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Tektronix TAS 200, Instruction Manual

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Tektronix TAS 200 Instruction Manual Download Page 31

TAS 200 Series Adjustment Procedures

Bench Test Instruments and Handheld Oscilloscopes Basic Service

27

Power Supply Adjustments

To locate the adjustments and test points for the following procedures, refer to
Figure 7. The Power and High Voltage board occupies the bottom-left side of the
instrument below the CRT.

NOTE

. The power supply section affects all other sections of the instrument. If

you make repairs or adjustments that change the absolute value of any power
supply voltage, you must complete the entire adjustment procedure.

WARNING.

Use extreme caution when adjusting the power supply. The high

voltages present can cause a fatal injury.

Instrument

front

Test points

ASTIG
VR604

SUB INTENSITY

VR603

SUB FOCUS

VR602

+12V ADJ

VR601

+12V

FREQ ADJ
VR701

Figure 7: Power and High Voltage board (viewed from the instrument bottom)

Use the following procedure to adjust the

+

12 V power supply.

1.

On the Power and High Voltage board, connect the voltmeter common lead
to the oscilloscope chassis ground and the measurement lead to the +12 V
test point. See Figure 7 for the test point location.

2.

Verify that the voltmeter reads b11.95 and +12.05 V. If the reading
is within these limits, go to step 4.

3.

Adjust VR601 for a voltmeter reading of +12 V. See Figure 7 for the
adjustment location.

+12 V Supply

Summary of Contents for TAS 200

Page 1: ...Instructions Manual TAS 200 Series Oscilloscopes 070 9855 01 www tektronix com ...

Page 2: ......

Page 3: ...rification 7 Test Equipment 8 Set Up 9 Vertical Check 10 Horizontal Check 15 Trigger Check 17 Cursor Check 19 TAS 200 Series Adjustment Procedures 21 List of Adjustments 21 Test Equipment 23 Preparation for Adjustment 24 Power Supply Adjustments 27 Vertical Adjustments 30 Horizontal Adjustments 37 Trigger Adjustments 40 Probe Compensation 42 Cursors and Readout Adjustments 43 ...

Page 4: ...Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service ...

Page 5: ...lowing features H High beam transmission and high intensity CRT displays for clear waveforms at high sweep speeds H High stability low drift temperature compensation circuits to reduce baseline and DC balance drift H Trigger feature Set to 50 that eliminates triggering adjustments when displaying regular video and large duty cycle ratio signals H Synchronization separator and trigger circuitry tha...

Page 6: ...TAS 200 Series Oscilloscopes 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service ...

Page 7: ...ss than 1 kHz Table 1 Vertical deflection characteristics Characteristic TAS 220 description TAS 250 description Frequency Bandwidth 3 dB DC to 20 MHz 5 mV div to 5 V div at 5 to 35 C DC to 50 MHz at 0 to 10 C and 35 to 40 C DC to 15 MHz DC to 40 MHz at 0 to 5 C and 35 to 40 C DC to 10 MHz 1mV div to 2 mV div DC to 15 MHz Vertical Gain 15 to 35 C 5 mV div to 5 V div 3 1 mV div to 2 mV div 5 Variab...

Page 8: ... 1 Signal Output Typical 100 mV div open circuit 50 mV div into 50 Ω CH 2 INV Balance Typical 1 division balanced point variation Table 2 Horizontal characteristics TAS 200 series Characteristic Description Standard Sweep Time Accuracy 15 to 35 C 3 0 to 15 C and 35 to 40 C 4 Magnified Sweep Time Accuracy 1 s div to 0 5 sec div 5 0 1 to 0 5 s div 8 Sweep Linearity Standard 3 X10 MAG 5 X10 MAG 0 1 t...

Page 9: ...Characteristic Description Maximum Input Voltage 50 V DC peak AC Sensitivity 3 Vp p Trace becomes brighter with negative input Frequency Bandwidth DC to 5 MHz Input Resistance 5 kΩ Table 6 Typical X Y mode operation Characteristic TAS 220 description TAS 250 description Sensitivity Same as CH 1 vertical axis Sensitivity Accuracy 5 mV to 5 V div 4 1 to 2 mV div 6 Frequency Bandwidth DC to 1 MHz DC ...

Page 10: ...midity 0 5 Five cycles 120 hours referenced to MIL T 28800D paragraph 4 5 1 2 2 for type III class 5 instruments Operating and nonoperating at 90 0 5 relative humidity Vibration Operating 15 minutes along each of three major axes at a total displacement of 0 015 inch peak to peak 2 4 g at 55 Hz with frequency varied from 10 Hz to 55 Hz to 10 Hz in one minute sweeps Hold for 10 minutes at 55 Hz in ...

Page 11: ...llowing conditions H The instrument operates in a 20_ to 30_ C ambient environment H The oscilloscope warms up for at least 20 minutes H The cabinet remains installed on the oscilloscope The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently Table 11 lists the equipment needed to do the performance verification proce dures Th...

Page 12: ...s Example product Leveled Sine Wave Generator 200 kHz to 250 MHz variable amplitude from 5 mV to 4 Vp p into 50 Ω Wavetek 9100 Universal Calibration System with Oscilloscope Calibration M d l O i Time Mark Generator Variable marker frequency from 10 ms to 10 ns accuracy within 2 ppm y p Module Option 250 Fluke 5500A Multi product Calibrator with DC Calibration Generator DC voltage levels from 100 ...

Page 13: ... to the settings listed below Table 12 Oscilloscope initial settings Control Setting INTENSITY Visible Display CURSOR ON OFF Off VERTICAL POSITION Midrange MODE CH1 VOLTS DIV 10 mV VARIABLE CAL GND In HORIZONTAL SEC DIV 10 ms POSITION Midrange MAG Off Out X Y Off Out SWEEP VARIABLE CAL TRIGGER SLOPE Positive push switch out LEVEL Midrange MODE AUTO SOURCE CH 1 COUPLING DC ...

Page 14: ...to the TAS 200 series oscilloscope CH 1 CH 2 input See Figure 2 below Calibration generator Precision cable Figure 2 Gain and voltage check setup 2 Set up the oscilloscope as follows VERTICAL MODE CH1 CH2 CH 1 CH 2 AC DC DC CH 1 CH 2 VOLTS DIV 1 mV TRIGGER MODE AUTO HORIZONTAL SEC DIV 0 5 ms CH 1 CH 2 GND Out release 3 Set the oscilloscope CH 1 VOLTS DIV Scale and calibration generator output to e...

Page 15: ... 85 to 5 15 div 200 mV 1 V 4 85 to 5 15 div 500 mV 2 V 3 88 to 4 12 div 1 V 5 V 4 85 to 5 15 div 2 V 10 V 4 85 to 5 15 div 5 V 20 V 3 88 to 4 12 div 4 Set the calibration generator output to 5 mV 5 Return the oscilloscope CH 1 CH 2 VOLTS DIV control to 1 mV 6 Rotate the oscilloscope CH 1 CH 2 VERTICAL VARIABLE control counterclockwise off of the CAL position until the amplitude of the displayed wa...

Page 16: ...E CH1 CH2 CH 1 CH 2 AC DC DC CH 1 CH 2 VOLTS DIV 1 mV HORIZONTAL SEC DIV 10 s TRIGGER MODE AUTO TRIGGER COUPLING DC TRIGGER SOURCE CH 1 CH 2 CH 1 CH 2 GND Out release 3 To confirm the bandwidth of the input channel perform the following substeps a through c at the settings and limits noted in Table 14 a Set the oscilloscope CH 1 CH 2 VOLTS DIV control as indicated b Set the leveled sine wave gener...

Page 17: ...0 MHz 50 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 100 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 200 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 500 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 1 V 4 divisions 2 8 divisions 20 MHz 50 MHz 4 Repeat steps 1 through 3 for CH 2 To check DC balance accuracy perform the following steps 1 Set up the oscilloscope as follows VERTICAL MODE CH1 CH2 CH 1 CH 2 G...

Page 18: ...e and the fully counterclockwise positions of the CH 1 VARIABLE control 3 Repeat steps 1 and 2 above for CH 2 To check CH 2 Inverted balance accuracy perform the following steps 1 Set up the oscilloscope as follows VERTICAL MODE CH2 CH 2 GND In 2 Position the oscilloscope trace on the center horizontal graticule line using the CH 2 POSITION control 3 Verify that there is minimal trace shift 1 divi...

Page 19: ...Mark Generator 50 Ω Termination Precision cable Figure 4 Timing check setup 2 Set up the oscilloscope as follows VERTICAL MODE CH1 CH 1 AC DC DC CH 1 VOLTS DIV 0 5 V CH 1 GND Out release HORIZONTAL SEC DIV 1 s TRIGGER MODE AUTO TRIGGER COUPLING DC 3 Set up the time mark generator to produce 0 1 s markers 4 Center the time marks vertically on the oscilloscope display 5 Position the rising edge of t...

Page 20: ... 24 division 1 ms 0 1 ms 0 24 division 2 ms 0 2 ms 0 24 division 5 ms 0 5 ms 0 24 division 1 ms 1 ms 0 24 division 2 ms 2 ms 0 24 division 5 ms 5 ms 0 24 division 7 Set the oscilloscope HORIZONTAL SEC DIV control to either 5 s TAS 220 or 1 s TAS 250 8 Set the oscilloscope HORIZONTAL X10 MAG push switch to the on position in 9 Set the time mark generator to 20 ns 10 Position the edge of the second ...

Page 21: ... position out Trigger Check The following check verifies the trigger accuracy of your oscilloscope 1 Use the 50 Ω precision coaxial cable to connect the output of the leveled sine wave generator to the 50 Ω termination then connect the 50 Ω termination to the TAS 200 series instrument CH 1 input See Figure 5 below Sine Wave Generator Precision Cable 50 Ω Termination Figure 5 Trigger level check se...

Page 22: ...Hz High frequency trigger 1 5 divisions 20 MHz 50 MHz 4 Reduce the leveled sine wave generator output until the minimum trigger waveform amplitude is equal to the value listed in Table 17 If necessary adjust the oscilloscope TRIGGER LEVEL to maintain a stable waveform during the operation 5 Set the leveled sine wave generator for a four division output at the high frequency trigger level listed in...

Page 23: ...ITION switch 6 Toggle the TRACKING O REF push switch to select only the O cursor 7 Position the O cursor 4 divisions to the right of the display vertical center with the CURSOR POSITION switch 8 Verify that the T readout at the top left corner of the display reads between 7 72 and 8 28 ms 9 Set the VERTICAL MODE switch to CH2 and repeat steps 4 through 8 for CH 2 To check cursor V measurement accu...

Page 24: ... Basic Service 6 Position the O cursor 3 divisions below the display horizontal center with the CURSOR POSITION switch 7 Verify that the V1 2 readout at the top left corner of the display reads between 5 78 and 6 22 V 8 Set the VERTICAL MODE switch to CH2 and repeat steps 3 through 7 for CH 2 ...

Page 25: ...tep by step adjustment procedures The procedures in this section do not verify performance To confirm that your oscilloscope meets factory specifications implement the procedures in the TAS 200 Series Performance Verification section List of Adjustments Use the adjustments listed in Table 18 to return TAS 220 and TAS 250 oscillo scopes to factory calibration Table 18 TAS 220 and TAS 250 adjustment...

Page 26: ...S 220 and TAS 250 adjustments cont Horizontal Adjustments X10 Magnification Registration Horizontal Position 1 ms Timing 1 s and 1 s Timing X Gain Accuracy X Axis Offset Trigger Adjustments Trigger DC Offset Trigger Slope Balance Trigger Center Probe Compensation Cursors and Readout Adjustments Cursor Accuracy Drift ...

Page 27: ...4 Vp p into 50 Ω Wavetek 9100 Universal Calibration System with Oscilloscope Calibration M d l O i Time Mark Generator Variable marker frequency from 1 ms to 10 ns accuracy within 2 ppm y p Module Option 250 Fluke 5500A Multi product Calibrator with DC Calibration Generator DC voltage levels from 100 mV to 10 V Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option 5500A SC Digi...

Page 28: ... up the instrument for at least 20 minutes H Do not alter a setting unless a performance characteristic cannot be met at the current setting H Do not alter any setting without reading the entire adjustment procedure first H Read the Safety Summary at the beginning of this manual NOTE Altering the 12 V ADJ setting may require a complete readjustment of the instrument You must remove the instrument ...

Page 29: ... Adjustment Procedures Bench Test Instruments and Handheld Oscilloscopes Basic Service 25 Rear panel mounting screws 4 Rear panel Instrument cover Cover screws 2 Figure 6 TAS 220 and TAS 250 instrument cover removal ...

Page 30: ...e 20 Oscilloscope initial settings Control Setting INTENSITY Visible display CURSOR ON OFF Off VERTICAL CH 1 CH 2 POSITION Midrange MODE CH1 CH2 CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VOLTS DIV VARIABLE CAL CH 1 CH 2 GND In HORIZONTAL POSITION Midrange X10 MAG Out X Y Out SWP UNCAL Out TRIGGER LEVEL Midrange MODE AUTO COUPLING AC SOURCE CH 1 CH 2 SLOPE Rising push switch out Initial Settings ...

Page 31: ...xtreme caution when adjusting the power supply The high voltages present can cause a fatal injury Instrument front Test points ASTIG VR604 SUB INTENSITY VR603 SUB FOCUS VR602 12V ADJ VR601 12V FREQ ADJ VR701 Figure 7 Power and High Voltage board viewed from the instrument bottom Use the following procedure to adjust the 12 V power supply 1 On the Power and High Voltage board connect the voltmeter ...

Page 32: ...ensity 1 Set up the oscilloscope as follows HORIZONTAL SEC DIV 1 ms TRIGGER HOLDOFF NORM 2 Rotate the front panel INTENSITY control to the fully counterclockwise position then rotate the control clockwise to the 90_ nine o clock position 3 Locate VR603 on the Power and High Voltage board see Figure 7 for the adjustment location Adjust VR603 until the trace is barely visible 4 Rotate the INTENSITY ...

Page 33: ...dot to the display center Rotate the INTENSITY control to give the dot a sharp edge 4 Adjust VR604 on the Power and High Voltage board and the oscilloscope front panel FOCUS control until the dot becomes circular See Figure 7 for the adjustment location 5 Set the front panel HORIZONTAL X Y push switch to the out position 6 Repeat steps 1 through 5 for best performance ...

Page 34: ...lowing procedures refer to Figures 8 9 and 10 The Main board occupies the bottom right side of the instrument VR401 VR407 VR206 VR301 VR112 VR110 VR109 VR113 VR104 VR102 VR202 VR204 VR213 VR207 VR210 VR405 VR408 VR502 VR303 VR108 VR103 VR208 VR203 VR404 VC106 VC105 VC205 VC206 Instrument front VR802 VR106 VR107 Figure 8 Main board viewed from the instrument top ...

Page 35: ...ce shift is less than two divisions when switching the VOLTS DIV control between 1 mV and 2 mV 6 Set the VERTICAL MODE to CH2 and repeat steps 2 through 5 for CH 2 Use the following procedure to adjust the variable DC balance 1 Set up the oscilloscope as follows VERTICAL MODE CH1 CH2 CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 GND In 2 On the Main board adjust VR106 VR206 for a mini...

Page 36: ... 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 GND In 2 Position both traces on the center horizontal graticule line using the CH 1 and CH 2 VERTICAL POSITION controls 3 Set the VERTICAL MODE control to the ADD position 4 On the Main board adjust VR301 to position the trace on the center horizontal graticule line See Figure 8 for the adjustment location 5 Set the VERTICAL MODE switch to BOTH CH2 and then...

Page 37: ...Set the VERTICAL MODE to CH2 and repeat steps 2 and 3 for CH 2 Use the following procedure to adjust the high frequency compensation 1 Set up the oscilloscope as follows VERTICAL MODE CH1 CH2 CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 AC DC AC HORIZONTAL SEC DIV 0 2 s 2 Connect a 20 MHz sine wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform four division...

Page 38: ... CH 2 input Adjust the generator output to produce a waveform six divisions in amplitude on the display 10 Increase the frequency to 20 MHz for the TAS 220 or 50 MHz for the TAS 250 Verify that the waveform amplitude exceeds 4 2 divisions at these frequencies 11 Set the oscilloscope CH 1 CH 2 VOLTS DIV to 1 mV and the sine wave generator to 50 kHz Adjust the generator output to produce a waveform ...

Page 39: ... minimal overshoot See Figure 10 for the adjustment locations Instrument front VC101 VC103 VC102 VC104 VC203 VC201 VC202 VC204 1 10 1 100 1 10 1 100 STEP BAT VR101 X AXIS DC OFFSET VR401 TRIG BAL VR403 TRIG CENT VR407 STEP BAT VR201 Figure 10 Main board viewed from the instrument bottom 4 Set the CH 1 CH 2 VOLTS DIV control to 1 V 5 Readjust the generator output to produce a waveform five division...

Page 40: ...orm See Figure 10 for the adjustment locations 16 For each setting of the CH 1 CH 2 VOLTS DIV control adjust the generator output to produce a waveform five divisions in amplitude Evaluate the waveform for optimum symmetry and flatness at each setting 17 Set the VERTICAL MODE to CH2 and repeat steps 2 through 16 for CH 2 Use the following procedure to adjust the channel 1 output DC offset 1 Set up...

Page 41: ...use the HORIZONTAL POSITION control to reposition the trace to the display center 4 Set the HORIZONTAL X10 MAG push switch to the out position Adjust VR502 to position the trace edge to the display vertical center See Figure 8 for the adjustment location 5 Repeat steps 3 and 4 until the trace edge remains within 1 division of the display center when pressing the HORIZONTAL X10 MAG push switch in a...

Page 42: ...TICAL MODE CH1 CH 1 VERTICAL POSITION Midrange HORIZONTAL SEC DIV 1 s HORIZONTAL SWP UNCAL Out 2 Connect the time mark generator to the CH 1 input with a 50 Ω coaxial cable and 50 Ω termination 3 Set up the generator to produce a 1 s output 4 Adjust the generator output to produce a waveform one division in amplitude on the display 5 Adjust VR404 for a one marker per division display See Figure 8 ...

Page 43: ...se the following procedure to adjust the X axis DC offset 1 Set up the oscilloscope as follows CH 1 VERTICAL POSITION Midrange VERTICAL MODE CH1 CH 1 VOLTS DIV 50 mV CH 1 GND In HORIZONTAL SEC DIV 1 ms HORIZONTAL X Y Out TRIGGER MODE AUTO 2 Position the trace vertically to the horizontal center graticule line 3 Position the left edge of the trace horizontally to the first vertical graticule line e...

Page 44: ...CH 2 2 Connect a 50 kHz sine wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform eight divisions in amplitude on the display 3 Rotate the TRIGGER LEVEL control to set the trigger point at the center of the signal swing 4 Alternate the TRIGGER COUPLING control between the AC and DC positions Adjust VR110 VR210 until the oscilloscope triggers at the same amplitude for both ...

Page 45: ...ettings Adjust VR403 for a 0 4 division downward vertical shift at the beginning of the sweep See Figure 10 for the adjustment location Use the following procedure to adjust the trigger center 1 Set up the oscilloscope as follows HORIZONTAL SEC DIV 1 ms TRIGGER SOURCE CH 1 TRIGGER SET TO 50 In CH 1 AC DC AC 2 Connect a 50 kHz sine wave to the CH 1 input Adjust the generator output to produce a wav...

Page 46: ...e board viewed from the instrument bottom 1 Set up the oscilloscope as follows VERTICAL MODE CH1 CH 1 VOLTS DIV 0 5 V CH 1 AC DC DC HORIZONTAL SEC DIV 0 2 ms TRIGGER COUPLING DC TRIGGER SOURCE CH 1 2 Connect the probe to the CH 1 input connector 3 Touch the probe tip to the PROBE COMP tab on the left side of the front panel 4 Adjust the probe compensation for a flat topped square wave on the displ...

Page 47: ...t the cursor accuracy 1 Simultaneously press the front panel PROBE X1 X10 and the V T 1 T push switches to display the cursor calibration square Figure 12 Cursor calibration display 2 On the Control and I O board adjust the following potentiometers to position the alignment square as shown in Figure 12 See Figure 13 for the adjustment locations X Gain VRA01 X Position VRA02 Y Gain VRA03 Y Position...

Page 48: ...e the following procedure to minimize the readout drift 1 If the display readouts are not visible simultaneously press the front panel PROBE X1 X10 and the CURSOR ON OFF push switches 2 While toggling the VERTICAL MODE switch between BOTH and ADD positions adjust VRA05 on the Control and I O board to minimize the character drift 3 Simultaneously press the PROBE X1 X10 and the V T 1 T push switches...

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