AMETEK APG-XT - Manual (Page 33)

Section 4. Calibration
Current Mode Calibration
51
Current Mode Calibration
Figure 4.2 Current Calibration Setup
Current
Program
1. Ensure the current shunt has been connected to the power supply as shown in
Figure 4.2 . See also “Calibration Setup” on page 48 , step 4.
2. Program the output to 5% of full scale current by sending the following
command string from the computer:
VSET40;ISET1.25 (for 1kW Model 40-25)
3. Adjust current programming offset potentiometer R27 (IOFF) until the meter
reading is within the power supply's current program accuracy specification.
Refer to specification tables in
Section 1 .
Example: ±140mA ± (0.15% (5% of 25A)) (for 1kW Model 40-25)
4. Program the output to full scale current by sending:
VSET40;ISET25 (for 1kW Model 40-25)
5. Adjust current programming full scale potentiometer R47 (IADJ) until the meter
reading is within the power supply's current specification. Refer to specification
tables in
Section 1 .
Example: ±140mA ± (0.15% of 25A) (for 1kW Model 40-25)
6. Repeat steps 2 to 5 (between IOFF and IADJ) for best linearity.
V
- +
VOLTMETER
Power Supply
Negative Output
Power Supply
Positive Output
Current Sensing
Resistor