A
Calibration Procedures
Introduction
This appendix discusses the software calibration procedures for the power supply. These supplies should be calibrated annually or whenever certain repairs are made (see Service Manual).
Because there are no internal or external hardware adjustments, your power supply can be calibrated without removing the covers or removing it from the cabinet if it is rack mounted. Calibration is performed by measuring actual output values and sending them to the supply over the
Correction constants for offset and full scale voltage and current values are stored for one output channel at a time. A separate calibration command calculates and stores correction constants for the internal overvoltage circuit. This appendix lists the equipment that you need, shows the test setup to perform the calibration, gives a general calibration procedure that explains all of the calibration commands, and gives a sample program you can use if you have a HP 3456A voltmeter and a HP Series 200/300 computer with BASIC.
Security against accidental calibration is available. A jumper inside the unit may be moved to disable all calibration commands. Access to this jumper requires opening the unit (see the Service Manual).
Tables
NOTE | The memory used to store correction constants will accept and store data about 10,000 times, which is |
| more than sufficient for normal calibrations over the life of the instrument. However, do not put the unit |
| in a calibration loop that repeatedly turns the calibration mode on and off. |
Test Equipment and Setup Required
The following test equipment is required for calibration:
1.A computer connected to the
2.A voltmeter accurate to 0.003% of reading.
3.A precision 0.1 Ω, ±0.05%, 10 amp shunt resistor (4 terminal).
Figure
Calibration Procedures 89