888-2406-002 4-35
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
Calibration Factors:
• Forward Factor - 0.003079
• Reflect Factor - 0.000123
• APC_Factor - 3.03
• EXC_Factor - See Factory Test Data (Frequency dependent)
• IPA_Factor - See Factory Test Data (Frequency dependent)
A/D Readings
• DAC_APC_REF - 660 (nominal)
• A/D_FWD_PWR - 806 (nominal @ 2kW))
• A/D_RFL_PWR - 700 (nominal @ 60W reflected)
These cal factors and A/D values will be approximately the same for all Z2
transmitters that are factory calibrated or have been field calibrated at the rated
transmitter power of 2kW as detailed in the Maintenance procedures. These
numbers are also stored in the Backup memory area of the EEPROM, U39 and can
be recalled if necessary. The actual numbers obtained during the factory calibration
are recorded in the Factory Test Data.
NOTE:
If the transmitter is calibrated at other than 2kW these numbers will change
and their new values should be recorded.
It is important to note that as long as the hardware calibration of the forward and
reflected directional couplers is not disturbed, the Cal Factors could be entered
manually and the transmitter calibration would be within a few percent of the
factory calibration. To access the edit controls for each parameter, go to the screen
containing the value and press and hold the [D] and press [C]. The edit controls
should now show up on the screen.
!
CAUTION:
ENTERING A WRONG VALUE IN ONE OF THESE SCREENS COULD
CAUSE SERIOUS DAMAGE TO THE TRANSMITTER OR EXTERNAL
SYSTEMS. IT IS RECOMMENDED THAT THESE NUMBERS BE RECALLED
FROM THE BACKUP MEMORY OR BE OBTAINED BY FOLLOWING THE
CALIBRATION PROCEDURES AS OUTLINED IN SECTION V,
MAINTENANCE.
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