Tektronix TG700, Руководство пользователя

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GPS7 GPS Synchronization and Timecode Module
Information about the Oven Calibration menu is available in the CAL OVEN
Submenu section. (See page 2-28.)
NOTE.
Perform the mainframe internal frequency calibration at least once a year
to compensate for oscillator drift. With software version 5.1 or greater and a
GPS7 module installed, this calibration can be done while the instrument is in
service.
WARNING.
Dangerous electric shock hazards exist inside the TG700 mainframe.
Only quali fi ed service personnel should perform these procedures. Failure to use
appropriate precautions can result in injury or death.
Internal frequency calibration.
Perform the following procedure to set the internal
frequency of the mainframe internal oscillator. This adjustment stores the current
frequency of the oscillator while it is locked to a GPS signal. It is stored for used
when the instrument is set to
Internal mode. This procedure can be done without
any disruption to operation and is best performed in the operating environment
of the instrument.
1. Connect the power cord to the TG700 mainframe.
2. Check for error messages as the instrument starts.
3. Connect a GPS signal to the rear of the module.
4. Allow the instrument to warm up for a minimum of 20 minutes.
5. Press the MODULE button until GPS7 : STATUS appears.
6. Check that the signal status shows Locked .
7. Check that signal lock indicator displays Fine :
a. Press the up ( ▲ ) arrow button to select DIAGNOSTICS .
b. Press the ENTER button.
c. Press the right ( ► ) arrow button to select TUNE .
d. Check that Fine is showing on the right side of the LCD display.
8. Press the MODULE button until TG700 appears.
9. Press the up ( ▲ ) arrow button to select UTILITY .
10. Press the ENTER button.
11. Press the up ( ▲ ) arrow button to select CAL OVEN : SELECT .
12. Press the ENTER button to access the Internal Frequency Calibration
submenu.
TG700 TV Signal Generator Platform User Manual 3–99