Elgar SW5250A Service Manual download pdf (Page 58)

CALIBRATION TW SERIES

3-22

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:HIR:VOLT:FREQCAL VALUE1 VALUE2 VALUE3 VALUE4 VALUE5

3.15 EXTERNAL PHASE REFERENCE CALIBRATION

Connect the counter timer channel 1 to the TW’s A phase through a 10:1 resistor

divider. Connect the counter timer channel 2 to the TW’s clock/lock/sync BNC. Set the

counter time up to measure phase angle.

Set up the TW for the external refout, low range, local sense, 40 Hz, 120 V and close

the output relay by sending the following GPIB commands:

SYST:EXT:CLOCK REFOUT

SOUR:VOLT:RANGE LOW

SOUR:SENSE LOCAL

SOUR:FREQ 40.0

SOUR:VOLT 120.00

OUTPUT ON

Wait for the phase angle measurement to stabilize on the counter timer. Record the

phase angle as RDGN1.

Set the TW frequency to 80 Hz:

SOUR:FREQ 80.0

Wait for the phase angle measurement to stabilize on the counter timer. Record the

phase angle as RDGN2.

Set the TW frequency to 160 Hz:

SOUR:FREQ 160.0

Wait for the phase angle measurement to stabilize on the counter timer. Record the

phase angle as RDGN3.

Set the TW frequency to 160 Hz:

SOUR:FREQ 160.0

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Elgar SW5250A Service Manual Page 58