Tektronix TG8000 User Manual page 302

GPS7 GPS Synchronization and Timecode module
GPS7 module
DIAGNOSTICS submenu
3–152
Use this menu to view operation parameters for the GPS7 module. Because many
sync sources are never turned off, it makes sense to check them periodically.
These menus allow access to some internal nodes to forewarn of impending
problems. Module diagnostics provide status information only and do not affect
operating behavior. The following figure shows the DIAGNOSTICS submenu.
Figure 3-76: GPS7 module DIAGNOSTICS submenu
TEMPERATURES. This diagnostic displays the temperature of the GPS receiver
on the GPS7 module.
NOTE.
For GPS7 modules with a GPS/GLONASS receiver, the temperature
readout is N/A because there is no temperature sensor on the receiver. (See
page 3-102, How to determine which GPS receiver is installed in your GPS7
module.)
TUNE. This diagnostic displays the following:
Phase – The phase between the GPS pulse per second and the internal master
time. A Tektronix Customer Service Representative may request these values
for troubleshooting installation issues, should they occur.
DAC – The DAC code that is tuning the oscillator. Useful for checking if a
unit is getting close to the end of the oven oscillator tune range.
GPS lock indicator – Displays the GPS/GLONASS lock state. When Boot is
displayed, it means the function is still in special modes needed to get started.
When Coarse is displayed, it means the function is still tracking significant
changes in the timing. When Fine is displayed, it means the function has
stabilized to the point that the loop only needs to make small changes.
VOLTAGE MON 1. This diagnostic measures internal voltage supplies. If these
supplies are outside the nominal range, Warning appears, which means that the
instrument should be serviced.
VOLTAGE MON 2. This diagnostic measures a voltage divider between a positive
and negative supply. If this diagnostic result is outside the nominal range,
Warning appears, which means that the instrument should be serviced.
TG8000 Multiformat Test Signal Generator User Manual