Table A-1. Calibration Commands

Command

Header

Channel*

Data

Syntax

 

 

Range

 

(see Figure 5-2)

Calibration Mode

CMODE

 

0,1 (off,on)

C2

Set High Voltage

VHI

1,2,3,4

-

C3

Set Low Voltage

VLO

1,2,3,4

-

C3

Set High Current

IHI

1,2,3,4

-

C3

Set Low Current

ILO

1,2,3,4

-

C3

Calibrate Overvoltage

OVCAL

1,2,3,4

-

C3

Voltage Data

VDATA

1,2,3,4

see Table A-2

C5

Current Data

IDATA

1,2,3,4

see Table A-2

C5

*Channels 3 and 4 are not used in all models.

Table A-2. Voltage and Current Data Ranges

 

Voltage Range in Volts

Current Range in Amps

 

 

Vlo

 

Vhi

llo

 

 

Ihi

Output

Min

Max

Min

Max

Min

Max

Min

Max

40 W Low Voltage

0

0.1

18.5

20.5

0

0.15

4.5

5.3

40 W High Voltage

0.04

0.20

44

48

0

0.1

1.5

2.1

80 W Low Voltage

0

0.1

18.5

20.5

0.05

0.25

9

10.5

80 W High Voltage

0.04

0.20

44

48

0

0.1

3.5

4.2

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.

Start with output channel 1 and use the following commands to calibrate your power supply:

Calibration Procedures 91