TB 9-6625-2358-50
8. Power Accuracy
a. Performance Check
(1) Insert calibration software disc (p/o Power Meter Calibration Kit, Bird Electronic
Corporation, Model 4421A500) in floppy drive.
(2) Run software by left clicking with mouse in the following sequence: Start, Run...,
then type "a:\install.exe", then click OK. A dos screen will appear. Type "c:21" then
press "Enter" on keyboard.
(3)
Type "a" when "Install drive= _:" appears then press "Enter" on keyboard.
(4) Press "n" to not modify autoexec.bat file. Calibration software is loaded on the
instrument controller.
(5) Click on "Start", click on "Programs", click on "National Instruments", and click
"Measurement & Automation".
(6)
Click on "Tool", click "NI-488.2", and click "DOS Support".
(7)
Check "Enable Support for DOS NI-488.2 Application", and then click "OK".
(8)
Click "Start", then click "Run...", type "4421/calib", press "ENTER" on keyboard.
(9) When prompt to open new file, press "Y" on the controller keyboard and follow
screen prompts.
setting in table 4, 5, or 6 that correspond to the directional power sensor being calibrated.
CAUTION
Ensure that RF power is off before making any band
changes to the band pass filter.
(11) Adjust RF power amplifier GAIN and LEVEL SET controls fully clockwise and
RF BAND switch to LOW.
(12) Set signal generator amplitude control for an indication of 35 to 50 watts on the
RF power meter. RF power meter indication and calorimeter indication differences will be
4 % or less. If not, perform paragraph b below.
(13) Repeat steps (4) through (6) above for the remainder of tables 4, 5, or 6 that
correspond to the directional power sensor being calibrated.