Chapter 4
1PPS Wander Analysis
Impact on oscillator tuning
T-BERD/MTS 5800 Timing Expansion Module User Manual
July 2017
22112315, Rev. 004
Page 41
cates that the module is in 1PPS Analysis mode, and that the oscillator has been placed
into Holdover mode.
Impact on oscillator tuning
If the TEM oscillator has reached Fine Tune mode, after you put the TEM into 1 PPS
Analysis mode the oscillator is automatically placed into Holdover mode. If you run a
concurrent application on your 5800v2 instrument (using the TEM oscillator as a high
accuracy timing reference), the PPS Offset and 10MHz frequency will naturally drift
over time.
This is expected behavior
.
Monitoring oscillator drift
You can monitor the time remaining before the frequency drifts to an unacceptable level
by configuring the maximum acceptable drift. The module will then estimate the time
remaining before the oscillator drifts to an unacceptable level, and provide the time
remaining in the Oscillator results category. For details, see
“Oscillator Results” on page 58
Using a GNSS tuned oscillator
You can use a GNSS tuned oscillator as a reference when performing 1 PPS wander
analysis; however, if the GNSS synchronization source is lost, the GNSS reference will
Figure 7
1 PPS Analysis LEDs
