Current
Readback
Calibration
Procedure
Calibration
Current Mode Calibration
1.Connect the current 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 IRLO; VRLO to the power supply. Wait for the supply to settle. Measure and record the output voltage shown on the external voltmeter. Send IRLO again.
4.Send command IRHI; VRHI to the supply. Wait for the supply to settle. Measure and record the output voltage shown on the external voltmeter. Send IRHI again.
5.Calculate IRLO and IRHI from the voltages taken from the external voltmeter and the shunt resistance. I=V/R.
6.Send the command IRDAT <ilo>,<ihi> to the power supply. <ilo> and <ihi> are the current values obtained from sending the IRLO and IRHI commands to the power supply. When the power supply is calibrated, the low to high current readback 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 readback accuracy specification in Section 1.
8.Turn off calibration mode by sending the command CMODE OFF or CMODE 0 to the power supply.
Release 3.1 | 59 |
