Elgar SW5250A Service Manual download pdf (Page 38)

CALIBRATION TW SERIES

3-2

3.4 SETUP

In each calibration section the appropriate setup is listed for the calibration step.

WARNING

If the TrueWave is configured for International input power

(380 VAC 4-wire), ensure that the Neutral is connected and not

switched. If the Neutral connection is not made, severe damage

to the TrueWave may result.

Connect the appropriate input power to the TrueWave.

Once power is applied, the TrueWave system can be powered up by turning on the

switch located on the front panel. The power up sequence will take 5-10 seconds.

A 30-minute warm-up period of the TrueWave is recommended prior to calibration.

(A 15-minute warm-up period is required.)

3.5 CALIBRATION RESET

The initial step for calibration is to clear the unique existing calibration. This is

accomplished by sending the following GPIB commands to the TrueWave:

CAL:UNIQ:OPHA 0.0 0.0 0.0 0.0 0.0

CAL:UNIQ:OPHAB 0.0 0.0 0.0 0.0 0.0

CAL:UNIQ:MOPHAB 0.0 0.0 0.0 0.0 0.0

CAL:UNIQ:OPHAC 0.0 0.0 0.0 0.0 0.0

CAL:UNIQ:MOPHAC 0.0 0.0 0.0 0.0 0.0

CAL:UNIQ:GEXTG 1.0

CAL:UNIQ:OEXTG 0.0

The second step for calibration is clearing the phase specific calibration constants.

Each phase has its own calibration data. The {1,2,3} symbol should be replaced by 1,2

or 3. For a TW1750, only CAL1 constants need clearing. For a TW3500, CAL1 and

CAL2 must be cleared. For a TW5250, CAL1, CAL2 and CAL3 must all be cleared.

This is accomplished by sending the following GPIB commands to the TrueWave:

CAL{1,2,3}:OUTP:LOCAL:LOR:VOLT:GAIN 1.00

CAL{1,2,3}:OUTP:LOCAL:LOR:VOLT:OFFSET 0.0

CAL{1,2,3}:OUTP:LOC:LOR:VOLT:FREQCAL 1.0 1.0 1.0 1.0 1.0

CAL{1,2,3}:OUTP:LOCAL:HIR:VOLT:GAIN 1.00

CAL{1,2,3}:OUTP:LOCAL:HIR:VOLT:OFFSET 0.0

CAL{1,2,3}:OUTP:LOC:HIR:VOLT:FREQCAL 1.0 1.0 1.0 1.0 1.0

CAL{1,2,3}:OUTP:REMOTE:LOR:VOLT:GAIN 1.00

CAL{1,2,3}:OUTP:REMOTE:LOR:VOLT:OFFSET 0.0

CAL{1,2,3}:OUTP:REM:LOR:VOLT:FREQCAL 1.0 1.0 1.0 1.0 1.0

CAL{1,2,3}:OUTP:REMOTE:HIR:VOLT:GAIN 1.00

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Elgar SW5250A Service Manual Page 38