channel 2 VOLTS DIV readout when the IN VERT mode is on COUPLING Buttons Select the method of coupling input signals to the Channel 1 and Channel 2 attenuators GND Disconnects the input signal and grounds the input of the asso ciated vertical attenuator to provide a zero ground reference volt age display T...

Page 32: ... of Channel 1 and Channel 2 vertical attenuators Input connectors are BNC type with an outer contact ring for recog nizing attenuation factors of coded attenuator probes A signal con nected to the CH 1 OR X input connector produces the horizontal de flection X Axis in the X Y horizontal mode Any of the vertical signal channels or ADD can provide vertical deflection Y Axis for an X Y display 19 PRO...

Page 33: ...annel 4 vertical attenuators Input coupling is dc only The input connectors are BNC with probe coding ring contacts the same as Channel 1 and Channel 2 The limited choice of deflection factors for the Channel 3 and Channel 4 inputs makes them useful for digital and trigger signals Horizontal Refer to Figure 2 4 for location of items 24 through 31 24 POSITION Control Adjusts the horizontal position...

Page 34: ...essing the Up Down Arrow buttons selects the horizontal deflec tion mode as shown by the MODE lights Not all Measurement modes are compatible with all horizontal deflection modes See Table 3 1 Behavior for Horizontal MODE Changes in Section 3 A Selects A sweep horizontal deflection The A sweep speed is de termined by the A SEC DIV switch setting as displayed in the crt 2 8 2 2 4 5 A O p e r a t o ...

Page 35: ...to B Trigger The start of the B sweep in RUNS AFTER mode or the arming of the B Trigger in any triggered mode is delayed from the start of the A sweep by a time determined by the setting of the OR DELAY con trol The B SEC DIV switch setting and the Delay Time Position set ting are displayed in the crt readout A greater than sign is dis played in front of the Delay Time readout if the B Trigger MOD...

Page 36: ...tends the slowest A sweep speed to at least 1 25 sec per division The UNCAL indicator is lit and a greater than sign Is displayed before each SEC DIV readout value when the sweep speeds are greater than the SEC DIV settings The SEC DIV settings are calibrated when the VAR control is in the fully clockwise detent position 2 CURSORS TIME POSITION Controls Set the reference and delta cursors on the d...

Page 37: ...ion in effect 3 TRACE SEP Control Positions the B sweep trace vertically with re spect to the A sweep trace when ALT Horizontal MODE is selected Trigger Refer to Figure 2 5 for location of items 32 through 38 32 A B SELECT Button Directs the MODE SOURCE CPLG SLOPE and LEVEL controls and Trigger lights TRIG D and READY to either the A or B Trigger system A when lit B when not lit Either A or B trig...

Page 38: ...east 10 times Adjusting this control can improve triggering stability of aperiodic signals i e complex digital waveforms 3 LEVEL Control Sets the amplitude level on the trigger signal at which either the A or B sweep is triggered Adjusting the LEVEL control to either end of its range in the AUTO LEVEL trigger mode resets the limits of the Trigger LEVEL control range to the peak to peak amplitude o...

Page 39: ... end stop or if AUTO LEVEL TRIGGER MODE is selected again AUTO LEVEL mode is useful for quickly locating and maintaining an appropriate triggering level NOTE When in AUTO LEVEL or AUTO triggering the A sweep free runs to produce a baseline trace when the A trigger source signal amplitude is too low or the frequency is below 10 Hz Switch to NORM triggering if the repetition rate is too slow for aut...

Page 40: ...as required by the setting of the VERTICAL MODE and HORI ZONTAL MODE switches Each displayed sweep in the sequence re quires a distinct A sweep triggering event The READY light remains on until the final trace in the sequence is completed The readout and cursors can be set to turn on briefly at the end of the sequence when using a camera factory setting default mode or they can be set to remain on...

Page 41: ...nc polarity to obtain correct triggering on the horizontal sync pulse 37 SOURCE Up Arrow and Down Arrow Buttons and Indi cators Select the trigger source for either the A or the B Trigger system as directed by the A B SELECT button Pressing the Up Down Arrow SOURCE buttons selects the trigger source for A or B trigger system as shown by SOURCE lights VERT Selects the trigger signal from the displa...

Page 42: ...played waveform frequency is time related to the ac power source frequency 3 8 CPLG Up Arrow and Down Arrow Buttons and Indica tors Select the method of coupling the input trigger signal to the A or B trigger system as directed by the A B SELECT button Pressing the Up Down Arrow buttons selects the trigger coupling as shown by the CPLG lights DC Couples dc and all frequency components of a trigger...

Page 43: ...e or power supply hum from the trigger signal AC Attenuates trigger signal frequency components below 50 Hz and blocks the dc component of the signal AC coupling Is useful for triggering on ac waveforms that have a large dc offset Rear Panel Refer to Figure 2 6 for location of items 39 through 41 39 EXT Z AXIS INPUT Connector Connects external signals to the Z Axis amplifier for intensity modulati...

Page 44: ... protective ground connection is connected to the exposed metal parts of the instrument The power cord must be connected to a properly grounded source for electrical shock protection Measurements and Auto Setup Controls Refer to Figure 2 7 for location of items 42 through 46 42 CLEAR MEAS MT Clears displayed service menus and cursor measurements functions 2 18 2245A Operators ...

Page 45: ...th CH 1 and CH 2 are selected the measurement channel is set to Channel 1 unless Channel 2 had been selected first 44 1 TIME Turns on the 1 TIME frequency measurement mode and displays two positionable vertical cursors in A MODE ALT and B MODE displays have two B sweeps and in ALT MODE the A sweep has two intensified zones The 1 TIME difference between the left and right cursors or edges of the B ...

Page 46: ...ly sets up the front panel con trols to produce a usable crt display of the input signals Setups are based on the characteristics of the applied signals The voltage and frequency characteristics of the input signal must be within the limits of the 2245A specifications Auto setup action for each front panel control is shown in Appendix A NOTE MIN SETUP as described below is only available on instru...

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Page 49: ...e marks for rise time and fall time measurements are marked on the left side of the graticule Vertical deflection factors and horizontal timing are cali brated to the graticule so that accurate measurements can be made directly from the crt The waveform displays are calibrated to the crt graticule markings for making quick and very accurate measurements of waveform parameters Voltage measurements ...

Page 50: ...L m n CHI VOLTS DIV t 1 1 11 C H 3 r VOLTS DIV TCH4 i VOLTS DIV J CHI COUPLING 1 CH2 VOLTS DIV 1 ca m r SCOPE BW 20 MHz CH2 COUPLING F A SEC DIV Q S I Z F b s e c d iv t OR X Y MODE SEC DIV UNCAL X10 MAG SEC DIV UNCAL INPUT COUPLING SYMBOLS A C DC GND r h 6558 10 Figure 3 1 Readout display locations 3 2 2245A Operators ...

Page 51: ...ounding The most reliable signal measurements are made when the 2245A and the unit under test are connected by a common reference ground lead in addition to the single lead or probe The ground lead of the probe provides the best grounding method for signal interconnection and ensures the maxi mum amount of signal lead shielding in the probe cable A separate ground lead with a banana plug can also ...

Page 52: ...justments For detailed operating considerations and probe maintenance see the in struction sheet supplied with the probe Coaxial Cables Signal input cables can greatly affect the accuracy of a displayed waveform To maintain original frequency characteristics of the input sig nal use only high quality low loss coaxial cables Coaxial cables must be terminated at both ends in their characteristic imp...

Page 53: ...tup button until the instrument returns to normal operation initiates the MIN SETUP function This automatically sets up the front panel controls but leaves many of the controls unchanged from what the user has set MIN SETUP action for each front panel control is whown in Appendix A MEASUREMENT SYSTEM The 2245A has a highly accurate voltage and time measurement system Voltage or time is measured be...

Page 54: ...DE In ALT Horizontal MODE the delay measure ment is made using either the intensified zones as the measurement points or the alternate B delayed sweeps For B Delayed Horizontal MODE the delayed sweeps only are available for making timing measurements When the Horizontal MODE is either ALT or B the B Trigger MODE must be set to RUNS AFTER if not the following message will be displayed USE RUNS AFTE...

Page 55: ...ween the cursor positions in A Horizontal MODE or between the delay time set ting and the delta delay time setting in either ALT or B Horizontal MODE Measurement points are the left ends of the two intensified zones in ALT Horizontal MODE Behavior for Horizontal Mode Changes If the Horizontal MODE Is changed to a mode that cannot be used for the active measurement that measurement will be canceled...

Page 56: ...igger system A question mark will appear in front of the delay time readout for delay measurements when the DELAY time is set to 0 25 division or less from the beginning of the sweep If a time measurement is selected when in ALT or B Horizontal MODE and the B Trigger MODE is NOT RUNS AFTER the displayed error message is USE RUNS AFTER DELAY TRIG MODE Measurements in Single Sequence Mode All cursor...

Page 57: ... MODE buttons that correspond to the menu prompts appearing at the right side of the crt dis play A menu selection underline appears under the SERVICE MENU heading Pressing the ADD button down arrow moves the underline down the CH 1 button up arrow moves the underline up Once the desired item is underlined select RUN CH 2 button to start the selected process Select Quit CH 4 button to exit the SER...

Page 58: ... MENU ON WHEN MEAS MT SELECTED Factory Settings de fault is NO Selecting NO clears the measurement menu items from the display after a measurement function is selected Measurement cursors remain displayed The AUTO TRACKING MENU remains on after a selec tion has been made Selecting YES allows a measurement menu to remain displayed after a function is selected The measurement menu items can be remov...

Page 59: ...r select QUIT to return to normal oscilloscope operating mode Self Cal M easu rem en ts This selection does a self characterization of the vertical channels 1 and 2 and the horizontal timing The SELF CAL MEASUREMENTS routine stores calibration constants that set the accuracy of the internal measurement system NOTE SELF CAL MEASUREMENTS can be performed anytime af ter a 20 minute warmup time to ens...

Page 60: ...the up arrow key to underline INTERNAL SETTINGS MENU and press the but ton again to display the SERVICE MENU To return to the oscilloscope mode select QUIT from the INTERNAL SETTINGS MENU or SERVICE MENU or press the CLEAR MEAS MT button INTERNAL SETTINGS MENU MAKE FACTORY SETTINGS T MENU ADJUST VERTICAL OUTPUT QUIT CH 1 ADD CH 4 6558 14 Figure 3 5 Internal Settings Menu MAKE FACTORY SETTINGS Sets...

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Page 63: ...es a voltage within the operating range of the instrument s power supply NOTE If you notice an improper indication or instrument mal function during these procedures refer the instrument to a qualified service person Initial Setup The following procedure may be used to set up front panel controls when the instrument Is first turned on or when a signal is not being applied to the input connectors 1...

Page 64: ... brightness Desired brightness Measurement Functions CLEAR MEAS MT Press to remove any displayed cursors Auto Setup Function The Auto Setup function can be used to automatically set up the front panel controls to produce a usable display of the applied signal 1 Connect signal s to be displayed to the appropriate input connector s For triggering to be set up properly when the AUTO SETUP button is p...

Page 65: ...race is parallel with the graticule line NOTE Normally the trace will be parallel to the center horizontal graticule line and the TRACE ROTATION adjustment will not be needed 2 If necessary adjust the TRACE ROTATION to make the baseline trace parallel to the center horizontal graticule line Use a small straight blade screwdriver or alignment tool Probe Low Frequency Compensation Misadjustment of p...

Page 66: ...ent tool supplied in the probe accessory package to adjust the low frequency compensation for a square front corner on the square wave displayed 7 Press the CH 2 VERTICAL MODE button to turn CH 2 on in the display and press the CH 1 Mode button to remove the CH 1 trace from the display 8 Set the CH 2 VOLTS DIV setting to 0 1 V 10 mV with probe discon nected and vertically center the PROBE ADJUST s...

Page 67: ...ay be used to check the Channel 1 and Channel 2 vertical deflection system in the following procedure 1 Connect the two 10X probes supplied to the CH 1 and CH 2 input con nectors 2 Connect both probe hook tips to the PROBE ADJUST connector 3 Set VERTICAL MODE CH 1 Horizontal MODE A 4 Press AUTO SETUP button 5 Set CH 1 and CH 2 VOLTS DIV switches to 0 1 V for the attached 10X probes 2245A Operators...

Page 68: ...e used to check the horizontal deflec tion system 1 Preset instrument controls and obtain a baseline trace and set the A SEC DIV switch to 0 1 ms Vertically center the baseline trace 2 Press the TIME button to select the Time Measurement function for measuring time difference 3 Align the reference cursor to the second vertical graticule line using the OR DELAY control both cursors are positioned t...

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Page 71: ...and signals con taining many unrelated frequency components may require more adjustment of the triggering controls to obtain the best display Voltage Measurement Cursors The CURSOR VOLTS function can accurately measure signals displayed on C H I or CH 2 Voltage measurements using the cursors may also be done on CH 3 CH 4 and ADD waveforms by setting the VOLTS DIV switch set ting of the selected me...

Page 72: ...he peak to peak voltage levels of CH 1 See Figure 5 1 NOTE Voltage cursors are initialized to levels seen by the peak detector circuitry Noise and other signals riding on the sig nal to be measured will cause a slight displacement of the cursors from the displayed waveform peaks and above 50 MHz the bandwidth rolloff of the trigger circuit will affect the initial cursor positions on the waveform 5...

Page 73: ... to the more positive point on the waveform Read the voltage difference Time Measurement Cursors Time measurement cursors may be used on any of the input waveforms only in the A Horizontal MODE Time measurements are also available in ALT and B Horizontal MODE see Time Delay Measurement in this section Tim e Difference Use the following procedure steps as a guideline in making time difference measu...

Page 74: ...The independent cursor cannot be positioned in front of the reference cursor f OR DELAY 7 Use the OR DELAY control to position the reference cursor to the leftmost point on the waveform to be measured Use the M control to position the independent cursor to the rightmost point to be measured Then read the time difference value In the top line of crt readout Period Measurem ent This is a time differ...

Page 75: ...rement mode is selected instead of TIME The measurement value is displayed in frequency units When the full period is defined by positioning the cursors the fre quency of the signal is displayed Use the same front panel setup used for time difference measurement as a guideline for making a frequency measurement with cursors see Figure 5 3 224SA Operators 5 5 ...

Page 76: ... Numbers 0 10 90 and 100 are etched near the left vertical graticule line These numbers provide convenient reference points for making rise and fall time measure ments when the signal to be measured is properly set up Use the following steps as a guideline In making rise time measurements 1 Apply the signal to the CH 1 input connector 2 Set Vertical MODE CH 1 Horizontal MODE A A Trigger SLOPE _ r ...

Page 77: ...OPE This places the trigger point at the beginning of the sweep so that when the SEC DIV setting is advanced the slope of interest remains within the viewing area 8 Increase the A INTEN control if necessary to brighten the beginning of the trace and use the Horizontal POSITION control to place the 50 level center of the rising edge of the waveform at the center vertical graticule line 9 Press TIME...

Page 78: ...r any channel may be used but CH 1 and CH 2 provide the most signal scaling possi bilities Use the standard 10X attenuator probe supplied with the instru ment to make the signal connections as they produce very little signal loading to a circuit under test and produce matched delays For phase measurements external loading of a circuit and different delays in the signal connection paths will produc...

Page 79: ...te reference setting 5 Select or SLOPE to position the waveform correctly within the graticule area for ease in measurement when viewing a single cycle of the reference signal 6 Press the TIME button to display time cursors 7 Position the first vertical cursor to the point where the reference waveform crosses the center horizontal graticule line in the positive di rection see Figure 5 5A The Horiz...

Page 80: ...il I A 1 H S 1EC H 3 3 6 O n e S Y m i i V 1 5 0 1 1 I B H i e c 3 1 n js 1 1 V 2 0 I 5 0 g 1 1 C 1 c K J iE C H 20is I 7 n s 9 1 V 2 0 r t 5 0 6 5 5 8 2 0 Figure 5 5 Phase difference measurement 5 10 2 2 4 5 4 Operators ...

Page 81: ...Phase Difference In degrees delta time reference time 360 _ 20 97 ns w or as in Figure 5 5 X 360 336 ns 22 5 NOTE For increased resolution of the phase measurement the sweep may be increased and both cursors repositioned to the measurement points see Figure 5 5C The X10 MAG feature may also be used in a similar manner by placing the measurement points at the center vertical graticule line be fore ...

Page 82: ...Horizontal MODE to ALT Advance the SEC DIV setting at least one position to obtain a faster B SEC DIV setting 5 Press the TIME button to turn on the time delay measurement mode which displays two intensified zones on the A Sweep trace and two alter nate B Delay Sweeps Use the TRACE SEP and Vertical POSITION con trols to position the sweeps vertically in the graticule area for ease of viewing the s...

Page 83: ...o B Sweep delays is displayed at the top of the screen Once the measurement points are identified the A Intensified Sweep traces may be removed from the display for ease in viewing the B Sweep traces by switching to B Delayed Horizontal MODE In B Horizontal MODE exact placement of the two delays may be obtained by positioning one trace over the other and then aligning the measurement point using t...

Page 84: ...1 and CH 2 to display the ADD trace by itself causes the message VOLTMETER SOURCE CH 1 OR 2 ONLY to appear and cancels the measurement If calling for a voltage measurement with ADD displayed and neither CH 1 nor CH 2 displayed the CH 1 Vertical MODE is turned on and the measurement is initialized to the signal applied to the CH 1 input Two common uses for ADD mode are 1 providing a dc offset to br...

Page 85: ...be canceled from the CH 1 signal d Select CH 1 and CH 2 Vertical MODE e Set Trigger SOURCE switch to VERT f Set both VOLTS DIV switches to produce displays of about two or three divisions in amplitude g Adjust the CH 2 VOLTS DIV switch and VAR control so that the CH 2 display is about the same amplitude as the component to be canceled in the CH 1 waveform see Figure 5 7A h Select both ADD and CH 2...

Page 86: ...MPONENT CH 2 SIGNAL FROM LINE FREQUENCY V N s s N V N iT fp r SOURCE INVERTED A CH 1 AND CH 2 SIGNALS SIGNAL WITH LINE FREQUENCY COMPONENT CANCELED _m m i 2 2 i 1 j B RESULTANT SIGNAL 6 5 5 8 2 2 Figure 5 7 Elim inating com m on m ode signals 5 16 2245A Operators ...

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Page 89: ... Performance Requirements column are verifiable quali tative or quantitative limits that define the measurement capabilities of the instrument Environmental Specifications of the 2245A are in Table 6 2 and Mechanical Specifications are in Table 6 3 Recommended Calibration Schedule To ensure accurate measurements check the performance of this instru ment every 2000 hours of operation once each year...

Page 90: ...by at least 2 5 1 Frequency Response 3 dB bandwidth 10 C to 35 C 5 mV to 5 V div Do to 100 MHz at the input BNC and at the probe tip 2 mV Do to 90 MHz at the input BNC and at the probe tip 35 C to 55 C Dc to 90 MHz at the input BNC and at the probe tip AC Coupled Lower 3 dB Point IX Probe 10 Hz or less 10X Probe 1 Hz or less Step Response 5 division step Rise Time 10 C to 35 C 5 mV to 5 V div 3 5 ...

Page 91: ...ight division input signal Trace Shift as VAR VOLTS DIV is Turned 1 division or less Invert Trace Shift 1 division or less Trace Shift Between VOLTS DIV Switch Positions 0 2 division or less Trace Shift Between GND and DC input Coupling 10 C to 35 C Less than 0 5 mV 35 C to 55 C Less than 2 mV a Position Range At least 11 divisions from graticule center Input Characteristics Resistance 1 M fl 1 a ...

Page 92: ...sponse 5 division step Rise Time 10 C to 35 C 3 5 ns or less 3 35 C to 55 C 3 9 ns or less 3 Delay Match CH 3 to CH 4 Less than 200 ps difference Trace Shift Between VOLTS DIV Settings 1 division or less Position Range At least i 11 divisions from graticule center Channel Isolation attenuation of deselected channel 34 dB or more at 100 MHz Channel isolation tested with eight division input signal ...

Page 93: ... 1 or CH 2 to CH 3 or CH 4 Less than 200 ps difference HORIZONTAL DEFLECTION SYSTEM Sweep Range A Sweep 0 5 s div to 20 ns div in a 1 2 5 sequence 3 X I0 magnifier extends maximum sweep speed to 2 ns div B Sweep 5 0 ms div to 20 ns div in a 1 2 5 sequence 3 X I0 magnifier extends maximum sweep speed to 2 ns div Accuracy 15 C to 35 C Unmagnified Magnified 2 3 10 C to 15 C and 35 C to 55 C 3 4 Sweep...

Page 94: ... divisions 3 X I0 Magnifier Expands the normal sweep by ten times around that portion of the sweep positioned at the center vertical graticule line 3 Registration X10 to XI 0 5 division or less shift Variable Control Range Continuously variable between calibrated SEC DIV settings Extends both the A and B sweep time per division by at least a factor of 2 5 Sweep Length Greater than 10 divisions Del...

Page 95: ...ion at 100 MHz 0 5 division or less will not trigger HF REJECT 0 35 division from do to 50 kHz attenuates signals above upper 3 dB cutoff frequency of 70 kHz LF REJECT 0 35 division from 100 kHz to 25 MHz increasing to 1 0 division at 150 MHz 100 MHz in AUTO LEVEL attenuates signals below the lower 3 dB cutoff frequency of 50 kHz AC 0 35 division from 50 Hz to 25 MHz increasing to 1 0 division at ...

Page 96: ...UT Accuracy 0 3 of reading 10 of one vertical division HOLDOFF Control Range Increases A Sweep holdoff time by at least a factor of 10 FUNCTIONS WITH DIGITAL READOUT Specifications for functions with digital readout are valid only when the ambient temperature is within 10 C of the temperature at the time of the last SELF CAL For maximum performance a recent SELF CAL is recommended CURSOR FUNCTIONS...

Page 97: ... C to 55 C Within 4 3 Horizontal X Axis 3dB Bandwidth 3 MHz or more Phase Match DC Coupled 3 degrees from do to 50 kHz EXTERNAL Z AXIS INPUT Active Region Lower Threshold intensity decreases above this voltage 1 8 volts or less Signal Required to Modulate an A or B Trace 3 8 volts or less provides noticeable modu lation of a normal intensity trace Usable frequency range is dc to 10 MHz External Z ...

Page 98: ...ery Life 5 years Battery Type 3 0 V 1200 mAH Type BR 2 3AE2P Lithium 3 WARNING To avoid personal injury have battery replaced only by a qualified service person who understands proper handling and disposal procedures tor Lithium batteries POWER SOURCE Line Voltage Range 90 Vac to 250 Vac a Line Frequency 48 Hz to 445 Hz a Line Fuse 2 A 250 V slow blow 3 Maximum Power Consumption 100 Watts 155 VA a...

Page 99: ...lity 0 1 division or less over eight vertical divisions No adjustment Nominal Accelerating Voltage 16 kV a OPTION 15 CH 2 Signal Out Dynamic Range 7 divisions Deflection Factor 10 mV div into 50 f l 10 20 mV div into 1 M Cl 10 3dB Bandwidth DC to 25 MHz DC Offset Adjusted 0 5 div measured at 2 mV DIV A GATE Out Output Voltage 3 5 V to 5 25 V positive going pulse starting at 0 V to 0 7 V Output Dri...

Page 100: ...Performance Characteristics Figure 6 1 Maximum input voltage vs frequency derating curve for the CH 1 CH 2 CH 3 CH 4 input connectors 6 12 2245A Operators ...

Page 101: ...ting test Equipment shall remain off upon return to room ambient during step 6 Excessive conden sation shall be removed before operating during step 7 Altitude Operating To 4 570 m 15 000 ft Maximum operating temperature decreases 1 C per 1000 ft above 5000 ft Non Operating To 15 240 m 50 000 ft Humidity Operating and Non operating Five cycles 120 hours referenced to MIL T 28800D paragraph 4 5 5 1...

Page 102: ... from 10 Hz to 55 Hz in 1 minute sweeps Hold from 10 minutes at 55 Hz in each of the three major axes All major resonances must be above 55 Hz Bench Handling Test cabinet on and cabinet off MIL STD 810D Method 516 3 Procedure VI MIL T 28800D Paragraph 4 5 5 4 3 Transportation Packaged Vibration Test Meets the limits of the National Safe Transit Association test procedure 1A B 1 excursion of 1 inch...

Page 103: ...l Dimensions See Figure 6 2 dimensional outline drawing Height With Feet and Accessories Pouch empty Approx 176 5 mm 6 95 in Without Accessories Pouch 163 6 mm 6 44 in Width with handle 360 4 mm 14 19 in Depth With Front Cover on 445 3 mm 17 53 in With Handle Extended 518 9 mm 20 43 in Cooling Forced air circulation no air filter Finish Tek Blue pebble grain finish painted on aluminum cabinet Cons...

Page 104: ...ee Figure 6 3 Dimensional drawing Height Overall 168 mm 6 6 in Center of mounting rail to bottom of cabinet 89 mm 3 5 in From cabinet top or bottom to respective front panel mounting holes 38 mm 1 5 in Between front panel mounting holes 102 mm 4 0 in Width Overall 483 mm 19 0 in Between mounting hole centers 464 mm 18 3 in Between outer edges of mounting rails 427 mm 16 8 in Between handle centers...

Page 105: ... mounting rail outside 472 mm 18 6 in Handles 44 mm 1 75 in Required Clearance dimensions Height 178 mm 7 in Width 448 mm 17 5 8 in Depth 508 mm 20 in Cooling Forced air circulation no air filter Finish Tek Blue pebble grain finish painted on aluminum cabinet Construction Aluminum alloy chassis front panel frame and rear support Plastic laminate front panel Glass laminate circuit boards 2245A Oper...

Page 106: ...Performance Characteristics Figure 6 2 Dimensional drawing standard cabinet 6 18 2245A Operators ...

Page 107: ...Performance Characteristics 6 5 5 8 25 Figure 6 3 Dimensional drawing rackmount cabinet 2240F1R 2245A Operators 6 19 ...

Page 108: ...This Document is a complete Scan from the original Tektronix manual For enquiries about our complete High quality line of technical Manuals in PDF mailto Qservice otenet gr SEE OTHER SIDE ...

Page 109: ...2245A Operators Qservice This Docum ent is a complete scan from the Original Tektronix Manual Qservice u 33 O O O I m m o o c 7s 33 m 33 m 33 N SECTION ...

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Page 111: ...ropriate test equipment instruction manual When you use equipment other than that recommended you may have to make some changes to the test setups If the exact example equipment in Table 7 1 is not available use the Minimum Specification column to deter mine if any other available test equipment might be adequate to do the check Performance Check Interval To ensure instrument accuracy check the pe...

Page 112: ...racteristics Section 6 let the instrument warm up for 20 minutes and run the SELF CAL MEASUREMENTS routine To run the SELF CAL MEASUREMENTS routine Press the CH 1 and CHOP ALT VERTICAL MODE buttons at the same time to display the SERVICE MENU Underline and select SELF CAL MEASURE MENTS by pressing the ADD button Press RUN CH 2 button to start the routine then QUIT CH 4 button to return to the norm...

Page 113: ...racy 0 25 High amplitude signal levels 1 V to 60 V Repetition rate 1 kHz Fast rise signal level 1 V Repe tition rate 1 MHz Rise time 1 ns or less Flatness 0 5 Signal source for gain and transient re sponse checks and adjustments TEKTRONIX PG 506 Calibration Generator 3 Time Mark Generator Marker outputs 5 ns to 0 5 s Marker accuracy 0 1 Trigger output 1 ms to 0 1 xs time coincident with markers Ho...

Page 114: ...ttenuator Ratio 2X Impedance 50 1 Connectors BNC Triggering checks Tektronix Part Number 011 0069 02 Adapter Connectors BNC male to miniature probe tip Signal inter connection Tektronix Part Number 013 0084 02 Alignment Tool Length 1 in shaft Bit size 3 32 in Low capacitance insulated Adjust TRACE ROTATION pot Adjust variable capacitors and resistors Tektronix Part Number 003 0675 00 Test Oscillos...

Page 115: ...ide Composite TV Video and Line Sync Signals Check TV Trigger circuit TEKTRONIX TSG 100 Test Signal Generator Digital Multimeter DMM Do Volts Range 0 to 140 V Dc Voltage accuracy 0 15 4 1 2 digit display Power supply voltage checks and adjustments TEKTRONIX DM501A Digital Multimeter 3 Requires a TM500 series power module 2245A Operators 7 5 ...

Page 116: ...POSITION Range all channels 7 18 13 CH 1to CH 2 Signal Delay Match 7 19 14 CH 1to CH 4 Signal Delay Match 7 20 15 CH 3 to CH 4 Signal Delay Match 7 20 16 CH 1and CH 2 Vertical Bandwidth 7 21 17 CH 3 and CH 4 Vertical Bandwidth 7 22 18 SCOPE BW Bandwidth Limit Accuracy 7 22 19 Common Mode Rejection R atio 7 23 20 Channel Isolation 7 24 21 AC Coupled Lower 3 dB P oint 7 25 22 Vertical ALT and CHOP M...

Page 117: ...itter 7 42 8 Delay Time Accuracy 7 43 9 Delay Time Position Range 7 44 10 X Axis Gain Accuracy 7 44 11 X Y Phase Difference 7 45 12 X Axis Bandwidth 7 45 MEASUREMENT CURSORS 1 K SEC H and l 1 SEC Cursor Accuracy 7 46 2 I VOLTS Cursor Accuracy 7 47 EXTERNAL Z AXIS PROBE ADJUST AND AUTO SETUP FUNC TIONS 1 Check External Z Axis Input 7 48 2 PROBE ADJUST Output 7 49 3 AUTO SETUP Functional Check 7 49 ...

Page 118: ...zontal MODE Horizontal POSITION A SEC DIV CLEAR MEAS MT FOCUS For a viewable readout For a viewable trace CH 1 0 1 V AC Off A Trigger AUTO LEVEL VERT DC _j positive going Min 12 o clock A 12 o clock 2 xs Press to remove measurement cursors For best defined display b Position trace vertically to the center graticule line c CHECK trace rotation control range is adequate to align trace with center gr...

Page 119: ...sify in order to see the time markers d CHECK deviation of any vertical line within the center eight horizontal divisions does not exceed 0 1 division half a minor division e Set CH 1 COUPLING to GND f Position trace slowly from the bottom graticule line to the top graticule line while making the following check g CHECK bowing or tilt of baseline trace doesn t exceed 0 1 division half a minor divi...

Page 120: ...1 and CH 2 VOLTS DIV 1 V CH 1 and CH 2 Input COUPLING DC SCOPE BW Off CH 2 INVERT Off A B SELECT A TRIGGER TRIGGER MODE AUTO LEVEL TRIGGER SOURCE VERT TRIGGER CPLG DC TRIGGER SLOPE T positive going TRIGGER LEVEL 12 o clock TRIGGER HOLDOFF Min Horizontal POSITION 12 o clock Horizontal MODE A SEC DIV 0 5 ms FOCUS For best defined display CLEAR MEAS MT Press to remove measurement cursors b Set Vertic...

Page 121: ...CH 2 k Disconnect the test signal from the 2245A 2 CH 1 and CH 2 VOLTS DIV Trace Shift a Set CH 1 and CH 2 VERTICAL MODE On CH 1 and CH 2 VOLTS DIV 2 mV CH 1 and CH 2 Input COUPLING GND b Set VERTICAL MODE to CH 1 CH 2 off c Position trace to center horizontal graticule line d Switch CH 1 VOLTS DIV through all positions from 2 mV to 5 V e CHECK trace shift does not exceed 0 2 division between step...

Page 122: ...and 0 5 V h CHECK trace shift does not exceed one division 4 CH 1 and CH 2 VAR VOLTS DIV Trace Shift a Set VERTICAL MODE CH 1 CH 4 off CH 1 VOLTS DIV 2 mV b Position trace to center graticule line c Set CH 1 VAR VOLTS DIV fully CCW counterclockwise d CHECK trace shift does not exceed one division e Set CH 1 VAR VOLTS DIV Detent calibrated VERTICAL MODE CH 2 CH 1 off CH 2 VOLTS DIV 2 mV f Position ...

Page 123: ... Set CH 1 Input COUPLING to DC g CHECK trace shift does not exceed 0 25 division 6 CH 2 INVERT Trace Shift a Set VERTICAL MODE CH 2 CH 1 off CH 2 Input COUPLING GND b Position trace to center horizontal graticule line c Set CH 2 INVERT On d CHECK trace shift does not exceed one division e Set CH 2 INVERT Off CH 2 Input COUPLING DC 7 CH 1 and CH 2 VAR VOLTS DIV Range a Set VERTICAL MODE to CH 1 CH ...

Page 124: ...CH 2 trace to the center horizontal graticule line h Move the test signal to the CH 2 input i Set CH 2 VAR VOLTS DIV fully CCW j Repeat the CHECK procedure for CH 2 k Set CH 2 VAR VOLTS DIV to detent calibrated position 8 Low Frequency Linearity a Set VERTICAL MODE CH 1 CH 2off CH 1 VOLTS DIV 10 mV SCOPE BW ON b Set calibration generator to Std Ampl output 20 mV c Move the test signal to the CH 1 ...

Page 125: ...n the trace two graticule lines below the center horizontal graticule line d CHECK all positions of the VOLTS DIV settings for correct signal to graticule accuracy using the settings in Table 7 2 Signal to Graticule Accuracy for the checks e Set calibration generator to Std Ampl output 10 mV f Move the test signal to the CH 1 input g Set VERTICAL MODE CH 1 CH 2 off CH 1 VOLTS DIV 2 mV h Same as c ...

Page 126: ... V 5 V 4 90 to 5 10 2 V 10 V 4 90 to 5 10 5 V 20 V 3 92 to 4 08 10 CH 3 and CH 4 Vertical Deflection Accuracy a Set VERTICAL MODE CH 3 CH 1off CH 3 VOLTS DIV 0 1V b Position the trace to the second graticule line down from the center horizontal graticule line c Move the test signal to the CH 3 input d Set calibration generator to Std Ampl output 0 5 V e CHECK the signal amplitude is between 4 90 a...

Page 127: ...ers off CH 1 and CH 2 VOLTS DIV 0 1 V CH 1 and CH 2 Input COUPLING DC b Connect calibration generator Std Ampl output to the CH 1 and CH 2 inputs via a 50 A precision BNC coaxial cable and a BNC dual input coupler c Set the calibration generator to Std Ampl output 0 2 V d Position the ADD signal to the center of the crt graticule with the CH 1 and CH 2 POSITION controls e CHECK That the ADD signal...

Page 128: ...t for two division signal at 50 kHz Set CH 1 VOLTS DIV 0 1 V CH 1 POSITION Fully CW clockwise CHECK that the bottom of the waveform is at least one division above the center horizontal graticule line Set CH 1 POSITION fully CCW CHECK that the top of the waveform is at least one division below the center horizontal graticule line Set CH 1 POSITION 12 o clock VERTICAL MODE CH 2 CH 1 off CH 2 POSITIO...

Page 129: ...H 3 POSITION fully CCW r CHECK that the top of the waveform is at least one division below the center graticule line s Set CH 3 POSITION VERTICAL MODE t Repeat the procedure for CH 4 u Set CH 4 POSITION to 12 o clock v Disconnect the test setup from the 2245A 12 o clock CH 4 CH 3 off 13 CH 1 to CH 2 Signal Delay Match a Set VERTICAL MODE CH 1 and CH 2 Input COUPLING CH 1 and CH 2 VOLTS DIV SEC DIV...

Page 130: ...ay Match steps This can be done by pressing the upper Trigger MODE button to cause the trigger level to be automatically readjusted g Set X I0 MAG On for 2 ns div sweep speed h CHECK that the leading edges of the two waveforms have less than 0 1 horizontal division separation at the center graticule line excluding trace width 14 CH 1 to CH 4 Signal Delay Match a Set VERTICAL MODE to CH 1 and CH 4 ...

Page 131: ...ne wave generator SG 503 output to the CH 1 in put via a 50 f l precision BNC coaxial cable and a 50 f l BNC termina tion c Set the leveled sine wave Generator output for a six division signal amplitude at 50 kHz d Set the generator Frequency Range and Frequency Variable controls for a 90 MHz output signal e CHECK the displayed signal amplitude Is 4 2 divisions or more as the frequency is Increase...

Page 132: ...ude is 4 2 divisions or more as the frequency is increased to 100 MHz f Repeat the procedure for 0 5 VOLTS DIV setting g Move the test signal to the CH 4 input h Set VERTICAL MODE to CH 4 i Repeat the procedure for CH 4 18 SCOPE BW Bandwidth Limit Accuracy a Set VERTICAL MODE CH 1 CH 4 off CH 1 VOLTS DIV 10 mV SCOPE BW On b Move test signal from the CH 4 input to the CH 1 input c Set leveled sine ...

Page 133: ...eveled sine wave generator output for an eight division signal display amplitude at 50 kHz c Set VERTICAL MODE CH 2 VOLTS DIV CH 2 INVERT SCOPE BW ADD CH 1 off 10 mV On Off d Adjust CH 1 or CH 2 VAR VOLTS DIV as needed for smallest signal amplitude e Set the leveled sine wave output frequency to 50 MHz f Set the VERTICAL MODE to CH 1 ADD off g Set the leveled sine wave output amplitude for an eigh...

Page 134: ...t CH 2 CH 3 and CH 4 VERTICAL MODE On CH 1 off e CHECK display amplitude is 0 1 division or less excluding trace width on the CH 2 CH 3 and CH 4 traces f Move sine wave generator signal to the CH 2 Input g Set CH 1 CH 3 and CH 4 VERTICAL MODE On CH 2 off TRIGGER SOURCE CH 2 h CHECK display amplitude is 0 1 division or less excluding trace width on the CH 1 CH 3 and CH 4 traces I Move sine wave gen...

Page 135: ...ERTICAL MODE TRIGGER SOURCE TRIGGER MODE 10 ms CH 1 all others off VERT NORM b Connect function generator FG 502 output to the CH 1 input via a 50 f l BNC coaxial cable and a 50 f l BNC termination c Set the function generator output controls to produce a six division sine wave display at 10 Hz with no dc offset d Set CH 1 Input COUPLING to AC e CHECK display amplitude is 4 2 divisions or more f S...

Page 136: ...e graticule area with the CH 4 trace near the bottom c Set SEC DIV to 10 ms d CHECK that four traces are sweeping across the screen alternately e Set CHOP VERTICAL MODE On f CHECK that four traces are sweeping across the screen simultane ously 23 BEAM FIND Functional Check a Push BEAM FIND in and hold b CHECK the signal is visible and compressed fully within the graticule area as the horizontal an...

Page 137: ...trace below the center horizontal graticule line to display the separated B trace o CHECK for at least four divisions of upward trace separation between the B trace and the A trace d Set TRACE SEP fully CCW e Position the CH 1 trace above the center horizontal graticule line to display the separated B trace f CHECK for at least four divisions downward trace separation of the B trace from the A tra...

Page 138: ... SCOPE BW On Horizontal MODE A A SEC DIV 1 ms Horizontal POSITION 12 o clock A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER SOURCE VERT TRIGGER CPLG AC TRIGGER SLOPE positive going TRIGGER HOLDOFF Min FOCUS For best defined display CLEAR MEAS MT Press to remove measurement cursors b Connect function generator FG 502 output to the CH 1 input via a 50 f l BNC coaxial cable and a 50 Cl BNC term...

Page 139: ... ms 0 000 minimum delay time For viewable display NOTE It may be necessary to adjust the TRIGGER LEVEL control to ob tain a display g CHECK that using the Trigger LEVEL control the display can be stably triggered in DC HF REJ and AC Trigger CPLG and that the display cannot be triggered in NOISE REJ or LF REJ Trigger CPLG h Disconnect the test setup from the CH 1 Input 2 500 kHz Trigger Sensitivity...

Page 140: ...r NOISE REJ CPLG by adjusting the Trigger LEVEL control 3 25 MHz Trigger Sensitivity a Set A A Trigger DC 50 ns Horizontal MODE A B SELECT TRIGGER CPLG A SEC DIV b Remove the 10X and 2X BNC attenuators from the signal path c Set leveled sine wave generator output to produce a 7 0 division dis play amplitude at 25 MHz d Add a 10X and a 2X BNC attenuator before the 50 f l BNC termination e CHECK tha...

Page 141: ...e display is stably triggered with NOISE REJ Trigger CPLG but does not trigger with HF REJ CPLG The Trigger LEVEL control may be adjusted to improve display stability in NOISE REJ CPLG 4 150 MHz Trigger Sensitivity a Set TRIGGER CPLG to DC b Set leveled sine wave generator to produce a 1 0 division display at 150 MHz c CHECK that the display is stably triggered in DC LF REJ and AC Trigger CPLG d S...

Page 142: ...MODE to CH 1 others off m Remove the 2X BNC attenuator from the test signal path n Set leveled sine wave generator output for a 2 2 division display ampli tude at 100 MHz o CHECK that the display is stably triggered with NOISE REJ Trigger CPLG but is not triggered with HF REJ Trigger CPLG p Set leveled sine wave generator output for a 0 5 division display ampli tude at 100 MHz q CHECK that the dis...

Page 143: ...on g Set A INTEN 3 4 fully CW CH 1 Input COUPLING DC see CHECK below h CHECK that the TRIG D LED flashes and the READY LED turns off after a single sweep and readout display occurs when the Input COU PLING switches to DC 6 Trigger LEVEL Control Range a Set TRIGGER MODE AUTO not AUTO LEVEL TRIGGER LEVEL Fully CCW A INTEN For a good viewing intensity b Remove 10X and 2X BNC attenuators from the test...

Page 144: ...BNC cable c Set CH 2 VAR VOLTS DIV control for a 0 5 division composite sync signal d CHECK that a stable display Is obtained e Set CH 2 INVERT TRIGGER SLOPE f CHECK that a stable display Is obtained On positive going CH 2 CH 1 off 1 V 0 2 ms negative going TV FIELD 8 TV Line Trigger Sensitivity a Set CH 2 INVERT TRIGGER SLOPE A SEC DIV Horizontlal MODE B SEC DIV A B SELECT TRIGGER MODE OFF negati...

Page 145: ...IV TRIGGER MODE TRIGGER SOURCE TRIGGER CPLG 0 1 V without a 10X probe attached DC 5 ms AUTO LEVEL LINE DC b Connect a 10X probe to the CH 2 input connector c Attach the probe tip to a length of wire at least four inches long Hold the wire near the middle portion of the instrument power cord d CHECK that the display can be triggered in both _J positive going and _ negative going slopes e Disconnect...

Page 146: ...OSITION A B SELECT TRIGGER MODE TRIGGER SOURCE TRIGGER CPLG TRIGGER SLOPE TRIGGER HOLDOFF TRIGGER LEVEL CLEAR MEAS MT FOCUS For a viewable readout For a viewable trace CH 1 DC 0 5 V A 2 ms 12 o clock A Trigger AUTO LEVEL VERT AC _ positive going Min 12 o clock Press to remove measurement cursors For best defined display b Connect time mark generator TG 501 to the CH 1 Input via a 50 D BNC coaxial ...

Page 147: ... B 1 ms B Trigger RUNS AFTER Fully CCW to the lowest DELAY readout value For a visible display Is 70 000 ms and the B Sweep 2 Horizontal POSITION Range a Set Horizontal MODE A Horizontal POSITION Fully CW b CHECK that the start of trace positions past the center vertical graticule line c Set Horizontal POSITION fully CCW d CHECK that the 11th time marker is positioned to the left of the cen ter ve...

Page 148: ...l to or less than two divisions d Set SEC DIV VAR fully CW calibrated detent 4 Magnifier Registration a Set X10 MAG on b Position rising edge of a time marker to the center vertical graticule line c Set X10 MAG off d CHECK for less than 0 5 division horizontal trace shift 5 A and B Timing Accuracy and Linearity a Set A SEC DIV to 20 ns b Set time mark generator for 20 ns time marks 7 38 2245A Oper...

Page 149: ...the second vertical graticule line e CHECK that the tenth time marker is within 0 16 divisions left or right of the tenth graticule line f CHECK that the spacing of the time markers over any two division Interval within the center eight divisions does not deviate from the value measured at the center two division by more than 0 1 division g Repeat the procedure for all other A SEC DIV settings Use...

Page 150: ...IS 0 1 is 1 is 0 1 is 2 is 0 2 is 2 is 0 2 is 5 is 0 5 is 5 is 0 5 is 1 0 18 1 IS 10 is 1 IS 20 is 2 is 20 is 2 is 50 is 5 is 50 is 5 is 0 1 ms 10 is 0 1 ms 10 is 0 2 ms 20 is 0 2 ms 20 is 0 5 ms 50 is 0 5 ms 50 is 1 ms 0 1 ms 1 ms 0 1 ms 2 ms 0 2 ms 2 ms 0 2 ms 5 ms 0 5 ms 5 ms 0 5 ms A Sweep only 10 ms 1 ms 10 ms 1 ms 20 ms 2 ms 20 ms 2 ms 50 ms 5 ms 50 ms 5 ms 0 1 s 10 ms 0 1 s 10 ms 0 2 s 20 m...

Page 151: ...h displayed time marker crosses the center horizontal graticule line at between 8 27 divisions and 8 73 division from the left most graticule line e CHECK that the spacing of the time markers over any 2 5 division interval within the center eight divisions does not deviate from the value measured at the center 2 5 divisions by more than 0 12 division Use the fifth vertical graticule line as a star...

Page 152: ...ODE ALT B SEC DIV 0 5 i s b Set time mark generator for 1 ms time marks c Position the Intensified dot to the leading edge of the 10th time marker to display the rising edge on the B Trace using the o r DELAY con trol It may be necessary to reduce the A intensity level to observe the intensified dot d Set Horizontal MODE B B INTEN Fully CW maximum intensity d CHECK that the jitter on the leading e...

Page 153: ...e second time marker and align the leading edge of the time marker displayed on the B Trace to the left most first graticule line using only the K OR DELAY control Using the Readout Accuracy Limits given in Table 7 4 check the delay time accuracy f Repeat the procedure for the 3rd through 10th time markers Table 7 4 Delay Time Accuracy Time M arker Readout Accuracy Limits 1st 0 000 ms 2nd 0 945 ms...

Page 154: ...sitioned at or after the 99th time marker located at a Delay Time of 9 9 m s f Disconnect the time mark generator from the 2245A 10 X A x is Gain A ccuracy a Set X Y CH 2 CH 1 off 10 mV DC GND Horizontal MODE VERTICAL MODE CH 1 and CH 2 VOLTS DIV CH 1 Input COUPLING CH 2 Input COUPLING b Connect calibration generator Std Ampl output to the CH 1 input via a 50 f l precision BNC coaxial cable c Set ...

Page 155: ...e at 50 kHz e Position dot to graticule center f Set CH 1 Input COUPLING to DC g CHECK ellipse opening at the center is 0 3 division or less measured horizontally 12 X Axis Bandwidth a Set VERTICAL MODE to CH 2 CH 1 off b Set leveled sine wave generator output for six divisions of horizontal display amplitude at 50 kHz c Set leveled sine wave output to 3 MHz d CHECK X Axis display is 4 2 horizonta...

Page 156: ...ELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER CPLG DC TRIGGER SOURCE VERT TRIGGER SLOPE positive going TRIGGER HOLDOFF Min FOCUS For best defined display b Connect time mark generator TG 501 output via a 50 f l BNC coaxial cable and a 50 f l BNC termination to the CH 1 input c Set time mark generator for 1 ms time marks d Position first time marker horizontally to the first vertical graticule li...

Page 157: ...ms b Connect calibration generator PG 506 output to the CH 1 input via a 50 D precision BNC coaxial cable c Set calibration generator to Std Ampl 0 5 V d Position bottom of the signal to the second horizontal graticule line from the bottom e Press the CURSOR VOLTS button to display the cursors VOLTS f Position the reference cursor to the bottom of the signal and the delta cursor to the top of the ...

Page 158: ... COUPLING DC Horizontal MODE A A SEC DIV 0 5 ms Horizontal POSITION 12 o clock A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER CPLG DC TRIGGER SOURCE VERT TRIGGER SLOPE positive going TRIGGER HOLDOFF Min FOCUS For best defined display b Connect calibration generator PG 506 Std Ampl output to the CH 1 and the EXT Z AXIS inputs via a 50 f l precision BNC coaxial cable a BNC T connector and two ...

Page 159: ...o the 2245A PROBE ADJUST output When using Tektronix coded probes the readout changes to 1 V c CHECK For a 5 division vertical display of PROBE ADJUST square wave signal square wave period is typically 1 ms within 25 3 AUTO SETUP Functional Check a Set CH 1 COUPLINQ GND CH 1 VOLTS DIV 2 mV A SEC DIV 20 ns b Press the AUTO SETUP button c Check that the Probe Adjust waveform is stably displayed on t...

Page 160: ...OURCE COUPLING On light on Off light off Off light off 2 MV GND 1 ms AUTO LVL VERT NOISE REJ b Push the CH 2 VERTICAL MODE button so that light is off c Connect the CH 2 signal from the rear panel CH 2 SIGNAL OUT con nector to the CH 1 OR X input connector via a 50 f l BNC cable d Align the CH 1 trace to the center graticule line e Set CH 1 Input Coupling to DC f CHECK Display amplitude to 4 5 to ...

Page 161: ...nerator output level to produce a 6 division CH 1 display q Increase the generator frequency to 25 MHz r CHECK Display amplitude is 4 24 divisions or greater s Disconnect the test setup 2 A GATE Output a Set SEC DIV 0 1 ms TRIGGER MODE Auto HOLDOFF Minimum CCW b Connect a test oscilloscope to the A GATE OUT Connector from the rear panel via 50 f l BNC cable c CHECK Test oscilloscope displays a sig...

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Page 163: ...2 2 4 5 A O p e r a t o r s Qservice This Docum ent is a complete scan from the Original Tektronix Manual Qservice o o o m u co h W 2 0 2 2 co m co 00 SECTION ...

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Page 165: ... 2 5 m Option A3 Australian 240 V 50 Hz 2 5 m Option A4 North American 220 V 50 Hz 2 5 m Option A5 Switzerland 220 V 50 Hz 2 5 m Option 15 The 2245A Option 15 oscilloscope provides two additional output signals from the rear of the instrument a Channel 2 output signal and an A GATE output signal The following paragraphs give a more detailed description of both of these outputs Specifications and P...

Page 166: ...02 Front Panel Cover and Accessory Pouch Option 1C C 5C Option 02 Camera Option IK K212 Portable Instrument Cart Option 17 P6408 Logic Probe included Option 22 Two P6109 Option 1 10X voltage probes Option 23 Two P6062B 1X 10X voltage probes 6 feet Standard Accessories The following standard accessories are provided with each instrument Part Number 2 Probes 10X 1 5 m with accessories 1 Power cord O...

Page 167: ...table instrument cart K212 Cameras Low cost scope camera Motorized camera High performance camera C5 Option 02 C7 Options 03 and 30 C30B Option 01 Probes Active probe Power supply for active probe Current probes Environmental probe High voltage probe 1X 10X passive probe Subminiature 10X probe Ground isolation monitor Isolator for floating measurements P6202A 1101A P6021 1 52 m P6022 1 52 m A6302 ...

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Page 169: ...2245A Operators Qservice This Docum ent is a complete scan from the Original Tektronix Manual Qservice O U m g x APPENDIX ...

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Page 171: ...ise B A MODE AUTO LEVEL B MODE RUNS AFTER if ALT or B selected otherwise as selected A SOURCE VERT B SOURCE VERT if ALT or B selected otherwise as selected A CPLG NOISE REJ if SOURCE Volts Div is set to 2 mV by AUTO SETUP otherwise DC B CPLG NOISE REJ if SOURCE Volts Div is set to 2 mV by AUTO SETUP otherwise DC A SLOPE As selected B SLOPE As selected A LEVEL Nominally midway between peaks of A SO...

Page 172: ...ound level aligned with 7th graticule line from top 3 The VERTICAL POSITION controls do not affect the position of the trace until moved through the point corresponding to the trace position set by AUTO SETUP CH 1 and CH 2 VOLTS DIV Channel turned on Lowest setting for which all waveform values are within 2 divisions of ground 3 CH 3 and CH 4 VOLTS DIV Channel turned on 0 5 V plus probe factor if ...

Page 173: ...d A intensify is set to 30 if Horizontal MODE is ALT The A INTEN B INTEN and READOUT controls do not affect display intensity until moved through the point corres ponding to the intensity level set by the AUTO SETUP TRACE SEP Midrange if ALT or B selected otherwise as selected The TRACE SEP control does not affect the trace separation until moved through the point corresponding to the trace positi...

Page 174: ...al MODE Is X Y CH 1 VOLTS DIV is stepped down one addi tional setting A SEC DIV One speed slower than the fastest speed that displays one complete cycle of the triggering signal within the range 2 ms to 20 ns Depending on Input signal characteristics if more than one complete cycle can be displayed at 20 ns the A sweep may be set to either 50 ns or 20 ns 5ms if TV FIELD selected 10 is If TV LINE s...

Page 175: ... DIV 1 XS A B SLOPE r A B SELECT A A TRIGGER MODE AUTO LEVEL B TRIGGER MODE RUNS AFTER A and B TRIGGER SOURCE CH 1 A and B TRIGGER COUPLING DC TRIGGER HOLDOFF As selected MEASUREMENTS OFF CONFIGURE Selections KEEP MENU ON WHEN MEAS MT SELECTED NO PRESET TV TRIG SLOPE FOR SYNC 3 YES A INTEN B INTEN READOUT As selected PRESET TV TRIG SLOPE only available on instruments Serial Numbered B020100 or abo...

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Page 177: ...as soon as they are developed and tested Sometimes due to printing and shipping requirements we can t get these changes immediately into printed manuals Hence your manual may contain new change information on the following pages A single change may affect several sections Since the change information sheets are carried in the manual until all changes are permanently entered some duplication may oc...

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Page 179: ...cessary to line up the key slots in the pouch plate with the keys on the rear panel the plate will be centered when aligned and push the plate all the way in see part B of illustration 4 Grasp the pouch plate assembly with both hands near the front of the assembly NOTE In the next step use only enough force to clear the frontpanel trim with the plate front edge Excessive force will cause aper mane...

Page 180: ...M A N U A L C H A N G E I N F O R M A T I O N Product 2245A OPERATORS______ Date 5 8 89 Change Reference C1 0589 DESCRIPTION C BOW THE PLATE AND SLIDE IT INTO THE FRONT TRIM GAP Page 2 of 2 ...

Page 181: ... 6 6 H O R I Z O N T A L D E F L E C T I O N S Y S T E M Replace the Sweep Linearity with the following Product 2245A OPERATORS_________________ Manual Part Number 070 6558 01 Sweep Linearity 0 5 s dlv to 5 ns dlv 5 2 ns div 15 Sweep Linearity applies over the center eight divisions Excludes the first 1 4 division or 25 ns from the start of the magnified sweep and anything beyond the 100th magnifi...

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Page 183: ... Product Group 46 EFFECTIVE ALL SERIAL NUMBERS P a g e 6 5 V E R T I C A L D E F L E C T I O N S Y S T E M Replace Delay Match with the following Delay Match CH 1 or CH 2 400 ps difference to CH 3 OR CH 4 Page 7 21 Step 14 CH 1 to CH 4 Signal Delay Match d CHECK that the leading edges of the two waveforms have 0 2 horizontal division separation at the center graticule line excluding trace width Pa...

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Page 185: ...ows 2 PROBE ADJUST Output a Set Test Oscilloscope VOLTS DIV 10 mV Test Oscilloscope SEC DIV 0 2 ms b Connect a 10X probe to thetestoscilloscope and connectthe probetip to the 2245A PROBE ADJUST output c CHECK Fora 0 5V 2 into 1MH of PROBEADJUSTsquarewave signal square wave period is typically 1 ms within 25 N O T E Rememberto take In to accountthe oscilloscope andprobe specifications when determin...

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Page 187: ...ce C5 0390 Product 2245A Operators Manual_________ Manual Part Number 070 6558 01 ___________________________ DESCRIPTION____________ Product Group EFFECTIVE ALL SERIAL NUMBERS Page 8 3 Optional Accessories Listed below is the recommended 1X 10X switchable probe Probes 1X 1OX Passive Probes P6062B 6ft Page 1 of 1 ...

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Page 189: ...C6 0590 Product 2245A OPERATORS______________ Manual Part Number 070 6558 01 DESCRIPTION Product Group 46 EFFECTIVE ALL SERIAL NUMBERS OPTION 15 Page 7 50 1 Signal Output Change Step f to read f CHECK Dlspayed trace is within 0 5 divisions of the ground reference set above neglect trace width Page 1 of 1 ...

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Page 191: ...4 with parts o through u shown below o CHECK that the display is stably triggered with NOISE REJ Trigger CPLG p Set leveled sine wave generator output for a 0 5 division display amplitude at 100 MHz q CHECK that the display is not triggered in NOISE REJ Trigger CPLG r Set leveled sine wave generator output for a 1 0 division display amplitude at 100 MHz s CHECK that the display is not triggered in...

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Page 193: ...e VOLTS DIV 10 mV Test Oscilloscope SEC DIV 0 2 ms b Connect a 10X probe to the test oscilloscope and connect the probe tip to the 2245A PROBE ADJUST output c CHECK For a 0 5 V 2 into 1 MO of PROBE ADJUST square wave signal square wave period is typically 1 ms within 25 NOTE Remember to takeinto accountthe oscilloscope andprobe speci fications when determining the accuracy of the PROBE ADJUST squa...

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