Operating basics
CAL OVEN submenu
(GPS7 module only)
Use this menu to
set the internal frequency of the mainframe internal oscillator.
This may be done without removing the instrument from service, allowing you to
compensate for oven drift while the instrument is in its operating environment.
This menu only appears when there is a GPS7 module installed.
The mainframe oscillator is calibrated by storing the current frequency of the
oscillator while it is locked to GPS and/or GLONASS or a reference video signal.
NOTE. Perform the mainframe internal frequency calibration at least once a year
to compensate for oscillator drift. With a GPS7 module installed, this calibration
can be done
while the instrument is in service.
If your GPS7 module is installed in a TG700 mainframe, you need to also
characte
rize the oscillator frequency as a function of voltage. Refer to the TG700
User Manual for more information (Tektronix part number 071-1970-XX).
The foll
owing fi gure shows the CAL OVEN submenu. You can find a complete
internal frequency calibration procedure in the Oven Calibration Procedures
section. (See page 3-100.)
Figu
re 2-29: Internal frequency calibration menu
Pre
ss the ENTER button to execute the oscillator frequency calibration routine or
press the BACK button to exit the menu.
CAUTION. To prevent a n incorrect oscillator frequency from being stored as the
calibrated value, be sure that the instrument is locked to one of the following
signal sources before you run the internal frequency calibration routine:
Rubidium clock, GPS and/or GLONASS antenna (GPS7 module only), or the
m
aster sync signal of your video installation. To run the gain calibration, the
instrument must be locked to a GPS and/or GLONASS reference.
TG8000 Multiformat Test Signal Generator User Manual 2–47
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