PS280 and PS283 Adjustment Procedures
Handheld and Benchtop Instruments Basic Service
19
6. Adjust VR103 (Master/Slave circuit board) for a reading of 1.05 A (PS283)
or 2.1 A (PS280) on the multimeter.
7. Adjust VR202 (Display Assembly circuit board) until the PS280/PS283
front panel display reads 1.05 A (PS283) or 2.1 A (PS280).
8. Disengage both TRACKING mode switches (both switches out) so that the
power supply is in the INDEPendent operating mode.
9. Set the SLAVE AMPS/VOLTS meter selection switch to AMPS.
10. Set the digital multimeter to measure a DC current of 2 A.
11. Connect the digital multimeter to the + and – terminals of the SLAVE
output.
12. Set the SLAVE CURRENT control to maximum (fully clockwise).
13. 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.
To adjust the series tracking mode, perform the following steps.
1. 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.
2. Set the SLAVE CURRENT control to midrange.
3. Set the MASTER VOLTAGE control to minimum (fully counterclockwise).
4. Set the digital multimeter to measure a DC voltage of
±16 mV.
5. Connect the digital multimeter to the + and – terminals of the MASTER
output and note the reading obtained.
6. Connect the digital multimeter to the + and – terminals of the SLAVE
output.
7. Adjust VR306 (Master/Slave circuit board) until the voltage output of the
SLAVE output matches the reading obtained from the MASTER output.
8. Set the MASTER VOLTAGE control to maximum (fully clockwise).
9. Set the digital multimeter to measure a DC voltage of
±35 V.
SERIES Tracking
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