Calibration
Current Mode Calibration
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.
Power Supply | Power Supply |
Positive Output | Negative Output |
Current Sensing
Resistor
Current
Program
Calibration
Procedure
+V 
-
VOLTMETER
Figure 4.2 Current Calibration Setup
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.
7.Program the supply at various levels using the ISET command to confirm that the calibration was successful and that linearity is observed. Refer to the current program accuracy specification in Section 1.
8.Turn off calibration mode by sending the command CMODE OFF or CMODE 0 to the power supply.
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