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Tektronix 2245A User's Manual

1. 2245A Operators Operators Familiarization BASIC OPERATION This subsection contains the basic operating information and techniques that should be considered before attempting any measurements For ioca tion and function of instrument controls connectors and indicators see CONTROLS CONNECTORS AND INDICATORS Section 2 of this manual Readout Display The crt readout display indicates how the instrument controls are set up No physical markings are on the rotating switches to indicate the control setting A key to the location and type of readout Information displayed is iliustrated in Figure 3 1 Graticule The graticule is internally marked on the ort face to provide parallax free viewing and enable accurate measurements see Figure 3 2 The graticule is marked with eight vertical and ten horizontal major divisions Major divisions are further divided Into five sub divisions of 0 2 division each marked along the center vertical and horizontal graticule lines Percentage marks for rise time and fali time measurements are marked on the left side of the graticule Vertical deflection factors and horizontal timing are cali brated to the graticule so that accurate measurements can be made directly from the crt The waveform displays are calibrated to the crt graticule markings for making quick and very accurate measurements of waveform parameters Voltage measurements are done by counting the vertical graticule divisions
2. 7 46 2 E VOLTS 3 Cursor ACGUIACV ann 7 47 EXTERNAL Z AXIS PROBE ADJUST AND AUTO SETUP FUNC TIONS t Check External Z AXIS input oca ero OR aces 7 48 2 TROBE ADJUST OUIDUE iria a 7 49 3 AUTO SETUP Functional ChecK lt lt lt 7 49 OPTION 15 is Signal OUIDHE cows cc ed e eR ENGEL RR S 7 50 le AGATE OUIDULU fiancee teks eds 7 51 2245A Operators Pf Performance Check Procedure DISPLAY Equipment Required See Table 7 1 Time mark generator 50 O BNC coaxial cable 50 BNC termination 1 TRACE ROTATION a Set READOUT Intensity A INTEN For a viewabie readout For a viewable trace VERTICAL MODE CH 1 CH 1 VOLTS DIV 0 1 V CH 1 COUPLING AC SCOPE BW Off A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER SOURCE VERT TRIGGER CPLG DC TRIGGER SLOPE _f positive going TRIGGER HOLDOFF Min TRIGGER LEVEL 12 o clock Horizontal MODE A Horizontal POSITION 12 o clock A SEC DIV 2 us CLEAR MEAS MT Press to remove measurement cursors FOCUS For best defined display b Position trace vertically to the center graticule line e CHECK trace rotation control range is adequate to align trace with center graticule line using a small stralght bladed alignment tool d ADJUST trace parallel to center horizontal graticule line 7 8 2245A Operators Performance Check Procedure 2 Geometry a Connect time mark generator TG 501 to CH 1 via a 50 Q BNC coax ial cable
3. 9 o ko 4 9 9 w P B WX Bo G o4 4 n A trigger Modes susc ect Een ED DEDE ER S pee ne s Ra B TEO Modos eam ee Y dicia ce eat Rear Panel E 4 4 dd 9 9 9 9 nos o9 4 3 2245A Operators SECTION 3 OPERATORS FAMILIARIZATION BASIC OPERATION LL AR TEENIE EAEE ETE 3 1 Readout Display 0 a ient 3 1 Grati ul 1r ae Rede 3 UR ea Ea 3 1 Connecting Input Signals rear 3 3 Grounding ya DAR A RR AC ACA Role ORE CR o cb 3 3 o Liliana EOI PER aS 3 4 Coaxial Caples errre NEA AAN de Redes Se oris deo ird 3 4 External Triggering eee hh Rh 3 4 Auto Sat p i vili er REPRE EE AGUIRRE in oe 3 5 MIN SETUP A Less Va o Yon CO SU PERIODE e EI 3 5 MEASUREMENT SYSTEM e ra tn nn nn ebene 3 5 Cursor Volts Measurements lilio ear harm ntt 3 5 Time Measurements eerta hh mmn ntn 3 6 Behavior for Horizontal Mode Changes enn nn 3 7 Measurement Compatibility and Error Messages o oooooo oco 3 8 Measurements in Single Sequence Mode e nnn nn 3 8 Service Menu Features uber da EEE TEENE 3 9 Configure Men i09 LEE XA xU Eam E MERE dk d dedo seas Mnt de 3 10 Self Cai Measurements lae hh rer hh 3 11 Internat Settings Menu 5 2 0 sr OC ri 3 12 SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS Introd OPE caer dr do eae ei NS AAA a 4 1 initial Belli cuan vie b EID DRE RICE Im de utes 4 1 Auto Setup Function sus nen Ar 4 2 Trace Rotation
4. 7 13 CH 2 INVERT Trace Shift 5 2 u ii CERES 7 13 CH 1 and CH 2 VAR VOLTS DIV Range lesse ee ee 2713 Low Frequency Linearity rr ee DS CH 1 and CH 2 Vertical Deflection Accuracy A is CH 3 and CH 4 Vertical Deflection Accuracy Us sud ux as PS ADD Mode and CH 2 INVERT Deflection Accuracy PEE 7 17 Vertical POSITION Range all channels l l 7 18 CH 1 to CH 2 Signal Delay Match essen 7 19 CH 1 to CH 4 Signal Delay Match eie n n 7 19 CH 3 to CH 4 Signal Delay Match ooo ens 7 20 Ch 1 and CH 2 Vertical Bandwidth o ooooocooommmo o roo 7 21 CH 3 and CH 4 Vertical Bandwidth oooooooommmsronoo 7 22 2245A Operators iti SCOPE BW Bandwidth Limit Accuracy sse n n n n n 7 22 Common Mode Rejection Ratio 7 23 Channel Isolation o oc ooooosonrrrasarraro a ehh hat ad 7 24 AC Couplied Lower 3 dB Point 7 25 Vertical ALT and CHOP Modes 7 26 BEAM FIND Functional Check 7 26 A and B Trace Separation o0ooocorocranco naar ras 7 27 TRIGGERING oi DADA e 7 28 500 Hz Trigger Sensitivity iic n n n tnn 7 27 500 kHz Trigger Sensitivity LL 7 28 25 MHz Trigger Sensitivity Le 7 30 150 MHz Trigger Sensitivity ee eee nt nn 7 31 Single Sweep Mode ooooooocrorrororo cere ee eee nnn 7 32 Trigger LEVEL Control Range 0o0ooococoorccaranr n n tnr 7 33 TV Field Trigger Sensitivity Lo 7 34 TV Line Trigger Sensitivity Lo 7 34 Line
5. 7 42 2245A Operators Performance Check Procedure 8 Delay Time Accuracy a Set Horizontal MODE ALT B SEC DIV 10 us TRACE SEP Fuliy CCW maximum downward position CH 1 POSITION To display both the ALT and the B Delayed Traces b Position the intensified dot to full left position counter clockwise rota tion of the je OR DELAY control c Align the leading edge of the time marker displayed on the B trace to the left most first graticule line using only the Horizontal POSITION control d CHECK that the readout is 0 000 ms e Position the intensified zone to the second time marker and align the leading edge of the time marker displayed on the B Trace to the left most first graticule line using only the le OR DELAY control Using the Readout Accuracy Limits given in Table 7 4 check the delay time accuracy f Repeat the procedure for the 3rd through 10th time markers Table 7 4 Delay Time Accuracy Time Marker Readout Accuracy Limits 1st 0 000 ms 2nd 0 945 ms to 1 055 ms 3rd 1 940 ms to 2 060 ms 4th 2 935 ms to 3 065 ms 5th 3 930 ms to 4 070 ms eth 4 925 ms to 5 075 ms 7th 5 920 ms to 6 080 ms Bth 6 915 ms to 7 085 ms 9th 7 910 ms to 8 090 ms 10th 8 905 ms to 9 095 ms 2245A Operators 7 43 Performance Check Procedure to 10 Delay Time Position Range Set time mark generator for 0 1 ms Set A SEC DIV 1 ms B SEC DIV 5 us je on DELAY control 70 000 ms CHECK that the intensi
6. Fuse Holder Contains the primary power fuse 2245A Operators 2 17 Controls Connectors and Indicators CAUTION TO AVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE GROUNDING CONDUCTOR MUST BE CONNECTED TO GROUND DO NOT REMOVE COVERS REFER SERVICING TO QUALIFIED PERSONNEL DISCONNECT INPUT POWER BEFORE REPLACING FUSE FOR CONTINUES FIRE PROTECTION REPLACE ONLY WITH SPECIFIED TYPE AND RATED FUSE TO REMBVE POWER CORI POWER MAX WATTS 00 BISCONNECT PEIG AND MAX VA 155 RATAYE RETAINER CLIP 80 FREQUENCY 48 440H2 EXT 2 AXIS INPUT 2184 DECREASES INTENSITY gt 3 Ay MANKS X Y 2 i Aon B SWEEP THES INSTSUMENT MAY BE PROTECTEG BY ONE JR MERE US GR FOREIGN PATENTS OR PATENT APPLE ATIONS INFORMATICA PROWIRED ON REGUEST Figure 2 6 Rear panel connectors and fuse Power Cord Receptacie Connects the ac power source to the instrument power supply The power cord protective ground connection is connected to the exposed metal parts of the instrument The power cord must be connected to a properly grounded source for electrical shock protection Measurements and Auto Setup Controls Refer to Figure 2 7 for location of items 42 through 46 CLEAR MEAS MT Clears displayed service menus and cursor measurements functions 2 18 2245A Operators Controls Connectors and indicators mm MEASUREMENTS CLEAR DUNS NS MEAS MT VOLTS TIME TIME 4 ci Figure 2 7 Measurement controls CUR
7. Set the function generator output controls to produce a six division sine wave display at 10 Hz with no de offset Set CH 1 Input COUPLING to AC CHECK display amplitude is 4 2 divisions or more Set VERTICAL MODE to CH 2 CH 1 off Repeat the procedure for CH 2 Disconnect the test equipment from the 22454 2245A Operators 7 25 Performance Check Procedure AAA rest 22 a 23 Vertical ALT and CHOP Modes Set VERTICAL MODE CH 1 CH 2 CH 3 CH 4 On CHOP VERTICAL MODE Off ALT mode CH 1 and CH 2 VOLTS DIV 10 mV CH 3 and CH 4 VOLTS DIV 0 1 V CH 1 and CH 2 input COUPLING DC Horizontal MODE A SEC DIV 0 1 ms TRIGGER MODE AUTO LEVEL Position all traces for two divisions of separation with the CH 1 trace near the top then in order down the graticule area with the CH 4 trace near the bottom Set SEC DIV to 10 ms CHECK that four traces are sweeping across the screen alternately Set CHOP VERTICAL MODE On CHECK that four traces are sweeping across the screen simultane ously BEAM FIND Functlonal Check Push BEAM FIND in and hold CHECK the signal is visible and compressed fully within the graticule area as the horizontal and vertical position controls are rotated through thelr ranges Release the BEAM FIND button Set all Vertical and Horizontal POSITION controls at the 12 o clock po sition 7 26 2245A Operators Performance Check Procedure 24 A and B Trace Separation a
8. 365 MODE Buttons Up and Down Arrows and Indicators Select the operating modes of the A and B trigger systems Pressing the Up Down Arrow buttons selects the operating modes as shown by the TRIGGER MODE lights Selections available for the A Trigger A B SELECT button lit are AUTO LEVEL AUTO NORM TV LINE TV FIELD and SGL SEQ Selections for the B Trigger A B SELECT button not lit are AUTO LEVEL RUNS AFTER NORM TV LINE FROM A SOURCE A Trigger Modes AUTO LEVEL Automatically sets the range of the Trigger LEVEL control to the peak to peak limits of an adequate A Trigger source signal and triggers the sweep Autoleveling is repeated if triggering is lost if the TRIGGER LEVEL control is rotated to either end stop or if AUTO LEVEL TRIGGER MODE is selected again AUTO LEVEL mode is useful for quickly iocating and maintaining an appropriate triggering level NOTE When in AUTO LEVEL or AUTO triggering the sweep free runs to produce a baseline trace when the A trigger source signal amplitude is too low or the frequency is below 10 Hz Switch to NORM triggering if the repetition rate Is too siow for autoleveling AUTO Triggers the same as the NORM Trigger MODE when an ade quate trigger signal is applied However the A sweep free runs to display a baseline trace when there is no trigger signal or the frequency is below 10 Hz The set triggering level changes only when the TRIGGER LEVEL control is adjusted to a ne
9. Performance Check Procedure 3 CH 3 and CH 4 VOLTS DIV Trace Shift a Set VERTICAL MODE to CH 3 CH 2 off b Position trace to the cente horizontai graticule line C Switch CH 3 VOLTS DIV between 0 1 V and 0 5 V d CHECK trace shift does not exceed one division e Set VERTICAL MODE to CH 4 CH 3 off f Position trace to the center horizontal graticule line g Switch CH 4 VOLTS DIV between 0 1 V and 0 5 V n CHECK trace shift does not exceed one division 4 CH 1 and CH 2 VAR VOLTS DIV Trace Shift a Set VERTICAL MODE CH 1 CH 4 off CH 1 VOLTS DIV 2 mV b Position trace to center graticule line C Set CH 1 VAR VOLTS DIV fully CCW counterclockwise d CHECK trace shift does not exceed one division e Set CH 1 VAR VOLTS DiV Detent calibrated VERTICAL MODE CH 2 CH 1 off CH 2 VOLTS DIV 2 mV f Position trace to center graticule line g Set CH 2 VAR VOLTS DIV fully CCW h CHECK trace shift does not exceed one division i Set CH 2 VAR VOLTS DIV to detent calibrated position 7 12 2245A Operators Performance Check Procedure 5 CH 1 and CH 2 Input COUPLING Trace Shift a Position trace to center graticute line b Set CH 2 input COUPLING to DC c CHECK trace shift does not exceed 0 25 division d Set VERTICAL MODE CH 1 CH 2 off CH 1 input COUPLING GND e Position trace to center graticule line f Set CH 1 Input COUPLING to DC g CHECK trace shift does not exceed 0 25 div
10. sweep speed in the ALT MODE set the Horizontal MODE to A adjust the SEC DIV switch to a faster A sweep setting and reset the Horizontal MODE switch to ALT The B sweep speed and the length of the intensified zone are determined by the B SEC DIV switch setting B Selects B sweep horizontal deflection The B sweep speed is de termined by the B SEC DIV switch setting as displayed 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 je OR DELAY con trol The B SEC DIV switch setting and the Delay Time Position set ting are displayed in the crt readout A greater than sign gt is dis played in front of the Delay Time readout if the B Trigger MODE is not RUNS AFTER X Y The signal applied to CH 1 OR X input connector produces the horizontal X Axis deflection Signals applied to any vertical input connector or ADD may be selected to provide the vertical deflection Y Axis The X Y displays are horizontally positioned by the Horizontal POSI TION control and vertically positioned by the associated vertical chan nel POSITION control QT A AND B SEC DIV Switch Selects the horizontal deflection rate sweep speed for both the A sweep and the B sweep in a 1 2 5 sequence Calibrated sweep speeds are obtained wi
11. Connectors BNC nation Ratlo 2X impedance 50 Q Connectors BNC Connectors BNC Signal inter male to connection m nlature probe tip Length 1 in shaft i Adjust TRACE Bit size 3 32 in ROTATION pot Low capacitance Adjust variable insulated capacitors and resistors Bandwidth Z Axis Response 20 MHz adjustment Connectors BNC Signal inter femaie to dual connection BNC male Connectors BNC Signal inter connection triggering checks input Resistance 1 MQ Input Capacitance 22 pF Input Capaci tance adjust ments REV JUN 1989 Example of Test Equipment Tektronix Part Number 012 0057 01 Tektronix Part Number 012 0482 00 Tektronix Part Number 011 0049 01 Tektronix Part Number 011 0059 02 Tektronix Part Number 011 0069 02 _ Tektronix Part Number 013 0084 02 Tektronix Part Number 003 0675 00 TEKTRONIX 2246 Tektronix Part Number 067 0525 02 Tektronix Part Number 103 0030 00 Tektronix Part Number 067 0538 00 2245A Operators Performance Check Procedure Table 7 1 cont tem and Minimum Example of Description Specification Use Test Equipment TV Signal Provide Composite Check TV TEKTRONIX Generator TV Video and Line Trigger circuit 1SG 100 Sync Signals Test Signal Generator Digital Dc Volts Range Power supply TEKTRONIX Multimeter O t
12. Performance Check Procedure c Position the time marker peaks verticaliy to the center horizontal graticule line allows use of the minor division graticule markings as an aid in making the accuracy checks NOTE For the fastest sweep speeds where the time marker peaks are rounded and not well defined greater resolution can be achieved by verticaliy centering the display and using the point where the rising edge of the time marks cross the center horizontal graticule line as a reference d Position the second time marker to the second vertical graticule line e CHECK that the tenth time marker is within 0 16 divisions left or right of the tenth graticule line f CHECK that the spacing of the time markers over any two division interval within the center eight divisions does not deviate from the value measured at the center two division by more than 0 1 division g Repeat the procedure for all other A SEC DIV settings Use SEC DIV and Time Mark Generator settings in the column labeled X1 given in Table 7 3 Settings for Timing Accuracy Checks h Set SEC DIV to 20 ns i Set time mark generator for 20 ns time marks LD Set Horizontal MODE B B INTEN For a viewable display k Repeat the CHECK procedure for all the B SEC DIV settings 2245A Operators 7 39 Performance Check Procedure Table 7 3 Settings for Timing Accuracy Checks SEC DIV Setting Time Mark Setting x xio MAG x10 MAG 20 ns 5 ns 50 ns S ns 0
13. C to 35 C 10 C to 15 C and 35 C to 55 C Variable Range Frequency Response 3 dB bandwidth 10 C to 35 C 5 mV to 5 V div 2 mV 35 C to 55 C AC Coupled Lower 3 dB Point 1X Probe 10X Probe Step Response 5 division step Rise Time 10 C to 35 C 5 mV to 5 V div 2 mV 35 C to 55 C 2 mV div to 5 V div in 1 2 5 sequence A Within 296 Within t296 Increases deflection factor by at least 2 5 1 Dc to 100 MHz at the input BNC and at the probe tip Dc to 90 MHz at the input BNC and at the probe tip Dc to 90 MHz at the input BNC and at the probe tip 10 Hz or less 1 Hz or less 3 5 ns or less calculated 2 3 9 ns or less calculated 2 3 9 ns or less calculated 3 a Performance Requirement not checked in manual 6 2 2245A Operators CHARACTERISTICS Delay Match CH 1 to CH 2 Common Mode Rejection Ratio CMRR Channel Isolation attenuation of deselected channel 2 mV Div to 0 5 V Div Trace Shift as VAR VOLT S DiV is Turned Invert Trace Shift Trace Shift Between VOLTS DIV Switch Positions Trace Shift Between GND and DC input Coupling 10 C to 35 C IS CC 9 5915 Position Range input Characteristics Resistance Capacitance Capacitance Match Between Any Two VOLTS DIV Settings Maximum input Volts Performance Characteristics Table 6 1 cont PERFORMANCE REQUIREMENTS Less than 200 ps difference At least 1
14. Die vom Betreiber zusammengestellte Anlage innerhalb derer dies Ger t eingesetzt wird mu ebenfalls den Voraussetzungen nach Par 2 Ziff 1 der Vfg 1046 1984 genugen NOTICE to the user operator The German Postal Service requires that this equipment when used in a test setup may only be operated if the requirements of Postal Regulation Vfg 1046 1984 Par 2 Sect 1 7 1 are complied with HINWEIS f r den Benutzer Betreiber Dies Gerat darf in Meflaufbauten nur betrieben werden wenn die Voraussetzungen des Par 2 Ziff 1 7 1 der Vfg 1046 1984 eingehalten werden LIST OF ILLUSTRATIONS iii ng cud a E ARR sua M LISTO TABLES naci ne raa MM OPERATORS SAFETY SUMMARY c se ASS Vili SECTION 1 INTRODUCTION PRODUCT OVERVIEW adan ES EX UE Ea EE Er ERR Description U 803 o amp wp ro d we 4 ho ros a a 4a ud standard AccessorleS Licia acide a SN ee abitata SIT 412 tate Fe RO RE aa oe tare ue oe AO ING USO a ain tena Ae Ae Reet alas leo a arden i Line Voltage and Power Cord visible Dr ee SUC AC ala IDSEFUFHORE COONNG rra a Slo aerei Repackaging for shipment ieri RARA Al SECTION 2 CONTROLS CONNECTORS AND INDICATORS Crt Power and Display Vertical II II II 9 4 8 ORO 8 09 o9 8 o3 o o4 4 3 4 EK X 9 V 4 9 9 9 9 9 3 kd AR Trigger 09 o co 4 G 4 4 amp Yo BON 3
15. Set A SEC DIV 1 ms VERTICAL MODE CH 1 others off Horizontal MODE ALT B SEC DIV 0 5 ms A B SELECT B B Trigger MODE RUNS AFTER TRACE SEP Fully CW b Position the CH 1 trace below the center horizontal graticule iine to display the separated B trace c CHECK for at least four divisions of upward trace separation between the B trace and the A trace d Set TRACE SEP fully CCW e Position the CH 1 trace above the center horizontal graticule line to display the separated B trace f CHECK for at least four divisions downward trace separation of the B trace from the A trace 2245A Operators 7 27 Performance Check Procedure TRIGGERING Eguipment Required See Table 7 1 Leveled sine wave generator 50 BNC coaxial cable 2X BNC attenuator Dual input coupier Function generator 10X BNC attenuator 50 BNC termination TV signal generator 1 500 Hz Trigger Sensitivity a Set READOUT Intensity A INTEN For a viewable readout For a viewable trace VERTICAL MODE CH 1 CH 1 and CH 2 input COUPLING DC CH 1 VOLTS DIV 0 1 V SCOPE BW On Horizontal MODE A A SEC DIV 1 ms Horizontai POSITION 12 o clock A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER SOURCE VERT TRIGGER CPL G AC TRIGGER SLOPE positive going TRIGGER HOLDOFF Min FOCUS CLEAR MEAS MT For best defined display Press to remove measurement cursors b Connect function generator FG 502 output to the CH 1 input via
16. Set bottom of the signal to bottom graticuie line 7 14 2245A Operators Performance Check Procedure g CHECK the signal amplitude is between 1 9 and 2 1 divisions h Repeat the procedure for CH 2 8 CH 1 and CH 2 Vertical Deflection Accuracy a Set CH 2 VOLTS DIV to 2 mV b Set calibration generator to Std Ampl output 10 mV c Position the trace two graticule lines below the center horizontal graticule tine d CHECK all positions of the VOLTS DIV settings for correct signal to graticule accuracy using the settings in Table 7 2 Signai to Graticule Accuracy for the checks e Set calibration generator to Std Ampi output 10 mV f Move the test signai to the CH 1 input g Set VERTICAL MODE CH 1 CH 2 off CH 1 VOLTS DIV 2 mV h Same as c above Repeat CHECK procedure for CH 1 2245A Operators 7 15 Performance Check Procedure Table 7 2 Signai to Graticule Accuracy VOLTS DIV Std Ampi Deflection Accy Setting Setting in divisions 2 mV 4 90 to 5 10 5 mV 3 92 to 4 08 10 mV 4 90 to 5 10 20 mV 4 90 to 5 10 50 mV 3 92 to 4 08 0 1 V 4 90 to 5 10 0 2 V 4 90 to 5 10 0 5 V 3 92 to 4 08 tV 4 90 to 5 10 2V 4 90 to 5 10 5V 3 92 to 4 08 10 CH 3 and CH 4 Vertical Deflection Accuracy a Set VERTICAL MODE CH 3 CH 1 off CH 3 VOLTS DIV 0 1 V b Position the trace to the second graticule line down from the center horizontal graticule line C Move the test signal to the CH 3 input d
17. Signal peaks must be lt 10 volts X probe multiplier Nominally midway between peaks of B B LEVEL SOURCE signal Signal peaks must be lt 10 volts X probe multiplier Appendix A O 2 Table A 1 cont AUTO SETUP Control Settings FRONT PANEL CONTROL VERTICAL MODE CH 1 CH 2 and ADD CH 3 and CH 4 CHOP ALT CH 2 INVERT VERTICAL POSITION CH 1 Channel turned on CH 2 Channel turned on CH 3 Channel turned on CH 4 Channel turned on CH 1 and CH 2 VOLTS DIV Channel turned on CH 3 and CH 4 VOLTS DIV Channel turned on A SEC DIV AUTO SETUP ACTION CH 1 and CH 2 if ADD only was selected otherwise only CH 1 CH 2 or both as selected As selected CHOP if A sweep is 0 1 ms div or slower ALT of 50 us div or faster Off Ground level aligned wlth 3rd graticule line from top a Ground level aligned with 5th graticule line from top Ground level aligned with ist graticuie line from top amp Ground level aligned with 7th graticuie line from top a The VERTICAL POSITION controls do not affect the position of the trace until moved through the point corresponding to the trace position set by AUTO SETUP Lowest setting for which all waveform values are within 2 divisions of ground 0 5 V plus probe factor if applicable One speed slower than the fastest speed that displays one complete cycle of the triggering signal within the range 2 ms to 20 ns Dependi
18. Table 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS PROBE ADJUST OUTPUT Overshoot rising and 0 1 or less failing edge Output Voltage on PROBE 0 5 V 2 into 1 MO load ADJUST Jack Repetition Rate kHz 125 FRONT PANEL SETUP MEMORY Battery Life 5 years Battery Type 3 0 V 1200 mAH Type BR 2 3AE2P Lithium amp WARNING To avoid personal nur have battery replaced only by a qualified service person who understands proper handling and disposal procedures for Lithium batteries POWER SOURCE Line Voltage Range 90 Vac to 250 Vac Line Frequency 48 Hz to 445 Hz Line Fuse 2 A 250 V slow blow Maximum Power 100 Watts 155 VA 8 Consumption a Performance Requirement not checked in manual 6 10 2245A Operators Performance Characteristics Table 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS DD e TTT MUT ITE i APTIUS nd ENT cH Display Area Geometry Vertical Horizontal Trace Rotation Range Standard Phosphor Y Axis Orthogonality Nominal Accelerating Voltage CH 2 Signal Out Dynamic Range Befiection Factor 3dB Bandwidth DC Offset Adjusted A GATE Out Output Voltage Output Drive CRT DISPLAY 8 by 10 om t1 2 minor 0 1 div at 8 by 8 cm centered area t1 2 minor 0 1 div at 8 by 10 cm centered area Adequate to align trace with center horizontal graticule fine paia 0 1 division or less over eight vertical divisions
19. and partial divisions occupied by the portion of the display being measured and then multiplying by the VOLTS DIV setting Time measurements using the graticule markings are done in a similar manner Count the number of horizontal graticule divisions and partial divisions occupied by the portion of the waveform being measured and multiply by the SEC DIV setting To improve the accuracy of the estimate position the display to take ad vantage of the 0 2 division minor graticule markings on the center graticule l nes Also position one of the measurement points of the waveform as pre cisely as possible on one of the major graticule marks to be used as a measurement reference point 2245A Operators 3 1 Operators Familiarization MEASUREMENT NAME AND VALUE OR ERROR MESSAGE dB SEC DIV TOR X Y MODE VOLTS DIV CHI COUPLING CH2 VOLTS DIV INPUT COUPLING SYMBOLS AC v DC sz GND Figure 3 1 Readout display locations 3 2 2245A Operators Operators Familiarization 1ST OR LEFT 11TH OR RIGHT VERTICAL VERTICAL GRATICULE LINE GRATICULE LINE RISE AND RENE E n CENTER FALL TIME d HORIZONTAL MEASUREMENT Bee Hehe PERCENTAGE MARKERS CENTER VERTICAL GRATICULE LINE 6558 11 Figure 3 2 Graticule measurement markings Connecting Input Signals Grounding The most reliable signal measurements are made when the 2245A and the unit under test are connected by a common reference ground lead in a
20. d Disconnect the TV signal generator from the 22454 9 Line Trigger Functional Check a Set CH 2 VOLTS DIV 0 1 V without a 10X probe attached CH 2 Input COUPLING DC A SEC DIV 5 ms TRIGGER MODE AUTO LEVEL TRIGGER SOURCE LINE TRIGGER CPLG DC b Connect a 10X probe to the CH 2 input connector c Attach the proba tip to a length of wire at least four inchas long Hold the wire near the middie portion of the Instrument power cord d CHECK that the display can be triggered in both _ positive going and X negative going slopes e Disconnect the test setup 2245A Operators 7 35 Performance Check Procedure Equipment Required See Table 7 1 1 A and B Sweep Length a HORIZONTAL Time mark generator 50 Q BNC termination Set READOUT intensity A INTEN VERTICAL MODE CH 1 and CH 2 input COUPLING CH 1 VOLTS DIV Horizontal MODE A SEC DIV Horizontal POSITION A B SELECT TRIGGER MODE TRIGGEH SOURCE TRIGGER CPLG TRIGGER SLOPE THIGGER HOLDOFF TRIGGER LEVEL CLEAR MEAS MT FOCUS 50 O BNC coaxlal cable For a viewabie readout For a viewable trace CH 1 DC 0 5 V A 2 ms 12 o clock A Trigger AUTO LEVEL VERT AC _f positive golng Min 12 o clock Press to remove measurement cursors For best defined display Connect time mark generator TG 501 to the CH 1 Input via a 50 O BNC coaxial cable and a 50 O BNC termination Set generator for 2 ms time marks 7
21. provide convenient reference points for making rise and fall time measure ments when the signal to be measured is properly set up Use the following steps as a guideline in making rise time measurements t Apply the signal to the CH 1 input connector 2 Set Vertical MODE CH 1 Horizontal MODE A A Trigger SLOPE E u 5 6 2245A Operators 10 Basic Applications Press AUTO SETUP button Set the CH 1 VOLTS DIV and VOLTS DIV VAR controls to provide an exact five division vertical display Use the CH 1 Vertical POSITION control to place the negative amplitude of the signal on the 0 reference line and the positive amplitude on the 100 reference line increase the SEC DIV setting to stretch out the rising edge of the waveform as much as possible to improve the cursor placement accuracy see Figure 5 4 Adjust the Trigger LEVEL control if necessary to get the 10 level on screen NOTE If measuring fail time use negative SLOPE This places the trigger point at the beginning of the sweep so that when the SECIDIV setting is advanced the slope of interest remains within the viewing area Increase the A INTEN contro if necessary to brighten the beginning of the trace and use the Horizontal POSITION control to place the 5096 ievel center of the rising edge of the waveform at the center vertical graticule line Press TIME button to display the time cursors Use the k OR DELAY control to alig
22. 1 OPTION 15 grilli aed CEN tir RUE SS aS NOE HORE e e 8 1 Standard Accessories ooooororonpara oro corras ooo eras 8 1 Optional Accessories lo a A dea 8 2 Instrument Enhancements 0 0 0 00 ccc ee naa art 8 2 Transporation Ads falle aa bse aero he B 2 Cameras ee a ee 8 2 o De ire 8 3 Vionna Hoods 42 cesa O leere 8 3 APPENDIX A AUTO SETUP MIN SETUP Control Settings APPENDIX B FACTORY SETTINGS CHANGE INFORMATION 2245A Operators Figure 1 2 2 1 2 2 2 3 2 4 2 5 2 6 2 7 3 1 3 2 3 3 3 4 3 5 4 1 5 1 5 2 5 3 5 4 5 5 5 6 5 7 6 1 6 2 6 3 vi LIST OF ILLUSTRATIONS Page The 2245A Oscilloscope oo ee teen es ee een eae 1 1 Optional power cords ooocoooorooomcsnorcrcorncoras 1 5 CRT power and display controls 0 2 2 CH 1 and CH 2 vertical controls and connectors 2 4 Vertical connectors and CH 3 and CH 4 controls and indicators sese reiezione 2 6 Horizontal controls and indicators oooooormom 2 8 Trigger controls and indicators 0 2 12 Rear panel connectors and fuse 00 2 18 Measurement controls oooooronommmaccrnanarrnoo 2 19 Readout display locations ooncooorooommonmmrons 3 2 Graticule measurement markings sse nnn 3 3 Service Mani xo RACE TRADE ee 3 9 Configure MGM cadcm ee ooh eed en 3 11 Internal Settings Menu eser an rn 3 12 Probe compensation cuatro reri Rx E
23. 1 and CH 2 VOLTS DIV switches to 0 1 V for the attached 10X probes 2245A Operators 4 5 Operator Checks and Adjustments Set the bottom of the trace of the PROBE ADJUST square wave signal to a convenient horizontal graticule line with the Verticai POSITION control Check for a five division display of the PROBE ADJUST square wave signal Select CH 2 VERTICAL MODE and repeat steps 6 and 7 Disconnect the probes from the instrument Timing Checks The time measurement cursors may be used to check the horizontal deflec tion system 1 Preset instrument controls and obtain a baseline trace and set the A SEC DIV switch to 0 1 ms Vertically center the baseline trace Press the TIME button to select the Time Measurement function for measuring time difference Align the reference cursor to the second vertical graticule fine using the i OR DELAY control both cursors are positioned together Adjust the gt control for a reading of 800 0 us Check that the cursors are eight divisions apart Press the CLEAR MEAS MT button to remove the cursors from the display 4 6 2245A Operators APPLIC ATIO 2245A Operators Dogo o coto Bop eet en tn tan naa me FIERO Ett th dedi Meet Panta Basic Applications introduction The TEKTRONIX 2245A Oscilloscope has a cursor measurement system for making accurate direct readout voltage time and frequency measurements The measurements
24. 1 us 10 ns 0 2 us 20 ns 0 5 us 50 ns i ps 0 1 pus 2 us 0 2 us 5 us 0 5 ps 10 us 1 us 20 us 2 us 50 us 5 us 0 1 ms 10 us 0 2 ms 20 us 0 5 ms 50 us 1 ms 0 1 ms 2 ms 0 2 ms 5 ms 0 5 ms A Sweep only 7 40 2245A Operators Performance Check Procedure 6 A and B Magnifled Timing Accuracy and Linearity b Set time mark generator for 20 ns time marks Set Horizontal MODE A A SEC DIV 20 ns Horizontal MODE B B SEC DIV 20 ns X10 MAG On for 2 ns div sweep speed CH 1 VOLTS DIV 0 5V use 0 2 V for the 5 ns time markers If necessary Set the Horizontal POSITION control to 12 o clock and then align the rising edge of the nearest time marker to the second vertical graticule line center the display vertical NOTE For the fastest sweep speeds where the time marker peaks are rounded and not well defined greater resolution can be achieved by vertically centering the display and using the point where the rising edge of the time marks cross the center horizontal graticule line as a reference CHECK that the rising edge of the fourth displayed time marker crosses the center horizontal graticule line at between 8 27 divisions and 8 73 division from the left most graticule line CHECK that the spacing of the time markers over any 2 5 division interval within the center eight divisions does not deviate from the value measured at the center 2 5 divisions by more than 0 12 division Use the fifth vertical gr
25. 2245A to a rackmounted instrument Installation instructions for rackmounting are provided in the documentation supplied with the rackmounting kit and the 1R Option Other Available Options Option 02 Front Panel Cover and Accessory Pouch Option 1C C 5C Option 02 Camera Option 1K K212 Portable Instrument Cart Option 17 P6408 Logic Probe included Option 22 Two P6109 Option 1 10X voltage probes Option 23 Two P6062B 1X 10X voltage probes 6 feet Standard Accessories The following standard accessories are provided with each instrument Part Number 2 Probes 10X 1 5 m with accessories P6109 or equivalent i Power cord Option A0 A5 As orciered 1 Power cord clamp 343 1213 00 1 Operators manual 070 6558 01 1 Reference guide 070 6718 01 1 CRT implosion shieid blue plastic installed 337 2775 00 1 Fuse 2 A 250 V slow blow 159 0023 00 1 Accessory pouch ziploc 004 0 130 00 Optional Accessories The following optional accessories are recommended for use with the 2245A Oscilloscope instrument Enhancements Part Number Protective front panel cover 200 3232 00 Attaching accessories pouch 016 0857 00 Protective waterproof vinyl cover 016 0848 00 Clear implosion shield 337 2775 01 Rackmounting kit 2240F1R DC Inverter power supply 1105 2245A Service manual 070 6557 00 Transportation Aids Carrying strap 346 0199 00 Portable instrument cart K212 Cameras Low cost scope camera C5 Option 02 Motorized camera C7 Opt
26. 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 essential 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 connections to the product input or output terminals A protective ground connection by way of the grounding con ductor in the power cord is essential for safe operation Danger Arising From Loss of Ground Upon loss of the protective ground connection all accessible conductive parts inciuding knobs and controls that may appear to be insulating can render an electric shock Use the Proper Power Cord Use oniy the power cord and connector specified for your product The power cord must be in good condition Head Section 1 for power cord and connector information Use the Proper Fuse To avoid fire hazard use only a fuse of the correct type voltage rating and current rating as specified on the back of your product and in Table 6 1 Do Not Operate in an Explosive Atmosphere To avoid explosion do not operate th s product in an explosive atmosphere 2245A Operators IX Do Not Remove Covers or Panels To avoid persona injury do not remove the product covers or panels Do not operate the product without the covers and panels prop
27. Center the rear of the pouch plate and insert the rear edge ofthe plate in the space between the cabinet top and the rear panel trim see part A of illustration 3 Move the pouch sideways as necessary to line up the key slots in the pouch plate with the keys on the rear panel the plate will be centered when aligned and push the plate all the way in see part B of illustration 4 Grasp the pouch plate assembly with both hands near the front of the assembly NOTE in the next step use only enough force to clear the front panel trim with the plate front edge Excessive force will cause a per manent bow in the plate 5 Push back on the plate and press down with the heels of your hands to bow the plate enough to slide the front of the plate into the space between the cabinet top and the front panel trim see part C of illustration 6 Move the front of the pouch as needed to line up the key slots in the plate with the keys on the front panel 7 Release the pressure on the plate to allow it to return to its nor mai flat shape Product _2245A OPERATORS DESCRIPTION ALIGNMENT KEYS UNDER TRIM C BOW THE PLATE AND SLIDE IT INTO THE FRONT TRIM GAP Date _5 8 89 Change Reference _C1 0589 i MANUAL CHANGE INFORMATION Date _8 28 89 Change Reference __C2 0889 Tektronix COMMIT TEC TE EMCPLLENCE Product 22454 OPERATORS Manual Part Number _070 6558 01 DESCRIPTION
28. Controls Connectors and Indicators Vertical Refer to Figure 2 2 for location of items 10 through 17 CH 1 and CH 2 POSITION Controls Adjust vertical position of the Channei 1 and Channel 2 waveform dispiays 11 MODE Buttons Select the vertical channels for display CH 1 ADD channels 1 and 2 CH 2 CH 3 and CH 4 The CHOP ALT MODE button selects method for switching input channels on the display chopped or aiternating 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 se lected 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 channel is turned on CHOP ALT In the CHOP mode the display chops between selected input channels at a rate of about 625 kHz In the ALT mode the se lected channels are displayed in sequence alternating at the end of each sweep ADD Displays the algebraic sum of the Channel 1 and Channel 2 input signals The ADD display is in addition to any other selected channel displays In the ADD mode a plus sign is displayed between the Channel 1 and Channel 2 VOLTS DIV readouts NOTE in ADD mode when AUTO LEVEL TRIGGER MODE or CHOP VERTICAL MODE is selected the algebraic sum of Channel 1 and Channel 2 display provides the internal si
29. Enable Frequency AUTO and The sweep will free run if trigger source AUTO LEVEL frequency is less than 10 Hz in AUTO LEVEL if the trigger source frequency is 25 Hz the range of the Trigger LEVEL contro may be reduced 2245A Operators 6 7 Performance Characteristics AAA As e e a nmm CHARACTERISTICS LEVEL Control Range TRIGGER LEVEL READOUT Accuracy HOLDOFF Controi Range Table 6 1 cont PERFORMANCE REQUIREMENTS 10 divisions referred to the appropriate vertical input This range is sufficient to allow triggering at any point on a displayed waveform for ail modes except ADD In ADD the com bined range of the two position controls exceeds the trigger level range making it possible though unlikely to pull a signal on screen for display but fall to trigger on it due to insufficient trigger level range t 0 396 of reading 10 of one vertical division Increases A Sweep holdoff time by at least a factor of 10 FUNCTIONS WITH DIGITAL READOUT CURSOR FUNCTIONS TIME manually positioned cursors Accuracy 1 TIME manually positioned cursors Accuracy CURSOR VOLTS man ually positioned cursors Accuracy 6 8 Specifications for functions with digital readout are valid only when the ambient temperature is within 110 C of the temperature at the time of the last SELF CAL For maximum performance a recent SELF CAL is recommended 0 5 of reading 2 of the SEC DIV setti
30. INTEN Control Adjusts the brightness of the A trace B INTEN Control Adjusts the brightness of the B Delayed sweep trace and the intensified zone on the A trace FOCUS Control Adjusts the focus of the ert 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 readout display includes all alphanumerics and cursors SCALE ILLUM Control Adjusts the illumination level of the graticule NOTE Life of the graticule illumination lamps can be increased by setting the SCALE ILLUM control for the minimum intensity needed for viewing and turning off scale illumination when not needed SEAM FIND Button Locates off screen and overscanned displays when the button is held in Limits the vertical and horizontal deflection within the display area and unblanks the crt 2245A Operators 2 1 Controls Connectors and Indicators tronix 2245A 100 MHz OSCILLOSCOPE SEAM FED L SCALE READOUT ELUM 6558 03 Figure 2 1 Crt power and display controls CRT Displays waveforms and readouts in an 80 mm vertical by 100 mm horizontal graticule area Internal graticule lines provide parallax free viewing of trace and graticule lines 0 10 90 and 100 points marked at the left edge of the graticule aid in making rise and fali time measurements 2245A Operators
31. Increase the generator frequency to 25 MHz r CHECK Dispiay amplitude is 4 24 divisions or greater S Disconnect the test setup 2 A GATE Output a Set SEC DIV 0 1 ms TRIGGER MODE Auto HOLDOFF Minimum COW b Connect a test oscilloscope to the A GATE OUT Connector from the rear pane via 50 Q BNC cable CHECK Test oscilioscope displays a signal with a high level between 2 V and 5 25 V and a low level between 0 V and 0 7 V d CHECK Duration of the high level is greater than or equal to 0 2 ms e Set HOLDOFF Contro to maximum CW f CHECK Duration of the high level is greater than or equal to 2 ms g Disconnect the test setup 2245A Operators 7 51 sre Dn RAS un 2245A Operators qe sen Merritt nt Options and Accessories introduction This section lists the instrument options and accessories that were available at the time this manual was published To obtain additional information about these and other options and accessories refer to a current Tektronix Product Catalog or contact your local Tektronix Field Office or representa tive Options Ai A5 International Power Cords Instruments are shipped with the detachable power cord option as ordered by the customer Descriptive information about the international power cord options is provided in Section 2 Preparation for Use Order power cords only by option number and description The optional power cords available for the
32. No adjustment 16 KV A OPTION 15 7 divisions 10 mV div into 50 1096 20 mV div into i MO 10 DC to 25 MHz lt 0 5 div measured at 2 mV DIV 3 5 V to 5 25 V positive going pulse starting at O V to 0 7 V Will supply 4 mA during HI state will sink 20 mA during LO state not tested in Per formance Check a Performance Requirement not checked in manual 2245A Operators 6 11 Performance Characteristics 8 amp z x a a Q c on 9 8 10 kHz 50 kHz 100kHz 500kHz 1 MHz 100 MHz FREQUENCY 02020 Figure 6 1 Maximum input nase vs frequency derating curve for the CH 1 CH 2 CH 3 CH 4 input connectors 6 12 2245A Operators Performance Characteristics Table 6 2 Environmenta Characteristics CHARACTERISTICS DESCRIPTION STANDARD INSTRUMENT Environmental Requirements Temperature Operating Non operating Altitude Operating Non Operating Humidity Operating and Non operating Radiated and conducted Emission required per VDE 0871 instrument meets or exceeds the environmental requirements of MiL T 28800D for Type lil Class 3 Style D equipment 4 10 C to 455 C 14 F to 4131 F 51 C to 71 C 60 F to 4160 F Tested to MIL T 28800D paragraphs 4 5 5 1 3 and 4 5 5 1 4 except in 4 5 5 1 3 steps 4 and 5 10 C operating test are performed ahead of step 2 51 C non operating test Equipment shali remai
33. Signal peaks must be lt 10 volts X probe multiplier Nominally midway between peaks of B SOURCE signal Signal peaks must be lt 10 volts X probe multiplier DC if COUPLING set to GND or DC otherwise AC CH 1 and CH 2 if ADD only was selected otherwise oniy CH 1 or CH 2 or both as solected Lowest value for which all waveform val ues are within 2 divisions of ground P if Horizontal MODE is X Y CH 1 VOLTS DIV is stepped down one addi tional setting One speed slower than the fastest speed that displays one complete cycle of the triggering signal within the range 2 ms to 20 ns Depending on input signal characteristics f more than one complete cycle can be displayed at 20 ns the A sweep may be set to either 50 ns or 20 ns 5ms if TV FIELD selected 10 us if TV LINE selected 20 ns if A SEC DIV was set to 20 ns or 50 ns by MIN SETUP otherwise two speeds faster than A SEC DIV 10 us if TV LINE selected Measurement Reinitialized a MIN SETUP only sets those controls fisted All other front pane controis remain as set bur the Haer Appendix B Table 8 1 Factory Settings Controls Settings VERTICAL MODE CH 1 AND CH 2 CH 1 CH 2 INPUT COUPLING DC CH 1 2 3 4 VOLTS DIV 0 1 V CH 2 INVERT OFF SCOPEBW OFF HORIZONTAL MODE A X10 MAG OFF A SEC DIV 0 1 ms B SEC DIV inus A B SLOPE a A B SELECT A A TRIGGER MODE AUTO LEVEL 8 TRIGGER MODE RUNS AFTER A and B TRIGGER SOURCE
34. Trigger Functional Check isse nnn nn 7 35 HORIZONTAL 2 52 at RA ee eS 7 36 A and B Sweep Length r 7 36 Horizontal POSITION Range 7 37 VAR SEC DIV Range oooooocooororrnroanrcn eee rat 7 38 Magnifier Registration o 7 38 A and B Timing Accuracy and Linearity o oooooommms o 7 38 A and B Magnified Timing Accuracy and Linearity 7 41 Delay Time Jitter 42 oes rack ee X Eo vo OR eR ALIOS gc Red 7 42 Delay Time Accuracy ooooommccncnrrcr he rrr 7 43 Delay Time Position Range see n nmn 7 44 X Axls Gali Accuracy ili a a 7 44 X Y Phase Difference o onooononororononsasraon s 7 45 X Axls Bandwidth oocoooonomonoconpsncaroronacsacoon o 7 45 MEASUREMENT CURSORS 00 eee cece tere hh mer 7 46 k SEC di and je 1 SEC Cursor Accuracy n 7 46 te VOLTS 4 Cursor Accuracy 0 ccc ee hh e mra 7 47 EXTERNAL Z AXIS PROBE ADJUST AND AUTO SETUP FUNCTIONS 1 ee ahhh tht tn 7 48 Check External Z Axis Input coo eat mrt 7 48 PROBE ADJUST Output i u raros ila 7 49 AUTO SETUP Functional Check oo ooororcnnronponses 7 49 OPTION Ve Ze SARA EI s dog dp ai og Ue Ded 7 50 Signal Output ii Cales eR EL GC EORR EO o d de oa en em aes 7 50 A GATE OUUTE io A REOR KK So E HERR OR 7 51 iv 2245A Operators SECTION B OPTIONS AND ACCESSORIES ligas To AAA REPRE EU VO SPO PRE qe 8 1 Options A1 A5 International Power Cords 8
35. a 50 Q BNC coaxial cable and a 50 Q BNC termination c Set function generator FG 502 output to produce a 7 0 division sine wave display at 500 Hz d Adda 10X and a 2X BNC attenuator before the 50 DL BNC termination for a 0 35 division display 7 28 2245A Operators Performance Check Procedure NOTE The TRIGGER LEVEL control may be used to obtain a stable dis play e CHECK that the display is stably triggered with DC HF REJ and AC Trigger CPLG and that the display will not trigger on NOISE REJ or LF REJ Trigger CPLG f Set Horizontal MODE 5 TRIGGER CPLG DC A B SELECT B Trigger B TRIGGER MODE NORM B TRIGGER SOURCE VERT B TRIGGER SLOPE positive going B SEC DIV 0 5 ms DELAY Time 0 000 minimum delay time B INTEN For viewable display NOTE lt may be necessary to adjust the TRIGGER LEVEL control to ob tain a display g CHECK that using the Trigger LEVEL control the display can be stably triggered in DC HF REJ and AC Trigger CPLG and that the display cannot be triggered in NOISE REJ or LF REJ Trigger CPLG h Disconnect the test setup from the CH 1 input 2 500 kHz Trigger Sensitivity a Set SCOPE BW Off Horlzontal MODE A A B SELECT A Trigger A SEC DIV 2 us b Connect leveled sine wave generator SG 503 output to the CH 1 in put via a 50 BNC coaxial cable and a 50 2 BNC termination 2245A Operators 7 29 Performance Check Procedure C Set leveled sine wave generator output to pro
36. button 5 Set the CH 1 VOLTS DIV setting to 0 1 V 10 mV with probe discon nected and vertically 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 Mode button to remove the CH 1 trace from the display 8 Set the CH 2 VOLTS DIV setting to 0 1 V 10 mV with probe discon nected and vertically center the PROBE ADJUST square wave signal 9 Repeat Step 6 for the second probe on the CH 2 BNC input connector NOTE Refer to the instruction manual supplied with the probe for more detailed information about the probes and adjustment procedure 4 4 2245A Operators Operator Checks and Adjustments CORRECT FLAT A UNDER COMPENSATED ROLLOFF 6558 15 Figure 4 1 Probe compensation Vertical Deflection Check The PROBE ADJUST square wave signal may be used to check the Channel 1 and Channel 2 vertical deflection system in the following procedure 1 Connect the two 10X probes supplied to the CH 1 and CH 2 input con nectors Connect both probe hook tips to the PROBE ADJUST connector Set VERTICAL MODE CH 1 Horizontal MODE A Press AUTO SETUP button Set CH
37. d RR 4 5 Voltage difference measurement using cursors o 5 2 Pulse period measurement ee nnn nnn 5 5 Frequency measurement o 5 6 Rise time measurement era hh nn 5 8 Phase difference Measurement oooococonoormasaros 5 10 Time difference between two delays een 5 13 Eliminating common mode signals 5 16 Maximum input voltage vs frequency derating curve for the CH 1 CH 2 CH 3 CH 4 input connectors 6 12 Dimensional drawing standard cabinet 6 18 Dimensional drawing rackmount cabinet 2240F1R 6 19 2245A Operators Table 2 1 3 1 6 1 6 3 7 1 7 2 7 4 A 1 Az B 1 Page VERT Inager SOURCE unse rta 2 16 Behavior for Horizontal MODE Changes noo 3 7 Electrical Charaoteristi6s iia idas 6 2 Environmental Characteristics llle ee nnn 6 13 Mechanical Characteristics lean 6 15 test Equipment Hequirad ocio ek EROR RR REOR au 7 3 Signal to Graticule Accuracy LL 7 16 Settings for Timing Accuracy Checks ooo 7 40 Delay Time ACOUIACY are a 7 43 AUTO SETUP Control SOLUS uocis ar A 1 MIN SETUP Control Settings cece ee een cence A 4 FECIONASGHINOS cana ad B 1 2245A Operators vii OPERATORS SAFETY SUMMARY The safety Information in this summary Is for operating personnel Warn ings and cautions will also be found throughout the manual where they apply Terms in
38. 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 self cal routine may run to set the voltage and timing measurement constants The power on self cal runs only if the stored constants have been lost possibly due to a dead memory back up battery The following warning message will be displayed for 5 sec onds WARNING PROBABLE BATTERY FAILURE TURN OFF AND ON TO VERIFY If the message reappears after having turned the power off and on have the battery checked and or replaced by a qualifled service per son The instrument can stili be used for accurate measurements by run ning 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 left and right VERTICAL MODE buttons CH 1 and CHOP ALT Press the ADD button down arrow to underline SELF CAL MEASUREMENTS Press the CH 2 button RUN to start the routine then CH 4 QUIT or CLEAR MEAS MT button to return to the normal oscilloscope mode 1 6 2245A Operators Introduction Repackaging for Shipment Save the original shipping carton and packing material in case it is ever necessary to reship the instrument by a commercial transport carrier if the ori
39. that the bottom of the waveform Is at least one division above the center graticule line Set CH 3 POSITION fully CCW CHECK that the top of the waveform is at least one division beiow the center graticule line Set CH 3 POSITION 12 o clock VERTICAL MODE CH 4 CH 3 off Repeat the procedure for CH 4 Set CH 4 POSITION to 12 o clock Disconnect the test setup from the 22454 CH 1 to CH 2 Signal Delay Match Set VERTICAL MODE CH 1 and CH 2 CH 4 off CH 1 and CH 2 input COUPLING DC CH 1 and CH 2 VOLTS DIV 0 1V SEC DIV 20 ns TRIGGER SOURCE CH 3 Superimpose the CH 1 and CH 2 traces at the 10096 graticule marking 2245A Operators 19 Performance Check Procedure 14 Connect calibration generator PG 506 fast rise rising edge signal to the CH 1 and CH 2 inputs via a 50 precision BNC coaxial cable a 50 f BNC termination and a BNC dual input coupler Connect calibration generator trig out signal to the CH 3 input via a 50 Q BNC coaxial cable and a 50 Q BNC termination Set the calibration generator to Fast Rise and adjust Pulse Amplitude for five divisions of signal amplitude at 1 MHz Position the rising edges of the superimposed waveforms horizontaily to the center vertical graticuie line NOTE it may be necessary to readjust the trigger level to display the rising edge signal in the Delay Match steps This can be done by pressing the upper Trigger MODE button to cause the trigger level to be aut
40. two intensi 2245A Operators 2 19 Controls Connectors and Indicators fled zones the delta time difference between the left and right cur sors or edges of the B display is displayed in seconds in the top line of the crt graticule NOTE Measurement channels for time measurements modes in ALT or B Horizontal mode are set to the lowest number dis played channel for the delay time and the next lowest num ber displayed channel for the delta delay time if more than one channel is displayed Both are set to the same channel when only one is displayed ADD is considered the highest numbered channel 46 Auro SETUP Button Automatically sets up the front panei con trols to produce a usable crt display of the input signals Setups are based on the characteristics of the applied signals The voltage and frequency characteristics of the input signal must be within the limits of the 2245A specifications Auto setup action for each front panel control is shown in Appendix A NOTE MIN SETUP as described below is only available on instru ments Serial Numbered BO20100 or above MIN SETUP Pushing and holding the Auto Setup button uniti instru ment operation returns enters the MIN SETUP function This sets up the front panel controls as the Auto Setup does but leaves many of the controis unchanged from what the user has previously set MIN SETUP setup action for each front panel control is shown in Appendix A 2 20 2245A Operators
41. value readout of a CURSOR VOLTS measurement 2245A Operators 2 5 Controls Connectors and Indicators AAA AAA IA DC Couples de and all 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 se lected a DC symbol is displayed to the right of the associated VOLTS DIV readout Input resistance is 1 MO to ground Refer to Figure 2 3 for location of items 18 through 23 CH 1 OR X and CH 2 Input Connectors Connect signals to the inputs of Channel 1 and Channel 2 vertical attenuators Input connectors are BNC type with an outer contact ring for recog nizing attenuation factors of coded attenuator probes A signal con nected to the CH 1 OR X input connector produces the horizontal de flection X Axis in the X Y horizontal mode Any of the vertical signal channels or ADD can provide vertical deflection Y Axis for an X Y display PROBE ADJUST Connector Outputs a 0 5 V square wave signai at about 1 kHz into a 1 MO load for compensating voltage probes and checking the vertical deflection accuracy COUPLING j m 1 BEAM FIND Bac Bor IZOMB i GND 89TH OFF PROBE MOST CH Ton Ed n Wir 1Mf120pf 5 ADOV p 6558 05 Figure 2 3 Vertical connectors and CH 3 and CH 4 controls and indicators 2 6 2245A Operators Controls Connectors and indicators Auxiliary Ground Jack Provides an auxillary chassis gr
42. 0 1 at 50 MHz for signals of eight divisions or less with VOLTS DIV VAR adjusted for best CMRR at 50 KHz 100 MHz 34 dB or more 50 dB or more Channel isolation tested with eight division input signal 1 division or less 1 division or less 0 2 division or less Less than 0 5 mv Less than 2 mv At least 111 divisions from graticule center 1MO 1 2 20 pF 1 pF 0 5 pF 400 V dc peak ac 800 V p p at 10 kHz orless See Figure 6 1 a Performance Requirement not checked in manual 2245A Operators Performance Characteristics Table 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS VERTICAL DEFLECTION SYSTEM CH 3 AND CH 4 Defiection Factor Range Accuracy 15 to 35 C 10 C to 55 C Frequency Response 3 dB bandwidth 10 C to 36 C 35 C to 55 C Step Response 5 division step Rise Time 10 0 to 35 C do to 55 C Delay Match CH 3 to CH 4 Trace Shift Between VOLTS DIV Settings Position Range Channel isolation attenuation of deselected channel Input Characteristics Resistance Capacitance Maximum input Volts 0 1 V per division and 0 5 V per division Within 12 Within 13 De to 100 MHz at the input BNC and at the probe tip De to 90 MHz at the input BNC and at the probe tip 4 3 5 ns or less 3 9 ns or less Less than 200 ps difference 1 division or iess At least 11 divisions from grat
43. 2245A are as follows Standard North American 120 V 60 Hz 74 in Option A1 Universal Euro 220 V 50 Hz 2 5 m Option A2 UK 240 V 50 Hz 2 5 m Option A3 Australian 240 V 50 Hz 2 5 m Option A4 North American 220 V 50 Hz 2 5 m Option AS Switzerland 220 V 50 Hz 2 5 m Option 15 The 2245A Option 15 oscilloscope provides two additional output signals from the rear of the instrument a Channel 2 output signal and an A GATE output signal The following paragraphs give a more detailed description of both of these outputs Specifications and Performance Checks are inte grated into the appropriate sections of this manual CH 2 Signal Output Connector located on the rear panel provides an out put signal that ls a normalized representation of the Channel 2 input signal The output amplitude Into a 1 M 2 load is approximately 20 mV per division of input signal Into a 50 load the output amplitude is approximately 10 mV per division of input signal A GATE Output Connector located on the rear panel provides a TTL and CMOS compatible positive going gate signal that is HI during the A Sweep and LO when the A Sweep is not running Options and Accessories Option 1R Rackmounted Instrument When the 2245A Portable Oscilloscope is ordered with Option 1R it is shipped in a configuration that permits easy installation into a 19 inch wide equipment rack Also an optional rackmounting kit may be ordered to convert the standard
44. 23 20 Channel bolatan AER HUE ROREM CUN aos 7 24 21 AC Coupled Lower 3 dB Point o lt 7 25 22 Vertical ALT and CHOP Mode eee 7 26 23 BEAM FIND Functional Check ooooomoo oo 7 26 24 A and B Trace Separation 665 6 iii AAA 7 27 TRIGGERING Ty 500 He Trigger Sensitivity 34324 EX WERE a RE Ew 7 28 2 900 KHZ Trigger Sensitivity celebra pre 7 29 3 25 MHz Trigger Sensitivity NE 7 30 4 150 MHz Trigger Sensitivity ooommooonooorooo 7 31 5 Single Sweep Mode a ARENAS AS 7 32 6 Trigger LEVEL Control Range ii u 7 33 7 TV Field Trigger Sensitivity 0 7 34 Di EV Gne THgger Sensitivity a oed Vx Cb ei aa 34 9 Line Trigger Functional Check iiu RR iaa 7 35 7 6 2245A Operators Performance Check Procedure HORIZONTAL i A and B Sweep Length reed 7 36 2 Horizontal POSITION Range 0 0 ce eee eee 7 37 d VAR SEC DIY Range i xoc en ee ra 7 38 4 Magnifier Registration n mmm mmn 7 38 5 A and B Timing Accuracy and Linearity 7 38 6 A and B Magnified Timing Accuracy and Linearity 7 41 T Delay a 4 234 463 el ARCET RC pecado e Rs 7 42 8 Delay The AGcuraoy ies a d er 7 43 9 Delay Time Position Range o oooooooonoommerr oro 7 44 10 X Axis Gain ACCUPACY oc ccc ah hh ato 7 44 th AY Phase Differenee iio AA ERE e 7 45 12 AER SOI cala sarah 7 45 MEASUREMENT CURSORS 1 k SEC gt and le 1 SEC gt Cursor Accuracy
45. 36 2245A Operators Performance Check Procedure d CHECK sweep length of the A trace ls greater than 10 divisions e Set Horizontai MODE B B SEC DIV ims A B SELECT B Trigger TRIGGER MODE RUNS AFTER l OR DELAY Control Fully CCW to the lowest DELAY readout value B INTEN For a visible display f CHECK the Delay Time readout is 0 000 ms and the B Sweep length is greater than 10 divisions 2 Horizontal POSITION Range a Set Horizontal MODE A Horlzontal POSITION Fully CW b CHECK that the start of trace positions past the center vertical graticuie line c Set Horizontal POSITION fully CCW d CHECK that the 11th time marker Is positioned to the left of the cen ter vertical graticule line 2245A Operators 7 37 Performance Check Procedure ninni TTT a UP aa SPIEL UTI A Prt TET Tt nn 3 VAR SEC DIV Range a Set SEC DIV 1 ms SEC DIV VAR Fuly CCW Horizontal POSITION 12 o clock b Set time mark generator for ms time marks c CHECK the time mark spacing is equal to or less than two divisions d Set SEC DIV VAR fully CW calibrated detent A Magnifier Registration a Set X10 MAG on b Position rising edge of a time marker to the center vertical graticule line C Set X10 MAG off d CHECK for less than 0 5 division horizontal trace shift 5 A and B Timing Accuracy and Linearity a Set A SEC DIV to 20 ns b Set time mark generator for 20 ns time marks 7 38 2245A Operators
46. 9 9 divisions to the right of setting of DELAY control but maximum value does not exceed end of the A Sweep a Performance Requirement not checked in manual 6 6 2245A Operators Performance Characteristics Table 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS A AND B TRIGGER Sensitivity CH 1 through CH 4 AUTO LEVEL NORM AND SINGLE SEQUENCE Trigger sensitivity is defined as the minimum peak to peak sine wave trigger signal amplitude required to show the test signal with horizontal jitter of less than 3 0 of one period p p viewed over two seconds with Trigger LEVEL control set at mid COUPLING level but not at control extremes DC 0 35 division from dc to 25 MHz Increasing to 1 0 division at 150 MHz 100 MHz in AUTO LEVEL NOISE REJECT 1 4 division from dc to 25 MHz increasing to 2 2 division at 100 MHz 0 5 division or iess will not trigger HF REJECT 0 35 division from dc to 50 kHz attenuates signals above upper 3 dB cutoff frequency of 70 kHz LF REJECT 0 35 division from 100 kHz to 25 MHz increasing to 1 0 division at 150 MHz 100 MHz in AUTO LEVEL attenuates signals below the lower 3 dB cutoff frequency of 50 kHz AC 0 35 division from 50 Hz to 25 MHz increasing to 1 0 division at 150 MHz 100 MHz in AUTO LEVEL attenuates signals below the lower 3 dB cutoff frequency of 20 Hz TV LINE TV FIELD 0 5 divislon of composite sync will achieve a stabie display Free Run
47. AL SETTINGS MENU see Figure 3 5 consists of MAKE rAC TORY SETTINGS and ADJUST VERTICAL OUTPUT MAKE FACTORY SETTINGS can be performed by the operator ADJUST VERTICAL OUT PUT Is for use by servicing personnel To return to SERVICE MENU set the up arrow key to underline INTERNAL SETTINGS MENU and press the but ton again to display the SERVICE MENU To return to the oscilloscope mode select QUIT from the INTERNAL SETTINGS MENU or SERVICE MENU or press the CLEAR MEAS MT button MAKE FACTORY SETTINGS 1 MENU ADJUST VERTICAL OUTPUT yo 6558 14 Figure 3 5 Internal Settings Menu MAKE FACTORY SETTINGS Sets the front panel controls and menu con figurations as described in Appendix B 3 12 2245A Operators 2245A Operators Operator Checks and Adjustments Introduction The checks and adjustments in this section are for the operator and involve using only controis and adjustments on the outside of the instrument In ternal adjustments must be made by a qualified service person Before operating the instrument for the first time and before connecting the power refer to Section 1 Preparation for Use to prepare the instrument for the initial startup Verify that the POWER switch is OFF out position Plug the power cord into a power source outlet that supplies a voltage within the operating range of the Instrument s power supply NOTE If you notice an improper indication or instrument mal function durin
48. Adjustment iL 4 3 Probe Low Frequency Compensation 0 00 cee nnm nnn 4 3 Vertical Deflection Check Ji day I ER AREE EA a ARAS 4 5 Tining Check uas we OCA EXE ACCRUE e QUOD e Rc VS EAS 4 6 SECTION 5 BASIC APPLICATIONS intreducetiofii oi sU senders 5 1 Voltage Measurement Cursors eee ehh rh hh nr 5 1 Voltage DITerenos ciali iii A AO AAA 5 1 if 2245A Operators Time Measurement Cursors ooo ivrea 5 3 Ime DIffererib ood ee ern 5 3 Ferd Measurement iii ee og A 5 4 Frequency Measurement cdr RAS OX eee 5 5 Rise Time Measurements i rr RARE EE sh 068 ERO Regin 5 6 Phase Measurements cae xa eoe BY dd b Ox ta 5 8 Time Delay Measurement i 5 11 B a UR AS addon 5 14 SECTION 7 PERFORMANCE CHECK PROCEDURE INTRODUCTION n os ack aee d wa AES RE EUR Ue S ROC ACA DIN 7 1 Test Equipment BeQuiFed 2 40 rin 7 1 Performance Check interval 5 cs scissa i on 7 1 FTODAFB O A ad sr Tc E EN be ebd 7 1 INDEX TO PERFORMANCE CHECK PROCEDURE sss 7 6 DISPLAY saw ea ela 7 8 TRAGE ROTATION 423522222 PEE Dea Eg lei 7 8 Geometri ee oie oi e Obat dere nid art VE deir E age 7 9 VERBTIEAL Acilia ATTRITO RETTE 7 10 Input COUPLING Functional Check vii 7 10 CH 1 and CH 2 VOLTS DIV Trace Shift 000 7 11 CH 3 and CH 4 VOLTS DIV Trace Shift 0 000 ca ee 7 12 CH 1 and CH 2 VAR VOLTS DIV Trace Shift on nn nennen 7 12 CH 1 and CH 2 Input COUPLING Trace Shift
49. CH 1 A and B TRIGGER COUPLING DC TRISGER HOLDOFF As selected MEASUREMENTS OFF CONFIGURE Selections KEEP MENU ON WHEN MEAS MT NO SELECTED PRESET TV TRIG SLOPE FOR SYNC YES A INTEN B INTEN READOUT As selected a DQHIQ TU PAZ TRIN ANDE near avallattiia an inctrismanto Sara Ah unsbhuarar Yb cescomaninionete Fur Aparenmazenz sy mente meda de ven det iii MANUAL CHANGE INFORMATION At Tektronix we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested Sometimes due to printing and shipping requirements we can t get these changes immediately into printed manuals Hence your manual may contain new change information on following pages A single change may affect several sections Since the change information sheets are carried in the manual until all changes are permanently entered some duplication may occur If no such change pages appear following this page your manual is Correct as printed Date 5 8 89 Change Reference __C1 0589 Product _2245A OPERATORS Manual Part Number _070 6558 01 DESCRIPTION o Product Group 46 E INSTALLING THE ACCESSORY POUCH REFER TO THE ILLUSTRATION ON THE FOLLOWING PAGE WHILE PERFORMING THIS PROCEDURE 1 Place the oscilloscope on a table or work bench with the rear against a firm support or wall and the front facing you 2
50. CK that the leading edges of the two waveforms have 0 2 horizontal division deparation at the center graticule line excluding trace width Date 11 08 89 Change Reference C3 1189 Manual Part Number _070 6558 01 Produot Group 46 a tte tt AA e tt nte N H M Mosen mmeeeeetets tmm et ttem nt en ee Fes enmense ce e e Tektronix MANUAL CHANGE INFORMATION COMMITTED TO ERCELLENDE Product _2245A OPERATORS Manual Part Number 070 6558 01 i EFFECTIVE ALL SERIAL NUMBERS Page 6 5 VERTICAL DEFLECTION SYSTEM Replace Delay Match with the following Delay Match CH 1 or CH 2 400 ps difference to CH 3 OR CH 4 Page 7 21 Step 14 CH 1 to CH 4 Signal Delay Match d CHECK that the leading edges of the two waveforms have S 0 2 horizontal division separation at the center graticule line excluding trace width Date 11 16 89 Change Reterence _C3 1189 Rev DESCRIPTION Product Group 46 ores SEU ATA II come eee a aL ER eee peseerete n ren ser teen Nene rre ae nee RE 1 ftue Ie Sese bi i i mente esere te Le te
51. E A SEC DIV 0 5 ms FOCUS For best defined display CLEAR MEAS MT Press to remove measurement cursors b Set Vertical MODE to CH 1 CH 2 off c Connect Function Generator FG 502 sine wave output to the CH 1 input via a 50 BNC coaxial cable and a 50 Q BNC terminatlon 7 10 2245A Operators Performance Check Procedure d Set function generator output for 1 kHz sine wave signal of five divi sions peak to peak with maximum positive dc offset e Position the bottom of the signal to the center horizontal graticule iine f Set CH input COUPLING to AC g CHECK display is roughly centered about the center horizontal graticule line h Move the test signal to the CH 2 input L Set CH 2 VERTICAL MODE to on CH 1 off j Repeat the procedure for CH 2 k Disconnect the test signal from the 2245A 2 CH 1 and CH 2 VOLTS DIV Trace Shift a Set CH 1 and CH 2 VERTICAL MODE On CH 1 and CH 2 VOLTS DIV 2 mV CH 1 and CH 2 Input COUPLING GND b Set VERTICAL MODE to CH 1 CH 2 off Position trace to center horizontal graticule line d Switch CH i VOLTS DIV through all positions from 2 mV to 5 V e CHECK trace shift does not exceed 0 2 division between steps f Set VERTICAL MODE to CH 2 CH 1 off g Position CH 2 trace to the center horizontal graticule line h Switch CH 2 VOLTS DIV through all positions from 2 mV to 5 V IL CHECK trace shift does not exceed 0 2 division between steps 2245A Operators 7 11
52. EL controls and Trigger lights TRIG D and READY to either the A or B Trigger system A when lit B when not lit Either A or B trigger can be selected for any Horizontal MODE how ever A B SELECT Is preset to A when A Horizontal MODE is selected and B when ALT or B Horizontai MODE is selected No change occurs when switching from B to X Y Horizontal MODE SLOPE Button Selects the slope positive or negative going of the trigger source signal that triggers either the A sweep or the B sweep Button lit positive going button not lit negative going 2245A Operators 2 11 Controls Connectors and Indicators TRIGO READY BU M A NM lam BS ccr i d NORM NORM CH 2 NOISE LIRE i mi RED o i SED Figure 2 5 Trigger controls and indicators HOLDOFF Controi Varies holdoff time between the end of one A sweep and the start of the next A sweep The HOLDOFF control can increase the minimum holdoff time by at least 10 times Adjusting this control can improve triggering stability of aperiodic signals l e complex digital waveforms LEVEL Control Sets the amplitude level on the trigger signal at which either the A or B sweep is triggered Adjusting the LEVEL control to either end of its range in the AUTO LEVEL trigger mode resets the limits of the Trigger LEVEL control range to the peak to peak amplitude of the trigger source signal 2 12 2245A Operators Controls Connectors and Indicators
53. ERTICAL MODE As desired see NOTE Horizontal MODE As desired 3 Press the AUTO SETUP button NOTE Normally the Auto Setup of the display is sufficient for measurement purposes lf further waveform enhancement is needed use the appropriate front panel controls to adjust the display For auto setup action see Appendix A Trace Rotation Adjustment i Perform the Initial Setup procedure Position the trace verticaily to align it with the center horizontal graticule line and 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 baseline trace paraliel to the center horizontal graticule line Use a small straight blade screwdriver or allanment tool Probe Low Frequency Compensation Misadjustment of probe compensation is a possible source of measurement error The attenuator probes are equipped with compensation adjustments 1o ensure the best measurement accuracy always check probe compen sation before making measurements 1 Connect the two supplied 10X probes to the CH 1 and CH 2 BNC input connectors 2245A Operators 4 3 Operator Checks and Adjustments 2 Connect the probe tips to the PROBE ADJUST connector and the probe ground leads to scope ground 3 Set VERTICAL MODE CH 1 Horizontal MODE A 4 Press AUTO SETUP
54. G DC TRIGGER SOURCE VERT TRIGGER SLOPE Y positive going TRIGGER HOLDOFF Min FOCUS For best defined dispiay b Connect calibration generator PG 506 Std Ampi output to the CH 1 and the EXT Z AXIS inputs via a 50 1 precision BNC coaxial cable a BNC T connector and two 50 BNC coaxial cables Set generator to Std Ampl output 5 V C Set A INTEN to maximum intensity d CHECK waveform display intensity starts decreasing at 1 8 V or less and the waveform is extremely modulated out at 3 8 V 7 48 2245A Operators Performance Check Procedure e Set A INTEN to midrange f Disconnect the test equipment from the 2245A 2 PROBE ADJUST Output a Set CH 1 VOLTS DIV 10 mV SEC DIV 0 2 ms b Connect a 10X probe to the CH 1 input connector and connect the probe tip to the 2245A PROBE ADJUST output When using Tektronix coded probes the readout changes to 1 V c CHECK For a 5 division vertical display of PROBE ADJUST square wave signal square wave period is typically 1 ms within 25 3 AUTO SETUP Functional Check a Set CH 1 COUPLING GND CH 1 VOLTS DIV 2 mV A SEC DIV 20 ns b Press the AUTO SETUP button c Check that the Probe Adjust waveform is stably displayed on the upper half of the crt 2245A Operators 49 Performance Check Procedure OPTION 15 Equipment Required See Table 7 1 Calibration generator Two 50 BNC coaxial cables Test oscilloscope 50 Precision BNC coaxial c
55. MODE cursors are used to make the time measure ments In ALT or B Horizontal MODE the timing measurements are made using either the intensified zones that appear in the A sweep trace in ALT Horizontal MODE or the B delayed waveforms in either ALT or B Horizontal MODE The OR DELAY control positions both cursors or delay times reference and delta together and the control positions the independ ent delta cursor or delay when TIME or 1 TIME measurements are se lected 3 6 2245A Operators Operators Familiarization TIME 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 The measured time difference between the two cursors or deiays is displayed in the crt readout if the Horizontal MODE is X Y pressing the TIME button causes the mes sage USE A OR ALT OR B MODE to be displayed for two seconds Changing the Horizontal MODE to X Y after TIME has been activated will cancel the measurement with no message 1 TIME Measures the time difference in frequency units hertz between the cursor positions in A Horizontal MODE or between the delay time set ting and the delta delay time setting in either ALT or B Horizontal MODE Measurement points are the left ends of the two Intensified zones in ALT Horizontal MODE Behavior for Horizontal Mode Changes If the Horizontal MODE is changed to a mode that cannot be used fo
56. NC attenuators from the test signal path C Reduce leveled sine wave generator output level until a stably triggered display is just obtainable d Set TRIGGER LEVEL fully CW e Set leveied sine wave generator output for a stable display if neces sary f Set CH 1 VOLTS DIV to 1 V 2245A Operators 7 33 Performance Check Procedure AAA rt EE n CHECK that the CH 1 signal display amplitude is four divisions or more peak to peak Note that the signal is not triggered Disconnect the test setup from the 22454 TV Fieid Trigger Sensitivity Set VERTICAL MODE CH 2 CH 1 off CH 2 VOLTS DIV tV SEC DIV 0 2 ms TRIGGER SLOPE X negative going TRIGGER MODE TV FIELD Connect TV signal generator video output to the CH 2 input via a 50 O BNC cable Set CH 2 VAR VOLTS DIV control for a 0 5 division composite sync signal CHECK that a stable display is obtained Sat CH 2 INVERT On TRIGGER SLOPE gt positive golng CHECK that a stable display Is obtained TV Line Trigger Sensitivity Set CH 2 INVERT OFF TRIGGER SLOPE negative going A SEC DIV am Horizontial MODE B B SEC DIV 20 us A B SELECT B TRIGGER MODE TV LINE CHECK that a stable display is obtained for various portions ofthe TV FIELD as the je OR DELAY control is rotated 7 34 2245A Operators Performance Check Procedure c Set CH 2 VAR VOLTS DIV DETENT calibrated TRIGGER SLOPE T negative golng
57. Performance Check Procedure Test equipment specifications described are the minimum nec essary to provide accurate results For test equipment operating informa tion refer to the appropriate test equipment instruction manual When you use equipment other than that recommended you may have to make some changes to the test setups If the exact example equipment in Tabie 7 1 is not available use the Minimum Specification column to deter mine if any other available test equipment might be adequate to do the check Performance Check Interval To ensure instrument accuracy check the performance of the 2245A after every 2000 hours of operation or once each year if used infrequently If the checks indicate a need for readjustment or repair refer the instrument to a qualified service person Preparation This procedure is divided into subsections to let you check individual sec tions of the instrument when it is not necessary to do the complete Per formance Check An Equipment Required block at the beginning of each subsection lists the equipment from Table 7 1 that is needed to do the checks in that subsection 2245A Operators 7 1 Performance Check Procedure The initial front panel control settings at the beginning of each subsection prepare the instrument for the first step of the subsection Do each of the steps in a subsection completely and in order to ensure the correct controi settings for steps that follow To ensure perfo
58. Product Group 46 EFFECTIVE ALL SERIAL NUMBERS O Page 6 6 HORIZONTAL DEFLECTION SYSTEM Heplace the Sweep Linearity with the following Sweep Linearity t 596 Sweep Linearity applies over the center eight divisions Excludes the first 1 4 division or 25 ns from the start of the magnified sweep and anything beyond the 100th magnified division H I 1 amas remet zine si emcee Presta mem tete delia mme tette e S Paar manm nens Pom nennen nen n tal N Product 2245A OPERATORS DESCRIPTION EFFECTIVE ALL SERIAL NUMBERS Page 6 6 HORIZONTAL DEFLECTION SYSTEM Replace the Sweep Linearity with the following Sweep Linearity 0 5 s div to 5 ns div 5 2 ns div 15 i Sweep Linearity applies over the center eight divisions Exciudes the first 1 4 division or 25 ns from the start of the magnified sweep and anything beyond the 100th magnified division Date 10 20 89 Change Reference _C2 0889 RE Manual Part Number _070 6558 01 Product Group 46 pm M Qo pM EI A N Ar IN tng metodo rnm me sta dA A tr te nel COMBAT TED TO EXCELLENCE Product _2245A OPERATORS DESCRIPTION EFFECTIVE ALL SERIAL NUMBERS Page 6 5 VERTICAL DEFLECTION SYSTEM Replace Delay Match with the following Delay Match CH 1 or CH 2 400 ps difference to CH 3 OR CH 4 Page 7 21 Step 14 CH 1 to CH 4 Signal Delay Match d CHE
59. REMENTS button to display the le 1 SEC gt cursors Reposition the reference cursor and the delta cursor to the second and tenth time markers respectively CHECK that the readout is 124 Hz to 126 Hz 2 le VOLTS SI Cursor Accuracy a Set CH 1 VOLTS DIV DIV SEC DIV 0 5 ms Connect calibration generator PG 506 output to the CH 1 input via a 50 Q precision BNC coaxial cable Set calibration generator to Std Ampi 0 5 Y Position bottom of the signal to the second horizontal graticule iine from the bottom Press the CURSOR VOLTS button to display the cursors je VOLTS Si Position the reference cursor to the bottom of the signal and the delta cursor to the top of the signal both cursors move with the je OR DE LAY control CHECK that the readout is between 0 493 V to 0 507 V Disconnect calibration generator 2245A Operators 7 47 Performance Check Procedure EXTERNAL Z AXIS PROBE ADJUST AND AUTO SETUP FUNCTIONS Equipment Required See Table 7 1 Calibration Generator BNC T connector Two 50 Q BNC coaxial cable Test ocsilloscope 50 Q precision BNC coaxial cable with a 10X probe 1 Check External Z Axis Input a Set READOUT intensity For a viewable readout A INTEN For a viewable trace VERTICAL MODE CH 1 CH 1 VOLTS DIV tv CH 2 INVERT Off SCOPE BW Off CH 1 Input COUPLING DC Horizontal MODE A A SEC DIV 0 5 ms Horizontal POSITION 12 o clock A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER CPL
60. SOR VOLTS Turns on the cursor volts measurement mode and displays two positionable horizontal cursors One cursor is automati cally positioned at the upper peak of the displayed waveform and the other at the lower peak The voltage difference between the upper and lower cursors is displayed in the top line of the crt graticule Cur sors can be repositioned as desired using the control to move the upper cursor and the k OR DELAY control to move both cursors to gether The measurement channel for the cursor volts measurement mode is set to Channel 1 or Channel 2 when either is displayed alone if both CH 1 and CH 2 are selected the measurement channel is set to Channel 1 uniess Channel 2 had been selected first 44 1 TIME Turns on the 1 TIME frequency measurement mode and displays two positionable vertical cursors in A MODE ALT and 8 MODE displays have two B sweeps and in ALT MODE the A sweep has two intensified zones The 1 TIME difference between the left and right cursors or edges of the B sweep is displayed in Hertz in the top line of the crt graticule The displayed value accurately represents the frequency of a repetitive input signal when the cursors or edges of the B display are positioned so that they span one compiete period of the waveform 45 TIME Turns on the delta time measurement mode and displays two positionable vertical cursors in A MODE ALT and B MODE displays have two B sweeps and in ALT MODE the A sweep has
61. Set calibration generator to Std Ampl output 0 5 V e CHECK the signal amplitude ls between 4 90 and 5 10 divisions f Move the test signal to the CH 4 input g Set VERTICAL MODE CH 4 CH 3 off CH 4 VOLTS DIV 0 1 V 7 16 2245A Operators LE Performance Check Procedure Same as b above Repeat CHECK for CH 4 Set CH 3 and CH 4 VOLTS DIV to 0 5 V Set calibration generator to Std Ampl output 2 V CHECK the signal amplitude is between 3 92 and 4 08 divisions Set VERTICAL MODE CH 3 CH 4 off CH 3 VOLTS DIV 0 5 V Move the test signal to the CH 3 input Repeat CHECK procedure for CH 3 Disconnect the test setup from the 2245A ADD Mode and CH 2 INVERT Deflection Accuracy Set VERTICAL MODE ADD ali others off CH 1 and CH 2 VOLTS DIV Div CH 1 and CH 2 Input COUPLING DC Connect calibration generator Std Ampl output to the CH 1 and CH 2 inputs via a 50 Q precision BNC coaxial cable and a BNC dual input coupler Set the calibration generator to Std Ampl output 0 2 V Position the ADD signal to the center of the crt graticule with the CH 1 and CH 2 POSITION controis CHECK That the ADD signal amplitude is between 3 92 and 4 08 divi sions Set CH 2 INVERT On CHECK That the ADD signal amplitude is 0 08 division less than half a minor graticule division or less excluding trace width sweep will free run Disconnect the test setup from the 2245A 2245A Operators f 17 Performance Check Pr
62. able Level sine wave generator Two 50 1 BNC termination 1 Signal Output a Set VERTICAL MODE CH 1 and CH 2 On light on CH 3 and CH 4 Off light off BW LIMIT Off ilght off VOLTS DIV CH 1 and CH 2 2 MV input Coupling CH 1 and CH 2 GND A and B SEC DIV i ms TRIGGER MODE AUTO LVL SOURCE VERT COUPLING NOISE HEJ b Push the CH 2 VERTICAL MODE button so that light Is off c Connect the CH 2 signal from the rear panel CH 2 SIGNAL OUT con hector to the CH 1 OR X input connector v a a 50 Q BNC cable d Align the CH 1 trace to the center graticule line e Set CH 1 input Coupling to DC f CHECK Dispiay amplitude to 4 5 to 5 5 divisions neglect trace width g Connect a 1 kHz 10 mV standard amplitude signal from the Calibra tion Generator to the CH 2 Input Connector via a 50 2 BNC cable 7 50 2245A Operators Performance Check Procedure h Set CH 2 Input Coupling to DC i Set CH 1 VOLTS DIV to 20 mV j CHECK Display amplitude to 4 5 to 5 5 divisions neglect trace width k Connect a 50 2 terminator to the CH 1 Input i Set CH 1 VOLTS DIV to 10 mV m CHECK Display amplitude to 4 5 to 5 5 divisions neglect trace width n Set CH 2 VOLTS DIV to 0 1 V 0 Connect to 50 kHz signal from the Leveled Sine Wave Generator to the CH 2 input connector via a 50 N precision BNC cable and a 50 Q BNC termination p Adjust the generator output level to produce a 6 division CH 1 display q
63. al and horizontal scale factors are displayed at the bottom of the screen On screen vertical and horizontal cursors provide accurate voltage time and frequency measurements measurement values are displayed at the top of the crt The measurement system provides direct readout of delta voltage deita time and frequency from positionable cursors Delay time and delta delay measurements for time and frequency are available in ALT and B Horizontal Modes By pressing a single button AUTO SETUP the front panel controls can be set up to produce a usable waveform display based on the voltage and time characteristics of the input signals 1 2 2245A Operators Introduction Standard Accessories The foll wing items are standard accessories shipped with the 2245A instrument 2 Probes 10X 1 5 meter with accessories 1 Power cord 1 Power cord clamp 1 Operators manual 1 Reference guide 1 Crt filter blue plastic installed 1 Fuse 2A 250 V slow blow 1 Accessory potich Zipioc See Section 8 Options and Accessories for part numbers and further Information about standard accessories and a list of the recommended optional accessories For more information on accessories and ordering assistance contact your Tektronix representative or local Tektronix Fieid Office 2245A Operators 1 3 Introduction PREPARATION FOR USE Safety Refer to the Operators Safety Summary at the front of this manual for power source
64. and a 50 Q BNC termination b Set generator for 0 2 us time marks c Position the bottom of the CH 1 signal below the bottom graticule line It may be necessary to increase the A intensify in order to see the time markers d CHECK deviation of any vertical line within the center eight horizontal divisions does not exceed 0 1 division half a minor division e Set CH 1 COUPLING to GND f Position trace slowly from the bottom graticule line to the top graticule line while making the following check g CHECK bowing or tilt of baseline trace doesn t exceed 0 1 division half a minor division within the eight vertical divisions h Disconnect test signal from the 2245A 2245A Operators 7 9 Performance Check Procedure AAA ensenae VERTICAL Equipment Required See Table 7 1 i input COUPLING Functional Check a Leveied sine wave generator Calibration generator Function generator 50 Q BNC coaxial cable Set READOUT Intensity A INTEN VERTICAL MODE CH 1 and CH 2 50 precision BNC coaxial cable 50 termination Dual input coupler For a viewable readout For a viewable trace CH 1 and CH 2 VOLTS DIV 1V CH 1 and CH 2 input COUPLING DC SCOPE BW Off CH 2 INVERT Off A B SELECT A TRIGGEH TRIGGER MODE AUTO LEVEL TRIGGER SOURCE VERT TRIGGER CPLG DC TRIGGER SLOPE 7 positive going TRIGGER LEVEL 12 o clock TRIGGER HOLDOFF Min Horizontal POSITION 12 o clock Horizontal MOD
65. anual Overail Dimensions See Figure 6 3 Dimensional drawing Height Overall 168 mm 6 6 in Center of 89 mm 3 5 in mounting rail to bottom of cabinet From cabinet 38 mm 1 5 in top or bottom to respective front pane mounting holes Between front 102 mm 4 0 in panel mounting holes Width Overall 483 mm 19 0 in Between mounting 464 mm 18 3 in hole centers Between outer 427 mm 16 8 in edges of mounting rails Between handie 450 mm 17 7 in centers 6 16 2245A Operators Performance Characteristics Table 8 3 cont Mechanicai Characteristics CHARACTERISTICS DESCRIPTION Depth Overall 916 mm 20 35 In Front panel to rear of mounting 465 mm 18 3 in rail inside Front panel to 472 mm 18 6 in rear of mounting rail outside Handles 44 mm 1 75 in Required Clearance dimensions Height 2 178 mm 7 in Width 2 448 mm 17 5 8 in Depth 2 508 mm 20 in Cooling Forced air circulation no air filter Finish Tek Blue pebble grain finish painted on aluminum cabinet Construction Aluminum alloy chassis front panel frame and rear support Plastic laminate front panel Glass laminate circuit boards 2245A Operators 6 17 Performance Characteristics 6 44 5 86 n 6 35 164 6 16 7 149 Lui nel 156 1 82 12 300 3281 12 60 320 i Dimensions are in inches mm 6558 24 Figure 6 2 Dimensional drawing standard cabinet 6 18 2245A O
66. aticule line as a starting point for the measurement at the center 2 5 divisions Exolude the first 1 4 division or 25 ns and any portion of the sweep past the 100th magnified division Set SEC DIV to 5 ns Set the Horizontal POSITION control to 12 o clock and then align the nearest time marker to the second vertical graticule line CHECK that the tenth displayed time marker is within 0 24 division left or right of the tenth graticule line Repeat the timing and linearity checks for all SEC DIV settings between 10 ns and 0 5 ms Use the SEC DV and Time Mark Generator X10 MAG settings given in Table 7 3 2245A Operators 1 47 Performance Check Procedure k Set Horizontal MODE A SEC DIV 2 ns with X10 MAG on M Set time mark generator for 5 ns time markers Repeat the magnified accuracy and linearity checks for the A Sweep at all magnified SEC DIV settings Delay Time Jitter Set X10 MAG Off A SEC DIV 1 ms Horizontal MODE ALT B SEC DIV 0 5 us Set time mark generator for 1 ms time marks Position the Intensified dot to the leading edge of the 10th time marker to display the rising edge on the B Trace using the e OR DELAY con trol it may be necessary to reduce the A intensity level to observe the intensified dot Set Horizontal MODE B B INTEN Fully CW maximum intensity CHECK that the jitter on the leading edge does not exceed one divi slon over a two second interval Disregard slow drift
67. but does not trigger with HF REJ CPLG Set Horizontal MODE A A B SELECT A Trigger k CHECK that the display is stably triggered with NOISE REJ Trigger CPLG but does not trigger with HF REJ CPLG The Trigger LEVEL control may be adjusted to improve display stability in NOISE REJ CPLG 4 150 MHz Trigger Sensitivity a Set TRIGGER CPLG to DC b Set leveled sine wave generator to produce a 1 0 division display at 150 MHz c CHECK that the display is stably triggered in DC LF REI and AC Trigger CPLG d Set Horizontal MODE B A B SELECT B Trigger 6 CHECK that using the Trigger LEVEL control the display can be stably triggered in DC LF REJ and AC Trigger CPLG f Set Horizontal MODE A VERTICAL MODE CH 2 CH 1 off CH 2 CH 3 and CH 4 VOLTS DIV 0 1 V A B SELECT A Trigger 2245A Operators 7 37 Performance Check Procedure a TRIGGER CPLG DC Move test signal from CH 1 to the CH 2 input Set leveled sine wave generator output to produce a 1 0 divislon dis play amplitude at 150 MHz CHECK that a stable display can be obtained The Trigger LEVEL control may be adjusted to improve the display stability Repeat the procedure for CH 3 and CH 4 turn on the appropriate VERTICAL MODE and move the test signal as required Move test signal to the CH 1 input Set VERTICAL MODE to CH 1 others off Remove the 2X BNC attenuator from the test signal path Set leveled sine wave generator output for a 2 2 divi
68. ct display sweep speeds for the X10 MAG displays and the unmagnifled displays 2245A Operators ont Controls Connectors and Indicators HOLD MIN SETUP Simona TIME POSITION OR DELAY Nana RA re im H c i p i 5 H 3o Fed Tee a DL alata ci Pe Irma m TRACE SEP lt POSITION Figure 2 4 Horizontai controls and indicators 6558 06A MODE Buttons Up Arrow and Down Arrow and Indica tors Select the operating mode of the horizontal deflection system Pressing the Up Down Arrow buttons selects the horizontal deflec tion mode as shown by the MODE lights Not all Measurement modes are compatible with ali horizontal deflection modes See Table 3 1 Behavior for Horizontal MODE Changes in Section 3 A Selects A sweep horizontal deflection The A sweep speed is de termined by the A SEC DIV switch setting as displayed in the ort 2 8 2245A Operators Controls Connectors and Indicators readout Whenever A MODE is selected the A B SELECT switch is set to A Trigger ALT Alternates between A sweep with an intensified zone repre senting 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 be 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 sweep speed attempting to do so forces the A sweep speed to follow the B sweep speed To increase the
69. ctive turning off CH 1 and CH 2 to display the ADD trace by itself causes the message VOLTMETER SOURCE CH 1 OR 2 ONLY to appear and cancels the measurement If calling for a voltage measurement with ADD displayed and neither CH 1 nor CH 2 displayed the CH 1 Vertical MODE is turned on and the measurement is initialized to the signal applied to the CH 1 input Two common uses for ADD mode are 1 providing a dc offset to bring an ac signal riding on top of a large dc voltage within the graticuie viewing area and 2 canceling out a large line frequency signal component to view some smail feature riding on the waveform in greater detail using common mode rejection The following general precautions should be observed when using ADD mode a Do not exceed the input voltage rating of the oscilloscope or probe D Do not apply signals that exceed the equivalent of about eight times the VOLTS DIV switch settings since large voltages may distort the dis play For example with a VOLTS DIV setting of 0 5 V the voltage ap plied to that channel should not exceed 4 V c Use CH 1 and CH 2 POSITION control settings which most nearly position the signal on each channel to mid screen when vlewed sepa rately This ensures the greatest dynamic range for ADD mode signal displays 5 14 2245A Operators Basic Applications d To have similar responses for both channels use the same Input COUPLING for both CH 1 and CH 2 The following pr
70. cursor volts measure ment is first turned on the peak voltages of the source channel signal are measured and one cursor is placed at the most positive peak and the other is placed at the most negative peak The CLEAR MEAS MT button turns off the measurement Time Measurements Press the TIME button to display the time measurement cursors The se lected measurement type and value are displayed at the top of the screen NOTE Changing the Horizontal MODE from B to X Y will cancel a time measurement mode Set Horizontal MODE back to A ALT or B and press the TIME or 1 1 TIME button to reacti vate the time measurement mode Vertical cursors are displayed for use in setting the time measurement points In A Horizontal MODE In ALT Horizontal MODE the delay measure ment is made using either the intensified zones as the measurement points or the alternate B delayed sweeps For B Delayed Horizontal MODE the delayed sweeps only are available for making timing measurements When the Horlzontal MODE is either ALT or B the B Trigger MODE must be set to RUNS AFTER if not the following message will be displayed USE RUNS AFTER DELAY TRIG MODE If the B Trigger MODE is switched away from RUNS AFTER using the front panel Trigger MODE buttons the selected TIME or 1 TIME measurement wili be canceled Pressing the TIME or 1 TIME button again will reactivate the measurement only if the 8 Trigger MODE is set to RUNS AFTER In the A Horizontal
71. cy 10 1 Trigger output 1 ms to 0 1 us time colncident with markers Signal source for gain and transient re sponse checks and adjustments Horizontal checks and adjustments Display adjust ment Time cursor checks Range less than 1 Hz to 1 KHz sinusoidal output amplitude variable up to greater than 10 V p p open circuit with dc offset adjust Low frequency checks Requires a TM500 series power module 2245A Operators Example of Test Equipment TEKTRONIX SG 503 Leveled Sine Wave Generator 2 TEKTRONIX PG 506 Calibration Generator A TEKTRONIX TG 501 Time Mark Generator TEKTRONIX FG 502 Function Generator 7 83 Performance Check Procedure item and Description Coaxial Cable 2 required Precision Coaxiai Cable Terminatlon 2 required 10X Attenuator Ratio 10X Triggering impedance 50 O checks Connectors BNC 2X Attenuator Adapter Alignment Tool Test Oscilloscope Dual Input Coupler T Connector Precision Normalizer Table 7 1 cont Minimum Specification impedance 50 Q Signal inter Length 42 in connection Connectors BNC Impedance 50 Used with PG Length 36 in 506 Calibration Connectors BNC Generator and SG 503 Sine Wave Generator Use Impedance 50 Q Signal termi
72. d Mode Vertical Modes AUTO Algebrale sum of CH 1 and CH 2 input LEVEL 1 signals or CHOP Off Lowest numbered vertical channel displayed NON On Alternates between displayed vertical AUTO or channels in the following order Ch 1 LEVEL Off Ch 2 Ch 3 CH 4 and ADD and ALT CH 4 The signal applied to the CH 4 input connector is the source of the trigger signal LINE The triggering signal is obtained from a sample of the ac power source waveform This trigger source is useful when the dis played waveform frequency is time related to the ac power source frequency CPLG Up Arrow and Down Arrow Buttons and Indica tors Select the method of coupling the input trigger signal to the A or B trigger system as directed by the A B SELECT button Pressing the Up Down Arrow buttons selects the trigger coupling as shown by the CPLG lights DC Couples dc and ail frequency components of a triggering signal to the trigger circuitry DC coupling is useful for most signals but it is especially useful for providing a stable display of low frequency or low repetition rate signals NOISE REJ Noise Reject Couples ali frequency components of the input signal to the trigger circuitry but increases the peak to peak signal amplitude required to produce a trigger event 2 16 2245A Operators Controls Connectors and indicators NOISE REJ coupling is useful for improving stability when the trigger signal is accompanied by low iev
73. ddition to the single lead or probe The ground lead of the probe provides the best grounding method for signal interconnection and ensures the maxi mum amount of signal lead shielding in the probe cable A separate ground lead with a banana plug can also be connected from the unit under test to the 2245A ground jack on the front panel 2245A Operators 3 3 Operators Familiarization Probes A probe provides the most convenient way to connect an input signal to the oscilloscope The standard 10X probes supplied with the 2245A are shielded against electromagnetic interference and have a high input impedance for low circuit loading The subminiature probe bodies are designed for probing circuitry 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 ieads as short as possible Misadjusted probe compensation can cause measurement error Check and adjust probe compensation whenever a probe is moved to a different channel or oscilloscope For the probe compensation adjustment proce dure see Section 4 Operator Checks And Adjustments For detailed operating considerations and probe maintenance see the in struction sheet supplied with the probe Coaxial Cables Signal input cables can greatly affect the accuracy of a displa
74. duce a 7 0 division sine wave display amplitude at 500 kHz d Add a 10X and a 2X BNC attenuator before the 50 0 BNC termination for a 0 35 division display amplitude e CHECK that the display cannot be triggered in either HF REJ of NOISE REJ CPLG f Set Horizontal MODE 3 A B SELECT B Trigger B SEC DIV 1 us g CHECK that the display cannot be triggered in HF REJ or NOISE REJ CPLG by adjusting the Trigger LEVEL control 3 25 MHz Trigger Sensitivity a Set Horizontal MODE A A B SELECT A Trigger TRIGGER CPLG DC A SEC DIV 50 ns b Remove the 10X and 2X BNC attenuators from the signal path c Set leveled sine wave generator output to produce a 7 0 division dis play amplitude at 25 MHz d Add a 10X and a 2X BNC attenuator before the 50 Q BNC termination e CHECK that the display Is stably triggered In DC LF REJ and AC Trigger CPLG the display is not triggered in NOISE REJ and HF REJ Trigger CPLG settings f Set TRIGGER CPLG DC Horizontal MODE B A B SELECT B Trigger B SEC DIV 20 ns 7 30 2245A Operators Performance Check Procedure g CHECK that using the Trigger LEVEL control the display can be stabiy triggered in DC LF REJ and AC Trigger CPLG the display can not be triggered In NOISE REJ and HF REJ Trigger CPLG settings h Set leveled sine wave generator SG 503 to produce a 1 4 division dispiay at 25 MHz i CHECK that the display can be stably triggered with NOISE REJ Trig ger CPLG
75. e trace over the other and then aligning the measurement point using the control Additional resolution may be obtained by advancing the B SEC DIV switch setting to further expand the B Sweep traces FIRST POINT OF INTEREST IME DIFFERENCE e SECOND POINT REFERENCE OF INTEREST GRATICULE LINE 6558 21 Figure 5 6 Time difference between two delays 2245A Operators 5 13 Basic Applications Add Mode With the Vertical MODE set to ADD the resulting waveform is the algebraic sum of the signals applied to the Channel 1 and Channel 2 inputs CH 1 CH 2 A plus symbol appears in the readout between the CH 1 and CH 2 VOLTS DIV setting readout to indicate that ADD is active If the CH 2 INVERT feature is turned on INVERT button light on the waveform dis played is the difference between the signals applied to the Channei 1 and Channel 2 inputs Neither CH 1 nor CH 2 waveform needs to be displayed to obtain the ADD trace but any or ALL vertical input channeis may be dis played at the same time if desired When CH 1 and CH 2 VOLTS DIV switches are set to the same setting the total deflection factor in the ADD mode is equal to the deflection factor indicated by either VOLTS DIV readout The voltage 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 CH 1 and CH 2 must be at the same VOLTS DIV setting If any voltage measurement function is a
76. e CH 1 input connector 2 Set Vertical MODE CH 1 Horlzontal MODE A 3 Press AUTO SETUP button 2245A Operators 5 1 Basic Applications 4 Adjust the CH 1 VOLTS DIV control so that the signal filis as much of the screen as possible 5 Press the CURSOR VOLTS button to display the voltage cursors The voltage cursors are initialized to the peak to peak voltage levels of CH 1 See Figure 5 1 NOTE Voltage cursors are Initialized to levels seen by the peak detector circuitry Noise and other signals riding on the sig nal to be measured will cause a slight displacement of the cursors from the displayed waveform peaks and above 50 MHz the bandwidth rolioff of the trigger circuit will affect the initial cursor positions on the waveform VOLTAGE DIFFERENCE RN HERI LLL III UL DU LLL M 6558 16 Figure 5 1 Voltage difference measurement using cursors 5 2 2245A Operators Basic Applications 6 For a peak to peak voltage measurement slightly reposition the cur sors as necessary to precisely align them with the peaks of the waveform The je OR DELAY contro positions both cursors together keeping the original difference between cursors and the i control positions the Independent cursor Read the measurement value dis played in the top line of the readout 7 To make voltage difference measurements between any other locations on the waveform move the le cursor to the more negative point of interest then
77. e removed at any time by pressing the CLEAR DISPLAY button once PRESET TV TRIG SLOPE FOR SYNC Factory Settings default is YES Seiecting 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 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 3 10 2245A Operators Operators Familiarization CONFIGURE KEEP READOUT ON IN SGL SEG 4 CH 4 CHOP AL T RUNNING 6558 13 Figure 3 4 Configure Menu After YES or NO is selected the SERVICE MENU display returns Select INTERNAL SETTINGS MENU to continue with the testing or select QUIT to return to normal oscilloscope operating mode Self Cal Measurements This selection does a self characterization of the vertical channels 1 and 2 and the horizontal timing The SELF CAL MEASUREMENTS routine stores calibration constants that set the accuracy of the internal measurement system NOTE SELF CAL MEASUREMENTS can be performed anytime af ter a 20 minute warmup time to ensure the accuracy stated in Section 6 2245A Operators 3 11 Operators Familiarization IP A ei mo te en Internal Settings Menu The INTERN
78. e sweeps vertically in the graticule area for ease of viewing the separate traces NOTE When the TIME button is pushed the delay time measure ment channel is automatically set to the lowest numbered active channel and the delta time measurement channel is set to the next lowest numbered active channel If one of the measurement channels is turned off when the time delay measurement mode is active both intensified zones will be displayed on the other measurement channel Both intensified zones must be displayed on the same channel for making period pulse width or rise time and fall time measurements If only a single channel is selected for dis play both delays will default to that channel 5 12 2245A Operators Basic Applications 6 Using the center vertical graticule line as a reference point set the ref erence delay to align the B Sweep display of the first point of Interest to be measured to that reference point with the je OR DELAY control Set the time delay to align the B Sweep display of the second point of interest to the reference point using the gt control The time difference between the two B Sweep delays is displayed at the top of the screen Once the measurement points are identifled 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 on
79. ed 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 LINE FROM A SOURCE Starts the B sweep at the beginning of the video signal line received after the delay time has been met SLOPE polarity defaults to the A Trigger SLOPE This must match the composite sync polarity to obtain correct triggering on the horizontal sync pulse GD SOURCE Up Arrow and Down Arrow Buttons and indi cators Select the trigger source for either the A or the B Trigger system as directed by the A B SELECT button Pressing the Up Down Arrow SOURCE buttons selects the trigger source for A or B trigger system as shown by SOURCE lights VERT Selects the trigger signal from the displayed waveforms The TRIGGER MODE and VERTICAL MODE switch settings determine the trigger signal source selection When VERT is selected one or more of the SOURCE lights will be on to indicate the trigger signal source See Tabie 2 1 for VERT Trigger SOURCE selections CH 1 The signal applied to the CH 1 OR X input connector is the source of the trigger signal CH 2 The signal applied to the CH 2 input connector is the source of the trigger signal CH 3 The signal applied to the CH 3 input connector is the source of the trigger signat 2245A Operators 2 15 Controls Connectors and Indicators Table 2 1 VERT Trigger SOURCE Trigger ADD Trigger Source Selected an
80. el noise HF REJ High Frequency Reject Attenuates high frequency triggering 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 Frequency Reject Attenuates low frequency trig gering signal components below 100 kHz and blocks the dc component of the trigger signal LF REJ coupling is useful for producing stable triggering on the high frequency components of complex waveforms and rejecting low frequency interference or power supply hum from the trigger signal AC Attenuates trigger signal frequency components below 50 Hz and biocks the dc component of the signal AC coupling is useful for triggering on ac waveforms that have a large dc offset Rear Panel Refer to Figure 2 6 for location of items 39 through 41 EXT Z AXIS INPUT Connector Connects externai signals to the Z AXxis amplifier for intensity modulating the 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 Z Axis voltage above the threshold voltage decreases the intensity and 3 8 V or more produces noticeable modulation The Z Axis signals must be time related to the displayed signal to obtain a fixed intensity modulated crt display
81. erly installed X 2245A Operators 2245A Operators eee tee rts statt s A are nennen ment Introduction PRODUCT OVERVIEW Description The 2245A is a 100 MHz four channel dual sweep portable oscilloscope for general purpose use Figure 1 1 A microprocessor based operating system controls most of the functions in the instrument including a voltage and time cursor measurement system and a single button automatic front panel setup feature A menu driven service mode provides for con figuring of single sweep readout displays internal calibration and servicing diagnostics Figure 1 1 The 2245A Oscilloscope 2245A Operators 1 1 introduction netti EN IE eean The vertical deflection system has four input channels Two channels have 11 basic deflection factors from 2 mV to 5 V per division and two channels have two basic deflection factors of 0 1 V and 0 5 V per division Basic defiection factors can be extended with attenuator probes VOLTS DIV readouts are switched to display the correct vertical scale factors when properly coded probes are connected to the vertical input connectors The horizontal deflection system provides single dual or delayed sweeps from 0 5 s to 20 ns per division delayed sweep 5 ms to 20 ns per division The trigger system provides stable triggering over the full bandwidth of the vertical deflection system Alphanumerlo crt readouts of the vertic
82. es the bandwidth of the vertical deflec tion system and trigger system to 20 MHz when the button is lit The full vertical deflection bandwidth is available when the SCOPE BW but ton Is not lit CH 2 INVERT Button Inverts the Channel 2 input signal when the INVERT button is lit The Channel 2 input signal in ADD mode and the Channel 2 trigger signal pickoff are also inverted A down arrow symbol is displayed be tween the Channel 1 and Channel 2 VOLTS DIV readout when the iN VERT mode is on COUPLING Buttons Select the method of coupling input signals to the Channel 1 and Channel 2 attenuators GND Disconnects the input signal and grounds the input of the asso ciated vertical attenuator to provide a zero ground reference voit age display The COUPLING switch is in the ground position when the AC and the DC buttons are not lit A ground symbol 7 7 is displayed to the right of the associated VOLTS DIV readout AC Capacitively couples the input signal to the vertical attenuator when the AC button is lit Turning on AC Coupling turns off DC Coupling AC Coupling blocks the do component of the input signal The lower 3 dB frequency limit is 10 Hz or less when using either a 1X probe or properly terminated coaxial cable it is 1 Hz or less using a compensated 10X probe With AC Coupling selected an AC symbol fu is displayed to the right of the associated VOLTS DIV readout An ac symbol is also displayed after the
83. fled dot is positioned at or before the second time marker Turn the le oR DELAY control clockwise until the delay readout stops increasing largest number CHECK that the intensifled dot is positloned at or after the 99th time marker located at a Delay Time of 9 9 ms Disconnect the time mark generator from the 2245A X Axis Gain Accuracy Set Horizontal MODE X Y VERTICAL MODE CH 2 CH 1 off CH 1 and CH 2 VOLTS DIV 10 mV CH 1 input COUPLING DC CH 2 input COUPLING GND Connect calibration generator Std Ampl output to the CH 1 input via a 50 2 precision BNC coaxial cable Set calibration generator for Std Ampl output 50 mV CHECK X Axis amplitude is between 4 85 and 5 15 horizontal divi sions Disconnect calibration generator f44 2245A Operators 11 12 a Performance Check Procedure X Y Phase Difference Set HORIZONTAL MODE A VERTICAL MODE CH 1 CH 2 off CH 1 Input COUPLING DC Connect leveled sine wave generator output to the CH 1 input vla a 50 Q BNC coaxial cable and a 50 OQ BNC termination Set leveled sine wave generator output for six divisions of signal display amplitude at 50 kHz Set Horizontal MODE X Y CH 1 Input COUPLING GND Position dot to graticule center Set CH 1 Input COUPLING to DC CHECK ellipse opening at the center is 0 3 division or less measured horizontally X Axis Bandwidth Set VERTICAL MODE to CH 2 CH 1 off Set leveled sine wave genera
84. g these procedures refer the instrument to a qualified service person Initial Setup The foliowing procedure may be used to set up front panel controls when input connectors 1 Press in the POWER switch button ON and let the instrument warm up 20 minutes is recommended for maximum accuracy 2 Set the Instrument front panel controls to obtain a baseline trace Vertical Controis VERTICAL MODE CH 1 POSITION Center the trace VOLTS DIV tY VOLTS DIV VAR Calibrated detent Channel 1 COUPLING GND 2245A Operators 4 1 Operator Checks and Adjustments Horizontal Controls MODE A POSITION Center the trace X10 MAG Off A SEC DIV 0 1 ms SEC DIV VAR Calibrated detent Trigger Controls HOLDOFF MIN A B SELECT A MODE AUTO LEVEL SOURCE VERT CPLG DC Display A INTEN Desired brightness FOCUS Best trace definition READOUT Desired brightness SCALE ILLUM Desired brightness Measurement Functions CLEAR MEAS MT Press to remove any displayed cursors Auto Setup Function The Auto Setup function can be used to automatically set up the front panel controls to produce a usable display of the applied signal t Connect signal s to be displayed to the appropriate input connector s For triggering to be set up properly when the AUTO SETUP button is pressed connect the trigger source signal to the lowest numbered channel that will be turned on 4 2 2245A Operators Operator Checks and Adjustments 2 Set V
85. ginal materials are unfit or not available then repackage the Instru ment using the following procedure 1 Use a corrugated cardboard shipping carton with a test strength of at least 275 pounds and an inside dimension at least six inches greater than the Instrument dimensions if instrument is being shipped to a Tektronix Service Center enciose 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 Completely wrap the instrument with polyethylene sheeting or equiva lent to protect the outside finish and keep harmful substances out of the instrument Cushion instrument on all sides with three Inches of padding material or urethane foam tightly packed between the carton and the instrument Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and your own return address on the shipping carton 2245A Operators 1 7 22454 Operators Controls Connectors and Indicators Crt Power and Display Refer to Figure 2 1 for location of items 1 through 9 1 POWER Switeh Turns on or off instrument power Press for ON or OPE At least one VERTICAL MODE button will light when the power is turned on The front panel setup existing when the power Is turned off will return when the power is turned on again 2 A
86. given in this section are examples of typical applications using this measurement system After becoming familiar with the controls indicators and capabilities of the instrument you can develop convenient methods for making special measurements for your own applications A brief description of how the graticule markings are used in making measurements is given in Section 3 of this manual When a procedure calls for Initial Setup or Auto Setup Function refer to the OPERATOR CHECKS AND ADJUSTMENTS Section 4 Certain signals such as video or aperiodic non repeating signais and signals con taining many unrelated frequency components may require more adjustment of the triggering controls to obtain the best display Voltage Measurement Cursors The CURSOR VOLTS function can accurately measure signals displayed on CH 1 or CH 2 Voltage measurements using the cursors may also be done on CH 3 CH 4 and ADD waveforms by setting the VOLTS DIV switch set ting of the selected measurement channel to the same scale factor as the signal to be measured However measurements on CH 3 or CH 4 input signals will be less accurate than on the CH 1 or CH 2 input signais Volts cursors are available for making measurements in the both the A and X Y horizontal modes Voltage Difference Use the following procedure steps as a guideline in making voitage difference measurements using the positionable voltage cursors 1 Apply the signal to th
87. gnal source for the trigger system when the trigger source is VERT 2245A Operators 2 3 Controls Connectors and Indicators ALI VERTICALI TO E CEE ee nen pt CHI ADD CH2 CH3 CH4 CHOP ILE ud Q d LI 9 AT MASIA IIo Set PM MEM pF AO FELL CIPIT PUTA RED Pp Tried pin VOLTS DIV SND BOTH UH bp Y up i d ps MO 20pF lt 400V pk Figure 2 2 CH 1 and CH 2 vertical controls and indicators 12 Channel 1 and Channel 2 VOLTS DIV Switches Select cali brated deflection factors for Channel 1 and Channel 2 from 2 mV per division to 5 V per division in a 1 2 5 sequence of 11 steps The switches are detented continuous rotation controls with no end stops The VOLTS DIV readouts reflect attenuation factors of coded attenuator probes connected to the vertical inputs 2 4 2245A Operators Controls Connectors and Indicators CH 1 AND CH 2 VOLTS DIV VAR Controis Allow the CH 1 and CH 2 vertical deflection factors to be increased up to at least 2 5 times Vertical deflection factors are greater than the VOLTS DIV switch setting when the UNCAL indicator is lit and a greater than symbol gt is displayed to the left of the associated VOLTS DIV readout The VOLTS DIV settings are calibrated when the VAR control is in the fully clockwise detent position UNCAL indicator Lights when either CH 1 or CH 2 VOLTS DIV set ting is uncalibrated variable function in effect SCOPE BW Button Reduc
88. grounding and other safety information about the use of the instrument Before connecting the 2245A to a power source read this section and the Safety Summary Line Fuse S CAUTION This instrument can be damaged if the wrong line fuse is installed Verify the proper value of the power input fuse with the following procedure 1 Press in the fuse holder cap and release it with a slight counter clockwise rotation 2 Pull 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 Line Voltage and Power Cord The 2245A operates on line voltages from 90 to 250 V with line frequencies ranging from 48 to 440 Hz No line voltage selecting is necessary Instru ments are shipped with the power cord that was requested on the order The power cord must match the power source outlet if it does not con tact your Tektronix representative or local Tektronix Field Office See Figure 1 2 for optional power cords available The detachable three wire power cord has a three contact plug for con nection to the power source and the protective ground The power cord is held to the rear panel by a clamp The protective ground contact on the plug connects through the power cord protective ground conductor to the accessible metal parts of the instrument 1 4 2245A Operators Introduction WARNING For electrical shock protecti
89. icule center 34 dB or more at 100 MHz Channel isolation tested with eignt division input signal I1MO t1 095 a 20pF ti pF 400 V dc peak ac 800 V p p at 10 kHz or less See Figure 6 1 a f Performance Requirement not checked in manual 6 4 2245A Operators Performance Characteristics Tabie 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS VERTICAL DEFLECTION SYSTEM ALL CHANNELS Bandwidth Limit 3 dB bandwidth 20 MHz 15 Low Frequency Linearity Relative to center screen Within 15 Linearity is measured by positioning a two division test signal anywhere on screen and noting the amplitude change TRACE SEP Control Position Range At least 4 divisions CHOP Mode Ciock Rate 625 kHz 10 Delay Match CH 1 or CH 2 to CH 3 or CH 4 Less than 200 ps difference HORIZONTAL DEFLECTION SYSTEM Sweep Range A Sweep 0 5 s div to 20 ns div in a 1 2 5 sequence A X10 magnifier extends maximum sweep speed to 2 ns div B Sweep 5 0 ms div to 20 ns div in a 1 2 5 sequence X10 magnifier extends maximum sweep speed to 2 ns div Accuracy Unmagnified Magnified 15 C to 35 C t 296 t39 10 C to t C 39 d 4 and 35 C to 55 C Sweep Accuracy applies over the center eight divisions Excludes the first 1 4 division or 25 ns from the start of the magnified sweep and anything beyond the 100th magnified division a Performance Requirement not checked in manua
90. ins on until the final trace in the sequence is completed The readout and cursors can be set to turn on briefly at the end of the sequence when using a camera factory setting default mode or they can be set to remain on by changing the instrument configuration from the CON FIGURE menu see Service Menu Features in Sectlon 3 B Trigger Modes AUTO LEVEL Sets the range of the Trigger Level control to the peak to peak limits of an adequate B Trigger source signal and trig gers the B sweep The auto level range is reset when triggering is lost TRIGGER LEVEL control is rotated to either end stop or AUTO LEVEL Trigger MODE is reselected AUTO LEVEL mode s useful for quickly locating an ap propriate triggering level The B sweep operates in RUNS AFTER mode when the trigger source signal amplitude is too low or the frequency is below 10 Hz Switch to NORM triggering if the repetition rate Is too slow for auto leveling The A Sweep must be running free running or triggered for B Sweep to trigger 2 14 2245A Operators Controls Connectors and indicators RUNS AFTER Starts the B sweep immediately after the delay time selected by the le OR DELAY controt The Trigger MODE must be in RUNS AFTER before time measure ments can be selected when the Horizontal MODE is ALT or B A time measurement will be canceled if the Trigger MODE Is changed from RUNS AFTER while in the ALT or B Horizontal MODE NORM The B sweep is trigger
91. ions 03 and 30 High performance camera C30B Option 01 Probes Active probe Power supply for active probe Current probes Environmental probe High voltage probe 1X 10X passive probe Subminiature 10X probe Ground isolation monitor isolator for floating measurements Viewing Hoods Pn P6202A 1101A P6021 1 52 m P6022 1 52 m A6302 AM503 A6303 AM503 P6008 1 83 m P6009 2 74 m P60638 1 83 m P6130 2 m A6901 A6902B i m mm die dm CP p p Appendix A Table A 1 AUTO SETUP Control Settings FRONT PANEL CONTROL AUTO SETUP ACTION SCOPE BW Off X10 MAG Off Horizontal POSITION Midrange if not within 1 division of midrange The Horizontal position control does not affect the position of the trace until moved through the point corresponding to the trace position set by AUTO SETUP Horizontal MODE A if A or X Y selected ALT if ALT or B selected TRIGGER A B SELECT A If A Horizontal MODE selected by AUTO SETUP otherwise B MODE AUTO LEVEL nea B MODE RUNS AFTER if ALT or B selected otherwise as selected A SOURCE VERT B SOURCE VERT if ALT or B selected otherwise as selected A CPLG NOISE REJ if SOURCE Volts Div is set to 2 mV by AUTO SETUP otherwise DC B CPLG NOISE REJ if SOURCE Vojts Div is set to 2 mV by AUTO SETUP otherwise DC A SLOPE As selected B SLOPE As selected A LEVEL Nominaily midway between peaks of A SOURCE signal
92. ision 6 CH 2 INVERT Trace Shift a Set VERTICAL MODE CH 2 CH 1 off CH 2 input COUPLING GND b Position trace to center horizontal graticule line C Set CH 2 INVERT On d CHECK trace shift does not exceed one division e Set CH 2 INVERT Off CH 2 Input COUPLING DC 7 CH 1 and CH 2 VAR VOLTS DIV Range x Set VERTICAL MODE to CH 1 CH 2 off d Position CH 1 and CH 2 traces to the center horizontal graticule line 2245A Operators 13 Performance Check Procedure c Set CH 1 VOLTS DIV 10 mV CH 1 VAR VOLTS DIV Fully CCW d Connect calibration generator PG 506 Std Ampi output to the CH 1 input via a 50 Q precision BNC coaxial cable Set generator Std Ampl output to 50 mV e CHECK the signal amplitude is two divisions or less f Set CH 1 VAR VOLTS DiV Detent calibrated Vertical MODE CH 2 CH 1 off CH 2 VOL TS DIV 10 mV g Position CH 2 trace to the center horizontai graticule line h Move the test signal to the CH 2 input i Set CH 2 VAR VOLTS DIV fully CCW j Repeat the CHECK procedure for CH 2 k Set CH 2 VAR VOLTS DIV to detent calibrated position 8 Low Frequency Linearity a Set VERTICAL MODE CH 1 CH 2 off CH 1 VOLTS DIV 10 mV SCOPE BW ON b Set calibration generator to Std Ampi output 20 mV c Move the test signal to the CH 1 input d Position the top of the signal to top graticule line 8 CHECK the signal amplitude is between 1 9 and 2 1 divisions f
93. l 2245A Operators 6 5 Performance Characteristics Table 6 1 cont CHARACTERISTICS PERFORMANCE REQUIREMENTS e I TTT etici FTF ici PPT TV du ALI HORIZONTAL DEFLECTION SYSTEM cont Sweep Linearity relative to center two displayed divisions POSITION Control Range Normal Displays X Y Displays X10 Magnifier Registration X10 to X1 Variable Control Range Sweep Length Delay Time Delay Control Range Jitter Delta Time Delta Control Range Zah Sweep Linearity applies over the center eight divisions Excludes the first 1 4 division or 25 ns from the start of the magnified sweep and anything beyond the 100th magnified division Able to move the start of the sweep to the right of the center vertical graticule able to move a time mark corresponding to the end of the tenth division of an unmagnified sweep to the left of the center graticule At least 13 divisions Expands the normal sweep by ten times around that portion of the sweep positioned at the center vertical graticule line 0 5 division or less shift Continuously variable between calibrated SEC DIV settings Extends both the A and 8 sweep time per division by at least a factor of 2 5 Greater than 10 divisions Less than 0 1 division to 10 times the A SEC DIV switch setting Maximum value does not exceed end of the A Sweep 1 part in 20 000 or less peak to peak during a two second time interval 0 to greater than
94. lications 11 Set the VOLTS DIV and VOLTS DIV VAR controls to match the ampli tude of the phase shifted signal to that of the reference waveform as shown in Figure 5 5B Use the Vertical POSITION control as necessary to align the two waveforms vertically 12 Position the cursors to a positive or negative crossing of each signal as shown in Figure 5 5B NOTE Figure 5 5B shows the delta time measurement made from the second positive crossing of each waveform The delta time could also be measured from the first positive crossing near the left edge of the screen or the first negative crossing near center screen Read the deita time at the top of the graticule and calculate the phase difference from the formula deita time Phase Difference in degrees X 360 reference time or as in Figure 5 5 ISIN 4 3609 22 5 336 ns NOTE For increased resolution of the phase measurement the sweep may be increased and both cursors repositioned to the measurement points see Figure 5 5C The X10 MAG feature may also be used in a similar manner by placing the measurement points at the center vertical graticule line be fore pressing the X10 MAG button you may want to reduce the A SECIDIV setting prior to turning on the X10 MAG Time Delay Measurement When using ALT Horizontal Mode the TIME measurement mode provides two intensified zones on the A trace There are also two B delayed traces matchi
95. lications CH 1 SIGNAL WITH UNWANTED LINE FREQUENCY COMPONENT CH 2 SIGNAL FROM LINE FREQUENCY SOURCE INVERTED SIGNAL WITH LINE FREQUENCY COMPONENT CANCELED B RESULTANT SIGNAL 6558 22 Figure 5 7 Eliminating common mode signais 5 16 2245A Operators PERFORMANCE 2245A Operators e memore emite serra Pena Performance Characteristics Introduction Electrical characteristics in Table 6 1 apply when the 2245A has been cali brated at an ambient temperature between 20 C and 30 C has warmed up at least 20 minutes and is operating in an ambient temperature between 10 C and 55 C unless otherwise noted items listed in the Performance Requirements column are verifiable quali tative or quantitative limits that define the measurement capabilities of the instrument Environmental Specifications of the 2245A are in Table 6 2 and Mechanical Specifications are in Table 6 3 Recommended Calibration Schedule To ensure accurate measurements check the performance of this instru ment every 2000 hours of operation once each year If used infrequently When components are replaced affected circuits may have to be readjusted 2245A Operators 6 1 Performance Characteristics Table 6 1 Electrical Characteristics CHARACTERISTICS PERFORMANCE REQUIREMENTS VERTICAL DEFLECTION SYSTEM CH 1 AND CH 2 Deflection Factor Range Accuracy includes ADD MODE and CH 2 INVERT 15
96. n off upon return to room ambient during step 6 Excessive conden sation shall be removed before operating during step 7 To 4 570 m 15 000 ft Maximum operating temperature decreases 1 C per 1000 ft above 5000 ft To 15 240 m 50 000 ft Five cycles 120 hours referenced to MiL T 28800D paragraph 4 5 5 1 2 2 for type lil class 3 instruments Non operating and operating at 95 096 to 4295 relative humidity Operating at 30 C and 455 C for ail modes of operation Non operating at 30 C to 1460 C Meets Category B a Performance not checked In manual 2245A Operators 6 13 Performance Characteristics A et c nn Table 6 2 cont Environmental Characteristics CHARACTERISTICS Electrostatic Discharge Vibration operating Bench Handiing Test cabinet on and cabinet off Transportation Packaged Vibration Test Package Drop Test DESCRIPTION Withstands discharge of up to 20kV Test performed with probe containing a 500 pF capacitor with 1 kO resistance charged to the test voitage Conforms to Tektronix Standard 052 2862 00 15 minutes along each of 3 major axes at a total displacement of 0 25 inch p p 4 g at 55 Hz with frequency varied from 10 Hz to 55 Hz in 1 minute sweeps Hoid from 10 minutes at 55 Hz In each of the three maior EE All major resonances must be above H2 MiL STD 810D Method 516 3 Procedure VI MIL T 28800D Paragraph 4 5 5 4 3 Meets the limi
97. n the first cursor to the rising edge at the point where it crosses the 1096 reference graticule line Then use the di control to align the second cursor to the point where the rising edge crosses the 9096 graticule line and read the rise time displayed in the top line of the crt readout see Figure 5 4 2245A Operators 5 7 Basic Applications RISE TIME AT HHH Figure 5 4 Rise time measurement Phase Measurements Making a phase measurement is done by first setting a reference for the full 360 degree waveform period Use the following procedure as a guide 1 Apply the reference waveform to the CH 1 input connector any channel may be used but CH 1 and CH 2 provide the most signal scaling possi bilities Use the standard 10X attenuator probe supplied with the instru ment to make the signal connections as they produce very littie signal loading to a circuit under test and produce matched delays For phase measurements external loading of a circuit and different delays in the signal connection paths will produce incorrect results 5 8 2245A Operators 10 Basic Applications Select CH 1 for display using the Vertical MODE buttons and set the Input COUPLING for CH 1 and CH 2 to DC AC may be used if the signals to be measured are riding on a dc voltage but set both inputs to the same coupling AC coupling produces some signal phase shift es peclally at lower frequencies Set the CH 1 VOLTS DIV control to di
98. ne wave generator SG 503 output to the CH 1 input via a 50 Q precision BNC coaxial cable and a 50 2 BNC termina tion Set the leveled sine wave generator SG 503 output for a five division signal display amplitude at 100 MHz Set CH 2 CH 3 and CH 4 VERTICAL MODE On CH 1 off CHECK display amplitude is 0 1 division or less excluding trace width on the CH 2 CH 3 and CH 4 traces Move sine wave generator signal to the CH 2 input Set CH 1 CH 3 and CH 4 VERTICAL MODE On CH 2 off TRIGGER SOURCE CH 2 CHECK display amplitude is 0 1 division or less excluding trace width on the CH 1 CH 3 and CH 4 traces Move sine wave generator signal to the CH 3 input Set CH 1 CH 2 and CH 4 VERTICAL MODE On CH 3 off TRIGGER SOURCE CH 3 CHECK display amplitude Is 0 1 division or less excluding trace width on the CH 1 CH 2 and CH 4 traces 724 2245A Operators 21 Performance Check Procedure Move slne wave generator signal to the CH 4 input Set CH 1 CH 2 and CH 3 VERTICAL MODE On CH 4 off TRIGGER SOURCE CH 4 CHECK display amplitude is 0 1 division or less exciuding trace width on the CH 1 CH 2 and CH 3 traces Disconnect the test setup AC Coupied Lower 3 dB Point Set A SEC DIV 10 ms VERTICAL MODE CH 1 all others off TRIGGER SOURCE VERT TRIGGER MODE NORM Connect function generator FG 502 output to the CH 1 input via a 50 Q BNC coaxlai cable and a 50 Q BNC termination
99. ng Readout calcuiated from TIME cursor positions 1 0 of reading 2 of one vertical division high frequency display errors 2245A Operators CHARACTERISTICS Delay Accuracy A Sweep Trigger Point to Start of B Sweep Deflection Factors Accuracy Y Axis 15 C to 35 C 10 C to 18 C and 35 C to 55 C X Axis 150 to 35 C 10 C to 15 C and 35 C to 55 C Horizontal X Axis 3dB Bandwidth Phase Match DC Coupied Performance Characteristics Table 6 1 cont PERFORMANCE REQUIREMENTS 0 5 of reading 5 of one division of the A Sweep 25 ns X Y OPERATION Same as Vertical deflection system with the VOLTS DiV variabile controls in calibrated detent position Within 12 Within 33 2 Within 396 Within 14 8 3 MHz or more t3 degrees from do to 50 kHz EXTERNAL Z AXIS INPUT Active Region Lower Threshold intensity decreases above this voltage Signal Required to Modulate an A or B Trace Maximum input Voltage IN input Loading 1 8 volts or less 3 8 volts or less provides noticeabie modu lation of a normal intensity trace Usable frequency range is do to 10 MHz External Z Axis signal does not affect the readout or the intensified zone Intensity 30 V dc peak ac 30 V p p ac at 1 kHz or less a Represents less than one LSTTL load A Performance Requirement not checked in manuai 2245A Operators 6 9 Performance Characteristics
100. ng each intensified zone 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 delay time measurements 2245A Operators 5 11 Basic Applications 1 Apply the signal or signals that measurements are to be made on to the vertical input connector s When making delay measurements between two different channels always connect the reference signal to the lower numbered channel and the delta signal to the higher numbered active channel Turn on the Vertical MODE channels needed to display the sig nals 2 Set A Trigger MODE to AUTOLEVEL B Trigger MODE to RUNS AFTER and A Trigger SOURCE to VERT 3 Use a VOLTS DIV setting that produces a usable vertical display ampli tude for viewing ease use an A SEC DIV setting that produces two to five repetitions or cycles of the signal across the graticule area NOTE When viewing multiple traces it is best to limit the vertical amplitude to about two divisions so that good trace sepa ration may be obtained in the display 4 Switch the Horizontal MODE to ALT Advance the SEC DIV setting at least one position to obtain a faster B SEC DIV setting 5 Press the TIME button to turn on the time delay measurement mode which displays two Intensified zones on the A Sweep trace and two alter nate B Delay Sweeps Use the TRACE SEP and Vertical POSITION con trols to position th
101. ng on input signal characteristic if more than one complete cycle can be dis plaved at 20 ns the A sweep may be set to Appendix A Table A 1 cont AUTO SETUP Control Settings FRONT PANEL CONTROL AUTO SETUP ACTION 20 ns if A SEC DIV was set to 50 ns by sli AUTO SETUP otherwise two speeds faster than A SEC DIV CURSORS TIME POSITION Measurement Reinitialized A INTEN B INTEN Midrange if pot rotation is less than 2896 READOUT from CCW stop otherwise as selected A intensify is set to 3096 if Horizontal MODE is ALT The A INTEN B IN TEN and READOUT controls do not affect display intensity until moved through the point corres ponding to the intensity level set by the AUTO SETUP TRACE SEP Midrange If ALT or B selected otherwise as selected The TRACE SEP control does not affect the trace separation untii moved through the point corresponding to the trace position set by AUTO SETUP HOLDOFF As adjusted CH 1 VAR CH 2 VAR As adjusted SEC DIV VAR Measurements AS selected Appendix A ze UU MAH a nT Table A 2 MIN SETUP Control Settings FRONT PANEL CONTROL HORIZONTAL MODE TRIGGER A LEVEL B LEVEL CH 1 and CH 2 COUPLING Channel turned on VERTICAL MODE CH 1 CH 2 and ADD CH 1 and CH 2 VOLTS DIV SEC DIV B SEC DIV CURSORS TIME POSITION B020100 and above MIN SETUP ACTION Changes to ALT if B selected Nominally midway between peaks of SOURCE signal
102. o 140 V Dc voltage checks DM501A DMM Voltage accuracy and adjustments Digital 0 1596 4 1 2 Multimeter 4 digit display Requires a TM500 series power module 2245A Operators 7 5 Performance Check Procedure INDEX TO PERFORMANCE CHECK PROCEDURE DISPLAY 1 TRACE ROTATION ur se re ee 7 8 24 GROMO sea AAA AREE E 7 9 VERTICAL 1 Input COUPLING Functional Check 0 7 10 2 CH 1 and CH 2 VOLTS DIV Trace Shift lt 7 11 3 CH 3 and CH 4 VOLTS DIV Trace Shift 7 12 4 CH 1 and CH 2 VAR VOLTS DIV Trace Shift 7 12 5 CH 1 and CH 2 Input COUPLING Trace Shift 7 13 6 CH 2 INVERT Trace Sh eh RR AO CR Ro 7 13 7 CH 1 and CH 2 VAR VOLTS DIV Range ooo om 7 33 8 Low Frequency Linearity o oooooocnnrrcnrss 7 14 9 CH 1 and CH 2 Vertical Deflection Accuracy 7 15 10 CH 3 and CH 4 Vertical Deflection Accuracy 7 16 11 ADD Mode and CH 2 INVERT Deflection Accuracy 7 17 12 Vertical POSITION Range all channels 00 7 18 13 CH 1 to CH 2 Signal Delay Match ooooooocoono o 7 19 14 CH 1 to CH 4 Signal Delay Match 6 ren 7 20 15 CH 3 to CH 4 Signal Delay Match o 7 20 16 CH 1 and CH 2 Vertical Bandwidth o 7 21 17 CH 3 and CH 4 Vertical Bandwidth ea 7 22 18 SCOPE BW Bandwidth Limit Accuracy 5 7 22 19 Common Mode Rejection Ratio 7
103. ocedure iii ile a EE 12 Vertical POSITION Range all channels A Set A SEC DIV 0 1 ms VERTICAL MODE CH 1 ADD off CH 1 VOLTS DIV tv CH 2 INVERT Off SCOPE BW Off CH 1 and CH 2 input COUPLING AC Connect leveled sine wave generator SG 503 output to the CH 1 and CH 2 inputs via a 50 Q BNC coaxial cable a 50 O BNC termination and a BNC dual input coupler Position trace to center horizontal graticuie line Set leveled sine wave generator output for two division signal at 50 kHz Set CH 1 VOLTS DIV 0 1V CH 1 POSITION Fully CW clockwise CHECK that the bottom of the waveform is at least one division above the center horizontai graticule line Set CH 1 POSITION fully CCW CHECK that the top of the waveform Is at least one division below the center horizontal graticule line Set CH 1 POSITION 12 o clock VERTICAL MODE CH 2 CH 1 off CH 2 POSITION Fully CW CHECK that the bottom of the waveform is at least one division above the center horizontal graticule line Set CH 2 POSITION fully CCW CHECK that the top of the waveform is at least one division below the center horizontal graticule line 7 18 2245A Operators 13 a Performance Check Procedure Set CH 2 POSITION to 12 o clock Move the BNC dual input coupler from the CH 1 and CH 2 Inputs to the CH 3 and CH 4 inputs Set VERTICAL MODE CH 3 CH 2 off CH 3 and CH 4 VOLTS DIV 0 1 V CH 3 POSITION Fully CW CHECK
104. ocedure shows how to eliminate an unwanted ac input power frequency signal component from the displayed signal a Perform the initial Setup in OPERATOR CHECKS AND ADJUST MENTS Section 4 but do not apply any signals and center the baseline trace vertically b Apply the signal of interest containing the unwanted line frequency component to the CH 1 input connector C Apply a line frequency signal to the CH 2 input connector To maximize cancellation the signal applied to the CH 2 input must be in phase with the frequency component to be canceled from the CH 1 signal d Select CH 1 and CH 2 Vertical MODE e Set Trigger SOURCE switch to VERT f Set both VOLTS DIV switches to produce displays of about two or three divisions in amplitude g Adjust the CH 2 VOLTS DIV switch and VAR control so that the CH 2 display is about the same amplitude as the component to be canceled in the CH i waveform see Figure 5 74 h Select both ADD and CH 2 INVERT Turn off the CH 1 and CH 2 dis plays and slightly readjust the CH 2 VOLTS DIV VAR control for maxi mum cancellation of the line frequency component see Figure 5 7B i The SEC DIV setting may be set to a faster sweep speed to expand the waveform and the display amplitude may be increased by advancing both VOLTS DIV switches and readjusting the VOLTS DIV VAR con trols as necessary to maintain cancellation of the undesired signal component 2245A Operators 5 15 Basic App
105. omatically readjusted Set X10 MAG On for 2 ns div sweep speed CHECK that the leading edges of the two waveforms have less than 0 4 horizontal division separation at the center graticule line excluding trace width CH 1 to CH 4 Signal Delay Match Set VERTICAL MODE to CH 1 and CH 4 CH 2 off Move the CH 2 signal to the CH 4 input connector vi Superimpose the CH 4 waveform on the CH 1 waveform CHECK that the leading edges of the two waveforms have less than 0 1 horizontal division separation at the center graticuie line exciuding trace width 15 CH 3 to CH 4 Signal Delay Match Za Set VERTICAL MODE CH 3 and CH 4 CH 1 off TRIGGER SOURCE CH 2 Move the CH 3 signal to the CH 2 input and the CH 1 trigger signal to the CH 3 input 20 2245A Operators 16 a Performance Check Procedure Superimpose CH 3 and CH 4 waveforms at the center graticule line CHECK that the leading edges of the two waveforms have less than 0 1 horizontal division separation at the center graticule line Disconnect the test setup CH 1 and CH 2 Vertical Bandwidth Set X10 MAG Off VERTICAL MODE CH 1 CH 3 and CH 4 off SEC DIV 0 1 ms CH 1 VOLTS DIV 5 mV CH 1 and CH 2 input COUPLING DC TRIGGER SOURCE VEHT Horizontal POSITION 12 o clock Connect leveled sine wave generator SG 503 output to the CH 1 in put via a 50 Q precision BNC coaxial cable and a 50 Q BNC termina tion Set the leveled sine wave Generato
106. on insert this piug into a power source outlet that has a properly grounded protective ground contact i Plug Line Reference Option Configuration Usage Voltage Standards AL Qo MOTTO ANSI C73 11 en American NEMA 5 15 P Standard 1 120V IEC 83 15A Universal Euro CEE 7 ILIV VII 240V EC 83 10 16A UK 1363 240V 240v i 13A Australian 240V 10A AS C112 North American 240V 15A ANSI C73 20 NEMA 6 15 P EC 83 Switzerland 220V 6A Abbreviations ANSI American Nationai Standards institute AS Standards Association of Australia BS British Standards institution CEE international Commission on Rules for the Approval of Electrical Equipment IEC international Electrotechnical Commission NEMA National Electrical Manufacturer s Association SEV Schweizevischer Elektrotechischer Verein 2931 21 6558 02 Figure 1 2 Optional power cords 2245A Operators 1 5 Introduction Instrument Cooling To prevent instrument damage from overheated components make sure the Internal alrflow Is not blocked Before turning on the power check that the ventilation holes on the bottom and side of the cabinet are not covered Start Up At power on the instrument does a self diagnostic check If the instrument does not turn on and operate normally turn power off then on again If the
107. ound con nectlon banana jack between the equipment under test and the 22454 Channel 3 and Channel 4 POSITION Controis Adiust vertical po sition of Channel 3 and Channel 4 signal displays 22 Channel 3 and Channel 4 VOLTS DIV Switches Select two basic deflection factors for Channel 3 and Channel 4 0 5 voit division but ton 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 23 CH 3 and CH 4 input Connectors Connect signals to the inputs of the Channel 3 and Channel 4 vertical attenuators Input coupiing is dc only The input connectors are BNC with probe coding ring contacts the same as Channei 1 and Channel 2 The limited choice of deflection factors for the Channel 3 and Channel 4 inputs makes them useful for digital and trigger signals Horizontal Refer to Figure 2 4 for location of items 24 through 31 POSITION Control Adjusts the horizontal position of the waveform displays on the crt X10 MAG Switch Magnifies the A and B sweeps by a factor of 10 and extends the fastest sweep speed to 2 ns per division The center portion of an unmagnified sweep display will be within 0 5 division of the center of a magnified sweep display No action occurs in X Y mode When X10 MAG is on a X10 symbol is displayed next to the SEC DIV readouts The readouts reflect corre
108. perators Performance Characteristics 18 6 in 472 mm un fm mn 18 3 in z 465 mm 2 0 in vetro 51 mm CLEARANCE RECOMMENDED AT REAR AND SIDES FOR COOLING AND INSTRUMENT CONNECTIONS 16 8 in 427 mm FRONT VIEW 8558 25 Figure 6 3 Dimensional drawing rackmount cabinet 2240F1R 2245A Operators 6 19 ee Kernen ES tmt rr A 7 PR Pe d Certificate of the Manufacturer importer We hereby certify that the 2245A OSCILLOSCOPE AND ALL INSTALLED OPTIONS complies with the RF Interference Suppression requirements of Amtsbi Vfg 1046 1984 The German Postal Service was notified that the equipment is being marketed The German Postal Service has the right to re test the series and to verify that it complies TEKTRONIX Bescheinigung des Herstellers Importeurs Hiermit wird bescheinigt da der die das 2245A OSCILLOSCOPE AND ALL INSTALLED OPTIONS in bereinstimmung mit den Bestimmungen der Amtsbiatt Verfugiing 1046 1984 funkentstort ist Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates angezeigt und die Berechtigung zur Uberpruf ng der Serie auf Einhalten der Bestimmungen eingeraumt TEKTRONIX NOTICE to the user operator The German Postal Service requires that Systems assembled by the operator user of this instrument must also comply with Postal Regulation Vfg 1046 1984 Par 2 Sect 1 HINWEIS fur den Benutzer Betreiber
109. position the independent 3j cursor to the more positive point on the waveform Read the voltage difference Time Measurement Cursors Time measurement cursors may be used on any of the input waveforms only in the A Horizontal MODE Time measurements are also availabie in ALT and B Horizontal MODE see Time Delay Measurement in this section Time Difference Use the following procedure steps as a guideline in making time difference measurements using the TIME cursors As with the voltage cursors the OR DELAY control positions both cursors together and the contro positions the independent deita time cursor 1 Apply the signal to the input connector s NOTE Make sure that the signal used as the trigger source is con nected to the lowest numbered channel that will be turned on 2245A Operators 5 3 Basic Applications 2 Set Vertical MODE As desired Horizontai MODE A 3 Press AUTO SETUP button 4 Adjust the VOLTS DIV control so that the measurement points can be easily seen 5 Select a SEC DIV setting that provides the fewest number of cycles of the applied waveform necessary to display the measurement points of interest This is to improve the accuracy of cursor placement for the measurement 6 Press the TIME button to display the time cursors NOTE The independent cursor cannot be positioned in front of the reference cursor t OR DELAY 7 Use the l OR DELAY control to position the
110. r SG 503 output for a six division sig nal amplitude at 50 KHz Increase the leveled sine wave generator output frequency using the Frequency Hange and Frequency Variable controls until a signal display ampiitude of 4 2 divisions is obtained 7 22 2245A Operators 19 a Performance Check Procedure CHECK that the sine wave generator output frequency is between 17 MHZ and 23 MHZ Disconnect the test setup Common Mode Rejection Ratio Connect leveled sine wave generator SG 503 output to the CH 1 and CH 2 input connectors via a 50 precision BNC coaxial cable a 50 2 BNC termination and a BNC duai input coupler Set the leveled sine wave generator output for an eight division signal dispiay amplitude at 50 kHz Set VERTICAL MODE ADD CH 1 off CH 2 VOLTS DIV 10 mV CH 2 INVERT On SCOPE BW Off Adjust CH 1 or CH 2 VAR VOLTS DIV as needed for smallest signal amplitude Set the ieveled sine wave output frequency to 50 MHz Set the VERTICAL MODE to CH 1 ADD off Set the leveled sine wave output amplitude for an elght division dis play Set the VERTICAL MODE to ADD CH 1 off CHECK the signal is less than 0 8 division in amplitude Disconnect the test setup 2245A Operators 7 23 Performance Check Procedure 20 Channel isolation a Set CH 1 and CH 2 VERTICAL MODE On ADD off CH 2 INVERT Off CH 1 CH 2 CH 3 and CH 4 VOLTS DIV 0 1 V TRIGGER SOURCE CH 1 Connect the leveled si
111. r MODE is NOT RUNS AFTER the displayed error message is USE RUNS AFTER DELAY TRIG MODE Measurements in Single Sequence Mode All cursor measurements run continuously during SGL SEQ Trigger MODE The readout and or cursors are displayed briefly during singie sequence mode for making a photographic record or they may be configured to re main on see the discussion on Configure Menu in the SERVICE MENU FEATURES part of this section The displayed readout is the value of the measurement at the instant it s displayed B Trigger AUTO LEVEL acquisitions do not occur when the A Trigger MODE is SGL SEQ 3 8 2245A Operators Operators Familiarization Service Menu Features Most of the items In the SERVICE MENU are for diagnostics troubleshoot ing and calibration However there are three menu selections that are also for operational use CONFIGURE SELF CAL MEASUREMENTS and MAKE FACTORY SETTINGS Press the CH 1 and CHOP ALT Vertical MODE buttons at the same time to display the SERVICE MENU as shown in Figure 3 3 Menu selections are made using VERTICAL MODE buttons that correspond to the menu prompts appearing at the right side of the crt dis play A menu selection underline appears under the SERVICE MENU heading Pressing the ADD button down arrow moves the underline down the CH 1 button up arrow moves the underline up Once the desired item is underlined select RUN CH 2 button to start the selected process Selec
112. r output for a six division signal amplitude at 50 kHz Set the generator Frequency Range and Frequency Variable controls for a 90 MHz output signal CHECK the displayed signal amplitude Is 4 2 divisions or more as the frequency is increased to 100 MHz Repeat the frequency setup and CHECK procedure for VOLTS DIV settings of 50 mV through 0 5 V Move the test signal to the CH 2 input Set VERTICAL MODE CH 2 CH 1 off CH 2 VOLTS DIV 5 mV Repeat the complete Bandwidth check procedure for Channel 2 2245A Operators 7 21 Performance Check Procedure 17 CH 3 and CH 4 Vertical Bandwidth a Set VERTICAL MODE CH 3 CH 2 off CH 3 and CH 4 VOLTS DIV 0 1V b Connect leveied sine wave generator SG 503 output to the CH 3 in 18 put via a 50 2 precision BNC coaxial cable and a 50 11 BNC termina tion Set the generator output for a six division signal dispiay at 50 KHz Set the generator Freguency Range and Frequency Variabie controls for a 90 MHz output frequency CHECK that the signal display amplitude is 4 2 divisions or more as the frequency is increased to 100 MHz Repeat the procedure for 0 5 VOLTS DIV setting Move the test signai to the CH 4 input Set VERTICAL MODE to CH 4 Repeat the procedure for CH 4 SCOPE BW Bandwidth Limit Accuracy Set VERTICAL MODE CH 1 CH 4 off CH i VOLTS DIV 10 mV SCOPE BW On Move test signal from the CH 4 input to the CH 1 input Set leveied sine wave generato
113. r the active measurement that measurement will be canceled without a mes sage being displayed Returning to a mode that may be used and pressing the measurement button will restore the canceled measurement mode See Table 3 1 for compatible and incompatible modes Fable 3 1 Behavior for Horizontal MODE Changes Measurement Compatibie Incompatibie Mode Horizontal Horizontal Modes Modes CURSOR VOLTS A X Y ALT B TIME and 1 TIME A ALT B X Y 2245A Operators 3 7 Operators Familiarization Measurement Compatibility and Error Messages CURSORS VOLTS measurements cannot occur when the VOLTS DIV VAR control for the channel being measured is not in the detent position The displayed error message is MEAS SOURCE VAR OUT OF DETENT TIME and 1 TIME measurements cannot occur when the SEC DIV VAR control is out of the detent position The displayed error message is VAR SECS DIV OUT OF DETENT When in ALT or B Horizontal MODE and the B Trigger MODE is not RUNS AFTER a greater then symboi gt will appear before the delay time readout The readout value displayed is the delay time between the trig ger and the time a B trigger can be accepted by the trigger system question mark will appear in front of the delay time readout for delay measurements when the DELAY time is set to 0 25 division or less from the beginning of the sweep lf a time measurement is selected when in ALT or B Horizontal MODE and the B Trigge
114. re LY OPERATORS 7 070 6558 01 iv MANUAL eS Product Group 46 Please Check for CHANGE INFORMATION at the Rear of This Manual First Printing JAN 1989 AR MIESO JUN 1989 Taker TE Pi M COMMIT TED TO EXCELLENCE Copyright 1987 1889 Tektronix Inc All rights reserved Contents of this publication may not be reproduced in any form without the written permis sion of Tektronix inc Products of Tektronix Inc and its subsidiaries are covered by U S and foreign patents and or pending patents TEKTRONIX TEK SCOPE MOBILE and 157 of Tektronix inc are registered trademarks Printed in U S A Specification and price change privileges are reserved INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first number or letter designates the country of manufac ture The last five digits of the serlal number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows 8000000 Tektronix inc Beaverton Oregon U S A G100000 Tektronix Guernsey Ltd Channel Islands E200000 Tektronix United Kingdom Ltd Marlow J300000 Sony Tektronix Japan H 00000 Tektronix Holland NV Heerenveen The Netherlands HK00000 Tektronix inc Hong Kong Power Source This product is intended to operate from a power source that does not ap ply more than
115. reference cursor to the leftmost point on the waveform to be measured Use the gt control to position the independent cursor to the rightmost point to be measured Then read the time difference value In the top line of crt readout Period Measurement This is a time difference measurement Position the TIME cursors to define a full period 1 cycle of the input waveform its value is displayed Use the setup for making time difference measurements as a guideline for making period measurements see Figure 5 2 5 4 2245A Operators Basic Applications PERIOD 6558 17 Figure 5 2 Period measurement Frequency Measurement A frequency measurement is made using the same method as a period measurement the difference is that the 1 TIME measurement mode is selected instead of TIME The measurement value Is displayed in frequency units When the full perlod is defined by positioning the cursors the fre quency of the signal is displayed Use the same front panel setup used for time difference measurement as a guideline for making a frequency measurement with cursors see Figure 5 3 2245A Operators 5 5 Basic Applications FREQUENCY 6558 18 Figure 5 3 Frequency measurement Rise Time Measurements Making rise time or fall time measurements requires some additional signal scaling to use the graticule rise time measurement aids Numbers 0 10 90 and 100 are etched near the left vertical graticule line These numbers
116. rmance accuracies stated in the Performance Characteristics Section 6 let the instrument warm up for 20 minutes and run the SELF CAL MEASUREMENTS routine To run the SELF CAL MEASUREMENTS routine Press the CH 1 and CHOP ALT VERTICAL MODE buttons at the same time to display the SERVICE MENU Underiine and select SELF CAL MEASURE MENTS by pressing the ADD button Press RUN CH 2 button to start tne routine then QUIT CH 4 button to return to the normal oscilloscope mode NOTE Performance accuracies are ensured only when the SELF CAL MEASUREMENTS is done AFTER the 20 minute warmup 2 2245A Operators Item and Description Leveled Sine Wave Generator Calibration Generator Time Mark Generator Function Generator Performance Check Procedure Table 7 1 Test Equipment Required Minimum Specification Use Frequency 250 Vertical horij kHz to above 150 zontal trigger MHz Output am ing measure piltude variable ment bandwidth from 10 mV to and Z Axis 5 V p p Output checks and impedance 50 Q adjustments Amplitude accuracy con stant within 1 5 of reference frequency to 100 MHz Standard amplitude signal leveis Dc and Square wave 5 mV to 50 Y Accuraoy 0 25 High ampiltude signal levels 1 V to 60 V Repetition rate 1 kHz Fast rise signal level 1 V Repe tition rate 1 MHz Rise time 1 ns or less Flatness 10 5 Marker outputs 5 ns to 0 5 s Marker accura
117. sion display ampli tude at 100 MHz CHECK that the display is stably triggered with NOISE REJ Trigger CPLG but is not triggered with HF REJ Trigger CPLG Set leveled sine wave generator output for a 0 5 division display ampli tude at 100 MHz CHECK that the display is not triggered in NOISE REJ Trigger CPLG Set TRIGGER CPLG DC Horizontal MODE B A B SELECT B Trigger Repeat 100 MHz NOISE REJ Trigger CPLG procedure for the B Trigger Single Sweep Mode Set Horizontal MODE A A SEC DIV 10 us A B SELECT A Trigger 7 32 2245A Operators Performance Check Procedure b Remove the 10X BNC attenuator from the test signal path C Set leveled sine wave generator output to produce a 7 0 division dis play amplitude at 50 kHz d Adda 10X and a 2X BNC attenuator before the 50 Q BNC termination Display should stably trigger with AUTO LEVEL finding the correct trigger level setting e Set A TRIGGER MODE NORM CH 1 Input COUPLING GND TRIGGER MODE SGL SEQ f CHECK that the Trigger READY LED turns on and remains on d Set A INTEN 3 4 fully CW CH 1 Input COUPLING DC see CHECK below h CHECK that the TRIG D LED flashes and the READY LED turns off after a single sweep and readout display occurs when the Input COU PLING switches to DC 6 Trigger LEVEL Contro Range a Set TRIGGER MODE AUTO not AUTO LEVEL TRIGGER LEVEL Fully CCW A INTEN For a good viewing intensity b Remove 10X and 2X B
118. sors will only track together as long as the reference delay plus the delta delay is less than 10 times the A SECIDIV setting 10 horizontal graticule divi sions The cursors cannot be positioned left of the 1st or right of the 11th vertical graticule lines fe OR DELAY This contro has the following functions 1 Positions the reference and delta cursors together in the CURSOR VOLTS 1 TIME or TIME measurement mode when the Horizontal MODE Is A also X Y for CURSOR VOLTS 2 10 2245A Operators Controls Connectors and Indicators 2 Positlons the reference and delta delays together in the 1 TIME or TIME measurement mode when the Horizontal MODE is ALT or A 3 Sets the B sweep delay time in the DELAY measurement mode when the Horizontal MODE is ALT or B This control has the following functions 1 Positions the delta cursor in the CURSOR VOLTS 1 TIME or TIME measurement mode when the Horizontal MODE is A also X Y for CURSOR VOLTS 2 Sets the B sweep delta delay in the 1 TIME or TIME measure ment mode when the Horizontal MODE is ALT or B UNCAL Indicator Lights when the A AND B SEC DIV settings are uncalibrated variable function in effect TRACE SEP Control Positions the B sweep trace verticaily with re spect to the A sweep trace when ALT Horizontal MODE is selected Trigger Refer to Figure 2 5 for location of items 32 through 38 A B SELECT Button Directs the MODE SOURCE CPLG SLOPE and LEV
119. splay the reference waveform with about five divisions of amplitude Vertically center the waveform Set the A SEC DIV setting in A Horizontal MODE to display at least one complete reference waveform period and no more than two if pos sible An excessive number of cycles of the reference waveform in the display reduces the ability to make an accurate reference setting Select or AL SLOPE to position the waveform correctly within the graticuie area for ease in measurement when viewing a single cycle of the reference signal Press the TIME button to display time cursors Position the first vertical cursor to the point where the reference waveform crosses the center horizontal graticule line in the positive di rection see Figure 5 5A The Horizontal POSITION control may be used as necessary to center the waveform period in the viewing area Position the deita cursor to the second positive crossing of the center horizontal graticule line by the reference waveform as shown in Figure 5 5A Note the time readout at the top of the graticule This ls the 360 reference time Apply the phase shifted sine wave signal to be measured to the CH 2 input connector using a 10X probe and turn CH 2 Vertical MODE on to display the signal 2245A Operators 5 9 Basic Applications NEIN gt MINI IT NEM CINI A a 6558 20 Figure 5 5 Phase difference measurement 5 10 2245A Operators Basic App
120. t Quit CH 4 button to exit the SERVICE MENU and return to the normai oscilloscope operation SERVICE MENU DIAGNOSE CONF IGURE SELF CAL MEASUREMENTS INTERNAL SETTINGS MENU EXERCISER MENU 6558 12 Figure 3 3 Service Menu 2245A Operators 3 9 Operators Familiarization Configure Menu The CONFIGURE item allows you to select whether or not to keep the readout on in the single sequence trigger mode Select CONFIGURE from the SERVICE MENU and answer YES or NO to each of the displayed questions Either YES or NO will be underlined to indi cate how the instrument is presently configured After YES or NO is se lected the next configuration choice Is displayed After answering the last question the SERVICE MENU dispiay returns To exit from the CONFIG URE menu without answerlng the remaining question s press the END button or the CLEAR DISPLAY button The CONFIGURE items are listed as foliows NOTE instruments Serial Numbered BO20099 or below only have one menu item in CONFIGURE KEEP MENU ON WHEN MEAS MT SELECTED KEEP MENU ON WHEN MEAS MT SELECTED Factory Settings de fault is NO Selecting NO clears the measurement menu items from the display after a measurement function is selected Measurement cursors remain displayed The AUTO TRACKING MENU remains on after a selec tion has been made Selecting YES allows a measurement menu to remain displayed after a function is selected The measurement menu items can b
121. th the A and B SEC DIV VAR control in the detent fully clockwise position The A SEC DIV switch setting is set only from the A Horizontal MODE and the B SEC DIV switch is set only from the ALT or B Horizontal MODE 2245A Operators 2 9 Controls Connectors and Indicators NOTE The B sweep speed can never be slower than the A sweep speed When the two sweep speeds are the same they are locked At this point A will follow B to slower SECIDIV settings in ALT or B and B will follow A to faster settings in A A SEC DIV The calibrated A sweep speed is selected only in A Hori zontal MODE from 0 5 s per division to 20 ns per division X10 MAG off B SEC DIV The calibrated B sweep speed is selected either in ALT or B Horizontal MODE from 5 ms per division to 20 ns per division X10 MAG off A and B SEC DIV VAR Control Provides continuously variable un calibrated A and B sweep speeds to at least 2 5 times slower than the calibrated 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 gt is displayed before each SEC DIV readout value when the sweep speeds are greater than the SEC DIV settings The SEC DIV settings are calibrated when the VAR control is in the fully clockwise detent position CURSORS TIME POSITION Controls Set the reference and delta cursors on the display NOTE The reference and delta cur
122. this Manual CAUTION statements identify conditions or practices that could result in damage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life Terms as Marked on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the markings or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking Symbols in this Manual This symbol indicates where applicable A cautionary or other information is to be found For maximum input voltage see Table 6 1 Symbols as Marked on Equipment y DANGER High voltage amp Protective ground earth terminal ATTENTION Refer to manual vili 2245A Operators 2245A Operators em tte Mt Performance Check Procedure INTRODUCTION This Performance Check Procedure verifies the Performance Requirements of the 2245A as listed in the Performance Characteristics Section 6 and helps determine the need for readjustment These checks may also be Used as an acceptance test or as a preliminary troubleshooting aid You do not have to remove the wrap around cabinet from the 2245A to do this procedure All checks can be made with controls and connectors ac cessible from the outside Test Equipment Required Table 7 1 lists all the test equipment required to do the
123. tor output for six divisions of horizontal display amplitude at 50 kHz Set leveled sine wave output to 3 MHz CHECK X Axis display is 4 2 horizontal divisions or more Disconnect the test equipment from the 2245A 2245A Operators 7 45 Performance Check Procedure MEASUREMENT CURSORS Equipment Required See Table 7 1 Time mark generator Calibration generator 50 Q BNC coaxial cable 50 Q BNC termination 4 le SEC dI and le 1 SEC gt Cursor Accuracy a Set READOUT intensity For a viewable readout A INTEN For a viewable trace VERTICAL MODE CH 1 CH 1 VOLTS DIV 0 5 V CH 1 and CH 2 input COUPLING DC CH 2 INVERT Off SCOPE BW Off Horizontal MODE A A SEC DIV ims A B SELECT A Trigger TRIGGER MODE AUTO LEVEL TRIGGER CPLG DC TRIGGER SOURCE VERT TRIGGER SLOPE positive going TRIGGER HOLDOFF Min FOCUS For best defined display b Connect time mark generator TG 501 output via a 50 2 BNC coaxial cable and a 50 BNC termination to the CH 1 input c Set time mark generator for 1 ms time marks d Position first time marker horizontally to the first vertical graticule line left most edge of the graticule e Press TIME MEASUREMENTS button to display the je SEC I cursors f Position the reference cursor to the second time marker and the delta cursor to the tenth time marker 7 46 2245A Operators Performance Check Procedure CHECK that the readout is 7 940 ms to 8 060 ms Press the 1 TIME MEASU
124. ts of the National Safe Transit Association test procedure 1A B 1 excursion of 1 inch p p at 4 63 Hz 1 1 g for 30 minutes on the bottom and 30 minutes on the side for a total of 60 minutes Meets the limits of the National Safe Transit Association test procedure 1A B 2 10 drops of 36 inches 2245A Operators Performance Characteristics Table 6 3 Mechanical Characteristics CHARACTERISTICS DESCRIPTION STANDARD INSTRUMENT Weight with Front Cover Accessories and Accessories Pouch without manual with Power Cord Shipping Weight Domestic Overall Dimensions Height With Feet and Accessories Pouch empty Without Accessories Pouch Width with handie Depth With Front Cover on With Handie Extended Cooling Finish Construction 22454 Operators 8 9 kg 19 5 Ib 7 9 kg 17 3 Ib 11 7 kg 25 8 io See Figure 6 2 dimensional outline drawing Approx 176 5 mm 6 95 in 163 6 mm 8 44 in 360 4 mm 14 19 in 445 3 mm 17 53 in 518 9 mm 20 43 in Forced air circulation no air filter Tek Blue pebble grain finish painted on aluminum cabinet Aluminum alloy chassis Plastic laminate front panel 6 15 Performance Characteristics Table 6 3 cont Mechanica Characteristics CHARACTERISTICS DESCRIPTION emee e RACKMOUNT INSTRUMENT Weight With Power Cord 10 0 kg 22 0 ib Shipping Weight Domestic includes 14 2 kg 31 3 ib m
125. uto setup action for each front panel control is shown in Appendix A MIN SETUP MIN SETUP is only avaliable on instrUments Serial Num bered BO20100 or above Pressing and holding the Auto Setup button until the instrument returns to normal operation initiates the MIN SETUP function This automatically sets up the front pane controls but leaves many of the controls unchanged from what the user has set MIN SETUP action for each front panel control is whown in Appendix A MEASUREMENT SYSTEM The 2245A has a highly accurate voltage and time measurement system Voltage or time is measured between two cursors or intensified zones for time measurements in the ALT or B Horizontal MODE that can be posi tioned as desired to two points on the waveform Cursor Volts Measurements Press CURSOR VOLTS to display the voitage measurement cursors and activate the voltage measurement system The measured value is dis played at the top of the screen NOTE Changing the Horizontal MODE will remove the volts cur sors from the display Set Horizontal MODE back to A or X Y and press the CURSOR VOLTS button to redisplay the cursors 2245A Operators 3 5 Operators Familiarization The voltage measurement system measures the equivalent voltage differ ence between two horizontal cursors when the Horizontal MODE Is in A or X Y Both cursors are positioned by the fe OR DELAY control and the delta cursor is positioned by the control When the
126. w level setting NORM Triggers the A sweep when the A Trigger LEVEL control is set within the peak to peak limits of an adequate trigger signal When the sweep is not triggered no baseline trace is displayed 2245A Operators 2 13 Controls Connectors and indicators TV LINE Starts the A sweep at the beginning of a video signal line SLOPE polarity must match the composite sync polarity i e SC SLOPE for negative sync to obtain TV LINE triggering on the horizon tal sync pulse Instruments Serial Numbered 8020100 or above can have the TV SLOPE polarity preset by changing the instrument con figuration from the CONFIGURE menu see Service Menu Features in Section 3 TV FIELD Starts the A sweep at the beginning of a video signal field SLOPE polarity must match the composite sync polarity to obtain TV FIELD triggering SGL SEQ Single Sequence Sets up the A sweep for single se quence operation 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 trig gering level changes only when the TRIGGER LEVEL control is ad justed 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 ZONTAL MODE switches Each displayed sweep in the sequence re quires a distinct A sweep triggering event The READY light rema
127. yed waveform To maintain original frequency characteristics of the input sig nal use oniy high quality low loss coaxial cables Coaxial cables must be terminated at both ends in their characteristic impedance to prevent signal reflections within the cable Use suitable impedance matching devices External Triggering Any of the four vertical channels in the 2245A 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 displayed signals you can use any free vertical input channel CH 1 and CH 2 can condition a wide range of signals to produce triggers over the full vertical deflection range from millivoits to hundreds of volts CH 3 and CH 4 have two basic attenuation factors 0 1 and 0 5 voits division making them especially useful for triggering on and viewing digital signal levels 3 4 2245A Operators Operators Familiarization Auto Setup Pressing the AUTO SETUP button automatically sets up the front panel controls based on the characteristics of the applied signal The voltage am plitude sweep settings trigger parameters vertical and horizontai posi tioning and trace intensities are preset to produce a usable waveform dis play The waveform is horizontally centered and vertically positioned within the crt display The voltage and frequency characteristics of the input sig nai must be within the limits of the 2245A specifications given in Section 6 A

Tektronix 2245A User's Manual

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