Operating basics
Mainframe DIAGNOSTICS
submenu
Usethismenuto
view diagnostic readouts and to execute the diagnostic routines
for the mainframe and installed modules. The following figure shows the
DIAGNOSTICS submenu.
Figure 2-
28: Mainframe DIAGNOSTICS submenu
TUNE. Displays how far the TG8000 system is deviating from the calibrated
internal frequency of the mainframe oscillator in order to lock to an external
reference input. One value of this readout is to determine if the instrument
oscill
ator needs t o be calibrated. If the instrument is locked to a traceable
reference, then any tune value indicates error in the instrument calibration. For
example, if the instrument is locked to GPS and/or GLONASS a nd the Tune
readout is more than ±0.1 e-6, then you should consider calibrating the internal
frequency of the instrument. This can be performed while the instrument is in
service with no disruption to the operation. (See page 2-47, CAL OVEN submenu
(GPS
7 module only).)
The first part of the Tune readout indicates the fractional amount of deviation
fro
m the calibrated frequency. For example, if you u se a GPS7 or AGL7 module
to lock to a video source that is 5 parts per million high, then the readout will say
“+5.00e-6”. This allows you to measure the frequency of the reference input and
to see if the input is near the end of the available tuning range. If the TG8000
system is in internal reference mode, the tune value should be 0.00 e-6 and the
integer values will equal the ca libration value (CAL readout).
N
OTE. The TUNE display will show non-zero deviation values only when
an AGL7 or GPS7 module is installed and the signal reference setting is not
configured as INTERNAL.
TG8000 Multiformat Test Signal Generator User Manual 2–43
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