AMETEK APG-XT - Manual (Page 31)

Section 4. Calibration
Voltage Mode Calibration
49
Voltage Mode Calibration
Figure 4.1 Voltage Calibration Setup
Voltage
Program
1. Connect the unit to the digital voltmeter as shown in Figure 4.1 . See also
“Calibration Setup” on page 48 , step 4.
2. Program the output to 5% of full scale voltage by sending the following
command string from the computer:
VSET2;ISET25 (for 1kW Model 40-25)
3. Adjust voltage programming offset potentiometer R28 (VOFF) until the external
meter reading is within the power supply's voltage program accuracy
specification. Refer to specification tables in
Section 1 .
Example: ±75mV ±(0.3% (5% of 40V)) (for 1kW Model 40-25)
4. Program the output to full scale voltage by sending:
VSET40;ISET25 (for 1kW Model 40-25)
5. Adjust voltage programming full scale potentiometer R51 (VADJ) until the
external meter reading is within the power supply's voltage program accuracy
specification. Refer to specification tables in
Section 1 .
Example: ±75mV ±(0.3% of 40V) (for 1kW Model 40-25)
6. Repeat steps 2 to 5 (between VOFF and VADJ) for best linearity.
V
- +
VOLTMETER
Power Supply
Negative Output
Power Supply
Positive Output