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AMETEK ReFlex User Manual

Page 308

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ReFlex Power™

Active Loads

M380056-01 Rev J

7-33

1. Connect the shunt between the DC power supply and the active load.

Connect the DC current meter across the shunt.

2. Issue clear and reset commands:

*CLS

*RST

3. Set the DC power supply to 4.5 Volts

4. This begins the CalPots calibration sequence. The Load will be set to

STATE 1; relays closed and set to 0 current, the 0 current offset value will
be calculated.

CAL:CALPOTS:GAIN:START

5. Program to draw maximum current:

CAL:INP:CURR:COUNTS 0xFFFF

6. Adjust the current limit on the DC Power supply to just under the limit 27.4

Amps. Use the Current Shunt and Voltmeter to adjust and measure the
current. When the current reading is stable, enter the current using
following command:

CAL:CALPOTS:GAIN:CURR

7. This will use the current value entered to adjust the Gain Pot. The

adjustment will be calculated, ending the procedure and the setting the
load to STATE 0:

CAL:CALPOTS:GAIN:CALC

8. Send the system error query command to make sure calibration was

successful:

SYST:ERR?

9. If there is no error returned at the system error query command then save

the calibration result with the following command:

CAL:UNLOCK “6867”

CAL:STORE

CAL:LOCK

10. Optional Commands:

To query the offset pot set value: CAL:CALPOTS:OFFSET?

To query the gain pot set value: CAL:CALPOTS:GAIN?

11. Reset the unit:

*RST

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