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"Bench Test Instruments and Handheld Oscilloscopes Basic Service

1. 3 Adjust VR102 VR202 to obtain a waveform five divisions in amplitude See Figure 8 for the adjustment locations 4 Setthe VERTICAL MODE to CH2 and repeat steps 2 and 3 for CH 2 High Frequency Use the following procedure to adjust the high frequency compensation Compensation Set up the oscilloscope as follows VERTICAL MODE CHI 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 us 2 Connect a 20 MHz sine wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform four divisions in amplitude on the display 3 Adjust VC105 and VC106 VC205 VC206 for maximum waveform amplitude See Figure 8 for the adjustment locations 4 Adjust VR103 VR203 to obtain a maximum waveform amplitude See Figure 8 for the adjustment locations 5 Connect a 1 MHz square wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform six divisions in amplitude on the display 6 Adjust VR302 and VC301 to optimize the waveform flatness See Figure 9 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service 33 TAS 200 Series Adjustment Procedures VC301 3RD COMP amp VR302 Instrument front U Figure 9 Power and High Voltage board viewed from the instrument bottom 10 11 12 13 14 34 Adjust VR107 VR207 to optimize the waveform flatness See Figure 8 for the adjustmen
2. Bench Test Instruments and Handheld Oscilloscopes Basic Service 61 PS2520 and PS2521 Series Adjustment Procedures 9 Enter the DMM reading on the power supply keypad and press The power supply readout will return to normal in approximately 5 seconds The calibration is complete Output 3 Use the following steps to calibrate OUTPUT 3 1 2 3 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Press SHIFT CURRENT W Enter the calibration password on the keypad PS2520 amp PS2520G enter 2520 PS2521 amp PS2521G enter 2521 lt Verify that the power supply readout displays cL00 indicating calibration mode Configure the DMM to measure DC volts autorange Connect the DMM positive and negative leads to the corresponding OUTPUT 3 and terminals Press lt on the power supply keypad Verify that the power supply readout displays cL10 voltage offset calibration Enter the DMM reading on the power supply keypad and press lt 2 Verify that the power supply readout displays cL11 indicating voltage full scale calibration Adjust VR401 for a DMM reading of 6 5 V See Figure 14 for the adjust ment location OO Lj Ho o lt Instrument front Figure 14 VR401 adjustment location 62 Bench Test Instruments and Handheld Oscilloscopes Basic Service P
3. and verify that as you attempt to decrease the current below 0 000 A Err 019 appears on the readouts and the C C indicator lights The current should decrease in 1 ampere steps on the CURRENT A readout Press CURRENT ZA and verify that as you attempt to increase the current past 3 100 A Err 017 appears on the readouts The current should increase in ampere steps on the CURRENT A readout OCP Series and Parallel Mode Indicators Use the following steps to verify OCP series and parallel output indicator function 1 On the power supply front panel press OCP ON OFF to enable the OCP Verify that the OCP indicator lights up on the display Press OCP ON OFF Verify that the OCP indicator turns off Press SHIFT SERIES INDEP to configure the power supply outputs for series operation Verify that the SERIES indicator lights up on the display Press SHIFT PARA INDEP to configure the power supply outputs for parallel operation Verify that the PARA indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service 11 PS2520 and PS2521 Series Performance Verification 12 Voltage Set Accuracy 5 Press SHIFT PARA INDEP again to reconfigure the outputs for indepen dent operation Verify that the PARA and SERIES indicators turn off Set GPIB Use the following steps to check the GPIB address 1 2 3 Press LOCAL
4. DC Balance Shift Typical 5 mV div to 5 V div 0 5 divisions 1 mV div to 2 mV div 2 0 divisions Bench Test Instruments and Handheld Oscilloscopes Basic Service 3 TAS 200 Series Specifications Table 1 Vertical deflection characteristics cont Characteristic TAS 220 description TAS 250 description Chopping Repetition Frequency Typical 250 kHz Maximum Input Voltage 400 V DC peak AC Channel Isolation Typical 50 kHz 1000 1 10 MHz 100 1 CH 1 Signal Output Typical 100 mV div open circuit 50 mV div into 50 Q CH 2 INV Balance Typical lt 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 us div to 0 5 sec div 5 0 1 to 0 5 us div 8 Sweep Linearity Standard 3 X10 MAG 5 X10 MAG 0 1 to 0 5 ps div 8 Table 3 Readout characteristics TAS 200 series Characteristic Description Readout Resolution 1 25 div Readout Accuracy 3 1 25 div Readout Modes AV AT 1 AT Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Specifications Table 4 Trigger characteristics Characteristic TAS 220 description TAS 250 performance description Sensitivity 0 5 divisions internal 0 1 V external DC to 5 MHz DC to 10 MHz 1 5 divisions internal 0 2 V external 5 t
5. Preparation for Adjustment 56 Perform the adjustment procedures on an as needed basis If a power supply section fails a performance requirement or if a section is replaced or repaired adjust only that section Adjusting individual sections of the instrument rarely affects its total performance The following guidelines apply to all adjustments m Verify that the line voltage selector instrument rear is set to the correct voltage If you must change the selector setting disconnect the AC power before altering the setting m Remove the instrument cover for the voltage full scale calibrations only m Plug in and warm up the instrument for at least ten minutes A thirty minute warm up period is required if the instrument has been exposed to a high hu midity or high condensing environment Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Adjustment Procedures m Perform the adjustments in a 22 to 24 C 71 to 75 F ambient environ ment with a relative humidity of 75 or less M Do not alter any setting unless a performance characteristic cannot be met at the current setting M Do not alter any setting without reading the entire adjustment procedure first m Read the Safety Summary at the beginning of this manual before proceeding Remove Instrument Cover You must remove the instrument cover to make internal adjustments WARNING To avoid electrical shock disconnect the
6. VR602 amp VR601 000000 Test points gt 00000 Figure 11 Power and High Voltage board viewed from the instrument bottom 1 Set up the oscilloscope as follows VERTICAL MODE CHI 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 display 5 Adjust VR701 on the Power and High Voltage board until one cycle spans five divisions See Figure 11 for the adjustment location 6 Verify that the display amplitude is 2 Vp p 2 and the duty cycle ratio is approximately 1 to 1 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures Cursors and Readout Adjustments To locate the adjustments for the following procedures refer to Figure 13 The Control and I O board occupies the top left hand corner of the instrument Cursor Accuracy Use the following procedure to adjust the cursor accuracy 1 Simultaneously press the front panel PROBE X1 X10 and the AV AT 1 AT 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 positio
7. 4 V 40 V 400 V 600 V DC Accuracy 0 3 of reading 2 counts AC Accuracy 40 to 50 Hz 1 5 of reading 5 counts 50 to 60 Hz 1 0 of reading 5 counts 60 Hz to 1 kHz 1 5 of reading 5 counts Input Impedance Maximum 1 MQ paralleled by 100 pF Current DC Ranges 400 mA 8A AC Ranges 400 mA 8A DC Accuracy 400 mA Range 0 6 of reading 3 counts 8 A Range 0 8 of reading 4 counts AC Accuracy 40 to 1 kHz 400 mA Range 1 8 of reading 5 counts 8 A Range 1 8 of reading 5 counts Overload protection N mA Connector 500 mA 350 V fast blow fuse Tektronix part number 159 0389 00 A Connector 15 A 600 V fastblow fuse Tektronix part number 159 0287 00 Resistance Ranges 400 O 4 kO 40 kO 400 kO 4 MO 40 MO Accuracy By range 400 Q 0 4 of reading 4 counts 4 KQ 40 KQ 400 kQ 0 4 of reading 2 counts 4MQ 0 6 of reading 3 counts 40MQ 1 5 of reading 5 counts Frequency Ranges 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 4 Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Specifications Table 2 Measurement characteristics cont Characteristic Description Accuracy By range 100 Hz 1 kHz 10 kHz 100 kHz 0 1 of reading 4 counts 1 MHz 0 5 of reading 4 counts Sensitivity 100 Hz 1 kHz 10 kHz 40 mVems 100 kHz 1 MHz 400 mVams Lowest Measurable Frequency 10 Hz Continuity Diode Test Test Current 1 0 mA Test Voltage 5 V maximum Table 3
8. 5 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 6 Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 5 000 A 7 Record the DMM voltage V1 8 Turn off the electronic load and record the DMM voltage again V2 9 Verify that the difference between V1 and V2 is X6 mV 10 Press OUTPUT ON OFF Verify that the OUT indicator turns off 11 Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 terminals and connect them to the OUTPUT 2 terminals on the rear of the instrument Maintain the equipment configura tion and polarities shown in Figure 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 12 13 14 15 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Disconnect the DMM and electronic load from the instrument Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 10 11 12 13 14 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic l
9. Enter a GPIB address lt 0 to 30 gt and press Press SHIFT ADDRESS Verify that the address entered in step 2 above appears on the readout for about one second Complete the following procedures to verify voltage setting and readout accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 9 10 11 12 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 36V OVP SET 37V Press STEP SET Set the VOLTS SET to 0 05 V Ensure that the power supply output is disabled Configure the DMM to measure 40 VDC across the front panel OUTPUT 1 2 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 35 950 and 36 050 VDC Press VOLTS A or VOLTS V7 to adjust the power supply output voltage until the DMM reads 36 00 VDC Verify that the power supply VOLTS readout indicates between 35 950 and 36 050 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 1 2 terminals Verify that the DMM reads between 0 0749 and 0 1250 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 13 14 Press SHIFT OUT 2 ve
10. NB COM Figure 9 Crosstalk between DMM and scope test Setup 3 Set the leveled sine wave generator for a 2 5 Vp p signal at 5 MHz 4 On the THM500 series instrument press the POSITION SCALE button until the readout shows SCALE in the lower right corner Use the A and v buttons to set the vertical scale to 50 mV div and the lt and gt buttons to set the time base to 2000 ps div 5 Use the THM500 series instrument menus to set the sampling mode to SPIKE DETECT then remove the menus from the display 6 Verify that the peak to peak amplitude is less than 0 5 divisions 25 mV Crosstalk Between The following check assesses the crosstalk between oscilloscope channels If Oscilloscope Channels your instrument has only one channel THMS550 do not perform this test 1 Connect the leveled sine wave generator output to the THM500 series instrument CH and COM inputs Use a 50 Q termination as shown in Figure 10 Assure that the ground connection for each adapter connects to the common or ground connector of its associated instrument 2 Connect the THM500 series instrument CH 2 input to the COM input using a patch cord as shown in Figure 10 Bench Test Instruments and Handheld Oscilloscopes Basic Service 21 THM500 Series Performance Verification 22 Leveled Sine 50 Q cable Patch cord 50 Q termination BNC to dual banana cable Wave generator
11. Probe Comipensation 1er ose bee E UN SEXUS ERE ERE REPE 42 Cursors and Readout Adjustments 0 0 0 0 00 eee 43 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service LS eee TAS 200 Series Oscilloscopes The Tektronix TAS 220 and TAS 250 oscilloscopes are dual channel products with frequency bandwidths of DC to 20 MHz and DC to 50 MHz respectively Both oscilloscopes feature a maximum sensitivity of 1 mV division and a maximum sweep speed of 10 ns division In addition the TAS 200 series oscilloscopes offer the following features High beam transmission and high intensity CRT displays for clear waveforms at high sweep speeds High stability low drift temperature compensation circuits to reduce baseline and DC balance drift Trigger feature Set to 50 that eliminates triggering adjustments when displaying regular video and large duty cycle ratio signals Synchronization separator and trigger circuitry that permits the display of TV signals You can automatically select vertical and horizontal signals with the SEC DIV control Automatic focus following an initial intensity adjustment Tektronix TAS 220 Figure 1 TAS 220 oscilloscope Bench Test Instruments and Handheld Oscilloscope
12. The instrument operates in a 0 to 40 C 32 to 104 F ambient environ ment unless otherwise noted m The instrument warms up for at least twenty minutes NOTE All characteristics are warranted unless marked typical Typical characteristics are not guaranteed but are provided for the convenience of the user Table 1 Operational characteristics Characteristic Outputs Voltage 5 V Fixed Supply Voltage 0 to 30 V Supplies Line regulation 5V CV CC Load regulation 5V CV CC Description One fixed 5 VDC two variable 0 to 30 VDC 5 0 VDC 0 25 VDC at 3 0 A maximum foldback current limited PS280 0 to 30 VDC constant at 2 0 A constant maximum PS283 0 to 30 VDC constant at 1 0 A constant maximum lt 5 mV PS280 lt 0 01 3 mV PS283 lt 0 01 5 mV lt 0 2 3 mA lt 0 2 x 0 0196 3 mV rating current lt 3 A lt 0 01 5 mV rating current gt 3 A PS280 x 300 mV 0 to 60 VDC single series tracking supply lt 0 2 3 mA Bench Test Instruments and Handheld Oscilloscopes Basic Service 3 PS280 and PS283 Specifications Table 1 Operational characteristics cont Characteristic Description Ripple and Noise 5V lt 2 mVems CV 5 Hz to 1 MHz x 1mVgys CC z3mAgus Temperature coefficient CV x 300 ppm C Recovery time CV x 100 us time to recover after a 50 load change with 0 5 A minimum Tracking error SLAVE lt 0 5 10 mV ofthe MASTER supply
13. current until the DMM reads 3 000 A Verify that the power supply CURRENT A readout indicates between 2 974 and 3 026 A Press CURRENT SET Set the power supply output current to 0 1 A Verify that the DMM reads between 0 089 and 0 111 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Disconnect the DMM from the power supply output terminals Overvoltage Complete the following procedures to verify OVP overvoltage protection Protection Accuracy accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Press OVP SET set the OVP to 38 6 V Verify that the power supply readouts display the error message Err 065 Press OVP SET again set the OVP to 38 5 V Verify that the power supply readouts display no error message Set up the power supply as follows VOLTS SET 34 5 V CURRENT SET LA OVP SET 36V Press STEP SET Set the VOLTS SET to 0 02 V Bench Test Instruments and Handheld Oscilloscopes Basic Service 17 PS2520 and PS2521 Series Performance Verification 18 6 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 7 Press VOLTS A to increase the power supply output voltage until the error mess
14. front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 4 11 Repeat steps 4 through 8 above Outputs 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT gt OUT 3 verify that the 3 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service 49 PS2520 and PS2521 Series Performance Verification 50 Constant Current Load and Overcurrent Protection Accuracy Ensure that the power supply output is disabled Connect the oscilloscope and 2 2 Q 50 W resistor to the front panel OUTPUT 3 terminals See Figure 4 for details Set up the power supply as follows VOLTS SET 6V CURRENT SET 5 1A OVP SET 7N Repeat steps 5 through 8 of the Outputs 1 and 2 procedure above Remove the Variac from the test setup and repower the instrument Allow 20 minutes for the power supply to warm up and stabilize before the next check Complete the following procedures to verify constant current load and overcur rent protection accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 5 for details igi i Elect
15. model number is displayed Use the menus to select RESET ALL It will appear underlined Press the SELECT button and wait for the confirmation message then press the SELECT button again Verify that the instrument returns to its power on mode m THM550 THM560 THM565 THM570 or THM570U instruments return to METER mode m THM571 THM575 or THM570U Option 3K instruments return to a banner screen Bench Test Instruments and Handheld Oscilloscopes Basic Service 11 THM500 Series Performance Verification DMM Verification 12 DC Voltage Accuracy A The following checks verify the performance of the DMM functions The oscilloscope verification begins on page 15 NOTE The THM575 can display menus in more than one language The language selections are located in the Utility menu The following check verifies DC voltage accuracy WARNING This test uses hazardous voltages If you use standard banana plugs to apply test signals to the THM500 series instrument do not touch the exposed conductors 1 Set the THM500 series instrument to METER mode displaying V DC If the range display at the lower right does not indicate AUTO press the A and v buttons simultaneously to set the RANGE to AUTO 2 Connect the voltage source output to the THM500 series instrument DMM and COM inputs as shown in Figure 2 Assure that the ground connection for each adapter connects to the common or ground connector of its associa
16. verify that the 2 indicator lights up on the display Set up the power supply as follows VOLTS SET 10 V CURRENT SET 2 5A OVP SET 11V Press STEP SET Set the CURRENT SET to 0 002 A Bench Test Instruments and Handheld Oscilloscopes Basic Service 39 PS2520 and PS2521 Series Performance Verification 40 Overvoltage Protection Accuracy 10 11 12 13 14 Ensure that the power supply output is disabled Configure the DMM to measure 10 amperes DC across the power supply front panel OUTPUT 2 terminals Press SHIFT gt PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 4 970 and 5 030 A Press CURRENT A or CURRENT Y to adjust the power supply output current until the DMM reads 5 000 A Verify that the power supply CURRENT A readout indicates between 4 970 and 5 030 A Press CURRENT SET Set the power supply output current to 0 1 A Verify that the DMM reads between 0 089 and 0 111 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Disconnect the DMM from the power supply output terminals Complete the following procedures to verify OVP overvoltage prote
17. 250 reference amplitude minimum amplitude bandwidth bandwidth 1 mV 6 divisions 4 2 divisions 10 MHz 15 MHz 2 mV 6 divisions 4 2 divisions 10 MHz 15 MHz 5 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 10 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 20 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 500 mV 6 divisions 4 2 divisions 20 MHz 50 MHz 1V 4 divisions 2 8 divisions 20 MHz 50 MHz 4 Repeat steps through 3 for CH 2 DC Balance To check DC balance accuracy perform the following steps Bench Test Instruments and Handheld Oscilloscopes Basic Service 1 Set up the oscilloscope as follows VERTICAL MODE CH 1 CH 2 GND CH 1 CH 2 VARIABLE CHI CH2 In CAL 2 Verify that the oscilloscope trace shift is less than 0 5 divisions when rotating the CH 1 CH 2 VOLTS DIV control between the 5 mV and 5 V settings 3 Verify that the oscilloscope trace shift is less than two divisions when the CH 1 CH 2 VOLTS DIV control is changed from the 1 mV to the 2 mV setting 4 Repeat steps 1 through 3 above for CH 2 13 TAS 200 Series Performance Verification 14 Variable DC Balance To check Variable DC balance accuracy perform the following steps 1 3 Set up the oscilloscope as follows VERTICAL MODE CH1 CH2 CH 1 CH 2 AC DC DC CH 1 CH 2 GND In CH 1 CH 2 VOLTS DIV 10 mV Verify that the oscilloscope trace shift is less than one division between the fully clockwise and the fully counterclockwise positio
18. Adjust the load until the power supply CURRENT A readout indicates 1 500 A Bench Test Instruments and Handheld Oscilloscopes Basic Service 19 PS2520 and PS2521 Series Performance Verification 20 10 11 12 13 14 15 16 17 18 19 20 Record the DMM voltage V1 Turn off the electronic load and record the DMM voltage again V2 Verify that the difference between V1 and V2 is lt 6 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the OUTPUT 1 terminals on the rear of the instrument Maintain the equipment configura tion and polarities shown in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 4 through 10 above Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 terminals and connect them to the OUTPUT 2 terminals on the rear of the instrument Maintain the equipment configura tion and polarities sho
19. Bench Test Instruments and Handheld Oscilloscopes Basic Service 13 PS2520 and PS2521 Series Performance Verification 10 11 12 13 Ensure that the power supply output is disabled Configure the DMM to measure 100 VDC across the front panel OUTPUT 2 and OUTPUT 1 terminals Press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 71 900 and 72 100 VDC Press VOLTS A or VOLTS V7 to adjust the power supply output voltage until the DMM reads 72 000 VDC Verify that the power supply VOLTS readout indicates between 35 950 and 36 050 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 2 and OUTPUT 1 terminals Verify that the DMM reads between 0 1498 and 0 2500 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Parallel Operation Use the following steps to check the parallel mode accuracy 1 2 14 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Set up the power supply as follows VOLTS SET 36V OVP SET 37V Press STEP SET Set the VOLTS SET to 0 05 V Ensure that the power supply output is disabled Configure the DMM to measure 40 VDC across the power su
20. Indicator Two 3 digit 0 5 inch LED panel displays Meter indicators 0 to 30 VDC 0 5 of RDG 2 digits 0 to 2 A 0 5 of RDG 2 digits Insulation Chassis to terminals z 20 MQ at500 VDC Chassis to AC cord z 30 MQ at500 VDC Table 2 Electrical characteristics Characteristic Description Line Voltage 90 to 110 108 to 132 198 to 242 and 216 to 250 VAC Line Frequency 50 to 60 Hz Power Consumption PS 280 348 VA 250 W maximum PS 282 254 VA 172 W maximum Table 3 Environmental characteristics Characteristic Description Operating Temperature 0 to 40 C 32 to 104 F lt 70 relative humidity Nonoperating Temperature 10 to 470 C 14 to 158 F lt 80 relative humidity 4 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Specifications Table 4 Physical characteristics Characteristic Width Height Depth Weight Description 255 mm 10 04 inch 145 mm 5 71 inch 335 mm 13 19 inch PS280 11 5 kg 25 3 lb PS283 9 0 kg 19 8 Ib Bench Test Instruments and Handheld Oscilloscopes Basic Service 5 PS280 and PS283 Specifications 6 Bench Test Instruments and Handheld Oscilloscopes Basic Service lm PS280 and PS283 Performance Verification This section contains procedures to verify that P5280 or PS283 power supplies perform as warranted Implement the performance verification procedures whenever the accuracy or function of your instrument is i
21. Performance Verification 22 12 13 14 15 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Disconnect the DMM and electronic load from the instrument Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 10 11 12 13 14 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 2 Set the DMM to measure 10 VDC Set up the power supply as follows VOLTS SET 6V CURRENT SET 3 1A OVP SET 7N Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 3 000 A Record the DMM voltage V1 Turn off the electronic load and record the DMM voltage again V2 Verify that the difference between V1 and V2 is lt 6 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 3 terminals and connect them to OU
22. Three shocks per axis TestDuration 10 minutes atthe peak resonance condition 33 Hz if no resonance found Test performed on each of three axes EMC Emissions Immunity IEC 801 2 electrostatic discharge Up to 8 kV IEC 801 3 radiated immunity 3 V meter 27 to 500 MHz Mechanical Size Weight Tripod Socket Safety Certifications Surge Protection Withstands incidental line surges up to 6 kV comprised of a minimum rise time of 1 2 us and a maximum 50 us duration minimum of 2 minutes between pulses Maximum volt hertz product 50 V MHz Fuse General Safety Class 2 e jo o 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service an 7 THM500 Series Performance Verification This section contains procedures to verify that the THM500 Series instruments perform as warranted Verify instrument performance whenever the accuracy or function of your instrument is in question The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions m The instrument operates within the environmental conditions specified in Table 4 on page 8 during the verification process m The instrument operates continuously for a 5 minute period before the verification begins The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently Table 6 lists the equipment needed
23. Waveform display characteristics Characteristic Description Display Region 8 Horizontal divisions and 4 vertical divisions 16 dots division Vertical Voltage Input Bandwidth 20 mV to 1 V div DC to 5 MHz 2 V to 200 V div DC to 3 MHz Current Inputs Rise Time Limits 400 mA Connector 2500 ns 8 A Connector 25 us Voltage Ranges 20 mV div to 200 V div CurrentRanges mA 2 to 500 mA div A 200 mA div to 10 A div Sample Rate 16 MS s Resolution 6 bits Coupling DC and AC 3 dB at 15 Hz Input Impedance 1MQ Bench Test Instruments and Handheld Oscilloscopes Basic Service 5 THM420 Specifications Table 3 Waveform display characteristics cont Characteristic Description DC Accuracy 3 5 2 pixels Horizontal Sweep Time 100 ns div to 10 s div Using roll mode 0 2 s div to 10 s div Position Settings Left edge 8 divisions shown after the trigger point Centerscreen 4 divisions shown before and after trigger point Right edge 8 divisions shown after the trigger point Trigger Trigger Mode Auto Coupling DC Slope Positive or negative Table 4 Physical characteristics Characteristic Description Height 6 5 cm 2 56 inch Width 9 cm 3 54 inch Depth 20 8 cm 8 19 inch Weight With batteries approximately 640 g 22 6 02 Table 5 Environmental characteristics Characteristic Description Temperature Operating 0 to 50 C Nonoperating Storage 20 to 70 C Humidity Operating 0 to 40 C lt 8
24. ambient environ ment m The instrument warms up for at least 20 minutes W The cabinet remains installed on the instrument The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently The PS2520 series performance verification consists of the checks listed in Table 5 Table 5 Performance verification checks Basic Function Voltage Set Accuracy Current Set Accuracy Overvoltage Protection OVP Accuracy Constant Voltage Load Accuracy Constant Voltage Source Accuracy Constant Voltage Ripple and Noise Accuracy Constant Current Load and Overcurrent Protection OCP Accuracy Constant Current Source Accuracy There are two separate performance verification procedures for the PS2520 2520G and PS2521 2521G series instruments The PS2520 2520G procedures begin on page 9 the PS2521 2521G procedures begin on page NO TAGNO TAG Use the procedure appropriate to your instrument You will find the recommended test equipment and initial settings for all verification procedures listed on page 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service 7 PS2520 and PS2521 Series Performance Verification Test Equipment The performance verification procedures use external traceable test equipment to directly check warranted characteristics Alternative test equipment must meet or exceed the intended minimum requirements If you substitute equipmen
25. below the center of the graticule d Press the THM500 series instrument CURSORS TRIGGER button to show the cursors then use the A and V buttons to move one cursor over the waveform e Setthe voltage source output to the value in the third column press the THM500 series instrument SELECT button to select the second cursor and position the second cursor over the new waveform position 18 Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS5S00 Series Performance Verification f Observe the AV readout on the THM500 series instrument display and verify that its absolute value falls within the range listed in the fourth column Table 10 Vertical accuracy test settings THM500 series DC voltage source DC voltage source Instrument AV readout vertical scale first cursor second cursor ignore polarity 5 mV div 15mV 15 mV 27 5mV to 32 5 mV 100mV div 300 mV 300 mV 552 mV to 648 mV 1 V div 3 V Hv 5 52 V to 6 48 V 10V div 30V 30V 55 2 V to 64 8 V 100V div 300 V 300 V 552 V to 648 V 4 If your THM500 series instrument is equipped with two channels repeat Step 3 all tests above on CH 2 5 Disconnect the test setup Analog Bandwidth The following check assesses the analog bandwidth 1 Connect the leveled sine wave generator output to the THM500 series instrument CH and COM inputs Use a 50 Q termination as shown in Figure 8 Assure that the ground connection for each adapter connects to
26. display Record the DMM current reading 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the wire connect ing the power supply OUTPUT terminal to the electronic load terminal Move the electronic load connection to the power supply OUTPUT terminal Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Record the DMM current reading again I2 Verify that the difference between I1 and I2 is lt 0 003 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Press OCP ON OFF Verify that the OCP indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the power supply readouts display the error message Err 012 Press OUTPUT ON OFF Verify that the OUT indicator turns off Press OCP ON OFF to return the power supply to normal operation Verify that the OCP indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 5 Repeat steps 4 through 18 above Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verificatio
27. load to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 3 3 Set up the power supply as follows VOLTS SET 6V CURRENT SET 3 1A OVP SET 7N 4 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 5 Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 3 000 A 6 Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM readout changes lt 0 003 V over the adjustment range 7 Press OUTPUT ON OFF Verify that the OUT indicator turns of then disable the electronic load 8 Disconnect the DMM and electronic load from the instrument Constant Voltage Complete the following procedures to verify constant voltage ripple and noise Ripple and Noise accuracy Accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Press SHIFT gt OUT I verify that the 1 indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the oscilloscope and 27 Q 100 W resistor to the front panel OUTPUT 1 terminals See Figure 4 for details Bench Test Instruments and Handheld Oscilloscopes Basic Service 25 PS2520 and PS2521 Series Performance Verification 26 Power supply Oscilloscope Figure 4 Constant voltage ripple and noise test s
28. offset calibration is complete Set the DMM to the 10 A range and press on the power supply Verify that the power supply readout displays cL21 indicating current full scale calibration Enter the DMM reading on the power supply keypad and press Verify that the power supply readout displays cL2F indicating that the current full scale calibration is complete Disconnect the DMM from the power supply Press lt on the power supply and verify that the readout displays cL30 indicating overvoltage protection offset calibration Wait 10 seconds and verify that the readout displays cL31 indicating that the overvoltage protection full scale calibration is running Wait another 10 seconds for the readout to return to normal The calibration is complete Output 2 Use the following steps to calibrate OUTPUT 2 1 2 3 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Perform steps 2 through 5 of the Output 1 procedure above Connect the DMM positive and negative leads to the corresponding front panel OUTPUT 2 and terminals Perform steps 7 through 18 of the Output 1 procedure above Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Adjustment Procedures Parallel Output Current Offset Use the following steps to calibrate the parallel output offset current 1 2 3 Press SHIFT OUT 2 verify that the 2 indicator lights
29. output of the leveled sine wave generator to the 50 Q termination then connect the 50 Q termination to the TAS 200 series oscilloscope CH 1 CH 2 input See Figure 3 below Leveled Sine Wave Generator Precision cable 50 Q Termination Figure 3 Bandwidth check setup 2 Set up the oscilloscope as follows VERTICAL MODE CHI CH2 CH 1 CH 2 AC DC DC CH 1 CH 2 VOLTS DIV mV HORIZONTAL SEC DIV 10 us 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 Setthe oscilloscope CH 1 CH 2 VOLTS DIV control as indicated b Setthe leveled sine wave generator to the specified 50 kHz reference amplitude c Verify that the oscilloscope display amplitude remains greater than the bandwidth minimum amplitude minimum number of divisions while increasing the leveled sine wave generator frequency to the specified value for the CH 1 CH 2 VOLTS DIV setting and oscilloscope model Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verification Table 14 DC coupled bandwidth NOTE At lower VOLTS DIV settings you might need to set TRIGGER COU PLING to HF REJ to minimize noise or double triggering Volts Div Bandwidth TAS 220 TAS
30. polarities shown in Figure 6 Repeat steps 5 to 8 above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 2 Press SHIFT gt PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display 3 Set the DMM to measure 5 amperes DC 4 Set up the power supply as follows VOLTS SET 36V CURRENT SET 3 0A OVP SET 38 5 V 5 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 6 Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM current variation is lt 0 006 A over the adjustment range 7 Press OUTPUT ON OFF Verify that the OUT indicator turns off 8 Press SHIFT gt PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT gt OUT 3 verify that the 3 indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and 2 2 Q 50 W resistor to the front panel OUTPUT 3 terminals See Figure 6 for details 3 Set up the power supply as
31. power supply output to calibrate press SHIFT lt OUT 1 OUT 2 or OUT 3 gt For a Parallel Output calibration select OUT 2 Press SHIFT CURRENT W Enter a calibration password on the keypad PS2520 amp PS2520G enter 2520 PS2521 amp PS2521G enter 2521 Verify that the power supply readout displays cL00 indicating calibration mode Configure the DMM function and range as outlined in table 12 Bench Test Instruments and Handheld Oscilloscopes Basic Service 63 PS2520 and PS2521 Series Adjustment Procedures 64 Table 12 Set DMM function and range Calibration type DMM range All voltage calibrations DC Volts Autorange Current offset DC Amperes 2A Current full scale DC Amperes 10A 6 Connect the DMM to the power supply as outlined in table 13 Table 13 DMM to power supply connections Calibration type Display code Connection instructions Voltage cL10 cL11 Connect DMM positive and negative leads to the corresponding power supply and OUTPUT terminals Current CL20 cL21 Connect DMM positive and negative leads to the corresponding power supply 4 and OUTPUT terminals Overvoltage Protection cL30 cL31 No connection from DMM to power supply Parallel Output Current cL40 cL41 Connect DMM positive and negative leads to the corresponding power supply 4 and OUTPUT terminals NOTE The DMM range and function must be properly selected before proceed ing to the ne
32. provides the necessary service information to verify that your instrument is working properly Should you have service related questions not covered in either this manual or in an optional service manual please contact your Tektronix Service Center for additional information For product warranty information refer to the user manual supplied with your instrument Benchtop Instruments Basic Service ix Preface Contacting Tektronix Phone Address Web site Sales support Service support Technical support This phone number is toll free in North America After office hours please leave a 1 800 833 9200 Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA www tektronix com 1 800 833 9200 select option 1 1 800 833 9200 select option 2 Email techsupport tektronix com 1 800 833 9200 select option 3 1 503 627 2400 6 00 a m 5 00 p m Pacific time voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices Benchtop Instruments Basic Service Instructions Manual Tektronix f PS280 and PS283 Power Supplies 070 9894 01 OO AS E Table of Contents PS280 and PS283 Specifications ccc cece eee ee ee eens 3 PS280 and PS283 Performance Verification Les T Test Equiprient iniclRIDI4eebRMERRRS Re Me Reed nb RR E e RE
33. reading when the HOLD button is pressed Difference between HOLD reading and active reading Resolution 0 1 mV 1mV 10 mV 100 mV 1V Autorange available selects from all ranges except 400 mV Accuracy 0 5 of reading 5 counts Normal Mode Rejection gt 60 dB typical atuser selectable 50 or 60 Hz Common Mode R ejection gt 100 dB typical at user selectable 50 or 60 Hz AC voltage Range and Resolution True RMS Resolution 0 1 mV 1 mV 10 mV 100 mV 1V Autorange not available on 400 0 mV range Accuracy 2 of reading 5 counts for 50 or 60 Hz sine wave Add 2 of reading plus 5 counts for nonsinusoidal signal with crest factor lt 3 Q resistance Range and Resolution Range Resolution 400 Q 0 10 4kQ 1Q 40 kQ 100 400 kO 100 Q 4MO 1kQ 40MQ 10 KQ Autorange available Accuracy 0 5 of reading 2 counts 40 MQ range is 2 of reading 5 counts at e jo o lt 60 relative humidity Derate 4 MQ range to 1 of reading 2 counts from 60 to 90 relative humidity 4 Bench Test Instruments and Handheld Oscilloscopes Basic Service THM500 Series Specifications Table 2 DMM specifications cont 550 560 565 Diode test Range 0 to 2 V Red input connector is positive o o Continuity check Indication Audible tone and graphic of a closed switch displayed when resistance is lt 50 Q typical Indicators optionally disabled Table 3 Scope specifications 550 560 565 Mod
34. steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Set up the Variac Connect the power supply AC input to the Variac variable output Allow 20 minutes for the power supply to warm up and stabilize Bench Test Instruments and Handheld Oscilloscopes Basic Service 29 PS2520 and PS2521 Series Performance Verification 30 2 3 4 5 10 11 Ensure that the power supply output is disabled Connect the DMM and 27 Q 100 W resistor to the front panel OUTPUT 1 terminals See Figure 6 for details Digital multimeter Power supply Resistor i Figure 6 Constant current source test setup Set the DMM to measure 2 amperes DC Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 36 V CURRENT SET 1 5 A OVP SET 38 5 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM current variation is 0 003 A over the adjustment range Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment configuration and
35. that the OUT indicator lights up on the display Verify that the DMM reads between 2 984 and 3 016 A Press CURRENT A or CURRENT to adjust the power supply output current until the DMM reads 3 000 A Verify that the power supply CURRENT A readout indicates between 2 984 and 3 016 A Press CURRENT SET Set the power supply output current to 0 1 A 10 Verify that the DMM reads between 0 089 and 0 111 A 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off Parallel Operation Use the following steps to the check parallel mode accuracy 1 2 3 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Set up the power supply as follows VOLTS SET 10 V CURRENT SET LSA OVP SET 11 V Press STEP SET Set the CURRENT SET to 0 002 A Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 Ensure that the power supply output is disabled Configure the DMM to measure 10 amperes DC across the power supply front panel OUTPUT 2 terminals Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 2 974 and 3 026 A Press CURRENT A or CURRENT to adjust the power supply output
36. the common or ground connector of its associated instrument 2 Press the THM500 series instrument CURSORS TRIGGER button until the readout shows TRIG in the lower right corner then use the 4 and V buttons to set the trigger level to center screen Leveled Sine Wave generator 50 Q cable 50 Q termination BNC to dual banana cable Figure 8 Analog bandwidth test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service 19 THM500 Series Performance Verification 3 On the THM500 series instrument press the POSITION SCALE button until the readout shows SCALE in the lower right corner 4 For each row of Table 11 perform the following steps a Use the THM500 series instrument A and V buttons to set the vertical scale to the setting listed in the first column b Set the horizontal scale of the THM500 series instrument to 10 us div and the frequency of the leveled sine wave generator to 50 kHz c Adjust the leveled sine wave generator amplitude to show the waveform height and cursor readout listed in the second column d Set the horizontal scale of the THM500 series instrument to 200 us div and the leveled sine wave generator to the test frequency listed in the third column e Verify that the amplitude of the waveform displayed on the THM500 series instrument is greater than or equal to the value listed in the third column Use the cursors f
37. the following procedures refer to Figures 8 and 10 The Main board occupies the bottom right side of the instrument Use the following procedure to adjust the X10 MAG registration 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 VERTICAL POSITION Midrange HORIZONTAL SEC DIV ms Rotate the HORIZONTAL POSITION control to move the left edge of the trace to the display center center vertical graticule line Set the HORIZONTAL X10 MAG push switch to the in position Verify that the trace is located within 1 division of the display vertical center If the trace does not line up use the HORIZONTAL POSITION control to reposition the trace to the display center 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 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 and out Use the following procedure to adjust the horizontal position 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 VERTICAL POSITION Midrange HORIZONTAL SEC DIV ms Center the HORIZONTAL POSITION control Adjust VR408 to align the left edge of the trace to the left most graticule of the display See Figure 8 for the adjustment location Use the following procedure to adjust the 1 ms timing 1 Set up the oscillo
38. the instrument You must remove the instrument cover to make internal adjustments WARNING To avoid electrical shock always disconnect the power cord from its source before removing the instrument cover After the adjustment procedures replace the instrument cover before using the oscilloscope To remove the cover refer to Figure 12 while performing the following steps 1 Remove the two cover screws on the instrument bottom 2 Remove the four rear panel mounting screws 3 Remove the rear panel 4 Slide the cover off the rear of the instrument To reinstall the cover perform steps 1 through 4 above in reverse order Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures t Rear panel mounting screws 4 Cover screws 2 ia d r Instrument T Cover er Figure 6 TAS 220 and TAS 250 instrument cover removal Bench Test Instruments and Handheld Oscilloscopes Basic Service 25 TAS 200 Series Adjustment Procedures Initial Settings 26 Following the warm up period preset the oscilloscope to the settings listed below Table 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 Mi
39. the side Do not disconnect any cables 3 Fold back the insulating shield that separates the top circuit board from the bottom circuit board To reinstall the top circuit board following the adjustments perform steps 1 through 3 above in reverse order 18 Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Adjustment Procedures Mounting screws Lift and position circuit board Fold back shield E Main circuit board Figure 3 Exposing the Main circuit board Adjustment Procedure To return your instrument to factory calibration perform the following procedure 1 a A Ye PF YS p Turn the THM420 rotary switch to Vz Press the METER SCOPE button to select SCOPE mode Set the AC DC button to DC Connect the COM input to the V Q Hz input with a shorting strap Set the vertical offset POS to 0 mV Set the vertical SCALE to 200 V Adjust R80 to align the trace to the display center line See Figure 4 for the adjustment location Set the vertical scale to 20 mV Adjust R84 to align the trace to the display center 10 If necessary repeat steps 5 through 9 above to achieve a fine adjustment Bench Test Instruments and Handheld Oscilloscopes Basic Service 19 THM420 Adjustment Procedures 20 11 12 13 14 15 16 Turn the rotary switch to mA Press the METER SCOPE button to select SCOPE mode Set the AC DC button to DC Set the vertical offset POS
40. the values listed in Table 13 then verify that the readings on the oscilloscope remain within the limits of the Displayed Signal Accuracy 10 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verification Table 13 DC gain and displayed signal accuracy TAS 200 volts div scale Generator output Displayed signal accuracy 1 mV 5 mV 4 75 to 5 25 div 2 mV 10 mV 4 75 to 5 25 div 5 mV 20 mV 3 88 to 4 12 div 10 mV 50 mV 4 85 to 5 15 div 20 mV 0 1V 4 85 to 5 15 div 50 mV 0 2V 3 88 to 4 12 div 100 mV 0 5V 4 85 to 5 15 div 200 mV 1V 4 85 to 5 15 div 500 mV 2V 3 88 to 4 12 div 1V 5V 4 85 to 5 15 div 2V 10V 4 85 to 5 15 div 5V 20V 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 waveform is reduced to two divisions or less 7 Set the oscilloscope CH 1 CH 2 VERTICAL VARIABLE control to the CAL position 8 Disconnect the test setup from the oscilloscope 9 Repeat steps through 8 for CH 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service 11 TAS 200 Series Performance Verification 12 DC Coupled Bandwidth To check DC coupled bandwidth accuracy perform the following steps 1 Use the 50 Q precision coaxial cable to connect the
41. to 0 mA Set the vertical SCALE to 2 mA Adjust R86 to align the trace to the display center Figure 4 Adjustment locations Bench Test Instruments and Handheld Oscilloscopes Basic Service Instructions Manual Tektronix f THM500 Series Instruments 070 9857 01 OO a Table of Contents THM500 Series Instruments cccccccccccccccccecees 1 THM500 Series Specifications cee ee ee eee eee 3 THM500 Series Performance Verification eee 9 Test Equiptientzg ueniet ertt beri seb RU SERE EL PREIS IR Es 10 Functional Test imber b Lb ber D Les x da De oth desde des 11 DMM Verification 0 0 0 ccc RR RR RR 3 e e s 12 Oscilloscope Verification skeie nnne nnie nii Enin eh 15 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service eae THM500 Series Instruments The Tektronix THM500 Series instruments combine the features of a complete digital multimeter DMM with the power of an oscilloscope all in a single package The DMM portion of these instruments measure true RMS AC and DC voltage resistance continuity with audible mode and a diode test The DMM portion also includes the following features W A hold feature to freeze the display m MIN and MAX readouts to track instantaneous signal variations from the last held value A Hold m AC and DC current measurement
42. up on the display Press SHIFT CURRENT V Enter the calibration password on the keypad PS2520 amp PS2520G enter 2520 PS2521 amp PS2521G enter 2521 Verify that the power supply readout displays cL00 indicating calibration mode Configure the DMM to measure 2 amperes DC Enter 4 on the power supply keypad and press Verify that the PARA indicator lights up on the display and the readout displays cL40 indicating parallel output current offset calibration Enter the DMM reading on the power supply keypad and press The power supply readout will return to normal in approximately 10 seconds The calibration is complete Parallel Output Current Full Scale Use the following steps to calibrate the parallel output full scale current 1 2 3 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Press SHIFT CURRENT VY Enter the calibration password on the keypad PS2520 amp PS2520G enter 2520 lt PS2521 amp PS2521G enter 2521 lt Verify that the power supply readout displays cL00 indicating calibration mode Configure the DMM to measure 10 amperes DC Enter 4 on the power supply keypad Press VOLTS ZA to select the parallel output full scale current calibration verify that the the readout displays cL41 indicating parallel output full scale calibration Press lt on the power supply Verify that the PARA indicator lights up on the display
43. up the oscilloscope as follows VERTICAL MODE X Y CH 1 VOLTS DIV 10 mV CH 1 VARIABLE CAL HORIZONTAL X Y In 38 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures TRIGGER COUPLING AC TRIGGER SOURCE X Y 2 Use a 50 Q coaxial cable to connect the square wave generator to the CH 1 input Set up the generator for a 1 KHz 50 mV output 3 Adjust VR109 for exactly five divisions of horizontal deflection on the display See Figure 8 for the adjustment location X Axis Offset Use the following procedure to adjust the X axis DC offset 1 Set up the oscilloscope as follows CH 1 VERTICAL POSITION Midrange VERTICAL MODE CHI 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 extreme left 4 Set the HORIZONTAL X Y push switch to the in position 5 Adjust VR401 to position the spot to the center vertical graticule line See Figure 10 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service 39 TAS 200 Series Adjustment Procedures Trigger Adjustments Trigger DC Offset Trigger Slope Balance 40 To locate the adjustments for the following procedures refer to Figures 8 and 10 The Main board occupies the bottom right side o
44. 0 41 to 50 C lt 60 Altitude Operating 2 222 m 7290 ft Nonoperating 12 300 m 40354 ft 6 Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Specifications Table 5 Environmental characteristics cont Characteristic Description Vibration Operating 5 to 500 Hz 3 axes 10 minutes each 2 66 gnus Nonoperating 5 to 500 Hz 3 axes 10 minutes each 3 48 gnus Table 6 Optical interface characteristics Characteristic Description 945 nm 38 kHz Reception Range Approximately 1 meter Infrared Wavelength Carrier Wavelength Table 7 Certifications Characteristic Description Certifications Listed UL3111 1 and CSA C22 2 No 1010 1 Bench Test Instruments and Handheld Oscilloscopes Basic Service 7 THM420 Specifications 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service Sy UU THM420 Performance Verification This section contains procedures to verify that the THM420 performs as warranted If your instrument fails any of the checks it needs adjustment and or repair The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions The instrument operates in an 18 to 28 C environment with a relative humidity of less than 80 m The instrument remains fully assembled do not remove the bottom cover The THM420 performance verification consists of the checks
45. 0 Series Specifications The characteristics listed in this section apply under the following conditions W The instrument operates within the environmental conditions specified in Table 4 on page 8 unless otherwise noted m The instrument warms up for at least 5 minutes NOTE All specifications are warranted unless marked typical Typical characteristics are not guaranteed but are provided for the convenience of the user The specifications listed for the THM565 also apply to the THM57x series except as noted in Table 1 Table 1 How THM565 and THM57x series products differ 57x 565 Modes Line Test e Motor Test e Automotive preconfigured test setups e Vertical Mathematics capability o Invert capability e Measurements Voltage Measurement e Timing Measurement e Power Measurement e THDF Measurement e Automotive Measurements preconfigured test setups e Table 2 DMM specifications 550 560 565 General Resolution 334 digit 4000 count full scale reading except as noted Input Impedance Typical VDC or VAC 10 MO 10 pF 70 pF at 400 mV range Bench Test Instruments and Handheld Oscilloscopes Basic Service 3 THM500 Series Specifications Table 2 DMM specifications cont General Additional Readouts DC voltage Range and Resolution 550 560 565 Minimum voltage or resistance Maximum voltage or resistance Difference between MAX and MIN Value ofthe main
46. 00 Universal Calibration 3 amplitude regulation at 50 kHz to System with Oscilloscope Calibration 5 MHz Module Option 250 Output must provide 1 us markers Fluke 5500A Multi product Calibrator with 0 5 at 1 V amplitude Oscilloscope Calibration Option 5500 SC 300 mV 3 V 30 V 300 V 500 V with accuracy of 0 125 or better 300 mV 3 V 30 V 300 V 500 V with accuracy of 0 5 or better 10 Q 100 Q 1 KQ 10 kQ 100 kQ 1 MQ with accuracy of 0 125 or better 50 Q 2 2 W Tektronix 011 0049 xx 42 i 50 Q 1 04 m 42 inch long Tektronix 012 0057 xx o Tekroni012 3413x Stacking banana connector Tektronix 012 1450 xx Tektronix 103 0090 xx 10 Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS500 Series Performance Verification Functional Test The following steps verify basic instrument operation and reset the THM500 series instruments to factory default settings 1 Install fully charged batteries or use the THMCOM1 Communications Adapter or the THM5AC Power Adapter optional accessories to provide power Press the ON OFF button to turn the THM500 series instrument on Press the MENU ON OFF button to display the menus NOTE The THM575 can display the menus in more than one language The language selections are located in the Utility menu Select UTILITY STATUS DISPLAY from the menus Press the SELECT button Verify that the correct THM500 series instrument
47. 18 above To check the function of OUTPUT 3 press SHIFT OUT 3 Verify that the 3 indicator lights up on the display then continue with the steps below 19 10 Set up the power supply as follows VOLTS SET 5V CURRENT SET 2A OVP SET 7N DELAY 3s Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 20 21 22 23 24 25 26 27 28 29 Press SHIFT STORE 1 to store the above values in the memory 01 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values listed in step 19 for memory location 01 Reset the power supply as follows VOLTS SET 6V CURRENT SET 3A DELAY 3s Press SHIFT gt STORE 2 to store the above values in the memory 02 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values set in step 21 for memory location 02 Repeat steps 6 through 12 above Press STEP SET Set the VOLTS SET to 1 V Press VOLTS V7 and verify that as you attempt to decrease the voltage below 0 00 V Err 018 appears on the CURRENT A and VOLTS readouts The voltage should decrease in 1 volt steps on the VOLTS readout Press VOLTS A and verify that as you attempt to increase the voltage past 6 50 V Err 016 appears on readouts The voltage should increase in 1 volt steps on the VOLTS readout Press STEP SET Set the CURRENT SET to 1 A Press CURRENT
48. 2 5 A OVP SET 22 V 6 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 7 Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM current variation is lt 0 003 A over the adjustment range 8 Press OUTPUT ON OFF Verify that the OUT indicator turns off 9 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 10 Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 6 11 Repeat steps 5 to 8 above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Press SHIFT gt OUT 2 verify that the 2 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service 53 PS2520 and PS2521 Series Performance Verification Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicators light up on the display Set the DMM to measure 5 amperes DC Set up the power supply as follows VOLTS SET 20V CURRENT SET 5 0A OVP SET 22 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC
49. 220 V range Verify that the DMM current variation is lt 0 006 A over the adjustment range Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and 2 2 Q 50 W resistor to the front panel OUTPUT 3 terminals See Figure 6 for details Set up the power supply as follows VOLTS SET 6V CURRENT SET 5 0A OVP SET 7N Repeat steps 6 through 8 of the Outputs 1 and 2 procedure above This concludes the PS2521 and PS2521G performance verification procedures 54 Bench Test Instruments and Handheld Oscilloscopes Basic Service SS LS PS2520 and PS2521 Series Adjustment Procedures List of Adjustments This section contains procedures to adjust PS2520 and PS2521 Series power supplies If your instrument fails a performance requirement use these proce dures to return it to factory specifications In this section you will find the following information m Alistof the adjustments m A list of test equipment needed to make the adjustments m Instructions on how to prepare instruments for adjustment W Step by step adjustment procedures The procedures in this section do not
50. 488 2 Memory Locations Store and Recall Timer Setting Time 1 to 65535 seconds Resolution 1 second SH1 AH1 T6 L4 SR1 RL1 PPO DC1 DTO CO E1 00 to 49 50 locations Table 2 Electrical characteristics Characteristic Description Power Source 100 120 and 220 VAC 10 at 50 to 60 Hz 240 VAC 10 44 296 at50 to 60 Hz Safety ETL listed to UL 1244 Certified to C A C22 2 No 231 M89 Table 3 Environmental characteristics Characteristic Description Operating Temperature 0 to 40 C 32 to 104 F Nonoperating Temperature 10 to 70 C 14 to 158 F Bench Test Instruments and Handheld Oscilloscopes Basic Service 5 PS2520 and PS2521 Series Specifications Table 4 Physical characteristics Characteristic Description Width 255 mm 10 04 inch Height 145 mm 5 71 inch Depth 346 mm 13 62 inch Weight 10 kg 22 Ibs Bench Test Instruments and Handheld Oscilloscopes Basic Service ae PS2520 and PS2521 Series Performance Verification This section contains procedures to verify that PS2520 PS2520G PS2521 or PS2521G power supplies perform as warranted Implement the performance verification procedures whenever the accuracy or function of your power supply is in question The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions W The instrument operates in a 20 to 30 C 68 to 86 F
51. A NEEE OEE E EN EEE TA 8 PS2520 and PS2520G Checks 0 cece rnentri ekia iniia 9 PS2521 and PS2521G Checks 0 ccc cc eect enn 32 PS2520 and PS2521 Series Adjustment Procedures 55 Lastot Adjustments 4403 45 x bee br pete hmong oe ERG med EAR 55 Test Equipment 4 2 veo yt eo bbb Ne PIER D Ia eRE RES 56 Preparation for Adjustment 00 0 0 cece eee ee 56 Adjustment Procedure 54s IE hd ie peddus EEEa neue PERPE 58 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service SS LE PS2520 and PS2521 Series Power Supplies The Tektronix PS2520 PS2520G PS2521 and PS2521G power supplies are multifunction benchtop or portable instruments All PS2520 series power supplies include the following standard features Three high stability low drift outputs outputs may be configured for independent series or parallel operation Automatic series or parallel tracking Push button controls Keypad and up down key data entry Four digit display of voltage and current High resolution digital to analog converter Memory storage and recall Display readout of output memory and error codes Automatic sequencing with timer Self test diagnostic at power up Overvoltage protection OVP and overcurrent protection OCP Tektronix PS2521G Programmable Power Supply INTERFACE MEMORY CURRENT A VOLTS
52. ASTER output Adjust VR102 Master Slave circuit board for a reading of 15 mV within 15 mV on the multimeter Set the digital multimeter to measure a DC voltage of 35 V Set the MASTER VOLTAGE control to maximum fully clockwise Adjust VR101 Master Slave circuit board for a reading of 31 5 V on the multimeter Adjust VR201 Display Assembly circuit board until the PS280 PS283 front panel display reads 31 5 V Disconnect the digital multimeter from the power supply VR303 O C vR306 QO CO vR502 C vR302 QO C VR102 VR103 C Figure 7 Master Slave circuit board adjustments Bench Test Instruments and Handheld Oscilloscopes Basic Service 19 PS280 and PS283 Adjustment Procedures 20 SLAVE Voltage Output MASTER Current Output To 1 10 11 OJ O adjust the SLAVE voltage output perform the following steps Disengage both TRACKING mode switches both switches out so that the power supply is in the INDEPendent operating mode Set the SLAVE AMPS VOLTS meter selection switch to VOLTS Set the digital multimeter to measure a DC voltage of 16 mV Set the power supply SLAVE VOLTAGE control to minimum fully counterclockwise Connect the digital multimeter to the and terminals of the SLAVE output Adjust VR302 Master Slave circuit board for a reading of 15 mV within 15 mV on the multimeter Set the digital multimeter to measure a DC v
53. CR ER BERE Rea 10 Verification Procedure ce bue der PRU pRbTRRXe rbd amm erai 10 THM420 Adjustment Procedures 0 cece cece eee eeee 17 Preparation for Adjustment 0 te dreis cece eee eee 17 Adjustment Procedure 2 46 ole e I Me yd ede da eR wee RASS les 19 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service fn AENNNNNNNNNNNMNNNMNNMNMNMNMgMgs2 THM420 Digital Multimeter The Tektronix THM420 multipurpose instrument combines the functions of a digital multimeter with the ability to display waveforms The THM420 includes the following features m 3 digits 4000 count LCD display with bargraph m Waveform display with the press of a button m A variety of measurement functions DC AC voltage DC AC current resistance frequency diode testing continuity checking m True RMS measurements W Autoranging for DMM and waveform display Measurement hold m Input overvoltage and overcurrent warning beeper TEKWAVEMETER METER AUTO DC AC SCOPE Ea C JC oC RUN HOLD PRINT LIGHT TRUE RMS AUTO POWER OFF A mA 8A Him CAT FUSED 350V ED 600V 10A for 2 min COM V Q Hz Figure 1 THM420 instrument Bench Test Instruments and Handheld Oscilloscopes Basic Service 1 THM420 Digital Multimeter 2 Bench Test Instrume
54. DEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Repeat steps 2 through 11 of the Outputs 1 and 2 procedure above Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Press OVP SET set the OVP to 7 1 V Verify that the power supply readouts display the error message Err 065 Press OVP SET again set the OVP to 7 V Verify that power supply readouts display no error message Set up the power supply as follows VOLTS SET 4V CURRENT SET LA OVP SET 5V Press STEP SET Set the VOLTS SET to 0 02 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service 41 PS2520 and PS2521 Series Performance Verification 42 Constant Voltage Load Accuracy 10 11 Press VOLTS A to increase the power supply output voltage until the error message Err 013 appears on the readouts Verify that this event occurs between 4 3 and 5 7 V Press SHIFT OVP RESET Reset the output voltage to 4 V Repeat steps 6 through 9 above as necessary to determine the exact voltage Press OUTPUT ON OFF Verify that the OUT indicator t
55. Figure 10 Crosstalk between scope channels test setup On the THM500 series instrument press the POSITION SCALE button until the readout shows SCALE in the lower right corner Use the 4 and v buttons to set the CH 1 vertical scale to 500 mV div and the lt and gt buttons to set the time base to 200 ps div Use the THM500 series instrument menus to set the sampling mode to SPIKE DETECT then remove the menus from the display Adjust the leveled sine wave generator to display five divisions peak to peak at 5 MHz NOTE The 5 MHz waveform is aliased and appears untriggered Press the THM500 series instrument WAVEFORM ON OFF button to turn the CH 1 waveform display off Press the THM500 series instrument SELECT button to select CH 2 Press the WAVEFORM ON OFF button to turn on channel 2 Press the POSI TION SCALE button to show SCALE then use the A and Y buttons to set the vertical scale to 50 mV div Verify that the peak to peak signal displayed on the THM500 series instrument channel 2 is less than 0 5 divisions 25 mVp p Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS500 Series Performance Verification DC Offset The following check assesses the DC offset 1 Use the THM500 series instrument menus to select RESET ALL This sets the vertical position to zero 2 Return the THM500 series instrument to SCOPE mode 3 Use the THM500 series instrument UTILITY menu t
56. Figure 8 for the adjustment locations Set the VERTICAL MODE to CH2 and repeat step 2 for CH 2 Channel 2 Inverted Use the following procedure to adjust the channel 2 inverted balance and Balance and Position position center Center 1 Set up the oscilloscope as follows VERTICAL MODE CH2 CH 2 GND In Position the trace on the center horizontal graticule line using the CH 2 VERTICAL POSITION control Bench Test Instruments and Handheld Oscilloscopes Basic Service 31 TAS 200 Series Adjustment Procedures 32 ADD Mode Balance Vertical Gain Set the CH 2 VERTICAL INVERT push switch to the in position and note the new trace location On the Main board adjust VR213 to position the trace half way back to the center horizontal graticule line See Figure 8 for the adjustment location Set the channel 2 VERTICAL INVERT push switch to the out position If the trace shifts adjust VR303 to return the trace to the center horizontal graticule line Repeat steps 3 through 6 to obtain a minimal trace shift lt 1 division when you toggle the CH 2 VERTICAL INVERT push switch in and out Use the following procedure to adjust the ADD mode balance 1 Set up the oscilloscope as follows VERTICAL MODE BOTH CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 GND In Position both traces on the center horizontal graticule line using the CH 1 and CH 2 VERTICAL POSITION controls Set the VERTICAL MODE cont
57. HORIZONTAL SEC DIV setting listed in Table 16 16 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verification Trigger Check Table 16 X10 MAG time base accuracy HORIZONTAL Time marker Time mark to graticule over SEC DIV setting center 8 divisions 10 ns 10 ns 0 64 division 20 ns 20 ns 0 64 division 50 ns 50 ns 0 64 division 12 Set the oscilloscope HORIZONTAL X10 MAG push switch to the off position out The following check verifies the trigger accuracy of your oscilloscope 1 Use the 50 Q precision coaxial cable to connect the output of the leveled sine wave generator to the 50 Q termination then connect the 50 Q termination to the TAS 200 series instrument CH 1 input See Figure 5 below Sine Wave Generator Precision Cable 50 Q Termination Figure 5 Trigger level check setup 2 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 VOLTS DIV 1V CH 1 AC DC DC CH 1 GND Out release HORIZONTAL SEC DIV 5 us TRIGGER MODE AUTO TRIGGER LEVEL Midway Bench Test Instruments and Handheld Oscilloscopes Basic Service 17 TAS 200 Series Performance Verification TRIGGER COUPLING DC TRIGGER SET TO 50 Out release 3 Set the leveled sine wave generator to produce a five division output at the low frequency trigger level listed for your instrument See Table 17 Table 17 DC coupled triggering sensitivity Minim
58. LTS V7 to adjust the power supply output voltage until the DMM reads 40 000 VDC Verify that the power supply VOLTS readout indicates between 19 965 and 20 035 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 2 and OUTPUT 1 terminals Verify that the DMM reads between 0 1498 and 0 2500 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Parallel Operation Use the following steps to check the parallel mode accuracy 1 2 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Set up the power supply as follows VOLTS SET 20V OVP SET 22V Press STEP SET Set the VOLTS SET to 0 05 V Ensure that the power supply output is disabled Configure the DMM to measure 25 VDC across the power supply front panel OUTPUT 2 terminals Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 19 965 and 20 035 VDC Press VOLTS A or VOLTS V7 to adjust the power supply output voltage until the DMM reads 20 00 VDC Bench Test Instruments and Handheld Oscilloscopes Basic Service 37 PS2520 and PS2521 Series Performance Verification 38 Current Set Accuracy 10 11 12 13 14 Verify t
59. N OFF Verify that the OUT indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 7 Press VOLTS A to increase the power supply output voltage until the error message Err 013 appears on the readouts Verify that the readouts indicate between 4 3 and 5 7 V prior to error message activation 8 Press SHIFT gt OVP RESET 9 Reset the output voltage to 4 V 10 Repeat steps 6 through 9 above as necessary to determine the exact voltage 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off Constant Voltage Complete the following procedures to verify constant voltage load accuracy Load Accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Press SHIFT gt OUT 1 verify that the 1 indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 2 for details Power suppl Electronic load Digital multimeter ud Figure 2 Constant voltage load test setup 3 Setthe DMM to measure 40 VDC 4 Set up the power supply as follows VOLTS SET 36V CURRENT SET 1 55 A OVP SET 38 5 V 5 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 6 Enable the electronic load
60. OCP ON OFF to enable the OCP Verify that the OCP indicator lights up on the display Press OCP ON OFF Verify that the OCP indicator turns off Press SHIFT SERIES INDEP to configure the power supply outputs for series operation Verify that the SERIES indicator lights up on the display Press SHIFT PARA INDEP to configure the power supply outputs for parallel operation Verify that the PARA indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 5 Press SHIFT PARA INDEP again to reconfigure the outputs for indepen dent operation Verify that the PARA and SERIES indicators turn off Set GPIB Use the following steps to check the GPIB address L 2 3 Press LOCAL Enter a GPIB address lt 0 to 30 gt and press Press SHIFT ADDRESS Verify that the address entered in step 2 above appears on the readout for about one second Voltage Set Accuracy Complete the following procedures to verify voltage setting and readout accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 9 10 11 12 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 20V OVP SET 22 V Press STEP SET Set the VOLTS SET to 0 05 V Ensure that the power supply o
61. OUTPUT ERVOLTAGE RON OVP RESET LJ C OUTI OUT OVERCURRENT POWER HEE E m A non x SET CURRENT eueut u ouu 2 OUTPUT 3 Eo G 0 6V EN E 5A Q OO OO ooa G 0 SLAVE MASTER Figure 1 PS2521G power supply Bench Test Instruments and Handheld Oscilloscopes Basic Service 1 PS2520 and PS2521 Series Power Supplies The descriptions and procedures in the following sections apply to all PS2520 series power supplies unless specifically noted with the following exceptions m The PS2520 and PS2520G power supplies have two variable outputs providing 0 to 36 V at 0 to 1 5 A and one variable output providing 0 to 6 V at 0 to 3A m The PS2521 and PS2521G power supplies have two variable outputs providing 0 to 20 V at 0 to 2 5 A and one variable output providing 0 to 6 V at 0 to 5 A m The PS2520G and PS2521G include General Purpose Interface Bus GPIB operation 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service SPT gaa aaa PS2520 and PS2521 Series Specifications The characteristics listed in this section apply under the following conditions m The power supply operates in a 20 to 30 C 68 to 86 F ambient environment unless otherwise noted m The instrument warms up for at least 20 minutes NOTE All specifications are warranted unless marked typical Typical characteristics are not guaranteed but are provided for the convenience of the u
62. Portable Oscilloscope 070 6367 00 2252 Portable Oscilloscope 070 7838 01 2335 Oscilloscope 070 4116 00 2336 Oscilloscope 070 4118 00 2336YA Oscilloscope 070 5011 00 2337 Oscilloscope 070 4120 00 TAS 455 465 Oscilloscope 070 8524 02 TAS 465 Oscilloscope 070 9403 00 TAS 475 485 Oscilloscope B010100 to B020099 070 8878 01 B020100 and above 070 9404 00 TDS 210 220 Oscilloscope 070 9693 01 TDS 310 320 350 Oscilloscope 070 8570 05 TDS 340 340A 360 380 Oscilloscope 070 9435 02 THS 710 720 730 Oscilloscope 070 9246 03 ii Bench Test Instruments and Handheld Oscilloscopes Basic Service ce aaa General Safety Summary To Avoid Fire or Personal Injury Review the following safety precautions to avoid injury and prevent damage to the products in this manual or any products connected to them To avoid potential hazards use these products only as specified Only qualified personnel should perform service procedures While using these products you may need to access other parts of the system Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system Use Proper Power Cord To avoid fire hazard use only the power cord specified for the product you are using Use Proper Voltage Setting Before applying power ensure that the line selector is in the proper position for the power source being used Connect and Disconnect Properly Do not connect or disconnect probes or test leads wh
63. S2520 and PS2521 Series Adjustment Procedures 11 12 13 14 15 16 17 18 19 Enter the DMM reading on the power supply keypad and press lt 2 Verify that the power supply readout displays cL20 indicating current offset calibration Configure the DMM to measure 2 amperes DC Enter the DMM reading on the power supply keypad and press Verify that the power supply readout displays cL2F indicating that the current offset calibration is complete Set the DMM to the 10 A range and press on the power supply Verify that the power supply readout displays cL21 indicating current full scale calibration Enter the DMM reading on the power supply keypad and press Verify that the power supply readout displays cL2F indicating that the current full scale calibration is complete Disconnect the DMM from the power supply Press lt 4 on the power supply and verify that the readout displays cL30 indicating overvoltage protection offset calibration Wait 10 seconds and verify that the readout displays cL31 indicating that the overvoltage protection full scale calibration is running Wait another 10 seconds for the readout to return to normal The calibration is complete Partial Calibration See Table 10 for a list of partial calibrations then proceed with the following steps NOTE Do not remove the instrument cover unless you intend to perform a voltage full scale calibration Select the
64. SI 8 Constant Current Load Regulation Check sseeee esses 9 Constant Current Ripple and Noise Check 0 0000 eee eee eee 11 Constant Voltage Regulation Check 0 0 0 0 cee cece ee eee 13 PS280 and PS283 Adjustment Procedures 15 Listof AdJUSBebBis se disp cn soe eS a ee ERREUR dpa ut Se dida 15 Test EQUIPMENT 4 4 ni pea iad te ove dan dat on bes ofr aie bade dans 16 Preparation for Adjustment 0 cece cece eee eee 16 Independent Mode Adjustments 0 00 02 cece eee eee 19 Series Tracking Mode Adjustments 2 0 00 cece eee eee eens 21 Parallel Tracking Mode Adjustments 0 000 000 0 2 e eee eee ee 22 5 V Fixed Output Adjustments 0 eect eee 23 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Table of Contents ii Bench Test Instruments and Handheld Oscilloscopes Basic Service Ur LS PS280 and PS283 Power Supplies The Tektronix PS280 and PS283 Laboratory DC Power Supplies are multifunc tion benchtop or portable instruments These regulated triple output power supplies provide one fixed 5 V 3 A output suitable for powering logic circuits and two variable 0 to 30 V outputs useful in a wide variety of test and exper imental uses The current output of the PS280 varies from 0 to 2 A The current output of the PS283 varies from 0 to 1 A In all other respects the instruments are identical Unless otherwise noted descrip
65. Safety Summary before performing any service procedures Do Not Service Alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock disconnect the main power by means of the power cord or if provided the power switch Use Caution When Servicing the CRT To avoid electric shock or injury use extreme caution when handling the CRT Only qualified personnel familiar with CRT servicing procedures and precautions should remove or install the CRT CRTs retain hazardous voltages for long periods of time after power is turned off Before attempting any servicing discharge the CRT by shorting the anode to chassis ground When discharging the CRT connect the discharge path to ground and then the anode Rough handling may cause the CRT to implode Do not nick or scratch the glass or subject it to undue pressure when removing or installing it When handling the CRT wear safety goggles and heavy gloves for protection Use Care When Servicing With Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections X Radiation To avoid x radiation exposure do not modify or otherwise alter the high voltage circuit
66. TPUT 3 on the rear of the instrument Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Disconnect the DMM and electronic load from the instrument Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification Constant Voltage Complete the following procedures to verify constant voltage source accuracy Source Accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Setup the Variac Connect the power supply AC input to the Variac variable output Allow 20 minutes for the power supply to warm up and stabilize 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 3 for details Power suppl Electronic load Digital multimeter da Figure 3 Constant voltage source test setup 3 Set the DMM to measure 40 VDC 4 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display 5 Set up the power supply as follows VOLTS SET 36V CURRENT SET 1 55 A OVP SET 38 5 V 6 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 7 Enable the electronic load Adjust the load unti
67. Technical Reference Tektronix 7 Bench Test Instruments and Handheld Oscilloscopes Basic Service 061 4124 01 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service www tektronix com Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and TEK are registered trademarks of Tektronix Inc C 0 Service Reference This manual contains the Performance Verification and Adjustment procedures for many benchtop products Table i lists the products supported by this manual Table i Benchtop and handheld products supported by this manual Products PS280 and PS283 Power Supplies PS 2520 PS2520G PS2521 and PS2521G Power Supplies TAS 210 and TAS 220 Digital Oscilloscopes TMM 420 Digital Multimeter THM500 Series Multimeter S cope Service information of products not provided in this manual may be available under separate cover Table ii provides a list of many handheld and benchtop instruments and their service documentation Table ii Handheld and benchtop instruments service man
68. V 40 V 30 00 V 1kHz 29 50 V 30 50 V 400 V 300 0 V 1kHz 295 0 V 305 0 V 1kHz 438 V 462 V 600 V 450 V 4 Disable the voltage source output 5 Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service 11 THM420 Performance Verification Resistance The following check verifies resistance measurement accuracy 1 Turn the THM420 rotary switch to Q 2 Connect the resistance source output to the THM420 COM and the V Q Hz gt input connectors 3 Set the controls of the THM420 and the resistance source to each of the values listed in Table 11 then verify that the THM420 readout remains within the readout limits Table 11 Ohms accuracy Readout limits THM420 range Resistance source Minimum Maximum 400 O 100 0 Q 100 8 Q 400 kO 100 0 KQ 100 6 kO 40 MQ 10 00MQ 9 80 MQ 10 20 MQ 4 Disconnect the test setup Diode and Continuity The following check verifies diode and continuity measurement accuracy 1 Turn the THM420 rotary switch to and 2 Connect the THM420 COM input to the V Q Hz input with a shorting strap 3 Verify that the THM420 readout indicates approximately 0 000V and the beeper sounds 4 Disconnect the test setup Frequency The following check verifies frequency measurement accuracy 1 Turn the THM420 rotary switch to Hz 2 Connect the frequency source output to the THM420 COM and the V Q Hz input connectors 3 Set the c
69. VOLTAGE control until the multimeter reads 25 VDC 6 Disconnect the digital multimeter from the power supply 7 Set the digital multimeter to measure a DC current of at least 1 A PS280 or 0 5 A PS283 8 Connect the digital multimeter and load resistors to the and terminals of the power supply MASTER output as shown in Figure 2 See Table 7 for the appropriate load resistor values 9 Verify that the power supply output current varies less than 0 2 3 mA while shunting load resistor RL1 with the shorting strap See Figure 2 above Bench Test Instruments and Handheld Oscilloscopes Basic Service 9 PS280 and PS283 Performance Verification SLAVE Current Regulation INDEP Mode MASTER Current Regulation PARALLEL Mode 10 Table 7 Load resistor values for current checks 200 30W 20 5W 20 Q 30 W 10 Q 30 W 10 Q 30 W INDEP PARALLEL 1Q 30 W The following check verifies the INDEP mode SLAVE current regulation performance 1 Set the power supply SLAVE AMPS VOLTS meter selection switch to AMPS 2 Set up the digital multimeter to measure 25 VDC 3 Connect the digital multimeter to the and terminals of the power supply SLAVE output 4 Adjust the power supply SLAVE VOLTAGE control until the multimeter reads 25 VDC 5 Disconnect the digital multimeter from the power supply 6 Setthe digital multimeter to measure a DC current of at least 1 A PS280 or 0 5 A PS283 7 C
70. Verification Test Equipment The performance verification procedures use external traceable test equipment to directly check warranted characteristics Alternative test equipment must meet or exceed the intended minimum requirements If you substitute equipment you may need to modify the performance verification procedures NOTE Before beginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations Table 11 Performance verification test equipment Description Minimum requirements Example product Leveled Sine Wave Generator 200 kHz to 250 MHz variable amplitude Wavetek 9100 Universal Calibration from 5 mV to 4 V into 50 Q System with Oscilloscope Calibration Time Mark Generator Variable marker frequency from 10 ms to Module Option 250 10 ns accuracy within 2 ppm Fluke 5500A Multi product Calibrator with DC Calibration Generator DC voltage levels from 100 mV to 10 V Oscilloscope Calibration Option 5500A 5C Digital Multimeter 35 V 4A 0 1 Accuracy Tektronix DMM914 Digital Multimeter Termination two required 50 Q female BNC input male BNC output Tektronix 011 0049 01 Cable Coaxial 75 Q male to male BNC connectors Tektronix 012 1338 00 36 inch length Cable Precision Coaxial 50 Q male to male BNC connectors Tektronix 012 0482 00 36 inch length 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verif
71. age Err 013 appears on the readouts Verify that this event occurs between 34 68 and 37 32 V 8 Press SHIFT gt OVP RESET 9 Reset the output voltage to 34 5 V 10 Repeat steps 6 through 9 above as necessary to determine the exact voltage 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off 12 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 13 Repeat steps 2 through 11 above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 With the power supply still set to OUT 2 press SHIFT gt PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display 2 Repeat steps 2 through 11 of the Outputs 1 and 2 procedure above 3 Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display 2 Press OVP SET set the OVP to 7 1 V Verify that the power supply readouts display the error message Err 065 3 Press OVP SET again set the OVP to 7 V Verify that power supply readouts display no error message 4 Set up the power supply as follows VOLTS SET 4V CURRENT SET LA OVP SET 5V 5 Press STEP SET Set the VOLTS SET to 0 02 V 6 Press OUTPUT O
72. ain board viewed from the instrument top 30 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures DC Balance Use the following procedure to adjust the DC balance 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH2 CH 1 CH 2 VERTICAL VARIABLE CAL CH 1 CH 2 GND In On the oscilloscope Main board adjust VR101 VR201 for a minimal trace shift when switching the front panel CH 1 CH 2 VOLTS DIV control between 5 mV and 10 mV See Figure 10 for the adjustment locations Verify that the trace shift is less than 0 5 divisions for each CH 1 CH 2 VOLTS DIV step between 5 mV and 5 V On the Main board adjust VR104 VR204 for minimal trace shift when switching the CH 1 CH 2 VOLTS DIV control between 2 mV and 10 mV See Figure 8 for the adjustment locations Verify that the trace shift is less than two divisions when switching the VOLTS DIV control between 1 mV and 2 mV Set the VERTICAL MODE to CH2 and repeat steps 2 through 5 for CH 2 Variable DC Balance Use the following procedure to adjust the variable DC balance 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH2 CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 GND In On the Main board adjust VR106 VR206 for a minimal trace shift while rotating the front panel CH 1 CH 2 VARIABLE control between the fully clockwise and the fully counterclockwise positions See
73. ation and polarities shown in Figure 2 Perform steps 5 through 8 of the Outputs 1 and 2 procedure above Bench Test Instruments and Handheld Oscilloscopes Basic Service 43 PS2520 and PS2521 Series Performance Verification 44 4 Verify that the difference between V1 and V2 is lt 50 mV 5 Press OUTPUT ON OFF Verify that the OUT indicator turns off 6 Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 and OUTPUT 1 terminals and connect them to the rear panel OUTPUT 2 and OUTPUT 1 terminals Maintain the equipment configuration and polarities shown in Figure 2 7 Repeat steps 5 through 8 of the Outputs 1 and 2 procedure above and verify that the difference between V1 and V2 is lt 50 mV 8 Press OUTPUT ON OFF Verify that the OUT indicator turns off 9 Disconnect the DMM and electronic load from the instrument Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 2 3 Setthe DMM to measure 25 VDC 4 Set up the power supply as follows VOLTS SET 20V CURRENT SET 5 1A OVP SET 22V
74. check verifies the SLAVE current ripple 1 12 Set the power supply to INDEP operating mode by disengaging both TRACKING switches both switches out Set the power supply SLAVE AMPS VOLTS meter switch to VOLTS Set the power supply to 25 VDC using the digital display Connect the test oscilloscope and load resistors to the and terminals of the SLAVE output as shown in Figure 3 See Table 8 for the appropriate load resistor values Verify that the peak to peak ripple viewed on the oscilloscope is less than 3 mV Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Performance Verification Constant Voltage Regulation Check MASTER Voltage Regulation To check the constant voltage regulation of your power supply perform the following tests Power supply DMM Figure 4 Constant voltage test setup The following check verifies the MASTER voltage regulation performance Set the power supply to the INDEP operating mode by disengaging both TRACKING mode switches both switches out Set up the digital multimeter to measure 60 VDC Connect the digital multimeter and load resistors to the and terminals of the power supply MASTER output as shown in Figure 4 See Table 9 for the appropriate load resistor values Verify that you can adjust the power supply from 0 to 30 V Set the power supply to the SERIES operating mode by engaging the left TRACKING mo
75. commended or equivalent test equipment specified in Table 6 on page 8 If you substitute equipment always choose instruments that meet or exceed the minimum requirements NOTE Before making any adjustment warm up the test equipment according to the manufacturer s recommendations Preparation for Adjustment Remove Instrument Cover 16 ZN The following guidelines apply to all PS280 and PS283 power supply adjust ments W Perform the adjustments in a 20 to 30 C 68 to 104 F ambient environment with a relative humidity of 75 or less m Before making any adjustment warm up the instrument for at least 20 minutes m Read the Safety Summary at the beginning of this manual M Do not alter any setting without reading the entire adjustment procedure first M Do not alter any setting unless a performance characteristic cannot be met at the current setting You must remove the instrument cover to make internal adjustments WARNING To avoid electrical shock disconnect the power cord from its source while removing the instrument cover Following the adjustment procedure replace the instrument cover before using the power supply To remove the instrument cover refer to Figure 5 while performing the following steps 1 Remove the two handle mounting screws and remove the handle 2 Remove the three screws on the left side and the three screws on the right side of the instrument 3 Slide the cover toward t
76. criptions see your User manual Basic Function Complete the following procedures to verify basic instrument function Outputs 1 2 and 3 Use the following steps to verify OUTPUT 1 OUTPUT 2 and OUTPUT 3 basic function 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 10 V CURRENT SET 1A OVP SET 38V DELAY 3s Press SHIFT STORE gt 1 to store the above values in the memory 01 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values listed in step 2 for memory location 01 Reset the power supply as follows VOLTS SET 11V CURRENT SET 1 1A OVP SET 38 V DELAY 3s Press SHIFT STORE gt 2 to store the above values in the memory 02 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values listed in step 4 for memory location 02 Press SHIFT RECALL then enter 1 2 lt Press RECALL LAST verify that the readouts display the data stored in the memory 02 location Bench Test Instruments and Handheld Oscilloscopes Basic Service 9 PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 15 16 17 18 Press RECALL LAST again verify that the readouts now display the data stored in the memory 01 location Press RECALL NEXT verify that the readouts display the data stored in the memory 02 location Press OUTPUT ON OFF Veri
77. ct the digital multimeter to the and terminals of the MASTER output and note the reading obtained 11 Connect the digital multimeter to the and terminals of the SLAVE output 12 Adjust VR501 Front Panel Controls circuit board until the voltage of the SLAVE output matches the reading obtained from the MASTER output in step 10 above 13 Recheck the value of the MASTER output compared to the value of the SLAVE output Readjust VR501 if the outputs do not match 14 Disconnect the test setup VR501 J 3082 Figure 9 Front Panel Controls circuit board adjustments Parallel Tracking Mode Adjustments 22 PARALLEL Tracking Refer to Figures 6 and 7 for the circuit board and adjustment locations used in this procedure To adjust the PARALLEL tracking Mode perform the following steps 1 Disengage both TRACKING mode switches both switches out so that the power supply is in the INDEPendent operating mode 2 Set the MASTER VOLTAGE and CURRENT controls to minimum fully counterclockwise 3 Set the digital multimeter to measure a DC current of 4 A 4 Connect the digital multimeter to the and terminals of the MASTER output 5 Set the MASTER VOLTAGE control to midrange and adjust the MASTER CURRENT control until a reading of 1 A PS283 or 2 A PS280 is displayed on the multimeter Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Adjustment Pr
78. ction accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Press OVP SET and set the OVP to 22 6 V Verify that the power supply readouts display the error message Err 065 Press OVP SET again and set the OVP to 22 5 V Verify that the power supply readouts display no error message Set up the power supply as follows VOLTS SET 18 V CURRENT SET LA OVP SET 20V Press STEP SET Set the VOLTS SET to 0 02 V Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Press VOLTS A to increase the power supply output voltage until the error message Err 013 appears on the readouts Verify that this event occurs between 19 00 and 21 00 V Press SHIFT gt OVP RESET Reset the output voltage to 18 V Repeat steps 6 through 9 above as necessary to determine the exact voltage Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Repeat steps 2 through 11 above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 With the power supply still set to OUT 2 press SHIFT PARA IN
79. de switch switch in and disengaging the right TRACKING mode switch switch out Verify that you can adjust the power supply from 0 to 60 V Set the power supply to the PARALLEL operating mode by engaging both TRACKING mode switches both switches in Verify that you can adjust the power supply from 0 to 30 V Bench Test Instruments and Handheld Oscilloscopes Basic Service 13 PS280 and PS283 Performance Verification SLAVE Voltage Regulation 5 V Fixed Voltage Regulation 14 Table 9 Load resistor values for voltage checks PS280 PS283 Mode RL RL INDEP 15 O 70W 30 Q 40 W SERIES 30 Q 140 W 60 Q 70 W PARALLEL 7 5 Q 140 W 15 Q 70 W 5V FIXED 1 7 Q 20 W 1 7 Q 20 W The following check verifies the SLAVE voltage regulation performance 1 Set the power supply to the INDEP operating mode by disengaging both TRACKING mode switches both switches out Set up the digital multimeter to measure 30 VDC Connect the digital multimeter and load resistors to the and terminals of the SLAVE output as shown in Figure 4 See Table 9 for the appropriate load resistor values Verify that you can adjust the power supply from 0 to 30 V The following check verifies the 5 V fixed voltage regulation performance Set up the digital multimeter to measure 5 VDC Connect the digital multimeter and load resistors to the 5V FIXED 3A terminals Use the test setup illustrated in Figure 4 See Table 9 for the appropr
80. drange 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 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures 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 voltages present can cause a fatal injury WARNING Use extreme caution when adjusting the power supply The high Test points gt Figure 7 Power and High Voltage board viewed from the instrument bottom 12 V Supply Use the following procedure to adjust the 12 V power supply 1 ia Instrument front 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 ASTIG FREQ ADJ amp VR604 VR701 SUB INTENSITY VR603 SUB FOCUS 12V ADJ VR602 VR601 000000 00000 Verify that the voltmeter reads between 411 95 and 12 05 V If the r
81. e should disappear Use the following procedure to adjust the display focus and astigmatism 1 Set the front panel FOCUS control to midrange then adjust VR602 on the Power and High Voltage board to obtain the best focus See Figure 7 for the adjustment location Set the front panel HORIZONTAL X Y push switch to the in position Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures 3 Rotate the front panel HORIZONTAL POSITION control to move the 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 Bench Test Instruments and Handheld Oscilloscopes Basic Service 29 TAS 200 Series Adjustment Procedures Vertical Adjustments To locate the adjustments for the following procedures refer to Figures 8 9 and 10 The Main board occupies the bottom right side of the instrument VR303 VR112 VR108 VR110 VR109 G VR107 amp VC106 C9 VC206 VR113 vR207 VR104 VR213 VR100 G amp VC105 VR206 VR204 Q G VR103G VC205 VR102 amp VR203 VR202 Instrument front U Figure 8 M
82. e the following steps to check the OUTPUT 3 accuracy 1 2 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 5 Set up the power supply as follows VOLTS SET 6V CURRENT SET 5 0A OVP SET 7N Repeat steps 5 through 18 of the Outputs 1 and 2 procedure above Disconnect the DMM and electronic load from the instrument Complete the following procedures to verify constant current source accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Set up the Variac Connect the power supply AC input to the Variac variable output Allow 20 minutes for the power supply to warm up and stabilize Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 2 Ensure that the power supply output is disabled Connect the DMM and 27 Q 75 W resistor to the front panel OUTPUT 1 terminals See Figure 6 for details Digital multimeter Power supply E Resistor l Figure 11 Constant current source test setup 3 Set the DMM to measure 5 amperes DC 4 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display 5 Set up the power supply as follows VOLTS SET 20V CURRENT SET
83. eading is within these limits go to step 4 Adjust VR601 for a voltmeter reading of 12 V See Figure 7 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service 27 TAS 200 Series Adjustment Procedures 28 Intensity Focus and Astigmatism 4 Verify that the voltage levels in Table 21 are within the specified limits See Figure 7 for the test point locations Table 21 Power supply limits Power supply Test point Limits volts 12 12 11 95 to 12 05 12 12 11 80 to 12 20 5 5 4 15 to 45 25 185 TAS 220 185 180 to 190 145 TAS 250 145 140 to 150 NOTE If a power supply measurement exceeds the limits specified in Table 21 discontinue the adjustment procedures Contact a Tektronix service center for instrument repair 5 Disconnect the voltmeter from the instrument Use the following procedure to adjust the display intensity 1 Set up the oscilloscope as follows HORIZONTAL SEC DIV 1 ms TRIGGER HOLDOFF NORM Rotate the front panel INTENSITY control to the fully counterclockwise position then rotate the control clockwise to the 90 nine o clock position Locate VR603 on the Power and High Voltage board see Figure 7 for the adjustment location Adjust VR603 until the trace is barely visible Rotate the INTENSITY control clockwise Verify that the trace becomes brighter Rotate the INTENSITY control fully counterclockwise the trac
84. ent perform the following steps 1 Verify that the PARA indicator lights up on the display 2 Enter the DMM current reading on the power supply keypad and press The readout will return to normal when the calibration is complete Bench Test Instruments and Handheld Oscilloscopes Basic Service Instructions Manual Tektronix f TAS 200 Series Oscilloscopes 070 9855 01 OO A OE Table of Contents TAS 200 Series Oscilloscopes ccc cece cee ee ee eee eee 1 TAS 200 Series Specifications 0 ccc cece eee ee ee eens 3 TAS 200 Series Performance Verification eese 7 Test Equipttient cioe ari Ra edie dee eka eek RREETR EE Re Vs 8 Jour 9 Vertical Check mre eer rd rar RR AIR RAIN EE NR EUER Dd RE 10 Horizontal Check 45 o she aes ahd ue Sce aedes OR Cn ER Ge aye a 15 TrepgerCheck 22b be pA er Rages Bed weeds ded ovate 17 Cursor Check 55d pee Tito Ere EENE SW Rta Edy Ske Ady ddr 19 TAS 200 Series Adjustment Procedures 21 List of Adjustments 2 2 0 0 ee eee eee m eens 21 Test Equipment s 02sskeis5n0ieGs ties oe e Pede Iu IE WIS E 23 Preparation for Adjustment llssslsessseslee tenes 24 Power Supply Adjustments ssec esses o e bdes wees STETE EEEE TES 27 Vertical Adjusiments cvs iyd hus RoNaS kG es geese BEES TRY ER 30 Horizontal Adjustments 3 655 ed RED E gles o TEN SPENTE es 37 Trigger Adjustments 322p exse runot YE ks es eres BETS ERIT 40
85. es Autorange Typical Autorange mode positions and sets the vertical and horizontal scales to between 30 and 60 of full screen After 500 ms the process repeats if the signal amplitude or period changes The lower limits of Autorange are 50 mV div and 100 ms div Autorange is the default mode Manual The scope switches to manual operation when any control alters the waveform display Line Test m Will monitor a 45 to 65 Hz power waveform on CH 1 and check for variations in amplitude and frequency Abnormal events such as spikes drop outs and substantial frequency variations will be captured and counted m Automatic print of failures m Automatic screen save on failures m Time and date stamp on failure Motor Test Will stabilize trigger on pulse width modulated signals generated by variable speed AC motor drives Vertical Channels Each channelis identical 2 Probe Interface Shrouded banana jack Accepts 4 mm caged spring safety style banana plug e Use probes incorporating 9 leaf spring contacts only VolsDhison ang Smvivias00vivinaiasseqene DII s mimm ee Pun pciccomioWsmme e e hputimpeance bcowesr mp epp Analog Bandwidth 5 mV div DC to 1 MHz e 10 mV div to 2 V div DC to 5 MHz 5 to 500 V div DC to 1 MHz Maximum Input Voltage 600 Vams e jo o DC Accuracy AV 3 5 2 pixels 19 to 27 C derate by 0 25 per C outside the range e jo o Derate additional 0 5 at5 mV di
86. est Instruments and Handheld Oscilloscopes Basic Service ee aa TAS 200 Series Performance Verification This section contains procedures to verify that the TAS 220 and TAS 250 oscilloscopes perform as warranted Verify instrument performance whenever the accuracy or function of your instrument is in question The procedures are organized into four sections Vertical Check Horizontal Check Trigger Check and Cursor Check The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions m The instrument operates in a 20 to 30 C ambient environment m The oscilloscope warms up for at least 20 minutes m 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 The TAS 200 series performance verification consists of the checks listed in Table 10 Table 10 Performance verification checks Vertical Check DC Gain Accuracy DC Coupled Bandwidth DC Balance Variable DC Balance CH 2 Inverted Balance Horizontal Check Time Base Accuracy Trigger Check Trigger Sensitivity Cursor Check AT Measurement Accuracy AV Measurement Accuracy Bench Test Instruments and Handheld Oscilloscopes Basic Service 7 TAS 200 Series Performance
87. et the THM500 series instrument to the range specified in the first column then set the voltage source to the output voltage specified in the second column Verify that the THM5S00 series instrument readout is within the range listed in the third column Table 8 AC voltage accuracy test limits Instrument range AC voltage source at 60 Hz Instrument readout 400 mV 300 mV 293 5 to 306 5 4V 3V 2 935 to 3 065 40 V 30V 29 35 to 30 65 400 V 300 V 293 5 to 306 5 600 V 500 V 485 to 515 4 Setthe calibrator output to a safe voltage less than 20 V and disconnect the THM500 series instrument from the calibrator 5 Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service 13 THM500 Series Performance Verification Resistance Accuracy The following check verifies resistance accuracy 1 Set the THMS500 series instrument to METER mode displaying Q Connect the THM500 series instrument to the resistance source as shown in Figure 3 50 Q cable O BNC to dual banana cable gt Resistance source BNC to dual banana cable Figure 3 Resistance accuracy test setup 2 For each row of Table 9 use the A and V buttons to set the THM500 series instrument to the range specified in the first column then set the resistance source to the resistance specified in the second column Verify that the THM500 series instrument readout is within the range lis
88. et the digital multimeter to measure a DC current of 2 A Connect the digital multimeter to the and terminals of the SLAVE output Set the SLAVE CURRENT control to maximum fully clockwise Disconnect the digital multimeter from the power supply Series Tracking Mode Adjustments Refer to Figures 6 7 and 9 for the circuit board and adjustment locations used in this procedure SERIES Tracking To adjust the series tracking mode perform the following steps 1 PF amp m Engage the left TRACKING mode switch switch in and disengage the right TRACKING mode switch switch out so that the power supply is in the SERIES operating mode Set the SLAVE CURRENT control to midrange Set the MASTER VOLTAGE control to near minimum counterclockwise Set the digital multimeter to measure a low DC voltage Connect the digital multimeter to the and terminals of the MASTER output and adjust the MASTER VOLTAGE control until the digital multimeter reads 500 mV Connect the digital multimeter to the and terminals of the SLAVE output Adjust VR306 Master Slave circuit board until the voltage output of the SLAVE output matches the reading obtained from the MASTER output Set the MASTER VOLTAGE control to maximum fully clockwise Set the digital multimeter to measure a DC voltage of 35 V Bench Test Instruments and Handheld Oscilloscopes Basic Service 21 PS280 and PS283 Adjustment Procedures 10 Conne
89. etup 10 11 Set up the oscilloscope to measure 100 mV AC coupled Set up the power supply as follows VOLTS SET 36V CURRENT SET 1 55 A OVP SET 38 5 V Press OUTPUT ON OFF Verify that the C V indicator lights up on the display Using a 0 1 uF ceramic capacitor to decouple the test points adjust the oscilloscope and verify that the noise is X30 mVp p Set the oscilloscope to LINE trigger source Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the ripple changes lt 3 mV over the adjustment range Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 4 Repeat steps 4 through 8 above Outputs 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 2 Ensure that the power supply output is disabled Connect the oscilloscope and 2 2 Q 50 W resistor to the front panel OUTPUT 3 terminals See Figure 4 for details 3 Se
90. f the instrument Use the following procedure to adjust the trigger DC offset 1 Set up the oscilloscope as follows CH 1 CH 2 VERTICAL POSITION Midrange VERTICAL MODE CH 1 CH 2 VOLTS DIV CH 1 CH 2 VARIABLE CH 1 CH 2 AC DC HORIZONTAL SEC DIV TRIGGER COUPLING TRIGGER SOURCE CH1 CH2 10 mV CAL AC 1 ms AC CH 1 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 switch positions See Figure 8 for the adjustment location 5 Set the VERTICAL MODE and TRIGGER SOURCE to CH2 and repeat steps 2 through 4 for channel 2 Use the following procedure to adjust the trigger slope balance 1 Set up the oscilloscope as follows VERTICAL MODE CH 1 AC DC CH 1 GND HORIZONTAL SEC DIV CHI AC In 1 ms Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures TRIGGER SET TO 50 In TRIGGER SLOPE Falling push switch in Use a DMM to measure the collector voltage of Q414 Adjust VR403 for a reading of 1 40 V 0 02 V See Figure 10 for the adjustment location Set the CH 1 GND push switch to the out
91. figuration and polarities shown in Figure 3 12 Repeat steps 5 through 9 above Series Operation Use the following steps to check the series mode output accuracy 1 Press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 and OUTPUT 1 terminals Maintain the equipment configuration and polarities shown in Figure 3 Repeat steps 5 through 9 of the Outputs 1 and 2 procedure above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 3 Set the DMM to measure 25 VDC Set up the power supply as follows VOLTS SET 20V CURRENT SET 5 1A OVP SET 22 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 5 000 A Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Ve
92. follows VOLTS SET 6V CURRENT SET 3 0A OVP SET 7N 4 Repeat steps 6 through 8 of the Outputs 1 and 2 procedure above This concludes the PS2520 and PS2520G performance verification procedures Bench Test Instruments and Handheld Oscilloscopes Basic Service 31 PS2520 and PS2521 Series Performance Verification PS2521 and PS2521G Checks 32 Basic Function To verify the performance and function of the PS2521 and PS2521G power supplies implement the following checks in sequential order To verify the performance and function of the PS2520 and PS2520G power supplies see page 9 The test equipment for all verification procedures is listed on page 8 NOTE To clear a memory location enter 0 as the VOLTS SET and CURRENT SET values then save the 0 values to the desired memory location For a list of error code descriptions see your User manual Complete the following procedures to verify basic instrument function Outputs 1 2 and 3 Use the following steps to verify OUTPUT 1 OUTPUT 2 and OUTPUT 3 basic function 1 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display 2 Set up the power supply as follows VOLTS SET 10 V CURRENT SET 1A OVP SET 22 V DELAY 3s 3 Press SHIFT STORE gt 1 to store the above values in the memory 01 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values listed in step 2 for memory location 01 4 Resetthe po
93. fy that the OUT indicator lights up on the display Press AUTO SEQ ON OFF and verify that the AUTO indicator lights up on the display Verify that the front panel readouts alternately display the memory 01 and memory 02 setups from steps 2 and 4 above every three seconds Press AUTO SEQ ON OFF and OUTPUT ON OFF Verify that the AUTO and OUT indicators turn off Press STEP SET Set the VOLTS SET to 1 00 V Press VOLTS V7 and verify that as you attempt to decrease the voltage below 0 00 V Err 018 appears on the CURRENT A and VOLTS readouts The voltage should decrease in 1 volt steps on the VOLTS readout Press VOLTS A and verify that as you attempt to increase the voltage past 37 00 V Err 016 appears on the readouts The voltage should increase in 1 volt steps on the VOLTS readout Press STEP SET Set the CURRENT SET to 1 A Press CURRENT and verify that as you attempt to decrease the current below 0 000 A Err 019 appears on the readouts and the C C indicator lights The current should decrease in 1 ampere steps on the CURRENT A readout Press CURRENT ZA and verify that as you attempt to increase the current past 1 550 A Err 017 appears on the readouts The current should increase in ampere steps on the CURRENT A readout To check the function of OUTPUT 2 press SHIFT OUT 2 Verify that the 2 indicator lights up on the display then repeat steps 2 through
94. ginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations Table 6 Performance verification and adjustment test equipment Description Minimum requirements Example product Oscilloscope 50 MHz 3 vertical deflection accuracy Tektronix TDS 300 Series Oscilloscope Digital Multimeter 35 V 4A 0 1 Accuracy Tektronix DMM914 Digital Multimeter Fixed Resistive Loads 200 30W 100 30W 20 5W 1Q 30W 7Q 140W 05Q 5W 150 70W 30Q 140W 7150 140W 300 40W 600 70W Variable Resistive Load 0to2Q 30W Shorting Strap with Alligator Clips Insulated 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Performance Verification Constant Current Load Regulation Check MASTER Current Regulation INDEP mode To check the constant current load regulation of your power supply perform the following tests Power supply DMM Shorting strap Figure 2 Constant current test setup The following check verifies the INDEP mode MASTER current regulation performance 1 Set the power supply to the INDEP operating mode by disengaging both TRACKING mode switches both switches out 2 Set the power supply MASTER AMPS VOLTS selection switch to AMPS 3 Set up the digital multimeter to measure 25 VDC 4 Connect the digital multimeter to the and terminals of the power supply MASTER output 5 Adjust the power supply MASTER
95. h Oscilloscope Calibration Module Option 250 Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option 5500A SC Tektronix DMM914 Digital Multimeter Tektronix 011 0049 01 Tektronix 012 1338 00 Tektronix 012 0482 00 Tektronix 067 0525 02 Tektronix P 6109B 23 TAS 200 Series Adjustment Procedures Preparation for Adjustment 24 Remove the Instrument Cover A Perform the adjustment procedures on an as needed basis If an oscilloscope section fails a performance requirement or if a section is replaced or repaired adjust only that section Adjusting individual sections of the oscilloscope rarely affects its overall performance In general accurate adjustments require a stable well focused low intensity display Unless otherwise noted adjust the INTENSITY FOCUS and TRIG GER LEVEL controls as needed to view the display In addition to the above the following guidelines apply to all instrument adjustments Perform the adjustments in a 20 to 30 C 68 to 86 F ambient environ ment m Before making any adjustments warm up the instrument for at least 20 minutes W Do not alter a setting unless a performance characteristic cannot be met at the current setting M Do not alter any setting without reading the entire adjustment procedure first m Read the Safety Summary at the beginning of this manual NOTE Altering the 12 V ADJ setting may require a complete readjustment of
96. hat the OUT indicator lights up on the display 6 Verify that the DMM reads between 5 972 and 6 028 VDC 7 Press VOLTS A or VOLTS YW to adjust the power supply output voltage until the DMM reads 6 00 VDC 8 Verify that the power supply VOLTS readout reads between 5 950 and 6 050 V 9 Press VOLTS SET Set the power supply output voltage to 0 1 V 10 Set the DMM to measure 1 VDC across the power supply OUTPUT 3 terminals 11 Verify that the DMM reads between 0 0749 and 0 1250 VDC 12 Press OUTPUT ON OFF Verify that the OUT indicator turns off Series Operation Use the following steps to check the series mode accuracy 1 Press SHIFT gt OUT 2 verify that the 2 indicator lights up on the display 2 Setupthe power supply as follows VOLTS SET 20V OVP SET 22V 3 Press STEP SET Set the VOLTS SET to 0 05 V Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 Ensure that the power supply output is disabled Configure the DMM to measure 50 VDC across the front panel OUTPUT 2 and OUTPUT 1 terminals Press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 39 930 and 40 070 VDC Press VOLTS A or VO
97. hat the power supply VOLTS readout indicates between 19 965 and 20 035 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 2 terminals Verify that the DMM reads between 0 0749 and 0 1250 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Complete the following procedures to verify current setting and readout accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 9 10 11 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 10 V CURRENT SET 2 5 A OVP SET 11V Press STEP SET Set the CURRENT SET to 0 002 A Ensure that the power supply output is disabled Configure the DMM to measure 10 amperes DC across the front panel OUTPUT 1 2 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 2 485 and 2 515 A Press CURRENT A or CURRENT V to adjust the power supply output current until the DMM reads 2 500 A Verify that the power supply CURRENT A readout indicates between 2 485 and 2 515 A Press CURRENT SET Set the power supply output current to 0 1 A Verify that the DMM reads between 0 089 a
98. hat the power supply readout displays cL11 indicating voltage full scale calibration 10 Adjust VR501 and VR601 to the settings listed in Table 11 See Figure 13 for the adjustment locations Following the adjustment enter the DMM reading on the power supply keypad and press 2 Table 11 Voltage full scale adjustment full calibration Instrument model To cal OUTPUT 1 To cal OUTPUT 2 P52520 P 2520G Adjust VR601 for a DMM Adjust VR501 fora DMM reading of 37 00 V reading of 37 00 V PS2521 P 2521G Adjust VR601 fora DMM Adjust VR601 fora DMM reading of 21 00 V reading of 21 00 V 11 Verify that the power supply readout displays cL20 indicating current offset calibration 12 Configure the DMM to measure 2 amperes DC NOTE For proper current calibration use quality test leads with good low temperature thermal characteristics Also ensure that good connections exist between the DMM and the Power Supply Bench Test Instruments and Handheld Oscilloscopes Basic Service 59 PS2520 and PS2521 Series Adjustment Procedures 60 O O Instrument front Figure 13 VR501 VR601 adjustment location 13 14 15 16 17 18 Enter the DMM reading on the keypad in amperes then press Verify that the power supply readout displays cL2F indicating that the current
99. he rear of the instrument and lift To reinstall the cover perform steps 1 through 3 above in reverse order Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Adjustment Procedures Figure 5 PS280 PS283 instrument cover removal Bench Test Instruments and Handheld Oscilloscopes Basic Service 17 PS280 and PS283 Adjustment Procedures Circuit Board Locations Refer to Figure 6 to locate PS280 PS283 internal circuit boards FrontPanel controls circuit board Display Assembly circuit board aster S lave circuit board 9 BN 5 V circuit board Figure 6 PS280 PS283 internal circuit board locations 18 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Adjustment Procedures Independent Mode Adjustments Refer to Figures 6 7 and 8 for the circuit board and adjustment locations used in this procedure MASTER Voltage Output To adjust the MASTER voltage output perform the following steps 1 10 11 Disengage both TRACKING mode switches both switches out so that the power supply is in the INDEPendent operating mode Set the MASTER AMPS VOLTS meter selection switch to VOLTS Set the digital multimeter to measure a DC voltage of 16 mV Set the PS280 PS283 MASTER VOLTAGE control to minimum fully counterclockwise Connect the digital multimeter to the and terminals of the M
100. he values listed in step 19 for memory location 01 Reset the power supply as follows VOLTS SET 6V CURRENT SET 5A DELAY 3s Press SHIFT STORE 2 to store the above values in the memory 02 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values set in step 21 for memory location 02 Repeat steps 6 through 12 above Press STEP SET Set the VOLTS SET to 1 V Press VOLTS V7 and verify that as you attempt to decrease the voltage below 0 00 V Err 018 appears on the CURRENT A and VOLTS readouts The voltage should decrease in 1 volt steps on the VOLTS readout Press VOLTS A and verify that as you attempt to increase the voltage past 6 00 V Err 016 appears on readouts The voltage should increase in 1 volt steps on the VOLTS readout Press STEP SET Set the CURRENT SET to 1 A Press CURRENT and verify that as you attempt to decrease the current below 0 000 A Err 019 appears on the readouts and the C C indicator lights The current should decrease in 1 ampere steps on the CURRENT A readout Press CURRENT ZA and verify that as you attempt to increase the current past 5 100 A Err 017 appears on the readouts The current should increase in ampere steps on the CURRENT A readout OCP Series and Parallel Mode Indicators Use the following steps to verify OCP series and parallel output indicator function 1 On the power supply front panel press
101. iate load resistor values Verify that the power supply maintains an output of 5 V 0 25 V Bench Test Instruments and Handheld Oscilloscopes Basic Service hi yy Lae See PS280 and PS283 Adjustment Procedures This section contains procedures to adjust PS280 and PS283 power supplies If your instrument fails a performance requirement use these procedures to return it to factory specifications In this section you will find the following information m A list of adjustments m A list of test equipment needed to make the adjustments m Instructions on how to prepare instruments for adjustment m Step by step adjustment procedures The procedures in this section do not verify performance To confirm that your power supply meets factory specifications implement the procedures in the Performance Verification section List of Adjustments Use the adjustments listed in Table 10 to return PS280 and PS283 power supplies to factory calibration Table 10 PS280 and PS283 adjustments Independent Mode Adjustments MASTER Voltage Output SLAVE Voltage Output MASTER Current Output SERIES Tracking Mode Adjustments Series Tracking PARALLEL Tracking Mode Adjustments Parallel Tracking 5 V Fixed Output Adjustments 5 V Output Current Limit Overload Indicator Bench Test Instruments and Handheld Oscilloscopes Basic Service 15 PS280 and PS283 Adjustment Procedures Test Equipment To ensure accurate adjustments use the re
102. ication Set Up Following a 20 minute warm up period preset the oscilloscope to the settings listed below Table 12 Oscilloscope initial settings Control Setting INTENSITY Visible Display CURSOR ON OFF Off VERTICAL 0000000000000 POSITION Midane MODE TA VOLTS DIV 10 mV VARIABLE CAL GND n HORIZONTAL 0000000000000 SEC DIV 10 ms POSITION Midane MAG Off Out XY Off Out SWEEP VARIABLE CAL TRIGGER 0000000000 SLOPE Positive push switch out LEVEL Midane MODE AUTO SOURCE CH1 COUPLING DC Bench Test Instruments and Handheld Oscilloscopes Basic Service 9 TAS 200 Series Performance Verification Vertical Check The following checks verify the vertical accuracy of your oscilloscope DC Gain Accuracy To check DC gain accuracy perform the following steps 1 Use the 50 Q precision coaxial cable to connect the standard amplitude output of the DC calibration generator 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 CHI CH2 CH 1 CH 2 AC DC DC CH 1 CH 2 VOLTS DIV mV TRIGGER MODE AUTO HORIZONTAL SEC DIV 0 5 ms CH 1 CH 2 GND Out release 3 Setthe oscilloscope CH 1 VOLTS DIV Scale and calibration generator output to each of
103. ile they are connected to a voltage source Ground the Product Some of these products are grounded through the grounding conductor or the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product you are using ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product you are using Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Replace Batteries Properly Replace batteries only with the proper type and rating specified Recharge Batteries Properly Recharge batteries for the recommended charge cycle only Use Proper AC Adapter Use only the AC adapter specified for the product you are using Benchtop Instruments Basic Service iii General Safety Summary Symbols and Terms A A Do Not Operate Without Covers Do not operate these products with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for the product you are using Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate in Wet Damp Conditions To avoid electric shock do not operate these pr
104. ing edge Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Performance Verification 8 Set the THM420 trigger slope to and verify that the waveform display starts on the falling edge 9 Disable the voltage source output 10 Disconnect the test setup Printer The following check verifies printer operation 1 Press and hold the THM420 PRINT button for two seconds Verify that the Bl icon appears in the upper right corner of the display Back Light The following check verifies that the display back light operates properly 1 Press the THM420 LIGHT button and verify that the back light is on Bench Test Instruments and Handheld Oscilloscopes Basic Service 15 THM420 Performance Verification 16 Bench Test Instruments and Handheld Oscilloscopes Basic Service S OS THM420 Adjustment Procedures This section contains procedures to adjust the THM420 If your instrument fails a performance requirement use these procedures to return it to factory specifica tions In this section you will find the following information W Instructions on how to prepare the instrument for adjustment W Step by step adjustment procedures The procedures in this section do not verify performance To confirm that your instrument meets factory specifications perform the procedures in the THM420 Performance Verification section Preparation for Adjustment Remove the Bottom Cover The following guidelines apply to all i
105. ion contains procedures to adjust TAS 220 and TAS 250 oscilloscopes If your instrument fails a performance requirement use these procedures to return it to factory specifications In this section you will find the following information m A list of adjustments m A list of test equipment needed to make the adjustments m Instructions on how to prepare instruments for adjustment W Step 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 adjustments Power Supply Adjustments 12 V Supply Intensity Focus and Astigmatism VerticalAdustments DC Balance Variable DC Balance Channel 2 Inverted Balance and Position Center ADDModeBalae Vertical Gain MAG Sensitivity High Frequency Compensation Attenuator Compensation Channel 1 Output DC Offset Bench Test Instruments and Handheld Oscilloscopes Basic Service 21 TAS 200 Series Adjustment Procedures Table 18 TAS 220 and TAS 250 adjustments cont Horizontal Adjustments X10 Magnification Registration Horizontal Position 1 ms Timing 1 us and 1 us Timing X Gain Accuracy X Axis Offset Trigge
106. ivisions in amplitude Adjust VC101 VC201 to flatten the waveform See Figure 10 for the adjustment locations Set the CH 1 CH 2 VOLTS DIV control to 1 V Readjust the generator output to produce a waveform five divisions in amplitude Adjust VC103 VC203 to flatten the waveform See Figure 10 for the adjustment locations 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 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 Set up the oscilloscope as follows VERTICAL MODE BOTH CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 GND In TRIGGER SOURCE CH 1 Position the CH 1 and CH 2 traces to the center horizontal graticule line with the VERTICAL POSITION controls Connect the rear panel CH 1 OUTPUT to the front panel CH 2 input with a 50 Q coaxial cable Set the CH 2 GND push switch to the out position On the Main board adjust VR112 to position the CH 2 trace to the center horizontal graticule line See Figure 8 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures Horizontal Adjustments X10 MAG Registration Horizontal Position 1 ms Timing To locate the adjustments for
107. l the power supply CURRENT A readout indicates 1 500 A 8 Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM readout changes 0 003 V over the adjustment range 9 Press OUTPUT ON OFF Verify that the OUT indicator turns off then disable the electronic load 10 Press SHIFT gt OUT 2 verify that the 2 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service 23 PS2520 and PS2521 Series Performance Verification 24 11 Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 3 12 Repeat steps 5 through 9 above Series Operation Use the following steps to check the series mode output accuracy 1 Press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 and OUTPUT 1 terminals Maintain the equipment configuration and polarities shown in Figure 3 3 Repeat steps 5 through 9 of the Outputs 1 and 2 procedure above Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Keep the powe
108. listed in Table 14 then verify that the THM420 readout remains within the readout limits Bench Test Instruments and Handheld Oscilloscopes Basic Service 13 THM420 Performance Verification 14 Trace Shift Trace Slope Table 14 AC Amperes accuracy arent fepe Wain 200 0 mA 50 Hz 195 9 mA THM420 rotary switch Maximum 204 1 mA 5 Set the METER SCOPE button to SCOPE mode 6 Verify that the current measurement is displayed 7 Disconnect the test setup NOTE For the following series of tests the METER SCOPE button must remain in the SCOPE mode The following check verifies trace shift accuracy 1 Turn the THM420 rotary switch to V z 2 Connect the THM420 COM input to the V Q Hz input with a shorting strap 3 Verify that there is no trace shift while using the 4 w buttons to switch between SCALE settings vertical volts division 4 Disconnect the test setup The following check verifies trace slope accuracy 1 Turn the THM420 rotary switch to V z Set the DC AC button to AC V Set the SCALE to 200 V with the 4 w buttons Set the horizontal time per division to 100 us with the 4 gt buttons wa e amp nS Connect the voltage source to the THM420 COM and the V Q Hz input connectors e Set up the voltage source to output an AC voltage of 200 V at 1 kHz 7 Set the THM420 trigger slope to J and verify that the waveform display starts on the ris
109. listed in Table 8 Table 8 Performance verification checks DC Voltage AC Voltage Resistance Diode and Continuity Frequency DC Amperes AC Amperes Trace Shift Trace Slope Printer Back Light The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently Bench Test Instruments and Handheld Oscilloscopes Basic Service 9 THM420 Performance Verification Test Equipment Verification Procedure 10 ZN DC Voltage The performance verification procedures use external traceable test equipment to directly check warranted characteristics The following procedures use either the Wavetek 9100 Universal Calibration System with Oscilloscope Calibration Module Option 250 or the Fluke 5500A Multi product Calibrator with Oscilloscope Calibration Option 5500A SC Alternative test equipment must meet or exceed the intended minimum requirements If you substitute equipment you may need to modify the performance verification procedures NOTE Before beginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations WARNING The following tests use hazardous voltages If you use standard banana plugs to apply test signals to the THM420 instrument do not touch the exposed conductors NOTE For the following series of tests set the METER SCOPE button to the METER mode To
110. ly readouts display the error message Err 012 Press OUTPUT ON OFF Verify that the OUT indicator turns off Press OCP ON OFF to return the power supply to normal operation Verify that the OCP indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 5 Repeat steps 4 through 18 above Bench Test Instruments and Handheld Oscilloscopes Basic Service 51 PS2520 and PS2521 Series Performance Verification 52 Constant Current Source Accuracy Parallel Operation Use the following steps to check the parallel mode output accuracy 1 With the power supply set to OUT 2 press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Set the DMM to measure 10 amperes DC Set up the power supply as follows VOLTS SET 20V CURRENT SET 5 0A OVP SET 22 V Repeat steps 5 through 14 of the Outputs 1 and 2 procedure above but verify that the difference between I1 and I2 is lt 0 006 A Repeat steps 15 through 18 of the Outputs 1 and 2 procedure above Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Us
111. ment Maintain the equipment configura tion and polarities shown in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 4 through 10 above Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 terminals and connect them to the rear panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Disconnect the DMM and electronic load from the instrument Series Operation Use the following steps to check the series mode output accuracy 1 With the power supply set to OUT 2 press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 and OUTPUT 1 terminals Maintain the equipment configur
112. n Parallel Operation Use the following steps to check the parallel mode output accuracy 1 Keep the power supply set to OUT 2 Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Set the DMM to measure 5 amperes DC Set up the power supply as follows VOLTS SET 36V CURRENT SET 3 0A OVP SET 38 5 V Repeat steps 5 through 14 of the Outputs 1 and 2 procedure above but verify that the difference between I1 and I2 is lt 0 006 A Repeat steps 15 through 18 of the Outputs 1 and 2 procedure above Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 5 Set up the power supply as follows VOLTS SET 6V CURRENT SET 3 0A OVP SET 7N Repeat steps 5 through 18 of the Outputs 1 and 2 procedure above Disconnect the DMM and electronic load from the instrument Constant Current Complete the following procedures to verify constant current source accuracy Source Accuracy Outputs 1 and 2 Use the following
113. n question The performance verification procedures provide a valid confirmation of instrument electrical characteristics and function under the following conditions m The instrument operates in a 20 to 30 C 68 to 104 F ambient environment m The instrument warms up for at least 20 minutes before the verification begins m The cabinet remains installed on the instrument The PS280 and PS283 performance verification consists of the checks listed in Table 5 Table 5 Performance verification checks Constant Current Load Regulation Check MASTER Current Regulation INDEP mode SLAVE Current Regulation INDEP mode MASTER Current Regulation PARALLEL mode Constant Current Ripple and Noise Check MASTER Current Ripple SLAVE Current Ripple Constant Voltage Regulation Check MASTER Voltage Regulation SLAVE Voltage Regulation 5 V Fixed Voltage Regulation The performance verification procedure should be performed annually or after every 2000 hours of operation if used infrequently Bench Test Instruments and Handheld Oscilloscopes Basic Service 7 PS280 and PS283 Performance Verification Test Equipment The performance verification procedures use external traceable test equipment to directly check warranted characteristics Alternative test equipment must meet or exceed the intended minimum requirements If you substitute equipment you may need to modify the performance verification procedures NOTE Before be
114. n the alignment square as shown in Figure 12 See Figure 13 for the adjustment locations X Gain VRAOI X Position VRAO2 Y Gain VRAO3 Y Position VRAOA 3 Simultaneously press the PROBE X1 X10 and the AV AT 1 AT push switches again to exit the adjustment mode Bench Test Instruments and Handheld Oscilloscopes Basic Service 43 TAS 200 Series Adjustment Procedures Y gain Y pos VRAO3 amp 7 VRA04 lt vrao VRAOS X gain gt lt X pos VRA02 Drift Instrument front V Figure 13 Control and I O board viewed from the instrument top Drift Use the following procedure to minimize the readout drift 1 Ifthe 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 VRAOS on the Control and I O board to minimize the character drift 3 Simultaneously press the PROBE X1 X10 and the AV AT 1 AT push switches to turn off the display readouts if desired 44 Bench Test Instruments and Handheld Oscilloscopes Basic Service Instructions Manual Tektronix THM420 Digital Multimeter 070 9856 01 Sy Se Table of Contents THM420 Digital Multimeter eee 1 THM420 Specifications 0 cece cece eee ee ce renee eee 3 THM420 Performance Verification eee 9 Test EQUIPMENT i 122 ose cR reci b S
115. nd 0 111 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 12 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 13 Repeat steps 2 through 11 above to measure the OUTPUT 2 current setting and readout accuracy Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 9 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Set up the power supply as follows VOLTS SET 6V CURRENT SET 5A OVP SET 7N Press STEP SET Set the CURRENT SET to 0 002 A Ensure that the power supply output is disabled Configure the DMM to measure 10 amperes DC across the front panel OUTPUT 3 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 4 980 and 5 020 A Press CURRENT A or CURRENT V to adjust the power supply output current until the DMM reads 5 000 A Verify that the power supply CURRENT A readout indicates between 4 980 and 5 020 A Press CURRENT SET Set the power supply output current to 0 1 A 10 Verify that the DMM reads between 0 089 and 0 111 A 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off Parallel Operation Use the following steps to the check parallel mode accuracy 1 2 Press SHIFT OUT 2
116. nnect the power supply AC input to the Variac variable output Allow 20 minutes for the power supply to warm up and stabilize Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 3 for details T Power suppl Electronic load Digital multimeter E Figure 8 Constant voltage source test setup 9 Set the DMM to measure 25 VDC Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 20V CURRENT SET 2 55A OVP SET 22 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 2 500 A Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM readout changes lt 0 003 volts over the adjustment range Press OUTPUT ON OFF and disable the electronic load 10 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 11 Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the front panel OUTPUT 2 terminals Maintain the equipment con
117. ns of the CH 1 VARIABLE control Repeat steps 1 and 2 above for CH 2 CH 2 Inverted Balance 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 Position the oscilloscope trace on the center horizontal graticule line using the CH 2 POSITION control Verify that there is minimal trace shift lt 1 divisions on the TAS 200 series instrument when switching the CH 2 INVERT button in and out Set the oscilloscope CH 2 INVERT button to the out position Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verification Horizontal Check The following checks verify the horizontal accuracy of your oscilloscope Time Base Accuracy To check time base accuracy perform the following steps 1 Use the 50 Q precision coaxial cable to connect the output of the time mark generator to the 50 Q termination then connect the 50 Q termination to the TAS 200 series instrument CH 1 input See Figure 4 below Time Mark Generator Precision cable 50 Q Termination Figure 4 Timing check setup 2 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 AC DC DC CH 1 VOLTS DIV 0 5 V CH 1 GND Out release HORIZONTAL SEC DIV l us TRIGGER MODE AUTO TRIGGER COUPLING DC 3 Setup the time mark generator to produce 0 1 us markers 4 Center the time marks verticall
118. nstrument adjustments W Perform all adjustments in a 20 to 30 C 68 to 86 F ambient environ ment m Before making any adjustment warm up the instrument for at least 20 minutes M Do not alter any setting without reading the entire adjustment procedure first M Do not alter a setting unless a performance characteristic cannot be met at the current setting m Read the Safety Summary at the beginning of this manual You must remove the bottom cover to gain access to the internal adjustments To remove the cover refer to Figure 2 while performing the following steps 1 Remove the battery pack Lay the instrument face down on a flat work surface 2 3 Remove the four cover screws with a Phillips head screwdriver 4 Carefully lift the bottom cover off of the instrument 5 Replace the battery pack the instrument must be powered for the adjustment procedures that follow Bench Test Instruments and Handheld Oscilloscopes Basic Service 17 THM420 Adjustment Procedures To reinstall the bottom cover following the adjustments perform steps 1 and 4 above in reverse order Figure 2 Removing the bottom cover Access the Main Circuit You must access the main circuit board to make adjustments To expose the Board board refer to Figure 3 while performing the following steps 1 Remove the two circuit board mounting screws with a Phillips head screwdriver 2 Lift the top circuit board up and position it to
119. nts and Handheld Oscilloscopes Basic Service SS MX THM420 Specifications The characteristics listed in this section apply under the following conditions The instrument operates in an 18 to 28 C ambient environment unless otherwise noted NOTE All specifications are warranted unless marked typical Typical characteristics are not guaranteed but are provided for the convenience of the user Table 1 General specifications Characteristic Description Display 334 digit 4000 count LCD Polarity Display Automatic Overrange Display OVER is displayed Low Voltage Indicator Battery indicator is displayed Measurement Rate 50 ms Automatic power off time Approximately 30 minutes Power Six AA ANSI NEDA 15A or IEC LR6 batteries Battery Life Back light Off typically greater than 10 hours using six alkaline batteries Maximum Floating Voltage 600 VACams CAT II or 850 VDC between any terminal to earth and ground Maximum Input Voltage 600 VACams CAT II or 850 VDC between V and COM Maximum Input Current Between mA and COM 400 mA Between A and COM 10 A for 2 minutes 8A Maximum Open Circuit Input Voltage Between A and COM 600 V Between mA and COM 350 V Bench Test Instruments and Handheld Oscilloscopes Basic Service 3 THM420 Specifications Table 2 Measurement characteristics Characteristic Description Volts DC Ranges 400 mV 4 V 40 V 400 V 850 V AC Ranges 400 mV
120. o 20 MHz 10 to 50 MHz 2 0 divisions internal 0 2 V external Video Video Input Impedance Typical 1 MQ 30 pF Maximum Input Signal 100 V DC peak AC Table 5 Typical Z Axis characteristics TAS 200 series Characteristic Maximum Input Voltage Description 50 V DC peak AC Sensitivity 3 Vp p Trace becomes brighter with negative input Frequency Bandwidth DC to 5 MHz Input Resistance 5kQ Table 6 Typical X Y mode operation Characteristic TAS 250 description Sensitivity Same as CH 1 vertical axis Sensitivity Accuracy 5 mV to 5V div 4 1 to 2 mV div 6 Frequency Bandwidth DC to 1 MHz DC to 2 MHz X Y Phase Difference lt 3 from DC to 50 kHz lt 3 from DC to 100 kHz EXT HOR Sensitivity 0 1 V div Table 7 Typical probe compensation signal characteristics TAS 200 series Characteristic Description Waveform Positive going square wave Frequency 1 kHz Duty Ratio 50 50 Output Level 2 Vp p Output Resistance 2kQ Bench Test Instruments and Handheld Oscilloscopes Basic Service 5 TAS 200 Series Specifications Table 8 Environmental characteristics Characteristic Description Temperature Operating 0 to 40 C Nonoperating 40 to 70 C 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 0 C operating test are performed ahead of step 2 40 C nonoperating test Equipment shall remain off upon return to room ambient during s
121. o select CH 1 OFFSET This automatically adjusts the channel offset 4 Use a patch cord to short the THM500 series instrument COM and CH 1 inputs as shown in Figure 11 Patch cord CH1 Figure 11 DC offset test setup 5 Press the THM500 series instrument POSITION SCALE button until the readout shows SCALE in the lower right corner then use the A and Y buttons to set the CH 1 vertical scale to 5 mV div 6 Verify that the offset is less than four pixels from the center graticule line 7 Usethe A and v buttons to set the vertical scale to the next range 8 Repeat steps 6 through 7 above until you have checked all ranges 10 mV div through 500 V div 9 If your THM500 series instrument is equipped with two channels repeat steps 3 through 8 above for CH 2 10 Disconnect the test setup 11 Use the menus to return the THM500 series instrument to the factory default settings select RESET ALL NOTE Return THM575 products to the initial language selection if you changed the language selection You will find these selections in the Utility menu Bench Test Instruments and Handheld Oscilloscopes Basic Service 23 THM500 Series Performance Verification 24 Bench Test Instruments and Handheld Oscilloscopes Basic Service
122. oad to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 2 Set the DMM to measure 10 VDC Set up the power supply as follows VOLTS SET 6V CURRENT SET 5 1A OVP SET 7N Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 5 000 A Record the DMM voltage V1 Turn off the electronic load and record the DMM voltage again V2 Verify that the difference between V1 and V2 is lt 6 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 3 terminals and connect them to rear panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Disconnect the DMM and electronic load from the instrument Bench Test Instruments and Handheld Oscilloscopes Basic Service 45 PS2520 and PS2521 Series Performance Verification 46 Constant Voltage Source Accuracy Complete the following procedures to verify constant voltage source accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Set up the Variac Co
123. ocedures NOTE Do not readjust the CURRENT control setting through the remainder of this procedure 6 Engage both TRACKING switches both switches in so that the power supply is in the PARALLEL operating mode 7 Set the SLAVE CURRENT control to maximum fully clockwise and set the SLAVE VOLTAGE control to midrange 8 Adjust VR502 Master Slave circuit board until a reading of 2 A PS283 or 4 A PS280 is displayed on the multimeter 9 Disconnect the test setup 5 V Fixed Output Adjustments 5 V Output Refer to Figures 6 and 10 for the circuit board and adjustment locations used in this procedure To adjust the 5 V fixed output perform the following steps 1 Set the digital multimeter to measure a DC voltage of 5 25 V 2 Connect the digital multimeter to the terminals of the 5 V FIXED 3A output 3 Adjust VR401 5 V circuit board until the multimeter displays 5 00 V 0 25 V 4 Disconnect the multimeter from the power supply E VR401 VR403 VR402 Q Figure 10 5 V circuit board adjustments Bench Test Instruments and Handheld Oscilloscopes Basic Service 23 PS280 and PS283 Adjustment Procedures Current Limit To adjust the current limit perform the following steps 1 2 Set the digital multimeter to measure a DC current of 3 25 A Adjust VR403 5 V circuit board fully counterclockwise Connect a variable load and the multimeter in series to the terminals of the 5 V FIXED 3A
124. oducts in wet or damp conditions Do Not Operate in Explosive Conditions To avoid injury or fire hazard do not operate these products in an explosive atmosphere Keep Product Surfaces Clean and Dry To avoid electric shock and erroneous readings keep probe surfaces clean and dry Provide Proper Ventilation Refer to the product installation instructions for details on installing the product so it has proper ventilation Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms on the Products These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Benchtop Instruments Basic Service General Safety Summary Symbols on the Product The following symbols may appear on the product A AN m DANGER Protective Ground ATTENTION Double High Voltage Earth Terminal Refer to Manual Insulated Benchtop Instruments Basic Service V r Service Safety Summary Only qualified personnel should perform service procedures Read this Service Safety Summary and the General
125. oltage of 35 V Set the SLAVE VOLTAGE control to maximum fully clockwise Adjust VR301 Master Slave circuit board for a reading of 31 5 V on the multimeter Adjust VR601 Display Assembly circuit board until the PS280 PS283 front panel display reads 31 5 V Disconnect the digital multimeter from the power supply 1044 Q VR601 VR201 L _ VR602 VR20 O Figure 8 Display Assembly circuit board adjustments To 1 adjust the MASTER current output perform the following steps Disengage both TRACKING mode switches both switches out so the power supply is in the INDEPendent operating mode Set the MASTER AMPS VOLTS meter selection switch to AMPS Set the digital multimeter to measure a DC current of 2 A Connect the digital multimeter to the and terminals of the MASTER output Set the MASTER CURRENT control to maximum fully clockwise Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Adjustment Procedures 10 11 12 13 Adjust VR103 Master Slave circuit board for a reading of 1 05 A PS283 or 2 1 A PS280 on the multimeter Adjust VR202 Display Assembly circuit board until the PS280 PS283 front panel display reads 1 05 A PS283 or 2 1 A PS280 Disengage both TRACKING mode switches both switches out so that the power supply is in the INDEPendent operating mode Set the SLAVE AMPS VOLTS meter selection switch to AMPS S
126. onnect the digital multimeter and load resistors to the and terminals of the power supply SLAVE output as shown in Figure 2 See Table 7 for the appropriate load resistor values 8 Verify that the power supply output current varies less than 0 2 3 mA while shunting load resistor RL1 with the shorting strap See Figure 2 above The following check verifies the PARALLEL mode MASTER current regulation performance 1 Set the power supply to the PARALLEL operating mode by engaging both TRACKING mode switches both switches in 2 Setup the digital multimeter to measure 25 VDC 3 Connect the digital multimeter to the and terminals of the power supply MASTER output 4 Adjust the power supply MASTER VOLTAGE control until the digital multimeter reads 25 VDC 5 Disconnect the digital multimeter from the power supply Bench Test Instruments and Handheld Oscilloscopes Basic Service PS280 and PS283 Performance Verification 6 Set the digital multimeter to measure a DC current of at least 1 A PS280 or 0 5 A PS283 Connect the digital multimeter and load resistors to the and terminals of the power supply MASTER output as shown in Figure 2 See Table 7 for the appropriate load resistor values Verify that the power supply output current varies less than 0 2 5 mA while shunting load resistor RL1 with the shorting strap See Figure 2 above Constant Current Ripple and Noise Check To check the constant cu
127. ons in amplitude on the display 3 Adjust VC102 VC202 to obtain an optimum waveform symmetry with minimal overshoot See Figure 10 for the adjustment locations 110 110 Instrument Ove 101 vVC201 TRIG BAL front Qvc102 Ove202 amp VR403 TRIG CENT 1 100 1 100 VR407 OFFSET VR401 VC104 ve204 X AXIS DC STEP BAT STEP BAT VR101 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 divisions in amplitude Adjust VC104 VC204 to obtain an optimum waveform symmetry with minimal overshoot See Figure 10 for the adjustment locations 6 Disconnect the square wave generator from the instrument 7 Connect a 10X probe to the CH1 CH 2 input 8 Setthe CH 1 CH 2 VOLTS DIV control to 10 mV division Bench Test Instruments and Handheld Oscilloscopes Basic Service 35 TAS 200 Series Adjustment Procedures 36 Channel 1 Output DC Offset 10 11 12 13 14 15 16 17 Connect the probe to the square wave generator and confirm that the output is a 1 kHz square wave Adjust the generator output to produce a waveform five divisions in amplitude on the display Adjust the probe compensation to flatten and optimize the waveform Set the CH 1 CH 2 VOLTS DIV control to 0 1 V Readjust the generator output to produce a waveform five d
128. ontrols of the THM420 and the frequency source to each of the values listed in Table 12 then verify that the THM420 readout remains within the readout limits 12 Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Performance Verification Table 12 Frequency accuracy 1 000 V 50 kHz 49 9 kHz THM420 range 100 kHz Maximum 50 09 kHz 4 Disconnect the test setup DC Amperes The following check verifies DC ampere measurement accuracy 1 Turn the THM420 rotary switch to mA x for the first verification turn the THM420 rotary switch to A for the second verification 2 Set the THM420 DC AC button to DCA 3 Setthe current source to output DC 4 Connect the current source output to the THM420 COM and the V O Hz input connectors 5 Setthe controls of the THM420 and the current source to each of the values listed in Table 13 then verify that the THM420 readout remains within the readout limits Table 13 DC amperes accuracy DC current source 200 0 mA 198 5 mA THM420 rotary Readout limits switch Maximum 201 5 mA 2 06 A 6 Do not disconnect the test setup AC Amperes The following check verifies AC ampere measurement accuracy 1 Turn the THM420 rotary switch to mA z 2 Set the THM420 DC AC button to ACA 3 Reconfigure the current source to output AC 4 Set the controls of the THM420 and the current source to each of the values
129. or greater accuracy Table 11 Bandwidth test settings THM500 series Leveled sine wave generator Leveled sine wave generator Instrument waveform vertical scale amplitude test frequency amplitude 100 mV div 6 divisions 5 MHz 4 2 divisions 600 mV p p readout 420 mV cursor readout 500 mV div 6 divisions 5 MHz 4 2 divisions 3 00 Vp p readout 2 1 V cursor readout 5 Vidiv 1 division 1MHz 0 7 divisions 5 00 Vp p readout 1 The waveform is aliased and appears untriggered Crosstalk from DMM to Oscilloscope 20 3 5 V cursor readout 5 If your THMS500 series instrument is equipped with two channels repeat Step 4 above on CH 2 all tests 6 Disconnect the test setup The following check assesses the crosstalk between the DMM and the oscillo scope 1 Connect the leveled sine wave generator output to the THM500 series instrument DMM and COM inputs Use a 50 Q termination as shown in Figure 9 Assure that the ground connection for each adapter connects to the common or ground connector of its associated instrument Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS00 Series Performance Verification 2 Connect the THM500 series instrument CH 1 input to the COM input using a patch cord as shown in Figure 9 50 Q cable 50 Q termination BNC to dual banana cable Leveled Sine Wave generator THM5xx
130. output Adjust the variable load until the multimeter displays 3 25 A Disconnect the multimeter from the power supply and reconnect the variable load without changing the setting to the terminals of the 5 V FIXED 3A output Set the digital multimeter to measure a DC voltage of 5 25 V Connect the digital multimeter to the terminals of the 5 V FIXED 3A output Slowly adjust VR403 5 V circuit board clockwise until the multimeter display shows a voltage drop of 5 to 6 mV Disconnect the test setup Overload Indicator To adjust the current limit overload indicator perform the following steps 1 2 24 Set the digital multimeter to measure a DC current of 3 25 A Connect a variable load and the multimeter in series to the terminals of the 5 V FIXED 3A output Adjust the variable load until the multimeter displays 3 10 A Adjust VR402 5 V circuit board until the OVERLOAD 5V3A indicator starts to light on the power supply Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service Instructions Manual Tektronix PS2520 and PS2521 Series Power Supplies 070 9854 02 Sy Sa Table of Contents PS2520 and PS2521 Series Power Supplies 1 PS2520 and PS2521 Series Specifications eee 3 PS2520 and PS2521 Series Performance Verification 7 Test Equiptiernit ika iiaia ade dera dte IRR ne be ib ES IR Vs 8 sub p ie srra en EEEE EE EN
131. played peak to peak signal is less than 0 5 divisions 5 mV 6 If your THM500 series instrument is equipped with two channels repeat steps 2 through 5 above for CH 2 7 Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service 15 THM500 Series Performance Verification Input Leakage Trace Shift 16 Time Base Accuracy The following check verifies an acceptable input leakage trace shift 1 Use the THM500 series instrument menus to set the sampling mode to SAMPLE NORMAL for the THM571 then turn the menus off 2 Usea patch cord to short the COM and CH 1 inputs as shown in Figure 5 Patch cord COM CH1 SITE Figure 5 Trace shift test setup 3 Press the THM500 series instrument POSITION SCALE button until the readout in the lower right corner shows SCALE then use the A and Y buttons to set the vertical scale to 5 mV div 4 Press the THM500 series instrument POSITION SCALE button until the readout in the lower right corner shows POS then use the A and Y buttons to position the trace vertically at the center of the display 5 Verify that as you remove the shorting patch cord the waveform does not move more than three pixels vertically 6 If your THM500 series instrument is equipped with two channels repeat steps 2 through 5 above for CH 2 7 Disconnect the test setup The following check verifies the time base accuracy 1 Connect the time mark generator marker o
132. position Connect a 50 kHz sine wave to the CH 1 input Adjust the generator output to produce a waveform four divisions in amplitude on the display Alternate the TRIGGER SLOPE push switch between the rising in and falling out slope settings Adjust VR403 for a 0 4 division downward vertical shift at the beginning of the sweep See Figure 10 for the adjustment location Trigger Center Use the following procedure to adjust the trigger center 1 Set up the oscilloscope as follows HORIZONTAL SEC DIV ms TRIGGER SOURCE CH 1 TRIGGER SET TO 50 In CH 1 AC DC AC Connect a 50 kHz sine wave to the CH 1 input Adjust the generator output to produce a waveform eight divisions in amplitude on the display Verify that the trigger point is within 1 5 divisions of the signal swing center Readjust the oscilloscope controls as follows TRIGGER SET TO 50 Out TRIGGER LEVEL Midway Adjust VR407 to position the trigger points equidistant from the center horizontal graticule line See Figure 10 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service 41 TAS 200 Series Adjustment Procedures Probe Compensation 42 To locate the adjustment for the following procedure refer to Figure 11 The Power and High Voltage board occupies the bottom left side of the instrument below the CRT fai ASTIG FREQ ADJ VR604 VR701 Instrument front SUB INTENSITY VR 603 SUB FOCUS 12V ADJ
133. power cord from its source before removing the instrument cover Following the adjustment procedure replace the instrument cover before using the power supply To remove the instrument cover refer to Figure 12 while performing the following steps 1 Remove the two handle mounting screws with a Phillips head screwdriver 2 Remove the six side panel mounting screws 3 Slide the cover toward the rear of the instrument and lift To reinstall the cover perform steps 1 through 3 above in reverse order mounting E Handle screws 2 plu va Side panel mounting screws 6 Figure 12 PS2520 series instrument cover removal Bench Test Instruments and Handheld Oscilloscopes Basic Service 97 PS2520 and PS2521 Series Adjustment Procedures Adjustment Procedure 58 Full Calibration To calibrate PS2520 series power supplies you must create voltage and current constants and store them in nonvolatile RAM Each set of constants consist of an offset and full scale value You can perform either partial or full calibrations To perform a full calibration the power supply follows a preset procedure that allows you to set the voltage current and overvoltage protection values You can also make individual calibrations as identified in Table 10 Each calibration procedure is identified by a display code Table 10 Calibration display codes Display code Calibration description cL00 Password accepted ini
134. pply front panel OUTPUT 2 terminals Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 35 950 and 36 050 VDC Press VOLTS A or VOLTS VY to adjust the power supply output voltage until the DMM reads 36 00 VDC Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 Verify that the power supply VOLTS readout indicates between 35 950 and 36 050 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 2 terminals Verify that the DMM reads between 0 0749 and 0 1250 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Current Set Accuracy Complete the following procedures to verify current setting and readout accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 9 10 11 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Set up the power supply as follows VOLTS SET 10 V CURRENT SET 1 5 A OVP SET 11V Press STEP SET Se
135. r Adjustments Trigger DC Offset Trigger Slope Balance Trigger Center Probe Compensation Cursors and Readout Adjustments Cursor Accuracy Drift 22 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures Test Equipment To ensure accurate adjustments use the following or equivalent test equipment Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 19 If you substitute equipment you may need to modify the procedures NOTE Before making any adjustment warm up the test equipment according to the manufacturer s recommendations Table 19 Adjustment test equipment Description Leveled Sine Wave Generator Time Mark Generator DC Calibration Generator Digital Multimeter Termination two required Cable Coaxial Cable Precision Coaxial Coupler Probe Minimum requirements 1 kHz to 250 MHz variable amplitude from 5 mV to 4 Vp p into 50 Q Variable marker frequency from 1 ms to 10 ns accuracy within 2 ppm DC voltage levels from 100 mV to 10 V 35V 4A 0 1 Accuracy 50 O female BNC input male BNC output 75 Q male to male BNC connectors 36 inch length 50 Q male to male BNC connectors 36 inch length Female BNC to dual male BNC dual input 10X probe Bench Test Instruments and Handheld Oscilloscopes Basic Service Example product Wavetek 9100 Universal Calibration System wit
136. r supply set to OUT 2 Press SHIFT gt PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 3 3 Setthe DMM to 40 VDC 4 Set up the power supply as follows VOLTS SET 36V CURRENT SET 3 1A OVP SET 38 5 V 5 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display 6 Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 3 000 A 7 Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM readout changes lt 0 003 volts over the adjustment range Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 8 Press OUTPUT ON OFF Verify that the OUT indicator turns off then disable the electronic load 9 Press SHIFT gt PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT gt OUT 3 verify that the 3 indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic
137. ress OUTPUT ON OFF Verify that the OUT indicator turns off Disconnect the DMM and electronic load from the instrument Parallel Operation Use the following steps to check the parallel mode output accuracy 1 10 11 Press SHIFT PARA INDEP to configure OUTPUT 1 and OUTPUT 2 for parallel operation Verify that the PARA indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 terminals Maintain the equipment configuration and polarities shown in Figure 2 Set the DMM to measure 40 VDC Set up the power supply as follows VOLTS SET 36V CURRENT SET 3 1 A OVP SET 38 5 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 3 000 A Record the DMM voltage V1 Turn off the electronic load and record the DMM voltage again V2 Verify that the difference between V1 and V2 is lt 6 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 terminals and connect them to the OUTPUT 2 terminals on the rear of the instrument Maintain the equipment configura tion and polarities shown in Figure 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service 21 PS2520 and PS2521 Series
138. rify constant voltage ripple and noise accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Ensure that the power supply output is disabled Connect the oscilloscope and 27 Q 75 W resistor to the front panel OUTPUT 1 terminals See Figure 4 for details Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification Power supply Oscilloscope Figure 9 Constant voltage ripple and noise test setup 3 Set up the oscilloscope to measure 100 mV AC coupled 4 Set up the power supply as follows VOLTS SET 36V CURRENT SET 2 55 A OVP SET 38 V 5 Press OUTPUT ON OFF Verify that the C V indicator lights up on the display 6 Using a 0 1 uF ceramic capacitor to decouple the test points adjust the oscilloscope and verify that the noise is lt 30 mVp p 7 Set up the oscilloscope to LINE trigger source Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the ripple changes lt 3 mV p p over the adjustment range 8 Press OUTPUT ON OFF Verify that the OUT indicator turns off 9 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 10 Ensure that the power supply output is disabled Remove the leads from the
139. rify that the 2 indicator lights up on the display Repeat steps 2 through 12 above to measure the OUTPUT 2 voltage setting and readout accuracy Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 9 10 11 12 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Set up the power supply as follows VOLTS SET 6V OVP SET 7N Press STEP SET Set the VOLTS SET to 0 05 V Ensure that the power supply output is disabled Configure the DMM to measure 10 VDC across the power supply front panel OUTPUT 3 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 5 972 and 6 028 VDC Press VOLTS A or VOLTS V7 to adjust the power supply output voltage until the DMM reads 6 00 VDC Verify that the power supply VOLTS readout indicates between 5 950 and 6 050 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 3 terminals Verify that the DMM reads between 0 0749 and 0 1250 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Series Operation Use the following steps to check the series mode accuracy 1 2 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display Set up the power supply as follows VOLTS SET 36V OVP SET 37V Press STEP SET Set the VOLTS SET to 0 05 V
140. rify that the DMM readout changes lt 0 003 volts over the adjustment range Bench Test Instruments and Handheld Oscilloscopes Basic Service 47 PS2520 and PS2521 Series Performance Verification 48 Constant Voltage Ripple and Noise Accuracy Press OUTPUT ON OFF Verify that the OUT indicator turns off then disable the electronic load Press SHIFT PARA INDEP to reconfigure the outputs for independent operation Verify that the PARA indicator turns off Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 7 8 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 3 terminals Maintain the equipment configuration and polarities shown in Figure 3 Set up the power supply as follows VOLTS SET 6V CURRENT SET 5 1A OVP SET 7N Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 5 000 A Adjust the output of the Variac from 108 to 132 VAC 120 V range or 198 to 242 VAC 220 V range Verify that the DMM readout changes lt 0 003 volts over the adjustment range Press OUTPUT ON OFF then disable the electronic load Disconnect the DMM and electronic load from the instrument Complete the following procedures to ve
141. rol to the ADD position On the Main board adjust VR301 to position the trace on the center horizontal graticule line See Figure 8 for the adjustment location Set the VERTICAL MODE switch to BOTH CH2 and then CH1 verify that the trace shifts less than 1 division from the center of the display If necessary repeat steps 2 through 4 to obtain the best performance Use the following procedure to adjust the vertical gain 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 CH 2 VOLTS DIV 10 mV CH 1 CH 2 VARIABLE CAL CH 1 CH 2 AC DC DC Connect a 50 mVp p 50 kHz square wave to the CH 1 and CH 2 inputs with a dual input coupler On the Main board adjust VR108 to obtain a waveform five divisions in amplitude See Figure 8 for the adjustment location Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures Set the CH 2 VERTICAL INVERT push switch to the in position Set the VERTICAL MODE control to the ADD position Position the trace to the center horizontal graticule aA R Adjust VR208 to obtain a flat line See Figure 8 for the adjustment location MAG Sensitivity Use the following procedure to adjust the MAG Sensitivity 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH2 CH 1 CH 2 VOLTS DIV 2mV CH 1 CH 2 VARIABLE CAL CH2 INVERT Out CH 1 CH 2 AC DC DC 2 Connect a 10 mVy 50 KHz square wave to the CH 1 CH 2 input
142. ronic load Digital multimeter Power supply Figure 10 Constant current load test setup 3 4 Set the DMM to measure 5 amperes DC Set up the power supply as follows VOLTS SET 20 V CURRENT SET 2 5 A OVP SET 22V Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 15 16 17 18 19 20 21 22 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the C C indicator lights up on the power supply display Record the DMM current reading 11 Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the wire connect ing the power supply OUTPUT terminal to the electronic load terminal Move the electronic load connection to the power supply OUTPUT terminal Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Record the DMM current reading again 12 Verify that the difference between I1 and I2 is lt 0 003 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Press OCP ON OFF verify that the OCP indicator lights up on the display Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the power supp
143. rrent lt 3 MAgms lt 5 MApms if rating current gt 3 5 A Temperature Coefficient 0 to 40 C 32 to 104 F Voltage lt 100 ppm 3 mV Current 150 ppm 3 mA Readback Resolution Voltage 10 mV 20 mV if rating voltage gt 36 V Current 1 mA 2 mA if rating current gt 3 5 A Readback Accuracy Voltage lt 0 05 25 mV 50 mV if rating voltage gt 36 V Current lt 0 2 10 mA Response Time 10 to 90 up lt 100 ms 90 to10 down 100 ms 21096 rating load Readback Temperature Coefficient Voltage 100 ppm 10 mV 20 mV if rating voltage gt 36 V Current 150 ppm 10 mA Drift Voltage lt 0 03 6 mV Current lt 0 1 6 mA Series Tracking Tracking Error Voltage lt 0 1 50 mV Load Effect Voltage lt 50 mV Source Effect Voltage lt 3 mV 1 Change in output over an 8 hour interval with a constant line voltage load and ambient temperature Requires a 30 minute warm up 4 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Specifications Table 1 Operational characteristics cont Characteristic Description Parallel Tracking Program Accuracy Voltage lt 0 05 25 mV 50 mV if rating voltage gt 36 V Current 0 296 20 mA Overvoltage Protection lt 2 0 6 V Load Effect Voltage 3 mV rear output 6 mV front output Current lt 6 mA x12 mA if rating current gt 3 5 A Source Effect Voltage lt 3 mV Current lt 6 mA GPIB Capability Optional IEEE
144. rrent ripple and noise performance of your power supply perform the following tests Power supply Test oscilloscope Figure 3 Constant current ripple and noise test setup MASTER Current Ripple The following check verifies the MASTER current ripple 1 Set the power supply to the INDEP operating mode by disengaging both TRACKING switches both switches out Set the power supply MASTER AMPS VOLTS meter selection switch to VOLTS Set the power supply to 25 VDC using the digital display Connect the test oscilloscope and load resistors to the and terminals of the MASTER output as shown in Figure 3 See Table 8 for the appropriate load resistor values Verify that the peak to peak ripple viewed on the oscilloscope is less than 3 mV Bench Test Instruments and Handheld Oscilloscopes Basic Service 11 PS280 and PS283 Performance Verification Set the power supply to the PARALLEL operating mode by engaging both TRACKING mode switches both switches in Verify that the peak to peak ripple viewed on the oscilloscope is less than 2 5 mV Set the power supply to the SERIES operating mode by disengaging the right TRACKING mode switch switch out Verify that the peak to peak ripple viewed on the oscilloscope is less than 5 mV Table 8 Load resistor values for ripple checks INDEP 150 70W 0 50 5W PARALLEL 70 140W 100 30W SLAVE Current Ripple The following
145. ry or the CRT enclosure X ray emissions generated within this product have been sufficiently shielded vi Benchtop Instruments Basic Service Se Le Preventing Electrostatic Discharge Follow the guidelines listed below to avoid product damage h CAUTION Static discharge can damage internal semiconductor components When performing service that requires internal access to an instrument adhere to the following precautions to avoid damaging internal modules or their compo nents Benchtop Instruments Basic Service Avoid handling modules or components in areas that have floors or work surfaces capable of generating a static charge Spray carpeted work areas with a solution of equal parts of water and fabric softener Wear clothing made from materials that do not accumulate static charges Avoid Wool and some artificial fibers which build up static charges readily wear cotton which conducts electricity and resists static accumulation Minimize the handling of static sensitive devices Transport and store static sensitive devices in their protected containers or on a metal rail Label any package that contains static sensitive parts Service instruments and modules at grounded static free work stations Do not allow devices capable of generating a static charge on a work station surface Wear a grounding strap while working with static sensitive devices Handle circuit boards by their edges if possible Do not slide
146. s backlight off Tested using RAYOVAC Alkaline MAXIMUM batteries Battery life extended when used intermittently Battery Saver User adjusted battery saver feature turns the instrument off after five minutes and the backlight off after one minute Memory Retention Time Memory hold up time following battery removal eight minutes minimum three e jo o hours typical Memory retention extended weeks or months if discharged batteries remain installed Bench Test Instruments and Handheld Oscilloscopes Basic Service 7 THM500 Series Specifications Table 4 General specifications cont 550 560 565 Environmental Temperature Operating 0 to 50 C 32 to 122 F Storage 20 to 70 C 4 to 158 F Humidity Operating 0 to 40 C 32 to 104 F Upto 90 relative humidity noncondensing 60 for 4 and 40 MQ measurements 41 to 50 C 106 to 122 F 60 relative humidity noncondensing Altitude Operating 2 200 m 7 221 ft Storage 12 192 m 40 000 ft Random Vibration 5 to 500 Hz 10 min axis operating 2 66 gnus 5 to 500 Hz 10 min axis nonoperating 3 48 ga us Sine Vibration Operating 0 06 inch displacement from 5 to 15 Hz 0 04 inch displacement from 15 to 25 Hz 0 02 inch displacement from 25 to 55 Hz TestDuration 10 minutes atthe peak resonance condition 33 Hz if no resonance found Test performed on each of three axes Half sine Shock Operating 30 g with pulse duration of 11 ms
147. s Basic Service 1 TAS 200 Series Oscilloscopes 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service S S S TAS 200 Series Specifications The characteristics listed in this section apply under the following conditions m The instrument operates in a 0 to 40 C ambient environment unless otherwise noted m The instrument warms up for at least 20 minutes m The instrument is adjusted at an ambient temperature between 20 and 30 C NOTE All specifications are warranted unless marked typical Typical characteristics are not guaranteed but are provided for the convenience of the user NOTE Input limits apply to signals with frequencies less than 1 kHz Table 1 Vertical deflection characteristics Characteristic TAS 220 description TAS 250 description Frequency Bandwidth 3 dB DC to 20 MHz DC to 50 MHz 5 mV div to 5 V div at 5 to 35 C 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 DC to 15 MHz 1mV div to 2 mV div Vertical Gain 15 to 35 C 5 mV div to 5 V div 3 1 mV div to 2 mV div 5 Variable Gain Typical To 1 2 5 or less of the readout indicated value Common Mode Rejection Ratio Typical 50 kHz gt 50 1 10 MHz gt 10 1 Input Impedance Typical 1 MQ 30 pF Vertical Linearity Typical 0 1 division or less of amplitude change when a waveform of two divisions at graticule center is moved vertically
148. scope as follows VERTICAL MODE CHI CH 1 VERTICAL POSITION Midrange Bench Test Instruments and Handheld Oscilloscopes Basic Service 37 TAS 200 Series Adjustment Procedures HORIZONTAL SEC DIV 1 ms SWEEP UNCAL Out 2 Connect the time mark generator to the CH 1 input with a 50 coaxial cable and 50 Q termination 3 Setup the generator to produce a 1 ms output 4 Adjust the generator output to produce a waveform two divisions in amplitude on the display 5 Adjust VR405 for a one marker per division display over the center eight divisions See Figure 8 for the adjustment location 1 usand 1 us Timing Use the following procedure to adjust the 1 us and 1 us timing 1 Set up the oscilloscope as follows VERTICAL MODE CHI CH 1 VERTICAL POSITION Midrange HORIZONTAL SEC DIV 1 us HORIZONTAL SWP UNCAL Out 2 Connect the time mark generator to the CH 1 input with a 50 2 coaxial cable and 50 Q termination 3 Setup the generator to produce a 1 us 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 for the adjustment location 6 Set the generator to produce a 1 us output 7 Setthe HORIZONTAL SEC DIV control to 1 us 8 Adjust VR802 for a one marker per division display See Figure 8 for the adjustment location X Gain Accuracy Use the following procedure to adjust the X gain accuracy 1 Set
149. ser Table 1 Operational characteristics Characteristic Description Independent Output Ratings PS2520 and PS2520G Two outputs 0 to 36 V atO to 1 5 A One output 0to6Vat3A P52521 and PS2521G Two outputs 0 to 20 V at0 to 2 5 A One output Oto 6V at0 to 5A Series Tracking Output R ating PS2520 and PS2520G Oto 72V at0 to 1 5 A PS2521 and PS2521G 0 to 40 V at 0 to 2 5 A Parallel Tracking Output R ating PS2520 and PS2520G 0to36Vat0to3A P52521 and PS2521G 0to 20 V at0 to 5 A Maximum Overvoltage Protection PS2520 and PS2520G 36 V outputs 38 5 V 6V output 7 0 V PS2521 and PS2521G 20 V outputs 22 5 V 6V output 7 0 V Load Effect Voltage Rear output lt 3 mV Front output lt 6 mV Current lt 3 mA lt 6 mA if rating current gt 3 5 A Source Effect Voltage lt 3 mV Current lt 3 mA Bench Test Instruments and Handheld Oscilloscopes Basic Service 3 PS2520 and PS2521 Series Specifications Table 1 Operational characteristics cont Characteristic Description Resolution Voltage 10 mV 20 mV if rating voltage gt 36 V Current 1 mA 2 mA if rating current gt 3 5 A Overvoltage Protection 10 mV 20 mV if rating voltage gt 36 V Program Accuracy Voltage lt 0 05 25 mV 50 mV if rating voltage gt 36 V Current lt 0 2 10 mA Overvoltage Protection lt 2 0 6V Ripple and Noise 20 Hz to 20 MHz Voltage Ripple 1 mVams 3 mV Voltage Noise Cu
150. st VR601 for a DMM reading of 21 00 V To cal OUTPUT 2 Adjust VR501 for a DMM reading of 37 00 V Adjust VR601 for a DMM reading of 21 00 V To cal OUTPUT 3 Adjust VR401 for a DMM reading of 6 5 V Adjust VR 601 for a DMM reading of 6 5 V cL20 Current Offset Calibration To calibrate the current offset enter the DMM reading in amperes on the power supply keypad and press lt The readout will return to normal when the calibration is complete cL21 Current Full Scale Calibration To calibrate the full scale current enter the DMM reading on the power supply keypad and press lt 4 The readout will return to normal when the calibration is complete cL30 Overvoltage Protection Offset Calibration Wait 10 seconds for the calibra tion to complete cL31 Overvoltage Protection Full Scale Calibration Wait 10 seconds for the calibration to complete cL40 Parallel Output Current Offset Calibration To calibrate the parallel output current offset perform the following steps 1 Verify that the PARA indicator lights up on the display 2 Enter the DMM current reading on the power supply keypad and press The readout will return to normal when the calibration is complete Bench Test Instruments and Handheld Oscilloscopes Basic Service 65 PS2520 and PS2521 Series Adjustment Procedures 66 cL41 Parallel Output Current Full Scale Calibration To calibrate the parallel output full scale curr
151. static sensitive components over any surface Do not use high velocity compressed air to clean or dry components or modules vii Preventing Electrostatic Discharge viii Benchtop Instruments Basic Service a A O O Preface This manual contains service information for a wide range of handheld and benchtop products Each section covers a product or related series of products and includes the following information W A product description that details instrument functions capabilities and recommended uses W A front panel illustration W A set of electrical mechanical environmental and physical specifications W A performance verification procedure to ensure the instrument meets specifications m An adjustment procedure to return the instrument to factory calibration not included for all instruments The information contained in this manual is current at the date of publication and is typical or suggested not guaranteed Since manual updates occur at approxi mately six month intervals information may be incomplete or missing in some versions Some instruments have optional service information available under separate cover This manual does not duplicate information from optional service manuals Refer to the optional accessories list in your user manual for Tektronix part numbers of optional service manuals A list of Handheld and Benchtop instruments manuals can also be found in Table ii on Page i NOTE This manual
152. t read from a current probe on CH 1 Trigger Source Modes Auto Level Default when in AutoRange mode Auto Default in manual operation Normal User selectable Single Shot User selectable Slope Positive or Negative slope e jo o Sensitivity Edge type DC Coupled 0 5 division 200 to 500 V div e o o 1 division 10 to 100 mV div 2 divisions 5mV div Bench Test Instruments and Handheld Oscilloscopes Basic Service THM500 Series Specifications Table 3 Scope specifications cont 550 560 565 Waveform display Display Update Rate Memories Setups Each setup memory stores the complete state of the instrument including the 4 41 18 multimeter state Waveforms Each waveform memory stores all waveform points and the scale of the selected 8 waveform Screens Each screen memory stores the exact information displayed on screen 8 snapshot Table 4 General specifications Real Time Display system Display Type Super Twisted Liquid Crystal Display Size Width 120 mm 4 72 inch Height 60 mm 2 36 inch Display Resolution 256 pixels horizontal x 128 pixels vertical fe je Contrast User adjustable fe je Backlight Electroluminescent ze Waveform Graticule 8 divisions vertical x 10 divisions horizontal Default crosshair grid or none 1 vertical division 15 pixels 1 horizontal division 25 pixels Power source Batteries Battery Life Typical 4 5 hours continuous operation with alkaline cell
153. t you may need to modify the procedures NOTE Before beginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations Table 6 Performance verification test equipment Description Minimum requirements Example product Digital Multimeter DMM 500 V 10 A accuracy within 0 01 Fluke 8505A Oscilloscope 20 MHz 396 vertical deflection accuracy Tektronix TDS 300 Series Electronic Load 40 V 8 A CR mode Variac 0t0250V 2A Resistors 2 2 050 W 27 Q 100 W Set Up Following a 20 minute warm up period preset your power supply to the settings listed in Table 7 Table 7 Power supply initial settings Control Setting SHIFT RECALL Enter 00 on keypad AUTO SEQ OFF SHIFT OUT 1 OCP OFF SHIFT SERIES INDEP INDEP SHIFT PARA INDEP INDEP OUTPUT OFF STEP SET volts 1 STEP SET current 0 1 8 Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification PS2520 and PS2520G Checks To verify the function and performance of the PS2520 and PS2520G power supplies implement the following checks in sequential order To verify the function and performance of the PS2521 and PS2521G power supplies see page NO TAG NOTE To clear a memory location enter 0 as the VOLTS SET and CURRENT SET values then save the 0 values to the desired memory location For a list of error code des
154. t locations Readjust VR103 VR203 to reduce peak aberrations to less than 0 24 divi sions while maintaining peak to peak aberrations less than 0 36 divisions See Figure 8 for the adjustment locations Connect a 50 KHz sine wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform six divisions in amplitude on the display 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 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 eight divisions in amplitude on the display Increase the frequency to 10 MHz for the TAS 220 or 15 MHz for the TAS 250 Verify that the waveform amplitude exceeds 5 6 divisions at these frequencies If steps 10 or 12 fail the specified criteria repeat steps 7 8 and 9 Set the VERTICAL MODE to CH2 and repeat steps 2 through 13 for CH 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Adjustment Procedures Attenuator Compensation Use the following procedure to adjust the vertical input attenuator compensation 1 Set up the oscilloscope as follows VERTICAL MODE BOTH CH 1 CH 2 VOLTS DIV 0 1 V CH 1 CH 2 VARIABLE CAL CH 1 CH 2 AC DC DC 2 Connect a 1 kHz square wave to the CH 1 CH 2 input Adjust the generator output to produce a waveform five divisi
155. t the CURRENT SET to 0 002 A Ensure that the power supply output is disabled Configure the DMM to measure 2 amperes DC across the front panel OUTPUT 1 2 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 1 487 and 1 513 A Press CURRENT A or CURRENT V to adjust the power supply output current until the DMM reads 1 500 A Verify that the power supply CURRENT A readout indicates between 1 487 and 1 513 A Press CURRENT SET Set the power supply output current to 0 1 A Verify that the DMM reads between 0 089 and 0 111 A Press OUTPUT ON OFF Verify that the OUT indicator turns off Bench Test Instruments and Handheld Oscilloscopes Basic Service 15 PS2520 and PS2521 Series Performance Verification 16 12 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 13 Repeat steps 2 through 11 above to measure the OUTPUT 2 current setting and readout accuracy Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 2 9 Press SHIFT OUT 3 verify that the 3 indicator lights up on the display Set up the power supply as follows VOLTS SET 6V CURRENT SET 3A OVP SET 7N Press STEP SET Set the CURRENT SET to 0 002 A Ensure that the power supply output is disabled Configure the DMM to measure 10 amperes DC across the front panel OUTPUT 3 terminals Press OUTPUT ON OFF Verify
156. t up the power supply as follows VOLTS SET 6V CURRENT SET 3 1A OVP SET 7N 4 Repeat steps 5 through 8 of the Outputs 1 and 2 procedure above 5 Remove the Variac from the test setup and repower the instrument Allow 20 minutes for the power supply to warm up and stabilize before the next check Constant Current Load Complete the following procedures to verify constant current load and overcur and Overcurrent rent protection accuracy Protection Accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 Press SHIFT gt OUT 1 verify that the 1 indicator lights up on the display 2 Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 5 for details igi i Electronic load Digital multimeter Power supply Figure 5 Constant current load test setup 3 Set the DMM to measure 2 amperes DC 4 Set up the power supply as follows VOLTS SET 36V CURRENT SET 1 5 A OVP SET 38 5 V Bench Test Instruments and Handheld Oscilloscopes Basic Service 27 PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 15 16 17 18 19 20 21 22 28 Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the C C indicator lights up on the power supply
157. ted instrument 3 Setthe voltage source for DC output 50 Q cable BNC to dual banana cable DMM Voltage source BNC to dual banana adapter Figure 2 DC and AC voltage accuracy test setups 4 For each row of Table 7 use the A and V buttons to set the THM500 series instrument to the range specified in the first column then set the voltage source to the output voltage specified in the second column Verify that the THM500 series instrument readout is within the range listed in the third column Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS00 Series Performance Verification AC Voltage Accuracy zs Table 7 DC voltage accuracy test limits Instrument range DC voltage source Instrument readout 400 mV 300 mV 298 0 to 302 0 4V 3V 2 980 to 3 020 40 V 30V 29 80 to 30 20 400 V 300 V 298 0 to 302 0 850 V 500 V 492 to 508 The following check verifies AC voltage accuracy WARNING This test uses hazardous voltages If you use standard banana plugs to apply test signals to the THM500 series instrument do not touch the exposed conductors 1 Set the THM500 series instrument to METER mode displaying V AC If the range display at the lower right corner does not indicate AUTO press the A and Y buttons simultaneously to set the RANGE to AUTO 2 Setthe voltage source to 60 Hz AC output 3 For each row of Table 8 use the A and V buttons to s
158. ted in the third column Table 9 Resistance accuracy test limits Instrument range Resistance source Instrument readout 400 Q 100 Q 99 3 to 100 7 4kQ 1kQ 0 993 to 1 007 40 KQ 10 kQ 9 93 to 10 07 400 kQ 100 KQ 99 3 to 100 7 4MO 1MO 0 993 to 1 007 3 Disconnect the test setup 4 If you will not be performing the Oscilloscope Verification procedures use the menus to return the THM500 series instrument to factory default settings by selecting RESET ALL 14 Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS500 Series Performance Verification Oscilloscope Verification Noise The following checks verify the performance of the oscilloscope functions The DMM checks begin on page 12 NOTE The THM575 can display the menus in more than one language The language selections are located in the Utility menu The following check verifies an acceptable noise level 1 Set the THM500 series instrument to SCOPE mode If necessary press the SELECT button to point to CH 1 2 Use a patch cord to short the THM500 series instrument COM and CH 1 inputs as shown in Figure 4 Patch cord COM CH1 L Figure 4 Noise test setup 3 Press the SCALE button until the readout in the lower right corner indicates SCALE then use the A and Y buttons to set the vertical scale to 10 mV div 4 Use the menus to set the sampling mode to SPIKE DETECT then turn off the menus 5 Verify that the dis
159. tep 6 Excessive condensation shall be removed before operating during step 7 Altitude Operating lt 4 570 meters 15 000 feet Maximum operating temperature decreases 1 C per 300 m 1 000 feet above 1 500 m 5 000 feet Nonoperating lt 15 250 meters 50 000 feet Relative Humidity Operating 30 to 40 C 90 relative humidity 0 5 Nonoperating 30 to 60 C 90 relative humidity 0 596 Five cycles 120 hours referenced to MIL T 28800D paragraph 4 5 1 2 2 for type Ill class 5 instruments Operating and nonoperating at 90 0 5 relative humidity Vibration Operating 15 minutes along each of three major axes ata 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 each of three major axes All major resonances must be above 55 Hz Shock Operating and Nonoperating 30 g half sine 11 ms duration three shocks per axis each direction for a total of 18 shocks Radiated and Conducted Emissions Meets EN55011 class A Safety Listed CSA C22 2 No 231 and UL1244 Table 9 Typical mechanical characteristics TAS 200 series Characteristic Description Dimensions 32 7 cm x 16 2 cm x 46 3 cm 12 9 inch x 6 38 inch x 18 2 inch Weight 7 0 kg 15 4 lbs Operating Voltages 100 V 120 V 220 V 240 V 1096 variation from selector range permitted Line Frequency 50 or 60 Hz Power Consumption 70 VA 6 Bench T
160. teps on the VOLTS readout Press VOLTS A and verify that as you attempt to increase the voltage past 21 00 V Err 016 appears on the readouts The voltage should increase in 1 volt steps on the VOLTS readout Press STEP SET Set the CURRENT SET to 1 A Press CURRENT and verify that as you attempt to decrease the current below 0 000 A Err 019 appears on the readouts and the C C indicator lights up on the display The current should decrease in 1 ampere steps on the CURRENT A readout Press CURRENT ZA and verify that as you attempt to increase the current past 2 500 A Err 017 appears on the readouts The current should increase in ampere steps on the CURRENT A readout To check the function of OUTPUT 2 press SHIFT OUT 2 Verify that the 2 indicator lights up on the display then repeat steps 2 through 18 above To check the function of OUTPUT 3 press SHIFT OUT 3 Verify that the 3 indicator lights up on the display then continue with the steps below 19 Set up the power supply as follows VOLTS SET 5V CURRENT SET 4A OVP SET 7N DELAY 3s Bench Test Instruments and Handheld Oscilloscopes Basic Service 33 PS2520 and PS2521 Series Performance Verification 34 20 21 22 23 24 25 26 27 28 29 Press SHIFT STORE 1 to store the above values in the memory 01 location Verify that the MEMORY CURRENT A and VOLTS readouts display t
161. that the THM500 series instrument rising edge of the fifth time mark is within one pixel of the center vertical graticule line measured at one division above the bottom of the displayed signal 9 Disconnect the test setup Bench Test Instruments and Handheld Oscilloscopes Basic Service 17 THM500 Series Performance Verification Vertical Accuracy The following check verifies vertical accuracy 1 Connect the voltage source output to the THM500 series instrument CH 1 and COM inputs as shown in Figure 7 Assure that the ground connection for each adapter connects to the common or ground connector of its associated instrument 50 Q cable BNC to dual banana cable gt Voltage source BNC to dual banana adapter Figure 7 Vertical accuracy test setup 2 Use the menus to set the THM500 series instrument CH 1 CPLG to DC then turn the menus off WARNING This test uses hazardous voltages If you use standard banana plugs to apply test signals to the THM500 series instrument do not touch the exposed conductors 3 For each row of Table 10 perform the following steps a Usethe THM500 series instrument A and V buttons to set the vertical scale to the setting listed in the first column b Setthe voltage source output to the value in the second column c Press the THM500 series instrument POSITION SCALE button to show POS then use the A and Y buttons to move the waveform three divisions
162. tiate calibration cL10 Voltage offset cL11 Voltage full scale cL20 Current offset cL21 Current full scale cL2F Current offset or current full scale calibration complete cL30 Overvoltage protection offset cL31 Overvoltage protection full scale cL40 Parallel output current offset cL41 Parallel output current full scale NOTE If the calibration procedure detects an error the readout will display an error code See your User manual for a list of error code descriptions To perform a full calibration perform the following procedures in sequential order Output 1 Use the following steps to calibrate OUTPUT 1 1 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display 2 Press SHIFT CURRENT V Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Adjustment Procedures 3 Enter the calibration password on the keypad PS2520 amp PS2520G enter 2520 PS2521 amp PS2521G enter 2521 4 Verify that the power supply readout displays cL00 indicating calibration mode 5 Configure the DMM to measure DC volts autorange 6 Connect the DMM positive and negative leads to the corresponding front panel OUTPUT 1 and terminals 7 Press on the power supply keypad Verify that the power supply readout displays cL10 indicating voltage offset calibration 8 Enter the DMM reading on the power supply keypad and press 9 Verify t
163. tical center with the CURSOR POSITION switch Toggle the TRACKING 9 O RE9 push switch to select only the O cursor Position the O cursor 4 divisions to the right of the display vertical center with the CURSOR POSITION switch Verify that the AT readout at the top left corner of the display reads between 7 72 and 8 28 ms Set the VERTICAL MODE switch to CH2 and repeat steps 4 through 8 for CH 2 To check cursor AV measurement accuracy implement the following steps Set up the oscilloscope as follows VERTICAL MODE CHI CH2 VERTICAL VOLTS DIV 1V Press and hold the oscilloscope AV AT 1 AT push switch until two horizontal cursors appear on the display Toggle the TRACKING 9 O amp P switch to select only the 0 cursor Position the 0 cursor 3 divisions above the display horizontal center with the CURSOR POSITION switch Toggle the TRACKING 9 O amp P push switch to select only the O cursor Bench Test Instruments and Handheld Oscilloscopes Basic Service 19 TAS 200 Series Performance Verification 6 Position the O cursor 3 divisions below the display horizontal center with the CURSOR POSITION switch 7 Verify that the AV 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 20 Bench Test Instruments and Handheld Oscilloscopes Basic Service SS LS TAS 200 Series Adjustment Procedures This sect
164. tions and procedures in this manual apply to both instruments The front panel switches provide three modes of operation for the PS280 and PS283 power supplies m Independent mode the output voltage and current of each supply is controlled independently W Series mode the variable outputs are connected in series and the controls of the MASTER power supply adjust the voltages or currents of both supplies Series mode allows the supplies to vary from 0 to 60 V at 0 to 2 A for the PS280 and 0 to 60 V at 0 to 1 A for the PS283 m Parallel mode the variable outputs are connected in parallel and the controls of the MASTER power supply adjust the voltages or currents of both supplies Parallel mode allows the supplies to vary from 0 to 4 A at 0 to 30 V for the PS280 and 0 to 2 A at 0 to 30 V for the PS283 Tektronix PS 280 DC Power Supply olo OJO CURRENT VOLTAGE CURRENT VOLTAGE E wx 4L SERES M PARALLEL Mb CC CM CC CV O O O O JU TRACKING JU MASTER J POWER SLAVE 0 30V 2A 0 30V 2A 5V FIXED 3A ON COO COO C Figure 1 PS280 DC Power Supply Bench Test Instruments and Handheld Oscilloscopes Basic Service 1 PS280 and PS283 Power Supplies 2 Bench Test Instruments and Handheld Oscilloscopes Basic Service SE Le PS280 and PS283 Specifications The characteristics listed in this section apply under the following conditions m
165. to complete the performance verification procedures The THM500 Series performance verification consists of the checks listed in Table 5 Table 5 Performance verification checks Functional Test DMM Verification DC Voltage Accuracy AC Voltage Accuracy Resistance Accuracy Oscilloscope Verification Noise Input Leakage Trace Shift Time Base Accuracy Vertical Accuracy Analog Bandwidth Crosstalk from DMM to Oscilloscope Crosstalk Between Oscilloscope Channels DC Offset Bench Test Instruments and Handheld Oscilloscopes Basic Service 9 THM500 Series Performance Verification Test Equipment Table 6 Test equipment Description Leveled Sine Wave Generator Time Mark Generator Calibrator DC Voltages AC Voltages Resistances Termination BNC Cable Safety Banana Lead Patch Cord BNC Female to Dual Banana Cable BNC Female to Dual Banana Adapter The performance verification procedures use external traceable test equipment to directly check warranted characteristics Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 6 If you substitute equipment you may need to modify the procedures NOTE Before beginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations Minimum requirements Example product Output must provide 5 V into 50 O with Wavetek 91
166. uals Product Tektronix part number 212 Oscilloscope 070 5053 00 214 Oscilloscope 070 5055 00 214 Storage Oscilloscope 070 1483 00 221 Oscilloscope 070 1573 01 222 Digital Storage Oscilloscope 070 7459 00 222A DSO B010100 thru B039999 070 8330 00 B040000 and above 070 8330 02 222PS Power Scout 070 8098 02 224 Digital Storage Oscilloscope 070 8405 02 305 DMM Oscilloscope 070 2423 01 314 Storage Oscilloscope 070 1824 00 335 Oscilloscope 070 1943 01 336 Digital Storage Oscilloscope 070 4421 00 2201 Portable Oscilloscope 070 7189 00 2205 Oscilloscope 070 6716 00 Bench Test Instruments and Handheld Oscilloscopes Basic Service i Service Reference Table ii Handheld and benchtop instruments service manuals cont Product Tektronix part number 2211 Oscilloscope 070 7234 00 2214 Digital Storage Oscilloscope 070 7783 00 2220 Digital Storage Oscilloscope 070 5302 00 2221A Oscilloscope B010100 to B019999 070 8157 01 B020000 and above 070 8549 00 2225 Oscilloscope 070 6299 00 2230 Digital Storage Oscilloscope 070 4999 00 2232 Digital Storage Oscilloscope B010100 to B029999 070 7067 01 B030000 and above 070 8548 00 2235 AN USM 488 Oscilloscope 070 4977 00 2245 Portable Oscilloscope 070 6276 00 2245A Portable Oscilloscope B010100 to B015999 070 6557 00 B016000 and above 070 7672 00 2246A Portable Oscilloscope 070 6555 00 2246 1Y 2R 2246 Mod A 070 7062 00 2247A
167. um trigger waveform amplitude TAS 220 TAS 250 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 Table 17 6 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 18 Bench Test Instruments and Handheld Oscilloscopes Basic Service TAS 200 Series Performance Verification Cursor Check AT Measurement Accuracy AV Measurement Accuracy The following checks verify the cursor accuracy of your oscilloscope To check cursor AT measurement accuracy implement the following steps Set up the oscilloscope as follows VERTICAL MODE CHI CH2 HORIZONTAL SEC DIV 1 ms Press and hold the oscilloscope CURSOR ON OFF push switch to activate the cursors If not already displayed press and hold the AV AT 1 AT push switch until two vertical cursors appear on the display Toggle the TRACKING 9 O amp E switch to select only the 0 cursor Position the 0 cursor 4 divisions to the left of the display ver
168. urns off Complete the following procedures to verify constant voltage load accuracy Outputs 1 and 2 Use the following steps to check the OUTPUT 1 and OUTPUT 2 accuracy 1 2 Press SHIFT OUT 1 verify that the 1 indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 1 terminals See Figure 2 for details T Power suppl Electronic load Digital multimeter al Figure 7 Constant voltage load test setup Set the DMM to measure 25 VDC Set up the power supply as follows VOLTS SET 20 V CURRENT SET 2 55 A OVP SET 22 V Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Enable the electronic load Adjust the load until the power supply CURRENT A readout indicates 2 500 A Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 15 16 17 18 19 20 Record the DMM voltage V1 Turn off the electronic load and record the DMM voltage again V2 Verify that the difference between V1 and V2 is lt 6 mV Press OUTPUT OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 1 terminals and connect them to the OUTPUT 1 terminals on the rear of the instru
169. utput is disabled Configure the DMM to measure 25 VDC across the front panel OUTPUT 1 2 terminals Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Verify that the DMM reads between 19 965 and 20 035 VDC Press VOLTS A or VOLTS V7 to adjust the power supply output voltage until the DMM reads 20 00 VDC Verify that the power supply VOLTS readout indicates between 19 965 and 20 035 V Press VOLTS SET Set the power supply output voltage to 0 1 V Set the DMM to measure 1 VDC across the power supply OUTPUT 1 2 terminals Verify that the DMM reads between 0 0749 and 0 1250 VDC Press OUTPUT ON OFF Verify that the OUT indicator turns off Bench Test Instruments and Handheld Oscilloscopes Basic Service 35 PS2520 and PS2521 Series Performance Verification 36 13 Press SHIFT OUT 2 verify that the 2 indicator lights up on the display 14 Repeat steps 2 through 12 above to measure the OUTPUT 2 voltage setting and readout accuracy Output 3 Use the following steps to check the OUTPUT 3 accuracy 1 Press SHIFT gt OUT 3 verify that the 3 indicator lights up on the display 2 Set up the power supply as follows VOLTS SET 6V OVP SET 7N 3 Press STEP SET Set the VOLTS SET to 0 05 V 4 Ensure that the power supply output is disabled Configure the DMM to measure 10 VDC across the power supply front panel OUTPUT 3 terminals 5 Press OUTPUT ON OFF Verify t
170. utput to the THM500 series instrument CH 1 and COM inputs using a 50 Q termination as shown in Figure 6 Assure that the ground connection for each adapter connects to the common or ground connector of its associated instrument 2 If necessary press the THM500 series instrument SELECT button to point to CH 1 Bench Test Instruments and Handheld Oscilloscopes Basic Service THMS00 Series Performance Verification 50 Q cable 50 Q termination lt BNC to dual banana cable Time Mark generator Figure 6 Time base accuracy test setup 3 Set the time mark generator for 1 us markers 4 On the THM500 series instrument press the POSITION SCALE button until the readout shows SCALE in the lower right corner Use the A and v buttons to set the vertical scale to 200 mV div Use the 4 and gt buttons to set the time base to 1 ps div 5 Use the THM500 series instrument menus to set CH 1 CPLG to DC then turn the menus off 6 Press the THM500 series instrument CURSORS TRIGGER button until the readout shows TRIG in the lower right corner then use the 4 and V buttons to set the trigger level to one division above the bottom of the displayed signal Use the lt or gt button to set the trigger to rising edge 7 Press the THM500 series instrument POSITION SCALE button until the readout shows POS in the lower right corner then use the button to set the trigger position to 10 8 Verify
171. v Linear range is 8 divisions from COM common Crosstalk Between Channels gt 100 1 at 5 MHz with other channel connected to COM common o o Bench Test Instruments and Handheld Oscilloscopes Basic Service 5 THM500 Series Specifications Table 3 Scope specifications cont Vertical Mathematics Acquisition Modes Acquisition Rate Horizontal Time Division Range 550 560 565 Sample Normal Spike Detect Roll Run Hold Smooth Dynamic DSP o o e All modes except Dynamic DSP Up to five waveforms per second Dynamic DSP Mode Up to 750 waveforms per second redisplayed at a slower rate Subtract CH 1 CH 2 Add CH 1 CH 2 60 s div to 200 ns div in a 1 2 5 sequence Time Base Accuracy 0 1 1 pixel Record Length 256 points Spike Detect Captures spikes down to 40 ns at all sweep speeds Single Shot Single shot on two channels simultaneously Roll 200 ms div to 60 s div Measurements Cursors Voltage difference between cursors AV Time difference between cursors AT Reciprocal of AT in Hertz 1 AT Voltage and Amperes For voltage or current probes Maximum MAX Minimum MIN Peak P eak P P Timing Frequency FREQ Period PER fe je Power Calculates true RMS current voltage true power and power factor from CH 1 current using current probe and CH 2 voltage THDF Transformer Harmonic Derating Factor calculated as RMS Current x 1 41414 Peak Curren
172. verify performance To confirm that your power supply meets factory specifications implement the procedures in the PS2520 and PS2521 Series Performance Verification section Use the adjustments listed in Table 8 to return PS2520 Series power supplies to factory calibration Table 8 PS2520 and PS2521 series adjustments Full Calibration Output 1 Output 2 Parallel Output Current Offset Parallel Output Current Full Scale Output 3 Partial Calibration Voltage Offset Voltage Full Scale Current Offset Current Full Scale Overvoltage P rotection Offset Overvoltage Protection Full Scale Bench Test Instruments and Handheld Oscilloscopes Basic Service 55 PS2520 and PS2521 Series Adjustment Procedures Test Equipment Table 8 PS2520 and PS2521 series adjustments cont Parallel Output Current Offset Parallel Output Current Full Scale To ensure accurate adjustments use the test equipment specified in Table 9 Alternative test equipment must meet or exceed the intended minimum requirements specified in Table 9 If you substitute equipment you may need to modify the procedures NOTE Before making any adjustment warm up the test equipment according to the manufacturer s recommendations Table 9 Adjustment test equipment Description Digital Multimeter Minimum requirements Example product 41 digit Tektronix DM2510 or DM25210G DC volts accuracy 0 05 DC ampere accuracy 0 896
173. verify the performance of your THM420 instrument perform the following checks in sequential order The following check verifies DC voltage measurement accuracy 1 Turn the THM420 rotary switch to V 5 2 Setthe DC AC button to DCV 3 Connect the voltage source output to the THM420 COM and the V O Hz inputs 4 Configure the voltage source to output DC 5 Set the controls of the THM420 and the voltage source to each of the values listed in Table 9 then verify that the THM420 readout remains within the readout limits Bench Test Instruments and Handheld Oscilloscopes Basic Service THM420 Performance Verification Table 9 DC voltage accuracy Readout limits THM420 range DC voltage source Minimum Maximum 400m V 300 0 mV 298 9 mV 301 1 mV 4V 3 000 V 2 989 V 3 011 V 40 V 30 00 V 29 89 V 30 11 V 400 V 300 0 V 298 9 V 301 1 V 850 V 450 V 441V 453 V 6 Disable the voltage source output 7 Do not disconnect the test setup AC Voltage The following check verifies AC voltage measurement accuracy 1 Set the THM420 DC AC button to ACV 2 Configure the voltage source to output AC 3 Set the controls of the THM420 and the voltage source to each of the values listed in Table 10 then verify that the THM420 readout remains within the readout limits Table 10 AC voltage accuracy AC voltage source Readout limits THM420 range Maximum 400 mV 300 0 mV 1 kHz 295 0 mV 305 0 mV 4V 50 Hz 2 965 V 3 035
174. wer supply as follows VOLTS SET 11V CURRENT SET 1 1A OVP SET 22 V DELAY 3s 5 Press SHIFT STORE gt 2 to store the above values in the memory 02 location Verify that the MEMORY CURRENT A and VOLTS readouts display the values listed in step 4 for memory location 02 6 Press SHIFT RECALL then enter 1 2 lt 7 Press RECALL LAST verify that the readouts display the data stored in the memory 02 location Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification 10 11 12 13 14 15 16 17 18 Press RECALL LAST again verify that the readouts now display the data stored in the memory 01 location Press RECALL NEXT verify that the readouts display the data stored in the memory 02 location Press OUTPUT ON OFF Verify that the OUT indicator lights up on the display Press AUTO SEQ ON OFF and verify that the AUTO indicator lights up on the display Verify that the front panel readouts alternately display the memory 01 and memory 02 setups from steps 2 and 4 above every three seconds Press AUTO SEQ ON OFF and OUTPUT ON OFF Verify that the AUTO and OUT indicators turn off Press STEP SET Set the VOLTS SET to 1 00 V Press VOLTS V7 and verify that as you attempt to decrease the voltage below 0 00 V Err 018 appears on the CURRENT A and VOLTS readouts The voltage should decrease in 1 volt s
175. with optional current probe The oscilloscope portion of the instruments feature an autoranging mode that completely automates operation In this mode a usable signal is always displayed without operator intervention If desired you can switch to manual mode by selecting any control In manual mode you can specify general oscilloscope operations such as coupling triggering and acquisition modes THM550 THM560 and THM565 models include preconfigured modes to set up the oscilloscope for motor testing transformer THDF measurement power line monitoring and power measurement The THM57x series instruments include preconfigured automotive test setups True RMS MultiMeter Auto Ranging Scope PRESS SELECT 1 300 Ve TO id 3 Won ww vac meer epe QN gt How Tektronix POSITION CURSORS WAVEFORM RUN Sf SCORE A SCALE TRIGGER IN OFF HOLD OQCOOOO Jt Figure 1 THM500 series instrument Bench Test Instruments and Handheld Oscilloscopes Basic Service 1 THM500 Series Instruments THM500 series instruments will also store waveforms settings and displays With these features you can do the following Recall settings Automate test procedures Save waveforms and screens in the field for later analysis Transfer waveforms and screens to a personal computer requires optional communications adapter Bench Test Instruments and Handheld Oscilloscopes Basic Service i Ae THM50
176. wn in Figure 2 Repeat steps 5 through 8 above and verify that the difference between V1 and V2 is lt 3 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Disconnect the DMM and electronic load from the instrument Series Operation Use the following steps to check the series mode output accuracy 1 With the power supply set to OUT 2 press SHIFT SERIES INDEP to configure OUTPUT 1 and OUTPUT 2 for series operation Verify that the SERIES indicator lights up on the display Ensure that the power supply output is disabled Connect the DMM and electronic load to the front panel OUTPUT 2 and OUTPUT 1 terminals Maintain the equipment configuration and polarities shown in Figure 2 Perform steps 5 through 8 of the Outputs 1 and 2 procedure above Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Performance Verification Verify that the difference between V1 and V2 is lt 50 mV Press OUTPUT ON OFF Verify that the OUT indicator turns off Ensure that the power supply output is disabled Remove the leads from the front panel OUTPUT 2 and OUTPUT 1 terminals and connect them to the OUTPUT 2 and OUTPUT 1 terminals on the rear of the instrument Maintain the equipment configuration and polarities shown in Figure 2 Repeat steps 5 through 8 of the Outputs 1 and 2 procedure above and verify that the difference between V1 and V2 is lt 50 mV P
177. xt step Ensure that good connections exist between the DMM and the power supply 7 Enter the calibration mode on the keypad a Press 1 for voltage calibrations b Press 2 for current calibrations Press 3 for overvoltage protection calibrations d Press 4 for parallel output calibrations 8 Press VOLTS A for offset calibration or press VOLTS V7 for full scale calibration 9 Verify that the readout displays the correct code for the desired calibration See Table 10 10 Press lt 4 on the power supply keypad to initiate the calibration Refer to the instructions below to complete each calibration Bench Test Instruments and Handheld Oscilloscopes Basic Service PS2520 and PS2521 Series Adjustment Procedures cL10 Voltage Offset Calibration To calibrate the voltage offset enter the DMM reading on the power supply keypad and press The readout will return to normal when the calibration is complete cL11 Voltage Full Scale Calibration To calibrate the full scale voltage adjust VR601 VR501 or VR401 using the instructions in Table 14 Refer to Figures 13 and 14 for the adjustment locations Enter the DMM reading on the power supply keypad and press The readout will return to normal when the calibration is complete Table 14 Voltage full scale adjustment partial calibration Instrument model PS2520 PS2520G PS2521 P52521G To cal OUTPUT 1 Adjust VR601 for a DMM reading of 37 00 V Adju
178. y on the oscilloscope display 5 Position the rising edge of the second time mark to the second vertical graticule line of the oscilloscope display 6 Verify that the time mark to graticule accuracy over the center eight divisions is within the limits shown for each HORIZONTAL SEC DIV setting listed in Table 15 Bench Test Instruments and Handheld Oscilloscopes Basic Service 15 TAS 200 Series Performance Verification Table 15 Standard time base accuracies HORIZONTAL Time marker Time mark to graticule accuracy SEC DIV setting over center 8 divisions lps 0 1 us 0 24 division us 0 2 us 0 24 division 5 uS 0 5 us 0 24 division 1 us 1 us 0 24 division 2 us 2 us 0 24 division 5 ys 5 us 0 24 division 10 us 10 us 0 24 division 20 us 20 us 0 24 division 50 us 50 us 0 24 division ms 0 1 ms 0 24 division 2 ms 0 2 ms 0 24 division 5 ms 0 5 ms 0 24 division lms lms 0 24 division 2ms 2ms 0 24 division 5 ms 5 ms 0 24 division 7 Setthe oscilloscope HORIZONTAL SEC DIV control to either 5 us TAS 220 or 1 us TAS 250 8 Setthe oscilloscope HORIZONTAL X10 MAG push switch to the on position in 9 Setthe time mark generator to 20 ns 10 Position the edge of the second time mark to the second vertical graticule line of the oscilloscope display 11 Verify that the time mark to graticule accuracy over the center eight divisions is within the limits shown for each

"Bench Test Instruments and Handheld Oscilloscopes Basic Service

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&quot;Bench Test Instruments and Handheld Oscilloscopes Basic Service

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"Bench Test Instruments and Handheld Oscilloscopes Basic Service