Elgar SW5250A Service Manual download pdf (Page 70)

CALIBRATION TW SERIES

3-34

Query the TW’s watts using the GPIB string below, and record this value as MEAS4.

MEAS{1,2,3}:POW?

Program the TW to 500 Hz using the string below:

SOUR{1,2,3}:FREQ 500

Wait until the power analyzer has stabilized and record the watts reading as RDNG5.

Query the TW’s watts using the GPIB string below, and record this value as MEAS5.

MEAS{1,2,3}:POW?

Program the TW to 60 Hz, output off using the string below:

SOUR{1,2,3}:FREQ 60

OUTP OFF

Calculate the calibration constants:

VALUE1 = RDGN1/MEAS1

VALUE2 = RDGN2/MEAS2

VALUE3 = RDGN3/MEAS3

VALUE4 = RDGN4/MEAS4

VALUE5 = RDGN5/MEAS5

Update the TW’s calibration data:

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

3.24 REMOTE LOW RANGE WATTS FREQUENCY CALIBRATION

Connect the 12 ohm resistor to the output of the TW through the power analyzer. Set

up the power analyzer to measure watts.

Set up the TW to AC coupling, low range, remote sense, 40 Hz, 13 ampere current

limit, output relay closed and 120 volts with the following GPIB programming strings:

OUTP:COUP AC

SOUR:VOLT:RANGE LOW

SOUR:SENSE REMOTE

SOUR:FREQ 40

SOUR{1,2,3}:CURR 13.00

OUTPUT ON

SOUR{1,2,3}:VOLT 120

Wait until the power analyzer has stabilized and record the watts reading as RDNG1.

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Elgar SW5250A Service Manual Page 70