Xantrex ENET-XFR, Operating Manual

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Current Mode Calibration
TM-XR9B-01XN 4–5
Current Mode Calibration
Current Calibration Setup
1. Disconnect the load from the power supply to be calibrated.
2. Connect a shunt across the supply's output terminals.
3. Connect a voltmeter across the shunt.
Current Program Calibration Procedure
1. Connect the shunt and voltmeter to the power supply as shown in
Figure 4-2 .
2. Activate calibration mode by sending command CMODE ON or
CMODE 1 to the power supply.
3. Send command ILO; VLO to the power supply. Measure and record
the output shown on the external voltmeter.
4. Send command IHI; VHI to the supply Measure and record the output
voltage shown on the external voltmeter.
5. Calculate ILO and IHI from the voltages read from the external
voltmeter and the shunt resistance. I=V/R.
6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo>
and <ihi> are the current values obtained from sending the ILO and
IHI commands to the power supply. When the power supply is
calibrated, the low to high current program calibration values are
stored as constants.
Figure 4-2 Current Calibration Setup
V
-
+
VOLTMETER
Power Supply
Negative Output Power Supply
Positive Output
Current Sensing
Resistor
TM-XR9B-01XN.book Page 5 Monday, April 19, 2004 9:00 AM