Xantrex Technology RS232-XPD - Manual (Page 54)

Calibration
Voltage Mode Calibration
52 Operating Manual for RS-232 for XPD Series Power Supply
Voltage Mode Calibration
Voltage
Calibration
Setup
1. Disconnect the load from the power supply which is to be calibrated.
2. Connect a voltmeter across the power supply’s output terminals.
Figure 4.1 Voltage Calibration Setup
Voltage
Program
Calibration
Procedure
1. Set the power supply for calibration as in Figure 4.1.
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to
the power supply.
3. Send command VLO; ILO to the power supply. Measure and record the output
shown on the external voltmeter.
4. Send command VHI; IHI to the supply. Measure and record the output voltage
as shown on the external voltmeter.
5. Send the command VDATA , where and are the values
read from the voltmeter when the VLO and VHI commands were sent. When the
power supply is calibrated, the low to high voltage program calibration values
are stored as constants.
6. Program the supply at various levels using the VSET command to confirm that
the calibration was successful and that linearity is observed. See the voltage
program accuracy specification in Section 1.
7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0
to the power supply.
V
- +
VOLTMETER
Power Supply
Negative Output
Power Supply
Positive Output