Tektronix 2252 Operator'S Manual Download Page 55

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SECTION 3

OPERATORS

FAMILIARIZATION

2252 Operators

Summary of Contents for 2252

Page 1: ... r V Z S OPERATORS 070 7837 00 I c r y MANUAL __________________Product Group 46 PORTABLE OSCILLOSCOPE OPERATORS Please Check for CHANGE INFORMATION at the Rear of this Manual First Printing JULY 1990 ...

Page 2: ...ice change privileges are reserved INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag orstamped on the chassis The first two digits designate the country of manufacture The last five digits of the serial number are unique to each instrument The country of manufacture is identified as follows B000000 Tektronix Inc Beaverton Oregon U S A E200000 Tektronix United King...

Page 3: ...German Postal Service has the right to re test the series and to verify that it complies TEKTRONIX Bescheinigung des Hersteliers l mporteurs Hiermit wtrd bescheinigt daB der die das______________ l__ 2252 OSCILLOSCOPE AND ALL INSTALLED OPTIONS in Ubereinstimmung mil den Bestimmungen der Amtsbiatt Verfugung 1048 1984 funkentstort ist Der Deutschen Bundespost wurde das inverkehrbringen dieses Gerate...

Page 4: ...s Gerat eingesetzt wird muB ebenfails 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 MeBaufbauten nur betrieb...

Page 5: ...RATION FOR USE 1 4 Safety 1 4 Line Fuse 1 4 Line Voltage and Power Cord 1 4 Instrument C ooling 1 8 Start Up 1 6 Repackaging for Shipment 1 7 SECTION 2 CONTROLS CONNECTORS AND INDICATORS CRT Power and Display 2 1 Vertical 2 3 Horizontal 2 8 Trigger 2 12 A Trigger Modes 2 15 B Trigger Modes 2 16 Rear Panel 2 20 Menu System Hardcopy and GPIB Controls and Indicators 2 21 2252 Operators i ...

Page 6: ...annel 2 Voltm eter Voltmeter Measurements Page 1 Voltmeter Measurements Page 2 GATED Measurements Cursor Volts Measurements Time Menus Counter Timer C T Measurement Menu Page 1 Gated C T Measurement Menu Page 2 C T Control Menu Conditions for Cursors Display Measurement C ursors Track Trig LvS C u rso rs Track fh C ursors Behavior for Horizontal Mode Changes Measurement Compatibility and Error Mes...

Page 7: ...uences 3 48 Waveform Digital Acquisition M odes 3 50 SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS Introduction 4 1 Initial S etup 4 1 Auto Setup Function 4 2 Trace Rotation Adjustment 4 3 Probe Low Frequency Compensation 4 3 Vertical Deflection Check 4 5 Timing C hecks 4 6 SECTION 5 BASIC APPLICATIONS Introduction 5 1 CH 1 CH 2 Voltmeter Measurements 5 1 Peak Voltage Measurement 5 2 Gated Voltage Mea...

Page 8: ...NCE CHARACTERISTICS Introduction 6 1 Recommended Calibration Schedule 6 1 SECTION 7 PERFORMANCE CHECK PROCEDURE Introduction 7 1 Test Equipment Required 7 1 Performance Check interval 7 1 Preparation 7 1 Index to Performance Check Procedure 7 6 DISPLAY 7 9 Trace R otation 7 9 G eom etry 7 10 VERTICAL 7 11 Input COUPLING Functional C heck 7 11 CH 1 and CH 2 VOLTS DIV Trace Shift 7 12 CH 3 and CH 4 ...

Page 9: ...tch 7 22 Ch 1 and CH 2 Vertical Bandwidth 7 22 CH 3 and CH 4 Vertical Bandwidth 7 23 SCOPE BW Bandwidth Limit A ccuracy 7 24 Common mode Rejection Ratio 7 24 Channel Isolation 7 25 AC Coupled Lower 3 dB P oint 7 26 Vertical ALT and CHOP M od es 7 27 BEAM FIND Functional Check 7 27 A and B Trace Separation 7 28 TRIGGERING 7 29 500 Hz Trigger Sensitivity 7 29 500 kHz Trigger Sensitivity 7 30 25 MHz ...

Page 10: ...se Difference 7 45 X Axis Bandwidth 7 46 MEASUREMENT CURSORS 7 47 SEC and 1 SEC MCursor Accuracy 7 47 t PHASE H Cursor Accuracy 7 48 4 VOLTS Cursor A ccura cy 7 48 fh VOLTS f Cursor Accuracy 7 49 Tracking Cursors Position Accuracy 7 49 CH 1 CH 2 VOLTMETER 7 51 DC Volts Accuracy 7 51 DC Volts Norma Mode Rejection Ratio 7 52 4 Peak Peak Peak to Peak Volts Accuracy 7 53 25 MHz Peak Peak and Peak to P...

Page 11: ... eck 7 61 Run MAKE FACTORY SETTINGS Routine 7 62 OPTION 1 5 7 63 Signal Output 7 63 A GATE Output 7 64 SECTION 8 OPTIONS AND ACCESSORIES Introduction 8 1 International Power Cords 8 1 Option 15 8 1 Option 1R Rackmounted Instrument 8 2 Other Available O p tio n s 8 2 Standard Accessories 8 3 Optional Accessories 8 3 APPENDIX A AUTO AND FACTORY SETTINGS AND SETUPS APPENDIX B GPIB OPERATION 2252 Oper...

Page 12: ... Store Recall Setup sequencing 3 39 4 1 Probe compensation 4 4 5 1 f PEAK voltage measurement and trackingcursors 5 4 5 2 Gated voltage measurement 5 6 5 3 Voltage difference measurement using cursors 5 7 5 4 Voltage measurement 5 9 5 5 Making a phase difference measurement 5 13 5 6 Time difference between the two de la ys 5 17 5 7 A and B Track Trig Lvl cu rso rs 5 18 5 8 Setting a specific trigg...

Page 13: ...racteristics 6 2 6 2 Environmental Characteristics 6 28 6 3 Mechanical Characteristics 6 30 7 1 Test Equipment Required 7 3 7 2 Signal to Graticule Accuracy 7 16 7 3 Settings for Timing Accuracy C h ecks 7 41 7 4 Delay Time Accuracy 7 44 A 1 AUTO SETUP Control Settings A 1 A 2 M N SETUP Control Settings A 5 A 3 Factory Settings A 6 r 2252 Operators ix ...

Page 14: ...per sonal injury or loss of fife 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 it self 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...

Page 15: ... by way of the grounding conductor in the power cord is essential for safe operation Danger Arising Prom 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 ren der an electric shock Use the Proper Power Cord Use only the power cord and connector specified for your product The power cord must...

Page 16: ...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 properiy installed xii 2252 Operators ...

Page 17: ...SECTION 1 INTRODUCTION 2252 Operators ...

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Page 19: ...to provide many automated counting and timing measurements with high ac curacy Other features include single button automatic front panel setup and a menu driven store recall setup function A menu driven service mode provides for configuring of certain menu and readout displays internal calibration and servicing diagnostics The instrument provides a hardcopy output ofthe displayed waveform The ins...

Page 20: ... include positive peak negative peak peak to peak and average dc levels measured over the entire display or a selected portion gated measurements Counter timer measurements include frequency period width totalize frequency ratio gated frequency gated period gated width gated events delta time one over delta time phase rise fal time and propagation delay using an interna or external frequency stand...

Page 21: ...face The instrument GPIB meets the standard IEEE 488 2 1987 The GPiBallows the front panel controls and menus to be operated under control of the programming of the controller All the front panel controls and menus are accessible via the communications port connector Digitized waveforms and measurement results can be gathered by the remote controller for long term data collection and or analysis u...

Page 22: ...elease it with a siIght counterclockwise rotation 2 Puli the cap with the attached fuse inside out of the fuse holder 3 Verify proper fuse value 4 Install the proper fuse and reinstall the fuse holder cap The 2252 operates on line voltages from 90 to 250 V with line frequencies ranging from 48 to 440 Hz No linevoltage selecting is necessary Instruments are shipped with the power cord that was requ...

Page 23: ... 220V 220V SEV IEC 127 aA 6A type C fuse is aiso installed inside the plug of the Option A2 power cord bReference Standards 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 i C International Electrotechnical Commission NEMA National Electrica...

Page 24: ...he instrument still does not turn on properly refer the instrument to a qualified service person TRIGGER MODE LEDs may be flashing to indicate the circuit location of a start up error you should report this information to the service person When the instrument is turned on a seif ca routine may run to set the voltage and timing measurement constants The power on seif cal runs only if the stored co...

Page 25: ...dimensions 2 If instrument is being shipped to a Tektronix 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...

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Page 27: ...SECTION 2 CONTROLS CONNECTORS AND INDICATORS 2252 Operators ...

Page 28: ... f ...

Page 29: ...sts the focus of the crtdisplays traces readout and cursors IT TRACE ROTATION Control Aligns the crt trace with the horizontal graticule lines This is a screwdriver adjustment READOUT Control Adjusts the brightness of the crt readout display includes all alphanumerics and cursors 7 SCALE ILLUM Control Adjusts the illumination level of the graticule NOTE Life of the graticule illumination lamps can...

Page 30: ...s in an 80 mm vertical by 100 mm horizontal graticule area Interna 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 fail time measurements 2 2 2252 Operators ...

Page 31: ...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 first 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 selected channels are displayed in sequence alternating at the end of each sweep ADD Displays the algebraic sum of the C...

Page 32: ...ctors for Channel 1and Channel 2 from 2 mV per division to 5 V per division in a 1 2 5 sequence of 11 steps The switches are detected 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 2252 Operators ...

Page 33: ...CH 1 or CH 2 VOLTS DIV set tings are uncalibrated variable function in effect Ts SCOPE BW Button Reduces the bandwidth of the vertical deflection system and trigger system to 20 MHz when the button is lit The full bandwidth is available when the SCOPE BW button is not lit m 3 CH 2 INVERT Button Inverts the Channel 2 input signal when the INVERT button is lit The Channel 2 input signal in ADD mode ...

Page 34: ...LING is displayed DC Couples dc and ail frequency components of the input signal to the vertical attenuator when the DC button is lit Turning on DC coupling turns off AC coupling With DC Coupling selected a DC symbol nrs is displayed to the right of the associated VOLTS DIV readout Input resistance is 1 M fl to ground Refer to Figure 2 3 for location of items 18 through 23 CH 1 OR X and CH 2 Input...

Page 35: ...l 3 and Channel 4 0 5 volt division button lit or 0 1 voit division button not lit The VOLTS DIV switch setting displayed in the crt readout reflects the attenuation factor of coded attenuator probes that are connected to the vertical inputs I 23 CH 3 and CH 4 input Connectors Connect signals to the inputs of the Channel 3 and Channel 4 vertical attenuators Input coupling is dc oniy The input conn...

Page 36: ...hts Not all Menu Measurement modes are com patible with all horizontal deflection modes See Table 3 1 Behaviorfor Horizontal MODE Changes in Section 3 A Selects A sweep horizontal deflection The A sweep speed is determined by the A SEC DIV switch setting as displayed in the crt readout Whenever A MODE is selected the A B SELECT switch is set to A Trigger ALT Alternates between A sweep with an inte...

Page 37: ...isplayed in the crt readout Whenever B MODE is selected the A B SELECT switch is set 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 K OR DELAY TIME control The B SEC DIV switch setting and the Delay Time Position setting are 2252 Operators 2 9 ...

Page 38: ...the A Horizontal MODE and the B SEC DIV switch is set only from the ALT or B Horizontal MODE NOTE The B sweep speed can never be slower than the A sweep speed When the two sweep speeds are the samet they are locked At this point A will follow B to slower SEC DIV set tings in ALT or B and B wilf follow A to faster settings in A A SEC DIV The calibrated A sweep speed is selected only in A HorP zonta...

Page 39: ...OR DELAY TIME This control has the following functions 1 Positions the reference and delta cursors together in a cursor measurement mode Volts measurement in At ALT B or X Y Horizontal MODES TIME measurement in A or B Horizontal MODES 2 Positions the reference and deita delays together in the TIME measurement modes in the ALT or B Horizontal MODE 3 Sets the B sweep delay time in the ALT or B Horiz...

Page 40: ...hen 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 Btrigger can be selected for any Horizontal MODE however A B SELECT is preset to A when A Horizontal MODE is select...

Page 41: ...START SLOPE B source 2 TRiG SELECT B STOP SLOPE f 3 3 SLOPE B utton Selects the slope positive or negative going of the trigger source signal that triggers either the A sweep the Bsweep orthe CyT Button lit positive going button not iit negative going 3 4 HOLDOFF C o n tro l Varies holdoff time sweep and the start of the next A sweep between the end of one A The HOLDOFF control can increase the mi...

Page 42: ... of the trigger signal adjusting to the clockwise stop will cause a reacquisition to the 90 level In either case the limits of the Trigger LEVEL control will be the 10 and 90 levels of the trigger signal 36 MODE Buttons Up and Down Arrows and Indicators Select the operating modes of the A and B trigger systems Pressing the U p Down Arrow buttons selects the operating modes as shown by the Trig ger...

Page 43: ...DE was TV LINE then setting B Trigger MODE to any other mode will cause B SLOPEto beset back to its previously selected non preset value After the A SLOPE has been preset it may then be altered as usual and B SLOPE will automatically be set to match it if B Trigger MODE is TV LINE If TV Sync Trigger Slope has not been preset in the Configuration menu the A SLOPE will stay at its prior setting A Tr...

Page 44: ...peration Each additional press of the down arrow MODE button when in single sequence mode resets the sweep and makes it ready to accept a trigger As in NORM trigger MODE the set triggering level changes only when the TRIGGER LEVEL control is adjusted to a new level setting When triggered the sweep runs to produce a single sweep of each trace as required by the setting of the Vertical MODE and Hori...

Page 45: ...ered when an adequate trigger signal is received after the delay time condition has been met When there is no trigger signal there is no B sweep trace TV LtMEFROMA SOURCE Starts the B sweep at the beginning ofthe video signal line received after the delay time has been met NOTE SLOPE polarity defaults to the A Trigger SLOPE This must match the composite sync polarity same asA TriggerSLOPE to obtai...

Page 46: ...CH 3 The signal applied to the CH 3 input connector Is the source of the trigger signal CH 4 The signal applied to the CH 4 input connector is the source of the trigger signal LINE The triggering signal Isobtained from asample ofthe ac power source waveform This trigger source is useful when the displayed waveform frequency istime related to the ac power source frequency Table 2 1 VERT Trigger SOU...

Page 47: ...OISE REJ coupling is useful for improving stability when the trigger signal is accompanied by low level noise HF REJ High Frequency Reject Attenuates high frequency trig gering signal components above 50 kHz HF REJ coupling is useful for providing a stable display of low frequency components of complex waveforms and eliminates high frequency interference from the trigger signal LF REJ Low Frequenc...

Page 48: ...he crt display Signals applied to the EXT Z AXIS INPUT do not affect display waveshape Signals with fast rise times and fall times provide the most abrupt intensity change The active region threshold level is 1 8 V A Z Axis voltage above the threshold voltage of 3 8 V produces noticeable modulation The Z Axis signals must be time related to the displayed signal to obtain a fixed intensity modulate...

Page 49: ...ay s via a Centronics compatible 25 pin female connector to an attached EPSONtw FX Serie compatible printer 44 GPIB Connector Provides the ANSf IEEE Std 488 1 1987 com patible electrical and mechanical connection to the GPIB The control ler operates the front panel and sets measurement modes Digitized waveforms and measurement results can be transferred to a system controller or host computer Menu...

Page 50: ...d menu could occur See Service Menu Features in Section 3 for using the operational modes of the SERVICE MENU 46 CLEAR DISPLAY Clears displayed menus measurement functions and cursor funbtions in the following order 1 Menu display Service Measurement Store Recal Setup menus and Hardcopy messages 2 Measurement function including TRACK MEASMT cursors if displayed 3 TRACK TRIG LVL and TRACK ih Figure...

Page 51: ...ls the last active measurement mode to the display and resets the measurement channel Ifthe last active measure ment mode is already displayed when the LAST MEAS MT button is pressed only the measurement channel is reset The measurement channel for VOLTMETER CURSOR VOLTS and RISE or FALL measurement modes is set to CH 1 if CH 1 is displayed otherwise to CH 2 If neither CH 1 nor CH 2 is displayed C...

Page 52: ...enu lets you select positionable cursors page 2 is for selecting the auto tracking SmartCursors TIME Calls up the menu to select the type of timing measurement to be made Menu choices are listed on the right side of the screen COUNTER TIMER Calls up the menu to select the type of counter timer measurement to be made Menu choices are listed on the right side of the screen 50 STORE RECALL SETUP Butt...

Page 53: ...ls unchanged from what the user has previously set Minimum setup action for each front panel control is shown In Appendix A 52y HARDCOPY Button Starts digitizing the A sweep display s and out puts the results via the HARDCOPY OUTPUT connector rear panel to an attached EPSON m FX Series compatible printer The A sweep dis plays are digitized between the A SEC DIV switch settings from 20 ns div to 0 ...

Page 54: ...Indicates the status of the GRIB LOCK Indicates that the GPIB has locked out the front panel controls of the instrument This condition can be cleared oniy over the bus or by cycling the instrument POWER switch The lockout condition is used when the controller wishes the present state of the instrument front panel to be protected when communicating with the instrument SRQ Indicates the instrument i...

Page 55: ...SECTION 3 OPERATORS FAMILIARIZATION 2252 Operators ...

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Page 57: ...icule lines Percentage marks for rise time and fall time measurements are marked on the left side of the graticule Vertical deflection factors and horizontal timing are calibrated 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 V...

Page 58: ...Operators Familiarization 1ST OR LEFT VERTICAL GRATICULE LINE 11TH OR RIGHT VERTICAL GRATICULE LINE GRATICULE LINE 6556 11 Figure 3 1 Graticule measurement markings 3 2 2252 Operators ...

Page 59: ...ysical markings are on the rotating switches and controi knobs to indicate the control setting A key to the location and type of readout information displayed is illustrated in Figure 3 2 MEASUREMENT NAME OR ERROR MESSAGE INPUT COUPLING SYMBOLS AC DC GND f h 6373 10 Figure 3 2 Readout display locations 2252 Operators 3 3 ...

Page 60: ...ry with closely spaced leads SCALE FACTOR SWITCHING The VOLTS DIV scale factors displayed on the crt reflect the probe attenuation factor when Tektronix coded probes are used OPERATING CONSIDERATIONS To get the best waveform fidelity keep probe ground and signal leads as short as possible Misadjusted probe compensation can cause measurement error Check and adjust probe compensation whenevera probe...

Page 61: ...play The voltage and frequency characteristics of the input signal must be within the limits of the 2252 specifications given in Section 6 Auto setup action for each front pane control is shown in Appendix A Minimum Setup Pressing and holding the AUTO SETUP button until the instrument returns to normal operation initiates the minimum setup function This automatically sets up the front pane control...

Page 62: ...menu item on the display seiects that function i e to another menu page a measurement selection a measurement source channel service feature store recail setup features or menu off When a measurement mode measurement source channel or service feature in the menu list is selected that label is underlined introduction M ENU MEASUREMENTS C U A R AS M l EAST VU1 T DISPLAY CHANNEL M EASM TM ETER VOLTS ...

Page 63: ...nu and return the display to a normal operating mode Measurement functions are turned off with the second press or the first press if no menu is displayed Finally the TRACK TRIG LVL and TRACK cursors are canceled with a third press orthe first press if no menu is displayed and no measurement function is active Setting Measurement Channel Press SET MEAS MT CHANNEL button to call up one of the menus...

Page 64: ...is turned on if not previously selected and it remains displayed when deselected as the measurement source channel Any vertical channel traces turned on that are not wanted in the display must be turned off using the Vertical MODE buttons The following illustrations show all the possible menus that may be called up when the SET MEAS MT CHANNEL button is pressed depending on the measurement mode in...

Page 65: ...ve measure ment and then recalls it in its initialized state This feature is useful for return ing VOLTS cursors and under some conditions TIME cursors or delays to their initialized positions after they have been adjusted away The measurement channel for VOLTMETER CURSOR VOLTS and RISE or FALL measurement modes is set to CH 1 if CH 1 is displayed otherwise to CH 2 If neither CH 1 nor CH 2 is disp...

Page 66: ...efault channel If both CH 1 and CH 2 are being displayed the default measurement source channel upon each initialization is also CH 1 Use the SET MEAS MT CHANNEL function to assign CH 2 as the measurement channel Turn off the CH 1display if CH 2 is the desired default measurement source channel If both CH 1and CH 2 are turned off while the Voltmeter measurement is active the error message VOLTMETE...

Page 67: ...ill control the B delayed sweep position and the DELAY measurement runs displaying the delay time value in the top line of the readout If horizontal mode is changed to A when the above menu is displayed the menu will disappear but the selected Volts measurement will continue run ning with the measurement tracking cursors tracking the A sweep as in the normal nongated version of the Volts measureme...

Page 68: ...splayed If there Is no trigger signal in AUTO LEVEL or AUTO Trigger MODE the readout value will be unstable and meaningless Gated Voltmeter measurements are made within the gated intensified region on the displayed waveform The position of the gated zone is set using theN OR DELAY TIME control and the width is set using the H control Gated measurements are not allowed In SGL SEG Trigger MODE activ...

Page 69: ...tion Menu 2 If DELAY is selected the DELAY measurement runs displaying the delay time value in the top line of the readout the k OR DELAY TIME knob will control B delayed sweep position and the H knob has no effect Ifk H is reselected the previously selected Cursor Volts measurement is restarted If the Horizontal MODE is changed to A when the above menu is displayed the menu will disappear but the...

Page 70: ...els MENUfirst MEASUREMENT second and TRACKTRIGLVLand TRACK rh cursor last The highest level being displayed is turned off each time the CLEAR DISPLAY button is pressed TRACK MEASMT Press to enable or disable the Channel 1 or Channel 2 Voltmeter measurement tracking cursors SmartCursors that show the waveform measurement points The state of the TRACK MEASMT feature does not affect the positionable ...

Page 71: ...ement mode is underscored when the menu is displayed Only one active measurement at a time is allowed Making a selection removes the menu unless SERVICE mode CONFIGURE menu is set to keep menu on when measurement selected The selected measurementtype and value are displayed at the top of the screen In A Horizontal MODE cursors are always used to make k SEC H k 1 SEC H and le PHASE Mmeasurements If...

Page 72: ...rence between the two vertical cursors displayed in the A Horizontal MODE or the two time delays in ALT or B Horizontal mode The position of both cursors or both delays is controlled by thek OR DELAYTIME control the position of the delta cursor or the delta delay is controlled by the 4 control The measured time difference between the two cursors or delays is dis played in the crt readout When Hori...

Page 73: ... used in B Horizontal MODE When the C T is used at B Trigger modes are available as in k SEC H and k 1 SEC 4 the selected mode isthe same for both B delay and Bdelta triggers To set a new reference manually press k SET 360 and position the cursors to the new reference value using the k OR DELAY TIME and H control knobs After setting the new reference press k phase to continue the phase measurement...

Page 74: ...displayed in B horizontal mode The k OR DELAYTIME con trol knob positions both delay times reference and delta together and the Hcontrol knob positions the independent delta delay If horizontal mode is changed from B back to ALT when Cursor Knob Allocation menu 2 is displayed this menu will disappear and the measurement will continue using the C T to make the measurement The following error messag...

Page 75: ... TRIG 20 80 will cause the measurement to use the 20 and 80 points The SET REF H item toggles on underlined or off each time its but ton is pushed When on the k 0 and 100 cursors will appear for manual adjustment of the rise fall reference levels When toggled back off again the rise fall measurement will resume using these new levels to calculate and set the 10 90 or 2G 80 trigger levels RISE meas...

Page 76: ...SE REJ not allowed because this would cause incorrect measurement triggering INCREASE SIGNAL AMPLITUDE Source signal s pk pk amplitude is too low for accurate rise fali measurement should be at least 4 divisions MEASSOURCE INPUT IS GROUNDED This message is shown if the source coupling is set to GND MEAS SOURCE VAR OUT OF DETENT Trigger levels cannot be computed correctly unless attenuator is calib...

Page 77: ...ens try changing A Trigger SLOPE and or A Trigger LEVEL TRIG 10 90 is the default when RISE or FALL Is first called up When selected the C T will set the trigger levels at the 10 and 90 points between the 0 and 100 reference levels TRIG 20 80 may be selected after a RISE or FALL measurement has been started up When selected the trigger levels arerecomputed forthe 20 and 80 points between the 0 and...

Page 78: ...gger SLOPE and CPLG are settable B Trigger LEVEL may be set manually after the measurement starts The triggering range is the same as in B NORM Trigger MODE The following error messages are possible Message NO A SWEEP NO START NO STOP 100s Reason No A sweep was detected after timeout No start trigger was detected No stop trigger was detected Time interval greater than 100 seconds timeout disabled ...

Page 79: ...The selected resolution magnifier gets underlined See the C T Control Menu discussion for a description of resolution magnifier operation T IM E R C O N TR O L AUTO RESOL X1G RESOL X I 00 RESOL C T TR IG TIMEOUT BACK TO TIM E MENU Timer Control menu Each press of the C T TRIG TIMEOUT item button toggles this function on and off Timeout mode gets underlined when it istoggled on Toggling timeout mod...

Page 80: ...ntrol which edge polarity triggers the C T The B trigger light remains off during C T measurements However indication of proper triggering is shown with a steadily blinking Ct character in the top line of the readout If an external frequency reference source is plugged into the rear panel EXT C T REFERENCE INPUT BNC the a char acter will have the ET character above it In TOTALIZE the Ct character ...

Page 81: ...y No stop trig was detected after timeout while trying to measure chx frequency NO CHy TRIG No start trig was detected after timeout white trying to measure chy frequency No stop trig was detected after timeout while trying to measure chy frequency CHx 0 01 Hz Frequency of chx signal less than 0 01 Hertz timeout disabled CHy 0 01 Hz Frequency of chy signal less than 0 01 Hertz timeout disabled 999...

Page 82: ...n gated measurements 999999999 Gated event count greater than 999999999 TO C T CONTROL MENU Causes C T CONTROL menu to appear CTR TIM EH PG 2 OATEO FREQ C T CONTROL IN TE N SIFY GATE GATED PERiOD IN TE N SIFY CTR GATED W ID TH AUTO RESOL GATED EVENTS X I 0 RESO L BACK TO PR EVIO US M ENU X I 00 RESOL TO C T C O NTRO L M ENU C T TRIG TIM E O U T Gated C T Menu C T Control Menu C T Control Menu Desc...

Page 83: ...ent time interval approxi mately 320 milliseconds or 1 period of the trigger signal whichever is larger for single channel measurements approximately 600 milli seconds for dual channel measurements The resolution of the measurement is then calculated and as many fully resolved digits as possible are displayed X I0 RESOL When selected the C T will make one trial measurement using the fixed measurem...

Page 84: ...nt the units of the LSD are larger than 10 picoseconds 10 X 10 12sec If it is not possible the message NOT POSSIBLE isdlsplayed to the left of the X100 RESOL menu label for approximately one second then the X100 RESOL label is deselected and the X10 RESOL label is selected underlined if the trial measurement results do not allow X10 RESOL mode either NOT POSSIBLE is displayed by the X I0 RESOL lab...

Page 85: ...nds Conditions for Cursors Display The following information is an aid in understanding the order in which the menu measurement cursors are displayed Measurement Cursors One ortwo measurement cursors may be displayed if any one of the following conditions is met VOLTMETER CH1 CH2 TRACK MEASMT is underlined and measurement source channel is on and the VOLTS DIV VAR control in detent CURSOR VOLTS Me...

Page 86: ...e than two cursors total may be displayed if the following conditions are met TRACK fh is underlined and CH 1 and or CH 2 Vertical MODE is selected Trigger source channel CH 1and or CH 2 VOLTS DIV VARcontrol Is in detent 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 without a message...

Page 87: ... and GATED PK PK A ALT B X Y FREQ PERIOD WIDTH TOTALIZE and FREQ RATIO A ALT B X Y GATED C T FREQ PERIOD WIDTH and EVENTS A ALT B X Y RiSE FALL and PROP DELAY A ALT B X Y Measurement Compatibility and Error Messages Channel 1 or Channel 2 Voltmeter measurements expept DC cannot be made when the signal is larger than the range of the B trigger level The dis played error message is OUCH TURN VOLTS D...

Page 88: ...en in ALT or B MODE PEAK PEAK and PK PK measurements The following measurements cannot occur when the VOLTS DIV VARcontrol for the channel being measured is not in the detent position t PEAK PEAK PK PK DC GATED PEAK GATED PEAK GATED PK PK VOLTS t and fh VOLTS H The displayed error message is MEAS SOURCE VAR OUT OF DETENT The following measurements cannot occur when the SEC DIV VAR control is out o...

Page 89: ...e result held in the readout display if readout is configured to remain on in SGL SEQ mode each time SGL SEQ Mode is reentered The readout and or cursors are displayed briefly during SGL SEQ Mode for making a photographic record or they may be configured to remain on see the discussion on Configure Menu in the Service Menu Features part of this section The displayed readout isthe value of the meas...

Page 90: ...de Configure Menu The operating mode features in the CONFIGURE menu seldom need to be changed CONFIGURE E N D ACQUIRE IN PEAK DE TEC T M ODE YES NO RU NNING KEEP M ENU ON W HEN MEAS SELECTED RECALL ONLY IN STOfiE RECALL KEEP M ENU ON W HEN S R SELECTED KEEP READOUT ON IN SOL SEQ IN IT IA U Z E TIM E CURSORS DELAYS PRESET TV TR IG SLOPE FOR S Y N C PRESET TV TR IG SLOPE FOR S Y N C Configure Menu a...

Page 91: ...utton is pressed From the Store Recail Setup menu you can store edit and recall front panel setups Selecting YES displays the Recall Only menu when the STORE RECALL SETUP button is pressed From the Recall Only menu you can easily step through all of the stored front panel setups KEEP MENU ON WHEN S R SELECTED Factory Settings default is NO Selecting NO clears the menu from the display when some st...

Page 92: ...elay is appropriate to the measurement mode it will be set inside a window that extends from 0 25 division after sweep start to one period of the trigger signal left of the 10th division after sweep start if this window exists if there is no window it will be left at its original position If the reference cursor is appropriate to the measurement mode it wilt be set as specified for the reference d...

Page 93: ...lected When the final question is answered the SERVICE MENU display returns Self Cal Measurements This selection consists of SELF CAL HARDCOPY procedure SELF CAL VOLT MEASUREMENTS routine and SELF CAL TIME MEASUREMENTS routine The SELF CAL HARDCOPY procedure characterizes channels 1 2 3 and 4 and horizontal position Before performing any SELF CAL discon nect ali input signals The SELF CAL VOLT MEA...

Page 94: ...N G S M E N U M AK E FACTORY S E T T IN G S t MENU LOAD STO R E R EC ALL SETUPS i A D JU S T V E RTICA L O U TP U T SET GPfB A D D R ESS Q UIT Internal Settings Menu LOAD STORE RECALL SETUPS Loads eight factory front panel setups into the Store RecaH memory The setups are stored in memory locations 01 through 08 and ail previously stored setups in locations 01 through 20 will be deleted When you s...

Page 95: ...T TOP blank Factory Setups 02 AUTO TO 100 MHZ blank 03 SELECTABLE TIME blank SEQ1 04 05 MANUAL D VOLTS blank SET CURSORS blank 06 ADJUST CHI V D blank User 07 08 SELECT DELAY blank Added MATCH EDGES END SEQ Setups 09 CHI FREQ blank SEQ 2 10 CH2 FREQ blank 11 XY CH2 VS CHI END SEQ SEQ 3 12 CHI FALL TIME blank CH2 RISE TIME END SEQ 14 DELETED 15 Empty 16 Setup 17 Memories 18 19 t 20 Nonstored locati...

Page 96: ...g extensive changes to existing setups The Store Recall Setup menu with access to Recall Only operates the same asthe Store Recall Setup menu except that the menu display is cleared when the STORE or RECALL item is selected The first choice in the menu when configured in this manner is SEQUENCE and when selected accesses the Recall Only menu for sequencing the setups This configuration is useful f...

Page 97: ...ton displays the recall pnly menu for sequencing through the front panel setups for a series of measurements As with ail menus the Recall Only menu can be removed from the display by pressing the CLEAR DISPLAY button To configure the oscilloscope to access the Recall Only menu 1 Press the top and bottom Menu Select buttons to display the SERVICE MENU 2 Call up the CONFIGURE menu see the Configure ...

Page 98: ...nfiguration is most useful when making changes to a sequence before a measurement series is started a Set KEEP M ENU ON WHEN MEAS SELECTED YESorNO RECALL ONLY IN STORE RECALL NO KEEP M ENU ON WHEN S R SELECTED NO b Press the CLEAR DISPLAY button to exit from the SERVICE MENU c Press the STORE RECALL SETUP button d Press the SEQUENCE button to display the Recall Only menu CH 1 PEAK 2 42 V Name of R...

Page 99: ...g SEQUENCE from the Store Recali the record number will start at the same number as displayed on the Store Recali Setup menu Dow n A rrow Button I R ecalls the front panel settings for the previous record in the current sequence If the displayed record is the first in a sequence pressing the down arrow button wilt recall the current record NEXT SEQ Changes the current record number to the first st...

Page 100: ... SETUP button to display the menu CHI PEAK Name of Record RECALL NEXT SETUP XX RECALL Status of Record STORE DELETE SELECT SETUP INSERT NEXT WITH CONTROL ALTER LABELS 5V 2V 1V 1Vw 1s STORE RECALL Setup menu display The descriptions of the readout locations and menu items are from top to bottom as follows Active Measurement Display Indicates the measurement that is currently active if one is The me...

Page 101: ...I or the first setup past a previous setup with an END SEQ status SEQUENCE Displayed in place of RECALL NEXT when NO is selected for both the KEEP MENU ON WHEN S R SELECTED and RECALL ONLY IN STORE RECALL in the CONFIGURE menu When SEQUENCE is pressed the RECALL ONLY MENU is displayed See Recall Only Menu in this section RECALL Recallsfront panel settings from the current setup number If the SETUP...

Page 102: ...STEP 20 will be displayed Selecting INSERTwiii delete the existing record 20 and replace it with a new one Selecting ABORTwill keep the existing record 20 and not save the new record if record 20 is displayed selecting INSERT will cause a message NO MORE STEPS to be displayed Active Front Panel Settings indicates the VOLTS DiV and SEC DiV settings for the currently active setup bottom line of read...

Page 103: ...d Status of R e c o rd indicates the status EMPTY END SEQ DELETED or blank of the currently displayed record EMPTY appears only when there are no stored front pane setups END SEQ is the end of sequence indication DELETED appears on the last record when it is a record saved from a STORE or DELETE function A record with the DELETED status cannot be modified Attempting to do so will display an error ...

Page 104: ... control to the setup num ber that is to be replaced and press the STORE button b To insert a new setup rotate the control to the setup number that is to precede the new setup and press the INSERT NEXT button 5 Press ALTER LABELS button 6 Alter the name and status of the new setup as desired See ALTER LABELS description in this section Storing Setups in S equences Front pane setups are stored In t...

Page 105: ...t the front panel controls in several ways setting the individual controls manually inputting the desired signals and pressing the AUTO SETUP button or by recalling and modifying an already stored setup 5 Rotate the H control to the setup location that is to precede or start the first setup in the sequence 6 Press INSERT NEXT or STORE if the current setup location is to be written over 7 Press ALT...

Page 106: ... or from a controiier via the GPIB bus The two digital acquisition modes are Peak Detect and Sample modes In Peak Detect mode the minimum and maximum levels of the input signal within the time represented by 1 25 of a division unmagnified are digitized as data pairs InSample mode the signal is sampled at a rate that produces 50 samples per graticule division 3 50 2252 Operators ...

Page 107: ...SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS 2252 Operators ...

Page 108: ......

Page 109: ...lies a voltage within the operating range of the instrument s power supply NOTE Ifyou notice an improper indication orinstrument malfunction 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 110: ... MENU System Controls MEASUREMENT MODES AH off Press TRACKING CURSORS CLEAR DISPLAY MENUS and three times to STORE RECALL ensure all off 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...

Page 111: ...check that the trace 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 baseiine trace parallel to the center horizontal graticule line Usea small straight blade screwdriver or alignment tool Probe Low Frequency Compensation Mis...

Page 112: ... center the PROBE ADJUST square wave signal 6 Check the square wave signal for overshoot and rolloff see Figure 4 1 If necessary use the special adjustment too 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 Vertical MODE bu...

Page 113: ...annel 2 vertical deflection system in the following procedure 1 Connect the two 10X probes supplied to the CH 1 and CH 2 input connectors 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 6 Set the bottom ofthe trace of the PROBE ADJUST square ...

Page 114: ...utton to call up the Time Measure ment Mode menu on the crt and select SEC I function for measuring time difference by pressing the Menu Select button opposite menu label 3 Align the reference cursor to the second vertical graticule line using the H OR DELAY TIME control both cursors are positioned together 4 Adjust the control for a reading of 800 0 fxs 5 Check that the cursors are eight division...

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Tektronix 2252, Operator'S Manual, Page: 55 / 114

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