Cal Power TrueWave TW5250, Service Manual

Page: 70 / 84

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 .