Tektronix 2211 User's Manual
Contents
1. LF rej is displayed in the crt readout DC Couples all frequency components of the external signal to the trigger circuit DC to full bandwidth STORAGE CONTROLS STORE NON STORE Switch Selects either the NON STORE or the STORE waveforms for display The STORE acquisition system is turned off while NON STORE is selected so that the last waveform acquired in STORE mode remains in memory NON STORE is selected when the button is out STORE mode when pressed in PRE TRIG 25 75 Switch Soelecis either 25 or 75 pretrigger if either RECORD mode or SGL SWP ROLL made is selected the trigger position is shown on the display by an intensified dot Selects 75 pretrigger when out 25 when pressed in 18 ACQ SAVE CONTINUE Switch Stops the display from being updated when pressed in Ifthe display mode is ROLL the current acquisition is stopped immediately upon pressing the button Releasing the button causes the acquisition to continue if the display mode is RECORD the current display is held immediately upon pressing the button When the button is released the display is updated with the acquisition that was in progress when the SAVE button was pushed On returning to the CONTINUE mode previously acquired waveforms are no longer valid if the control settings were changed while in SAVE mode The next waveform acquired in CONTINUE mode will reflect any changes made When SAVE is selected SAVE appears at the2. Copyright 1988 Tektronix Inc All rights reserved Contents of this publication may not be reproduced in any form without the written permission of Tektronix inc TABLE OF CONTENTS INTRODUCTION 2 0s eees A E EE 2 OSCILLOSCOPE CONTROLS ee eens 4 CRT CONTROLS oa eis tamaiars aaa Maat 4 VERTICAL SYSTEM CONTROLS 5 HORIZONTAL SYSTEM CONTROLS 8 TRIGGER SYSTEM CONTROLS omar Obl STORAGE CONTROLS oon ccc e cece cea 18 CURSOR essssranrsessrersarasa arepe 20 REAR PANEL i per eae nates aw e 23 SIDE PANEL riant ie tasa KPEE EEEE k wees 24 CRT READOUT ocasrecims Sead pl oade Saale om 24 MAKING MEASUREMENTS 26 RECORD MODE ACQUISITION 26 ROLL MODE ACQUISITION 27 ACQUISITION SAVE REF ouaaa 27 cet te A OTE EA ESTA AAAS A e eaan at Satam 4 t at INTRODUCTION The 2211 is not only a powerful digital storage oscillo scope but also provides the analog capabilities of a com ventional non storage instrument In the digital storage mode the instrument is capable of sampling up to 20 MS s The acquisition is 4K points per channel all displayed on screen Waveform acqui sition is the digitizing and storing of the digital values that represent the analog waveform applied to the vertical inputs Save reference memory provides the user with the capability of storing either one 4K record or two 4K records one for each channel Pekbrenix 2211 mara sronnae osou s
3. bottom of the readout display Reference SAVE REF Switch Saves the displayed STORE mode waveform s into the reference memory The saved Reference waveform is displayed on the crt When the SAVE REF button is pressed previously saved waveform s are over writtan by the displayed acqui sition waveform s The Reference waveform s remain in memory when the instrument is switched between STORE and NON STORE modes Reference wave forms are NOT saved when the oscilloscope is turned off Reference DISPLAY ON OFF Switch Turns the stored reference waveform display on and off when in STORE mode Reference POSITION Control Allows vertical positioning of the saved Reference waveforms The Reference waveforms may only be positioned in the positive region from the ievel at which they were saved they cannot be positioned below that level 19 NOTE Any portions of the STORE waveform that are out of the display area will not be saved correctly in the Reference memory when SAVE REF is pressed The off screen portion will be clipped The clipping effect is seen when saving a waveform that is partially off the bottom of the crt display When the Reference waveform is positioned upward to bring it on screen the bottom of the display will be clipped The effect cannot be seen on the Reference waveforms clipped at the top because they cannot be positioned downwards CURSOR DELTA V Switch Activates the Delta Volts AV measuremen
4. signals are non inverted An invert symbol L is displayed with the CH 2 VOLTS DIV readout when CH 2 is inverted nyna Santee iO IEST OEY ERANA PO Non aoa tripe naeng oaee manng sse se e tees gk ne ADD ALT CHOP Selects the display mode for the two input signals when the CH 1 BOTH CH 2 switch is set to BOTH _ ADD Displays the sum of Channel 1 and Channel 2 input signals when BOTH is also selected The difference of the Channel 1 and Channel 2 input signals is displayed when the Channel 2 signal is inverted In STORE mode ADD the sum of CH 1 and CH 2 is acquired by Channel 1 ALT Alternately displays the NON STORE Chan nel 1 and Channel 2 input signals Switching between channels occurs during retrace at the end of each sweep ALT Vertical Mode is most useful for viewing both channel input signals at sweep rates of 0 5 ms per division or faster CHOP Switches the display between Channel 1 and Channel 2 vertical input signals during the sweep The chopped switching rate CHOP frequency is approximately 500 kHz in STORE mode both signals are acquired simul taneously There is no functional difference between ALT and CHOP except when VERT MODE trigger is selected When VERT MODE trigger is selected each channel is acquired alternately CH 1 and CH 2 VOLTS DIV Select the vertical channel deflection factors from 5 mV to 5 V per division in a 1 2 5 sequence The VOLTS DIV switch setting for both chan nels is di
5. 05 us to 10 us Error indication Error Indication 20 ps to 5 ms RECORD RECORD 10 ms to 50 ms RECORD ROLL 100X 1 s div to 5 s div OB1tstod5s ROLL 1X ROLL 100X 10 s div to 50 s div The Variable SEC DIV control has no effect In this range it a SEC DIV range above 20 zs Is selected while in STORE mode Sec Dlv Is displayed Indicating that an Illegat control setting has been selected The acquisition continues at the 20718 rate l bsec Div ls displayed in the crt readout At SEC DIV settings of 10 ms and below when the Variable SEC DIV contro is moved from the CAL position the selected SEC DIV setting is multiplied by 100 and the dispiay mode is ROLL l in STORE mode X Y on the SEC DIV switch selects external clock In this mode the acquisition rate is controlled by a signal applied to the EXTERNAL CLOCK connector located on the right hand side of the instrument l The SEC DIV switch setting is displayed in the crt readout Variable SEC DIV CAL Continuously varies the un calibrated NON STORE sweep time per division to at jeast 2 5 times the calibrated time per division set by the SEC DIV switch Full counter clockwise rotation increases the slowest sweep time per division to atleast 2 s The uncalibrated condition is indicated by a greater than symbol gt in front of the SEC DIV readout In STORE mode 10 ms per division to 0 5 s per division if the Variable control is switched out of CAL
6. control must be set correctly to produce a sweep an autotrigger is not generated if there is no trigger signal NORM Trigger Mode is especially useful in obtaining a stable display of low frequency and low repetition rate signais in STORE mode RECORD the display is updated once the acquisition is complete the last waveform acquired remains displayed until that time In ROLL the trigger signal is ignored for all the Trigger modes except in SGL SWP Trigger mode see Table 3 In non triggered ROLL made the display is continually updated at the digitization rate _ Table 3 ROLL Trigger Modes TRIGGER MODE ROLL MODE Trigger Operation P P AUTO Untriggered ROLL NORM Untriggered ROLL TV TRIG Untriggered ROLL LINE and FIELD SGL SWP Triggered ROLL TV FIELD Permits stable triggering on a television field vertical sync signal In the absence of an ade quate trigger signal the sweep or acquisition free runs The instrument otherwise behaves as in P P AUTO When TV FIELD is selected TV is displayed in the crt readout SGL SWP Selects single sweep operation In RECORD mode upon entering SGL SWP the last waveform acquired remains cispiayed Pressing the RESET bution rearms the trigger circuitry to accept the next triggering event When a trigger event is recognized the full record is acquired and the dis play updates If BOTH ALT Vertical Mode is selected along with VERT MODE Trigger SOURCE the trig gere
7. UNCAL position a sign appears after the value if the inputis AC coupled and BL appears if the channel bandwidth is limited ADD If the instrument is set for ADD Mode a sign appears in this field otherwise the field is blank CH 2 Vertical Deflection Indicates the current CH 2 VOLTS DIV switch setting A gt sign appears before the value if the switch is in the UNCAL position a sign appears after the value if the input is AC coupled BL appears if the CH 2 bandwidth is limited and a down arrow 4 is displayed if CH 2 is inverted Horizontal Deflection indicates the current value of the SEC DIV switch A gt sign appears before the value if the switch is in the UNCAL position Acquisition Status indicates whether the instrumentis in SAVE or ROLL mode This fieid is only active in STORE mode 25 The AT 1 AT AVX and associated Phase and Ratio cursors are displayed as vertical lines on the crt The AV AV2 AVY and associated Ratio cursors are dis played as horizontal lines on the crt MAKING MEASUREMENTS RECORD MODE ACQUISITION With the signal or signals to be measured applied to the vertical inputs SET STORE NON STORE to STORE in SET ACQ SAVE CONTINUE to CONTINUE out SET Vertical MODE switches to display either CH 1 CH 2 or BOTH CH 1 and CH 2 as you require for the applied signals SET Trigger MODE and SOURCE to the appropriate set ting for the desired triggering oper
8. age level of the amplifier s input signal 7 DC All frequency components of the input signal are coupled to the vertical amplifiers HORIZONTAL SYSTEM CONTROLS POSITION Coarse and Fine Position al the waveforms horizontally over a one sweep length range in X1 X10 or X50 Magnification In STORE mode with At cursors selected operation of the Horizontal Position controls also moves the cursors as they are attached to the waveform s SEC DIV Selects calibrated sweep rates from 0 5 s to 0 05 us per division in a 1 2 5 sequence of 22 positions The X Y position selects the X Y display in NON STORE Made The CH 1 input signal provides horizontal deflection for X Y displays and the CH 2 input signal produces vertical deflection in STORE mode the SEC DIV switch determines the acquisition and display modes sets the sampling rate and establishes the time scale factor of the displayed waveforms There are two storage modes with respect to the SEC DIV switch setting see Table 1 RECORD Mode Updates a full record of the acquired waveform each time a trigger event is recognized ROLL Mode Continuously acquires and displays signals The waveform display overwrites the previous acquisition from right to left Triggers are disabied except in SGL SWP Tabie 1 Storage Modes SEC DIV SEC DIV Variable Switch Seting CAL UNCAL X Y RECORD ROLL EXTERNAL Ciock de to Ciock de CLOCK 10 MHz to 4 kHz 0
9. ation SET 25 75 PRE TRIG to the desired amount of pretrigger to be acquired SET SEC DIV to the desired setting The switch setting must be in the range 20 ms div to 20 js div for RECORD mode SEC DIV settings faster than 20 us are not permitted in STORE mode ADJUST Trigger LEVEL and SLOPE for a stable display 26 ee om SET SAVE CONTINUE to SAVE when the signals are acquired ROLL MODE ACQUISITION SET PRETRIG 25 75 to 25 SET STORE NON STORE to STORE in SET SAVE CONTINUE to the CONTINUE position out SET Vertical MODE switches to display either CH 1 CH2 or BOTH CH 1 and CH 2 SET The SEC DIV switch to between 0 5 s and 10 ms _ SET The SAVE CONTINUE switch to SAVE when the waveform you want to measure has been acquired ACQUISITION SAVE REF REPEAT the ROLL or RECORD mode acquisition procedure PRESS Reference SAVE REF The signal s that had been acquired and displayed are now copied into the ref erence memory and the reference waveforms are displayed ROTATE The Reference POSITION control to vertically position the SAVE REF waveform apart from the original acquisition Subsequent acquisitions can then be com pared to the reference waveform 27 PRESS The Reference DISPLAY ON OFF button to turn reference waveforms display on or off Reference waveforms remain in memory upon selecting NON STORE mode 28 NAP MORNIN nmn ONE SRAM TA TaN NEN
10. core For flexibility in viewing events both before and after the trigger event two trigger points can be selected 25 and 75 Save reference memory can be simul taneously viewed on screen with the current acquisition for waveform comparison In non storage mode the instrument behaves as a con ventional 50 MHz analog oscilloscope The 2211 offers versatility in triggering high accuracy in both vertical and horizontal systems and excellent display quality In both store and non store modes the 2211 offers a cursor readout display to aid the user in making measurements CURSORS zan Arv vz amp t var VERTICAL a PORTION EEPOS f gt POSITION ci SHt POTH EZ NORM fer ADG ALT CHOP LE Es CH t VOLTSDIV CH 2 VOLTS DY rocut f ka 4D0Vpk ste RNS FANE SMSO ANATA MAAE SAAMAA Aon me aAA EE A AAA tanpa metta teaa te aae a OSCILLOSCOPE CONTROLS CRT CONTROLS INTENSITY Adjusts the brightness of all NON STORE displayed waveforms READOUT STORE INTENSITY Adjusts the bright ness of all STORE waveforms the CRT readout and the cursor displays This control is also used to either enable or disable the CRT readout and cursor display BEAM FIND Compresses the vertical and horizontal deflection to within the graticule area The traces are intensified to aid the user in locating traces that are over scanned or deflected outside of the ert viewing area FOCUS Adjust
11. d channel behaves as just described The non triggered channel display is not updated Pressing the RESET button again causes the second channei to update if the display mode is ROLL when SGL SWP is selected the display continues to roll because the trigger circuit is not armed When the RESET button is pushed to arm the trigger circuit the display continues rolling until the pretrigger portion of the RECORD is full The trigger point Indicator intensi fied dot then appears on the waveform and the TRIG D READY indicator lights The display continues to roll as data is acquired to fill the post trigger portion of the RECORD The amount of pretrigger information in a RECORD is set by the 25 75 PRETRIG button in SGL SWP if BOTH ALT Vertical mode is selected along with VERT MODE Trigger Source the triggered channel behaves just as described the non triggered 15 channel is bianked The triggered and non triggered channel alternates with each press of the RESET button RESET Arms the trigger circuit either for a single sweep in NON STORE SGi SWP or a single acquisition in STORE SGi SWP Triggering requirements are the same as in NORM Trigger Mode After the completion of a triggered NON STORE sweep or a STORE SGL SWP acquisition pressing in the RESET button rearms the trigger circuitry in NON STORE mode the next trigger event can then be accepted to start the sweep For STORE mods the pretrigger acquisition is sta
12. detent the SEC DIV switch setting is multiplied by 100 times see Table 2 The control has no effect in STORE mode at SEC DIV switch settings faster than 10 ms When the SEC DIV switch is set to EXT CLK the Variable SEC DIV control selects the display mode In the CAL position RECORD mode is selected EXT CLK range DC to 10 MHz Outof CAL detent ROLL mode is selected EXT CLK range DC to 4 kHz and ROLL is displayed on the ort MAG Selects the amount of horizontal magnification X1 X10 or X50 Magnification occurs around the center vertical graticule division in both NON STORE and STORE The crt SEC DIV readout will reflect the setting of both the SEC DIV switch and the magnification factor In STORE mode with Atcursors selected operation of the Horizontal MAG switch will also magnify the cursors as they are attached to the waveform s 10 Tabie 2 Extended SEC DIV Ranges SEC DIV Variable CAL UNCAL 10 ms div 1 s div 20 ms div 2 s div 50 ms div 5 s div 0 1 s div 10 s div 0 2 s div 20 s div 0 5 s div 50 s div PROBE ADJUST Provides an approximately 0 5 V negative going square wave volage at approximately 1 kHz for use in compensating voltage probes and checking the vertical deflection system The PROBE ADJUST output is not intended as a reference in checking either the vertical or horizontal accuracy of the instrument TRIGGER SYSTEM CONTROLS Trigger SLOPE Switch Selects either the positive or negative
13. itch also inverts the polarity of the internal CH 2 trigger signal when the CH 2 display is inverted When CH 2 is selected CH 2 is displayed in the crt readout EXT Selects external triggers The actual form these triggers take is selected by the second SOURCE switch When EXT is selected EXT is dis played in the crt readout LINE Routes a sample of the ac power line sig nai to the trigger circuit EXT 10 Attenuates the external signal applied to the EXT INPUT or Z connector by a factor of 10 before applying it to the trigger circuit EXT Routes an external signal applied to the EXT INPUT or Z connector to the trigger circuit EXT Z Routes the signal from the EXT INPUT or Z connector to the Z axis amplifier rather than the trigger circuit If EXT and EXT Z are both selected the signal applied to the EXT INPUT or Z connector is routed to both the trigger circuit and the Z axis amplifier 17 COUPLING Switch Determines the method of coupling for the signal applied to the trigger circuit AC input signal is capacitively coupled and the de component below 10 Hz from the trigger circuit is blocked AC is displayed in the crt readout HF REJECT Rejects attenuates the high frequency components above 30 kHz from the trigger circuit HF rej is displayed in the crt readout LF REJECT Rejects attenuates the jow frequency components below 30 KHz from the trigger circuit
14. n that trigger occurs and the indicator turns off when the RECORD is full The time needed to fill the pretrigger and post trigger portions of the RECORD depends on two things the sampling rate and the setting ofthe PRE TRIG 25 75 switch Until a trigger occurs the pretriqgger data is continually updated but the RECORD display is not updated until a complete new waveform is acquired MODE Switch Determines the NON STORE sweep and STORE acquisition triggering mode STORE mode triggering operation aiso depends on the position of the SEC DIV switch P P AUTO TV LINE In NON STORE mode the Trigger LEVEL contro range is set to the peak to peak limits of the input trigger signal Triggered operation occurs when the trigger signal has enough amplitude and occurs often enough 20 Hz and faster repetition ratejfor the peak detectors to determine the signal peaks If the trigger signal does not meet the requirements to produce a trigger event an autotrigger is generated and the sweep free runs In STORE mode in the absence of a trigger signal an autotrigger is generated The trigger point annunciator intensified dot is visible on the auto trigger generated trace when selected by the 25 75 pretrigger button At SEC DIV settings faster than 20 us triggered acquisitions occur under the same conditions as NON STORE mode P P AUTO triggering 13 14 NORM Permits triggering at al NON STORE sweep speeds The Trigger LEVEL
15. rted when the RESET button is pressed Variable HOLDOFF Controf Adjusts the NON STORE variable holdoff time NON STORE variable hoidoff starts at the end of the sweep STORE mode holdoff starts at the end of the acquisition cycle it ends when the waveform data has been transferred from the acquisition memory to the display memory and the pretrigger portion of the RECORD has been filled After STORE mode holdoff ends the next acquisition can be triggered after the next or current if one is in progress NON STORE hoidoff ends STORE mode holdoff can be much longer than the sweep time so that several NON STORE holdoff periods may have occurred during STORE holdoff time This ensures that STORE mode triggering is controllable by the Variable HOLDOFF control and will be stable if the NON STORE display is stable Trigger SOURCE Switches Determine the source of the internal and external trigger signai for the trigger generator circuits 16 CH 1 Trigger signal is obtained from the channel 1 input and CH 1 is displayed in the crt readout VERT MODE Trigger signals are obtained alter nately from the CH 1 and CH 2 input signals in ALT Vertical Mode In CHOP Vertical Mode the trigger signal source is the sum of the CH 1 and CH 2 input signal When VERT MODE is selected VERT is dis played in the crt readout CH 2 Trigger signal is obtained from the channel 2 input The NORM CH 2 INVERT sw
16. s for optimum display definition Once set proper focusing is maintained over a wide range of display intensity TRACE ROTATION Permits alignment of the trace with the horizontal graticule lines This controlis a screw driver adjustment that once set should require little attention during normal operation POWER ON OFF Turns instrument power on or off An LED indicator lights when power is on VERTICAL SYSTEM CONTROLS POSITION Control the vertical display position of the input signals In STORE mode the controis set the vertical position of the signals being acquired The POSITION controls do not reposition the SAVE mode waveforms but a POSITION control change is seen upon returning to CONTINUE mode In the NON STORE X Y display mode the CH 2 POSITION control moves the X Y display vertically CH 1 BOTH CH 2 Selects the vertical channel s for display in both NON STORE and STORE CH 1 Selects only the Channel 1 input signal for display BOTH Selects a combination of Channel 1 and Channel 2 signals for display CH 1 BOTH CH 2 switch must be in the BOTH position for ADD ALT and CHOP operation CH 2 Selects only the Channel 2 input signal for display NORM CH 2 INVERT inverts the Channel 2 display when in the CH 2 INVERT position With channel 2 inverted the oscilloscope may be operated as a differ ential amplifier when the BOTH ADD Vertical Mode is selected In NORM the Channel 2 display and trigger
17. slope of the trigger signal to start the sweep 11 Trigger LEVEL Control Selects the dc level that the Trigger signal must pass through to produce triggering The Trigger point is displayed as a voltage readout in the display field unless any of the following are selected Trigger Source CH 1 and CH 1 is AC coupled or uncalibrated Trigger Source CH 2 and CH 2 is AC coupled or uncalibrated i Trigger Source VERT and Vertical Mode is CHOP Trigger Source VERT and CH 1 is AC coupied or uncalibrated or CH 2is AC coupled or uncalibrated or CH 1 VOLTS DIV and MAG are not equal to CH 2 VOLTS DIV and MAG Trigger Source EXT Trigger Coupling is not set to DC Trigger Mode TV TRIG D READY Indicator A duai function light emitting diode LED indicator In P P AUTO NORM and TV FIELD Trigger modes the indicator turns on when triggering occurs In NON STORE for SGL SWP Trigger mode the indi cator turns on when the trigger circuit is armed awaiting a triggering event The indicator turns off again as soon as the single sweep compietes in STORE mode selecting SGL SWP and pressing the RESET button starts the sampling to fill the pretrigger portion of the waveform RECORD The TRIG D READY indicator does not come on until the pretrigger part of the RECORD is full When the indicator comes on the storage acquisition system is ready to accept a trigger 12 event Filing the remaining portion of the RECORD begins whe
18. sor Position control Cursor Position Control Positions the Delta time cursors vertical line when either the At or 1 At Measurement Mode is active When the AV Measure ment Mode is active the control positions the Delta Voltage cursors horizontal line Rotating the control clockwise moves the AV cursors upwards or the At cursors to the right Pushing the Cursor Position control will toggie the selection of the active cursor ON OFF Control When Cursor Measurement made is active depressing this button cancels the cursor measurement mode extinguishing the cursors and the cursor measurement display When the Cursor Measure ment mode is inactive depressing this bution enables the cursor measurement mode enabling the cursors and the cursor measurement display When the instru mentis first switched on the Readout display will indicate the current switch settings and AV1 will be operative if CH 1 or BOTH is selected or if CH 2 is selected AV2will be operative REAR PANEL Fuse Holder Contains the ac power source fuse See the rear pane nomenclature for fuse rating and line voltage range 23 Detachable Power Cord Receptacle Provides the connection point for the ac power source to the instrument Line Voltage Selector Mains switch Selects the line voltage range either 115 V or 230 V SIDE PANEL EXT CLOCK Provides a TTL compatible input for external clock signals to the storage acquisition circui
19. splayed in the crt readout 1X Front panel marking that indicates the deflec tion factor set by the VOLTS DIV switch when a 1X probe or a coaxial cable is attached to the channel input connector Variable VOLTS DIV CAL Provide uncalibrated variable deflection factors between the calibrated settings of the VOLTS DIV controls The VOLTS DIV sensitivity is reduced by at least 2 5 times at the fully counter clockwise rotation of the variable knob The switch detent at full clockwise rotation is the CAL position of the variable knob The uncalibrated condition is indi cated by a greater than symbo gt in front of the affected VOLTS DIV readout Pulling the Variable VOLTS DIV control multiplies the vertical gain by X10 and limits the bandwidth This latter condition is indicated in the readout display by the letters Be AC GND DC Input Coupling Selects the method of coupling the input signal from the CH 1 and CH 2 vertical input connectors to the vertical amplifiers AC Capacitively couples the input signal to the ver tical amplifier The de component of the input signal is blocked The lower 3 dB bandpass is 10 Hz or less Selection of AC input coupling is indicated in the readout by a tilde symbol in the associated channel s VOLTS DIV readout GND Grounds the input of the vertical amplifier providing a zero ground reference voitage display In GND the input coupling capacitor charges to the average dc volt
20. t The EXT CLOCK input signal is selected when the SEC DIV switch is in the EXT CLK position The maximum input frequency permitted depends on the dispiay mode RECORD or ROLL The mode is selected with the Variable SEC DIV control The frequency ranges are de to 10 MHz in RECORD mode Variable SEC DIV control in CAL detent and dc to 4 kHz in ROLL mode Variable SEC DIV controi out of the CAL detent position CRT READOUT The Readout system provides an alphanumeric display of information on the crt along with the waveform dis plays The readoutis displayed in two rows of characters One row is within the top graticule division the other within the bottom graticule division Cursor Type indicates which A function has been selected Possible values are AV1 AV2 AT 1 AT Ratio Phase AVX and AVY 24 Cursor Delta Value indicates the distance between the two cursors Units will depend upon the cursor type Trig Indicates that the following information relates to the Trigger point This field is used for information only Trigger Value indicates the value of the Trigger tevel This field is disabled in X Y mode and a number of other trigger modes as described on page 12 Trigger Source indicates the current Trigger Source Possible values are CH 1 CH 2 VERT and EXT CH 1 Vertical Deflection indicates the current CH 1 VOLTS DIV switch setting A gt sign appears before the value if the switch is in the
21. t function and cancels any other Delta measurement function when momentarily pressed The CRT readout displays the equivalent voltage represented by the separation between the two cursors with VOLTS DIV sealing defined by the setting of the selected vertical channel s VOLTS DIV switch The selection of the VOLTS DIV switch is defined by the operation of the AV switch such that when the AV function is inactive depressing the AV switch selects the VOLTS DIV switch previously selected for AV measurement mode CH 1 is selected after switch on and when the AV function is active and Vertical MODE is set to BOTH subsequent depressions of the AV button will toggle VOLTS DIV scaling between CH 1 and CH 2 VOLTS DIV switches If CH 1 is not displayed AV1 will not be enabled Likewise if CH 2 is not displayed AV2 will not be enabled Each 20 channel has its own independent cursors and channel selection is indicated in the Readout field The position of the cursors on the display are set by the Cursor Position control The DELTA Volts readout is displayed as a percentage ratio with five divisions corresponding to a 100 ratio if either one of the following conditions exist 1 The selected vertical channel is uncalibrated VOLTS DIV CAL control out of detent or 2 ADD is selected when the CH 1 and CH 2 deflection factors are not the same VOLTS DIV switches are at different settings or at least ane is uncalibrated The se
22. the SEC DIV and MAG switches When the SEC DIV switch selects the EXT CLK function the At function dispiays the difference between the two cursors in graticule divisions and the 1 At function displays it s reciprocal The positions of the cursors on the display are set by the Cursor Position controli in NON STORE if the SEC DIV CAL control is not in the detent position At cursor difference is expressed as a ratio with five divisions corresponding to a 100 ratio and 1 At as phase with five divisions corresponding to 360 degrees in STORE if the SEC DIV CAL control is not in the detent position the SEC DIV switch setting is multiplied by 100 times except at SEC DIV switch settings faster than 10 ms when the SEC DIV CAL control has no effect In STORE mode Delta t cursors are attached to the wavetorm s waveform based cursors Once on the required measurement points operation of both the Horizontal POSITION control and or the Horizontal MAG switch will result in the cursors moving with the waveform rather than independent of it TRACK INDEP switch Selects either the tracking or independent mode for the Cursor Position control When in the TRACK mode the difference between cursors 22 does not change with rotation of the Cursor Position con trol When the Cursor Position control is rotated both cursors move equally until the limit of either is reached if INDEP is selected the cursors are independently movable using the Cur
23. tting of the VOLTS DIV switch must take account of the X10 PULL function When the 2211 is in NON STORE X Y Mode the Deita VX and Delta VY cursors can be enabled via the Delta V switch The AV1 cursors become the AVX cursors and the AV2 cursors become the AVY cur sors and pressing the Delta V switch toggles between them The AVX cursors present a voltage measurement dependent upon the difference between the position of the cursors and the CH 1 VOLTS DIV setting Likewise the AVY cursors present a voitage measurement dependent upon the diffarence between the position of the cursors and the CH 2 VOLTS DIV setting The AVX cursors are similar in appearance to the time cursors i e ver tical lines on the crt whereas the AVY cursors are similar in appearance to the voltage AV1 AV2 cur sors If the channel VOLTS DIV switches are in UNCAL AVX and AVY measurements will be displayed as ratios with 5 screen divisions equal to 100 21 DELTA t 1 DELTA t Switch Activates the Delta Time At measurement function and cancels any other Delta measurement functions when momentarily pressed in When the At function is active momentarily pressing in the At button selects the 1 Deita t 1 At function Sub sequent operation of this button toggles between the At and 1 At functions The CRT Readout displays the time difference At or it s reciprocal 1 At between the two vertical cursors with SEC DIV scaling defined by the positions of
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