AMETEK APG-XT - Manual (Page 32)

Section 4. Calibration
Voltage Mode Calibration
50 Operating Manual for APG for XT/HPD Series Power Supply
Voltage
Readback
1. Connect the unit to the digital voltmeter (DVM) as shown in Figure 4.1 .
(Optional step)
2. Program the output to 5% of full scale by sending the following command string
from the computer:
VSET2;ISET25 (for 1kW Model 40-25)
3. Perform a readback operation of the output voltage from the computer:
VOUT?
4. Adjust the voltage readback offset potentiometer R50 (VZERO) until the
readback value is within specification. Refer to the voltage readback accuracy
specification in
Section 1 .
Example: ±75mV ± (0.3% (5% of 40V)) (for 1kW Model 40-25)
5. Program the output to full scale voltage by sending:
VSET40;ISET25 (for 1kW Model 40-25)
6. Adjust the voltage readback full scale potentiometer R49 (VGAIN) until the
readback voltage value is within specification. Refer to the voltage readback
accuracy specification in
Section 1 .
Example: ±75mV ± (0.3% of 40V) (for 1kW Model 40-25)
7. Repeat steps 2 (VZERO) to 5 (VGAIN) for best linearity.