Elgar SW5250A Service Manual download pdf (Page 48)

CALIBRATION TW SERIES

3-12

Set the TW to 320 Hz.

SOUR:FREQ 320.0

Wait for the DMM to settle and record the voltage as MEAS4.

Set the TW to 500 Hz.

SOUR:FREQ 500.0

Wait for the DMM to settle and record the voltage as MEAS5.

Set the TW to 60 Hz and open the output relay.

SOUR:FREQ 60.0

OUTPUT OFF

Calculate the calibration constants:

VALUE1 = 120.0 / MEAS1

VALUE2 = 120.0 / MEAS2

VALUE3 = 120.0 / MEAS3

VALUE4 = 120.0 / MEAS4

VALUE5 = 120.0 / MEAS5

Update the local low range frequency calibration of the TW by sending the following

GPIB string:

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

Close the TW’s output relay:

OUTPUT ON

Wait for the DMM reading to settle and record the value as RDNG1.

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

MEAS1.

MEAS{1,2,3}:VOLT?

Set the TW’s frequency to 80 Hz with the following GPIB command:

SOUR:FREQ 80.0

Wait for the DMM reading to settle and record the value as RDNG2.

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

MEAS2.

MEAS{1,2,3}:VOLT?

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Elgar SW5250A Service Manual Page 48