Elgar SW5250A Service Manual download pdf (Page 55)

SERVICE MANUAL CALIBRATION

3-19

Query the TW’s output put voltage with the GPIB string below and record this value as

MEAS5.

MEAS{1,2,3}:VOLT?

Set the TW’s frequency to 60 Hz and open the output with the following GPIB

commands:

SOUR:FREQ 60.0

OUTP OFF

Calculate the measurement system frequency compensation values:

VALUE1 = RDGN1 / MEAS1

VALUE2 = RDGN2 / MEAS2

VALUE3 = RDGN3 / MEAS3

VALUE4 = RDGN4 / MEAS4

VALUE5 = RDGN5 / MEAS5

Update the TW’s calibration data with the following GPIB command:

CAL{1,2,3}:MEAS:REM:LOR:VOLT:FREQCAL VALUE1 VALUE2 VALUE3 VALUE4 VALUE5

3.14 REMOTE HIGH RANGE FREQUENCY CALIBRATION

Connect the TW output to the DMM. Set the DMM up for auto–ranging AC voltage.

Set the TW into AC coupling, remote sense, 40 Hz, 120V, and high range by sending

the following GPIB strings:

OUTP:COUP AC

SOUR:VOLT:RANGE HIGH

SOUR:SENSE REMOTE

SOUR:FREQ 40.0

SOUR{1,2,3}:VOLT 240.00

Close the TW’s output relay:

OUTPUT ON

Wait for the DMM to settle and record the voltage as MEAS1.

Set the TW to 80 Hz.

SOUR:FREQ 80.0

Wait for the DMM to settle and record the voltage as MEAS2.

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Elgar SW5250A Service Manual Page 55