Xantrex RS232-XPD Manuel d'utilisateur télécharger pdf (Page 56)

Calibration

Current Mode Calibration

54 Operating Manual for RS-232 for XPD Series Power Supply

Current Mode Calibration

Current

Calibration

Setup

1. Disconnect the load from the power supply to be calibrated.

2. Connect a shunt across the supply's output terminals.

3. Connect a voltmeter across the shunt.

Figure 4.2 Current Calibration Setup

Current

Program

Calibration

Procedure

1. Connect the 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 ILO; VLO to the power supply. Measure and record the output

shown on the external voltmeter.

4. Send command IHI; VHI to the supply Measure and record the output voltage

shown on the external voltmeter.

5. Calculate ILO and IHI from the voltages read from the external voltmeter and

the shunt resistance. I=V/R.

6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are

the current values obtained from sending the ILO and IHI commands to the

power supply. When the power supply is calibrated, the low to high current

program 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

program accuracy specification in Section 1.

8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0

to the power supply.

VOLTMETER

Power Supply

Negative Output

Power Supply

Positive Output

Current Sensing

Resistor

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Xantrex RS232-XPD Manuel d'utilisateur Page 56