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Calibration
Current Mode Calibration
Current Mode Calibration
Current
1. Disconnect the load from the power supply to be calibrated.
Calibration
2. Connect a shunt across the supply's output terminals.
Setup
3. Connect a voltmeter across the shunt.
Figure 4.2 Current Calibration Setup
Current
1. Connect the shunt and voltmeter to the power supply as shown in Figure 4.2.
Program
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to
Calibration
Procedure
3. Send command ILO; VLO to the power supply. Measure and record the output
4. Send command IHI; VHI to the supply Measure and record the output voltage
5. Calculate ILO and IHI from the voltages read from the external voltmeter and
6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are
7. Program the supply at various levels using the ISET command to confirm that
8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0
54
the power supply.
shown on the external voltmeter.
shown on the external voltmeter.
the shunt resistance. I=V/R.
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.
the calibration was successful and that linearity is observed. Refer to the current
program accuracy specification in Section 1.
to the power supply.
Power Supply
Power Supply
Positive Output
Negative Output
Current Sensing
Resistor
V
-
+
VOLTMETER
Operating Manual for RS-232 for XPD Series Power Supply
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