Tektronix 2247A Operator'S Manual Download Page 1

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Summary of Contents for 2247A

Page 1: ...TEK OPERATORS MANUAL 070 6373 01 Product Group 46 First Printing JAN 1989 2247A PORTABLE OSCILLOSCOPE OPERATORS Please Check for CHANGE INFORMATION at the Rear of This Manual COMMITTED TO EXCELLENCE ...

Page 2: ...gdom Ltd London G100000 Tektronix Guernsey Ltd Channel Islands HK00000 Tektronix Inc Hong Kong H700000 Tektronix Holland NV Heerenveen The Netherlands J300000 Sony Tektronix Japan l_ I Certificate of the Manufacturer Importer We hereby certify that the ___ 2_2_4_7_A_O S_ C_IL_L_O _S _C O_P E ____ AND ALL INSTALLED OPTIONS complies with the RF Interference Suppression requirements of Amtsbl Vfg 104...

Page 3: ...n des Par 2 Ziff 1 1 der Vfg 1046 1984 eingehalten werden C TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS viii LIST OF TABLES ix OPERATORS SAFETY SUMMARY x SECTION 1 INTRODUCTION PRODUCT OVERVIEW 1 I I e O I I I o I I o o o I O I I O O I O I I I I I I I O I I I I 1 1 I 1 1 Description I O I I I I I I I I I I I I I I I I IO o I I I I I I o I e I o I I I I I I I I I I O I 1 1 1 1 1 3 Standard Accesso...

Page 4: ...Track rf Cursors 3 31 Behavior for Horlzontal Mode Changes 3 32 Measurement Compatibility and Error Messages 3 33 Measurements In Single Sequence Mode 3 34 ii 2247A Operators fl II u I Page SECTION 3 OPERATORS FAMILIARIZATION cont Service Menu Features 3 35 Configure Menu 3 35 Self Cal Measurements 3 39 Internal Settings Menu 3 39 Store Recall Setup Features 3 40 Factory Stored Setups 3 42 Recall ...

Page 5: ...1 and CH 2 VAR VOLTS DIV Range 7 13 Low Frequency Linearity Check CH 1 and CH 2 Vertical Deflectlo u CH 3 and CH 4 Vertical Deflection Accuracy 7 16 ADD Mode and CH 2 INVERT Deflection Accuracy 7 17 Vertical ROSITION Range all channels 7 _ 18 CH 1 to CH 2 Signal Delay Match 7 19 CH 1 to CH 4 Signal Delay Match CH 3 to CH 4 Signal Delay Match 7 20 Ch 1 nd CH 2 Vertical Bandwldt 7 21 7 21 CH 3 and C...

Page 6: ... Peak Peak Peak to Peak Volts Accuracy 7 53 25 MHz Peak Peak and Peak to Peak Volts Accuracy 7 54 100 MHz Peak Peak and Peak to Peak Volts Accuracy 7 54 Gated Volts Accuracy 7 55 COUNTER TIMER 7 56 Period 7 56 Width 7 57 Rise Time Accuracy 7 59 vi 2247A Operators Page SECTION 7 PERFORMANCE CHECK PROCEDURE cont EXTERNAL 2 AXIS AND PROBE ADJUST AND FRONT PANEL SETUP FUNCTIONS 7 61 Check External 2 A...

Page 7: ...rement 5 13 5 6 Time difference between the two delays 5 17 5 7 A and B Track Trig Lvi cursors 5 18 5 8 Setting a specific trigger level 5 21 5 9 Eliminating common mode signals 5 24 6 1 Maximum Input voltage vs frequency derating curve for the CH 1 CH 2 CH 3 and CH 4 Input connectors 6 27 6 2 Dimensional drawing standard cabinet 6 33 6 3 Dimensional drawing rackmount cabinet 2240F 1R 6 34 viii 22...

Page 8: ... 250 V rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor In the power cord is es ential for safe operation Grounding the Product This product Is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired receptacle before making any conn...

Page 9: ...ers 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 xii 2247A Operators SECTION 1 INTRODUCTION J 2247A Operators ...

Page 10: ...and time measurement system with SmartCursors A counter timer CIT is Integrated into the trigger sys tem to provide many automated counting and timing measurements with high accuracy Other features Include single button automatic front panel setup and a menu driven store recall setup function A menu driven service moae provides for configuring of ertain menu and readout displays internal calibrati...

Page 11: ...a time phase rise fall time and propagation delay using an Internal or external frequency standard Counter timer measurements can be averaged to increase the number of displayed digits and measurement trigger points can be Indicated with cllrsors on screen Positionable cursors allow absolute voltage voltage difference time dif ference frequency and phase measurements SmartCursors visually track vo...

Page 12: ...ord must match the power source outlet if It does not con tact your Tektronix representative or local Tektronix Field Office See Figure 1 2 for optional power cords available 1 4 2247A Operators r I I I I I Plug Configuration Option U S Std A1 A2 A3 A4 AS Power Cord Plug Type U S 120V EURO 220V UKa 240V Australian 240V North American 240V Switzerland 220V Line Voltage 120V 220V 240V 240V 240V 2 20...

Page 13: ...cked and or replaced by a qualified service person The Instrument can still be used for accurate measurements by running the SELF CAL MEASUREMENTS routine from the SERVICE MENU after the Instrument has warmed up for at least 20 minutes To run the SELF CAL MEASUREMENTS routine press the top and bottom menu Item select buttons Press down arrow button to underline SELF 1 6 2247A Operators II II I I I...

Page 14: ...SECTION 2 CONTROLS CONNECTORS AND INDICATORS 2247A Operators ...

Page 15: ...trol Adjust 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 READOUT Control Adjusts the brightness of the crt reado_fJt display Includes all alphanumerics and cursors SCALE ILLUM Control Adjusts the illumination level of the graticule NOTE Life of the graticule illumination l...

Page 16: ...on the display chopped or alternating Except for CHOP ALT modes pressing an _ unlit mode button turns on the mode and pressing a lit button turns off the mode CHOP is selected when the CHOP ALT button is lit ALT Is selected when the button Is not lit CH 1 CH 2 CH 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 ...

Page 17: ...is in the fully clockwise detent position How ever if a front panel setup had been recalled from the Store Recall Setup memory it is possible for the VOLTS DIV settings to be calibrated o r uncalibrated with the VOLT DIV VAR antral in any position When the con trols are rotated normal variable operation returns UNCAL Indicator Light when either CH 1 or CH 2 VOLTS DIV set tings are uncalibrated var...

Page 18: ... probes A signal con nected to the CH 1 OR X Input connector produces the horizontal deflection X Axls In the X Y horizontal mode Any of the vertlcal signal channels or ADD can provide vertlcal deflection Y Axls for an X Y display PROBE ADJUST Connector Outputs a 0 5 V square wave slgnal at about 1 kHz Into a 1 Mil load for compensating voltage probes and checking the vertical deflection accuracy ...

Page 19: ...t to A Trigger ALT Alternates between A sweep with an Intensified zone repr sentlng B sweep and B delayed sweep Both A and B SEC DIV switch settings are displayed In the crt readout but only the B can b adjusted Whenever ALT MODE Is selected the A B SELECT switch Is set to B Trigger The B sweep speed cannot be set slower than the A sweep speed attempting to do so forces the A sweep speed to follow...

Page 20: ...brated SEC DIV setting The VAR control extends 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 2 10 2247A Operators Controls Connectors and Indicators NOTE Normally the SEC DIV settings are calibrated when the VAR control is in th...

Page 21: ...ected and unlit for either B source If no menu Is being displayed the second from top readout line will show which of the three trigger sources Is selected along with slope as shown below 2 12 2247A Operators FREQ RATIO A source B source 1 B source 2 Controls Connectors and Indicators TRIG SELECT A SLOPE t TRIG SELECT B chx SLOPE t TRIG SELECT B chy SLOPE t Chx Is the numerator channel and chy Is ...

Page 22: ...a TV Trigger MODE B Trigger SLOPE will automatically be set to match A Trigger SLOPE if TV LINE B Trigger MODE Is selected After A SLOPE has been preset If A Trlgger MODE is then taken out of a TV Trigger MODE A SLOPE Is set back to Its previously selected non p eset value If while doing this B Trigger MODE was still In TV LINE 1 the B SLOPE will be set automatically to match A SLOPE If B SLOPE wa...

Page 23: ...he CONFIGURE menu see Service Menu Features In Section 3 B Trigger Modes AUTO LEVEL Sets the range of the Trigger LEVEL control to the 10 and 90 levels of the B Trigger source signal sets the Trigger LEVEL and triggers the B sweep and CIT 2 16 2247A Operators Controls Connectors and Indicators NOTE The B sweep operates in RUNS AFTER mode when the trigger source signal amplitude is too low or the f...

Page 24: ...t 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 de and all frequency components of a triggering signal t o the trigger circuitry DC coupling Is useful for most signals but It Is especially useful for providing a stable display of...

Page 25: ...s time related to the displayed signal to obtain a fixed Intensity modulated crt display EXT COUNTER TIMER TIME BASE INPUT Connector Connects an external reference oscillator signal to the Counter Timer This signal must be 1 5 or 10 MHz 2 with at least 1 Volt p p ampli tude The Counter Timer will automatically switch to this signal when present and provide an indication in the readout Fuse Holder ...

Page 26: ...ent mode such as cursor time does not require a measure ment channel to be set When a SE T MEAS MT GHANNEL menu Is displayed changing the Horizontal MODE except between ALT and B clears the menu LAST MEAS MT Recalls the last active measurement mode to the dis play and resets the measurement clilannel If the last active measurement mode Is already displayed when the LAST MEAS MT button Is pressed o...

Page 27: ...ALL menu factory settings default or the RECALL ONLY menu Is displayed depending on how you set the SERVICE mode CONFIGURE menu See Service Menu Features In Section 3 to set CONFIGURE menu AUTO SETUP Button Press to automatically set up the front panel controls to produce a usable crt display Setups are based on the characteristics of the applied signals The voltage and frequency characteristics o...

Page 28: ...11 SECTION 3 ft I OPERATORS FAMILIARIZATION I t 2247A Operators ...

Page 29: ... and ten horizontal major divisions Major divisions are further divided Into five subdivisions of O 2 division each marked along the center vertical and horizontal gratlcul lines Percentage marks for rise time and fall time measurements are marked on the left side of the graticule Vertical deflection factors and horizontal timi g are cali brated to the graticule so that accurate measuremehts can b...

Page 30: ...waveform as preclsely as possible on one of the major graticule marks to be used as a measurement reference point Readout Display The crt readout display Indicates how the instrument controls are set up No physical markings are on the rotating switches and control knobs to Indicate the control setting A key to the location and type of readout infor mation displayed is illustrated in Figure 3 2 3 2...

Page 31: ...s must be terminated at both ends In their characteristic Impedance to prevent signal reflections within the cable Use suitable Impedance matching devices 3 4 2247A Operators Operators Familiarization External Triggering Any of the four vertical channels in the 2247A can be used as a source of A and B trigger signals When you need a trigger signal source different from the one derived from display...

Page 32: ... must be terminated at both ends In their characteristic Impedance to prevent signal reflections within the cable Use suitable Impedance matching devices 3 4 2247A Operators Operators Familiarization External Triggering Any of the four vertical channels in the 2247A can be used as a source of A and B trigger signals When you need a trigger signal source different from the one derived from displaye...

Page 33: ...ons Including TRACK MEASMT cursors and turns off the TRACK TRIG LVL and TRACK rh cursors Depending on what menus and measurements are displayed at the time you may have to press the CLEAR DISPLAY button as many as three times to completely clear the display If a menu Is on pressing the CLEAR DISPLAY will remove the menu and return the display to a normal operating mode Measurement functions are tu...

Page 34: ...iliarization SET SOURCE CHANNEL CH1 CH2 CH3 CH4 ADD TO SOURCE CHANNEL MENU SET SOURCE CHANNEL CH1 BACK TO SOURCE CHANNEL MENU CH2 CH3 CH4 ADD Frequency Ratio Measurement Channel Menus SET START CHANNEL CH1 CH2 CH3 CH4 ADD TO STOP CHANNEL MENU SET STOP CHANNEL CH1 CH2 CH3 CH4 ADD BACK TO START CHANNEL MENU Propagation Delay Measurement Channel Menus Recalling the last Measurement Mode When an activ...

Page 35: ...yed at the top of the screen A measurement Is canceled with no message when the Horizontal Mode Is changed to a mode Incompatible with the active measurement mode See Table 3 1 In Behavior for Horizontal MODE Changes for compatible modes If a PEAK PEAK or PK PK Volts measurement Is selected when hori zontal mode Is either ALT or B Cursor Knob Allocation Menu 1 Is displayed 3 10 2247A Operators I I...

Page 36: ...SGL SEQ Trigger MODE Is selected If a gated voltage measurement is selected after switching to SGL SEQ TRIGGER MODE the message M NOT ALLOWED IN SSEQ Is displayed for about two seconds GATED PEAK Measures the most positive screen relative voltage In the gated Intensified portion of the waveform GATED PEAK Measures the most negative screen relative voltage In the gated Intensified portion of the wa...

Page 37: ...rn off the MENU MEASUREMENT and TRACK TRIG LVL and TRACK rh cursors in a priority scheme of three levels MENU first MEASUREMENT second and TRACK TRIG LVL and TRACK rh cursor last The highest level being displayed I turned off each time the CLEAR DISPLAY button is pressed 3 14 2247A Operators I I I Operators Familiarization TRACK MEASMT Press to enable or disable the Channel 1 or Channel 2 Voltmete...

Page 38: ...e ET character above It I SEC I Press to measure the equivalent time difference between the two vertical cursors displayed In the A Horizontal MODE or the two time delays In ALT or B Horizontal mode T he position of both cursors or both delays Is controlled by the I OR DELAY control the position of the delta cursor or the delta delay Is controlled by the 41 control The measured time difference bet...

Page 39: ...lected measurem nt will start up using the previously selected mode If I I ls selected In this menu the cursor knobs will control th tw time cursor positions as In A horizontal mode except that thes cur r positions are scaled to the B sweep time div setting The I ORD LA control knob positions both cursors reference and delta tog and the I control knob positions the Independent delta cursor 3 18 I ...

Page 40: ...are calculated and set from the reference lev I and the time Interval Is measured and displayed During RISE FA L measurements all B Trigger mode source and coupling LEDs r turned off and these parameters may not be set The B Trigger I v I may not be adjusted when A is selected the usual modes slop couplings and level may be controlled B Trigger SLOPE Is also not settable B SLOPE LED will be on If ...

Page 41: ...E or FALL measurement has been started up When selected the trigger levels are recomputed for the 20 and 80 points between the 0 and 100 reference levels Selecting either TRIG 10 90 or TRIG 20 80 does not cause another 3 22 2247A Operators I Operators Familiarization peak acquisition to occur Instead the old 0 and 100 reference levels are used I SET REF I may only be selected after a rise or fall ...

Page 42: ...See the CIT Control M discussion for the description of this function 3 24 l Operators Familiarization Counter Timer Press the COUNTER TIMER button to call up the CIT measurement choices In the CTR TIMER menu selecting a measurement will cause the menu to disappear If menus are configured to clear after selection Selecting TOTALIZE causes the totalize RESET label to appear by the top menu Item but...

Page 43: ...rig was detected after timeout while trying to measure chy frequency CHx 0 01Hz CHy 0 01Hz 99999999 Operators Familiarization Frequency of chx signal less then 0 01 Hertz timeout disabled Frequency of chy signal less then 0 01 Hertz timeout disabled Frequency ratio greater th n 99999999 TO GATED MEASMT MENU Causes CTR TIMER PG 2 menu to appear Gated CIT Measurement Menu Page 2 When the CTR TIMER P...

Page 44: ...ill make one trial measurement using the fixed measurement time Interval and calculate and dlspl y as many fully resolved digits as possible Based on the results of this measurement It Is determined whether or not another digit of reso lution Is possible It Is possIble if 1 The number of digits displayed after the trial measurement Is at least 1 less than the maximum number of digits displayable f...

Page 45: ...s actually 99 999999 seconds Conditions for Cursors Display The following Information Is an aid In understanding the order In which th menu measurement cursors are displayed Measurement Cursors One or two measurement cursors may be displayed if any one of th fol lowing conditions Is met VOLTMETER CH1 CH2 TRACK MEASMT Is underllned n measurement source channel Is on and the VOLTS DIV VAR control In...

Page 46: ...urements except DC cannot be made when the signal Is larger than the range of the B trigger level The displayed error message Is OUCH TURN VOLTS DIV CCW NOTE When making DC measurements overranged signals will not cause an error message to be displayed but can display incorrect voltage readings To obtain accurate DC readings keep the waveform within the graticulf limits The Channel 1 or Channel 2 ...

Page 47: ...I In ALT or B Horizontal MODES one measurement cycle wlll be performed and the result held In the readout display If readout Is con figured 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 MServlce M...

Page 48: ... NO clears the menu from the display when some store recall setup functions are selected Selecting YES keeps the Store Recall Setup menu on the screen when using the store recall setup functions The menu can be removed at any time by pressing the CLEAR DISPLAY button once KEEP READOUT ON IN SGL SEQ Factory Settings default is NO Selecting NO wlll keep the readout off in Single Sequence Trigger Mod...

Page 49: ...ure menu Is exited If NO is selected a second question is presented PRESET TV TRIG SLOPE FOR SYNC Factory Settings default Is NO Selecting YES will cause the trigger slopes to preset to when TV trig mode is selected and the configure menu Is exited If NO Is selected the scope will not use a preset slope when a TV trig mode is selected When the flnal question Is answered the SERVICE MENU display re...

Page 50: ...higher or low r numbered setups In a test sequence If more than one sequence of setup Is stored a menu Item NEXT SEQ also appears which allows you to change sequences See the Recall Only Menu discussion When configured for full access to the STORE RECALL SETUP featur stored setups can be recalled altered deleted or arranged In sequenc This configuration Is used when first Installing the setups and...

Page 51: ... A press of the SEQUENCE menu select button displays the recall only menu for sequencing through the front panel setups for a series of measurements As with all 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 ...

Page 52: ... record In the current sequence If the displayed record Is the first In a sequence pressing the down arrow button will recall the current record 3 44 2247A Operators I I I Operators Familiarization NEXT SEQ Changes the current record number to the first step of the next sequence If presently In the last sequence pressing NEXT SEQ will change the current record number to 01 This Item will not appea...

Page 53: ...pressed the first record of the current sequence will be recalled A sequence starts with either 01 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 R call Only M...

Page 54: ...the record is completed SETUP xx Displays the setup number from 01 through 20 of the displayed record as on page 1 of Store Recall Setup menu When the number is underlined with the I OR DELAY control the displayed record can be changed with the I control This allows specific records to be reviewed and altered Status of Record Indicates the status EMPTY END SEQ DELETED or blank of the currently dis...

Page 55: ...STORE RECALL SETUP button to call up the Store Recall Setup menu Rotate the t control to review the stored setups Determine whether there are enough EMPTY locations to store all of the setups In your sequence There are a total of 20 locations available It Is a good Idea to use only 19 and leave the 20th open so that the system will have a place to store the last deleted file for recovery when nece...

Page 56: ... 0 SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS 2247A Operators ...

Page 57: ...upplies a voltage within the operating range of the Jnstrument s power supply NOTE If you notice an improper Indication or instrument ma function during these procedures refer the Instrument to a qualified ervice person Initial Setup The following procedure may be used to set up front panel controls when the instrument ls first turned on or when a signal is not being applied to the Input connector...

Page 58: ...sired see NOTE As desired As desired 3 Press the AUTO SETUP button NOTE Normally the Auto Setup of the display is sufficient for measurement purposes If further waveform enhancement Is needed use the appropriate front panel controls to adjust the display For Auto Setup acti n see Appendix A Trace Rotation Adjl Jstment 1 Perform the 0 Initial Setup p ocedure Position the trace vertically to align I...

Page 59: ...IV setting to 0 1 V 10 mV with probe discon nected and vertically center the PROBE ADJUST square wave signal 9 Repeat Steps 5 and 6 for the second probe on the CH 2 BNC input con nector 4 4 NOTE Refer to the Instruction manual supplied with the probe for more detailed information about the probes and the adjust ment procedure 2247A Operators I I I I 1 I Operator Checks and Adjustments CORRECT FLAT...

Page 60: ...ols 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 MEASUREMENTS button to call up the Time Measure ment Mode menu on the crt and select I SEC 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 I OR DELAY co...

Page 61: ...urements The CH 1 CH 2 Voltmeter measurements are continuous measurements of the DC PEAK PEAK or PK PK values of an applied signal The measurement value Is displayed In the crt readout Measurement tracking and or ground tracking cursors may be displayed to give the user Instant _ feedback about where on the applied signal the r ieasurement Is being made and the location of ground level NOTE l J A ...

Page 62: ...the CLEAR DISPLAY button once to remove It from the display See the SERVICE Menu discussion In Section 3 for further details 5 2 2247A Operators Basic Applications NOTE The TRACK MEASMT cursor may be displayed with the waveform Pressing CLEAR DISPLAY in the Initial setup re moves the measurement tracking cursor from the display and also cancels the measurement but does not disable the feature once...

Page 63: ...layed NOTE Only two of the possible three available selections may be displayed on a priority basis TRACK MEAS MT has the highest priority followed by TRACK TRIG LVL and TRACK min that order Also the TRACK TRIG LVL cursors may Qnly be displayed on the Trigger SOURCE signal The TRACK MEASMT cursor may be directed to either CH 1 or CH 2 Input signal without regard to the trigger signal SOURCE 2 Adju...

Page 64: ... Difference Use the following procedure steps as a guideline In making voltage dif ference measurements using the positionable cursors 1 Apply the signal to the Input connector s 5 6 2247A Operators Basic Applications NOTE For triggering to be set up properly when the AUTO SETUP button Is pressed connect the trigger source signal to the lowest numbered channel that will be turned on 2 Set VERTICAL...

Page 65: ...using the rh VOLTS I cursors The ground tracking cursor Is fixed at the ground level of the applied signal and the independent cursor above or below ground as necessary to measure the voltage at the cursor position Use the following procedure steps to set up to measure ground referenced voltages 1 Apply the signal to the Input connector s 2 Set VERTICAL MODE Horizontal MODE CH 1 CH 2 COUPLING 3 Pr...

Page 66: ...ng time difference measurements as a guideline and select the PROPDLY menu Item from the Time measurements menu If desired the trigger level may be adjusted by selecting the B Trigger and adjusting the Trigger LEVEL control Rise Time Measurements Rise time and fall time measurements can be made automatically by selecting the appropriate menu Item In the Time measurements menu Use the procedure for...

Page 67: ...veform period 360 degrees 8 Position the first vertical cursor to the point that the reference waveform crosses the center horizontal graticule line in the positive direction see Figure 5 5A The Horizontal POSITION control may be used as necessary to center the waveform period in the viewing area 9 Position the delta cursor to the second positive crossing of the center horizontal graticule line by...

Page 68: ... Horizontal Mode the TIME measurement mode provides two Intensified zones on the A trace There are also two associated B 5 14 2247A Operators l I Il I l Basic Applications delayed traces matching the intensified zones A direct readout of the delay difference between the two zones is displayed in the top line of crt readout use the following procedure steps as a guideline for making delta time dela...

Page 69: ... line The time difference between the two points of Interest 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...

Page 70: ...met The labels for the Trigger Level cursors are A TL B TL Bb TL CHx TL CHy TL START TL STOP TL 10 TL 20 TL 80 TL 90 TL A trigger level B trigger level B delta trigger level B CHx trigger level B CHy trigger level B start trigger level B stop trigger level Rise fall 10 trigger level Rlse fall 20 t rlgger level Rise fall 800 c trigger level Rise fall 9 0 trigger level The A and B Trigger LEVEL read...

Page 71: ...s To enable either or both of these it is necessary to re enter the Cursor Volts menu and reselect them The TRACK MEASMT cursors are also turned off by the CLEAR DISPLAY button but the function Is not turned off the TRACK MEASMT cursor s will be displayed again when a CH 1 CH 2 Voltmeter measurement Is called up 5 20 2247A Operators Basic Applications Setting Trigger Level The trigger level readou...

Page 72: ...ime If wanted by the user Wh n the VOLTS DIV switches of CH 1 and CH 2 are both set to the same setting the total deflection factor In the ADD mode Is equal to the deflec tlon factor Indicated by either VOLTS DIV readout The I VOLTS I 5 22 2247A Operator Basic Applications cursors may be used to make voltage measurements on the ADD trace If either CH 1 or CH 2 Is displayed along with the ADD trace...

Page 73: ... _ 10 I _ v A CH 1 AND CH 2 SIGNALS I 1 90 L I 1 1 1 r B RESULTANT SIGNAL 6556 35 Figure 5 9 Eliminating common mode signals 2247A Operators r I I I I I I Basic Applications h Select ADD and then turn on CH 2 INVERT unless cancellation signal Is already 180 out of phase Turn off the CH 1 and CH 2 displays and slightly readjust the CH 2 VOLTS DIV VAR control for maximum cancellation of the line fre...

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