PS280 and PS283 Adjustment Procedures
Handheld and Benchtop Instruments Basic Service
17
Independent Mode Adjustments
Refer to Figures 6, 7, and 8 for the circuit board and adjustment locations used in
this procedure.
To adjust the MASTER voltage output, 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 AMPS/VOLTS meter selection switch to VOLTS.
3. Set the digital multimeter to measure a DC voltage of
±16 mV.
4. Set the PS280/PS283 MASTER VOLTAGE control to minimum (fully
counterclockwise).
5. Connect the digital multimeter to the + and – terminals of the MASTER
output.
6. Adjust VR102 (Master/Slave circuit board) for a reading of –15 mV, within
±15 mV on the multimeter.
7. Set the digital multimeter to measure a DC voltage of
±35 V.
8. Set the MASTER VOLTAGE control to maximum (fully clockwise).
9. Adjust VR101 (Master/Slave circuit board) for a reading of 31.5 V on the
multimeter.
10. Adjust VR201 (Display Assembly circuit board) until the PS280/PS283
front panel display reads 31.5 V.
11. Disconnect the digital multimeter from the power supply.
VR502
VR303
VR301
VR306
VR302
VR103
VR101
VR102
Figure 7: Master/Slave Circuit Board Adjustments
MASTER Voltage Output
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