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Calibration
4–4 TM-XR9B-01XN
Voltage Readback 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 VRLO; IRLO to the power supply. Wait for the
supply to settle. Measure and record the output shown on the external
voltmeter. Send VRLO again.
4. Send VRHI; IRHI to the supply. Wait for the supply to settle.
Measure and record the output voltage shown on the external
voltmeter. Send VRHI again.
5. Send the command VRDAT <vlo>,<vhi> where <vlo> and <vhi> are
the values read from the voltmeter after the VRLO and VRHI
commands were sent. The processor calculates the offset value
required to calibrate the power supply. When the power supply is
calibrated, the low to high voltage readback calibration values
(offsets) are stored as constants.
6. Use commands VSET and VOUT? commands to confirm that the
calibration was successful and that linearity is observed. Refer to the
voltage readback accuracy specification in Appendix A.
7. Turn off calibration mode by sending the command CMODE OFF or
CMODE 0 to the power supply.
TM-XR9B-01XN.book Page 4 Monday, April 19, 2004 9:00 AM