General Calibration Procedure - Agilent Technologies 6621A Operating Manual

Command
Calibration Mode
Set High Voltage
Set Low Voltage
Set High Current
Set Low Current
Calibrate Overvoltage
Voltage Data
Current Data
*Channels 3 and 4 are not used in all models.
Output
40 W Low Voltage
40 W High Voltage
80 W Low Voltage
80 W High Voltage

General Calibration Procedure

This procedure causes the voltage of the specified output to go to full scale value. Take appropriate
precautions.
The following general procedure applies to any computer that you are using to control your power supply. This procedure
must be repeated for each output on your power supply. The calibration commands shown are the actual string commands
that must be sent to the power supply. Because the power supply will attempt to calibrate itself even when incorrect or
invalid readings are sent to it, it is recommended that you perform some type of error checking after steps 4, 5, and 8 to
ensure that the values sent to the supply are legitimate. Use the ranges in Table A-2 as a guide. If an error is detected while
in calibration mode, send CLR or turn the supply off to maintain the previous calibration constants. This will prevent
incorrect constants from being stored. See Table 5-8 for a list of errors.
Before you continue with this procedure, disconnect all loads from the supply, strap the supply for local sensing, and
connect the voltmeter to the + S and - S terminals as shown in the voltage calibration setup of Figure A-1.
Table A-1. Calibration Commands
Header Channel*
Range
CMODE
VHI 1,2,3,4
VLO 1,2,3,4
IHI 1,2,3,4
ILO 1,2,3,4
OVCAL 1,2,3,4
VDATA 1,2,3,4
IDATA 1,2,3,4
Table A-2. Voltage and Current Data Ranges
Voltage Range in Volts
Vlo Vhi
Min Max Min
0 0.1 18.5
0.04 0.20 44
0 0.1 18.5
0.04 0.20 44
Data
(see Figure 5-2)
0,1 (off,on)
-
-
-
-
-
see Table A-2
see Table A-2
Current Range in Amps
llo
Max Min Max
20.5 0 0.15
48 0 0.1
20.5 0.05 0.25
48 0 0.1
Syntax
C2
C3
C3
C3
C3
C3
C5
C5
Ihi
Min Max
4.5 5.3
1.5 2.1
9 10.5
3.5 4.2
Calibration Procedures 91