DAC Step: Step size for adjustments to the internal oscillator, as determ-
ined by the oscillator disciplining system. Larger steps = quicker, but
coarser adjustments. The step size is mainly determined by the type of oscil-
lator.
TFOM: The Time Figure of Merit is VersaSync’s estimation of how accur-
ately the unit is synchronized with its time and 1PPS reference inputs, based
on several factors, known as the Estimated Time Error or ETE. The larger
the TFOM value, the less accurate VersaSync believes it is aligned with its
1PPS input that is used to perform disciplining. If this estimated error is too
large, it could adversely affect the performance of oscillator disciplining.
The available TFOM range is 1 through 15.
Max TFOM for Sync: Value, as set under "Configuring the Oscillator" on
page223
Temperature(s): Three temperatures are displayed:
Oscillator temperature, which has an effect on oscillator accuracy,
and therefore can be used to interpret oscillator performance.
Board temperature (measured on the main board, sometimes also
referred to as 'System temperature')
CPU temperature
Note: Oscillator temperature is plotted over time in the
History panel on the right, while graphs for board and
CPU temperature can be found under TOOLS > SYSTEM:
System Monitor.
Last Time Reference Change: [Timestamp: Last occurrence]
Last 1PPS Reference Change: [Timestamp: Last occurrence]
Last TFOM Change: [Timestamp: Last occurrence]
Last Sync State Change: [Timestamp: Last occurrence]
Last Holdover State Change: [Timestamp: Last occurrence]
The Oscillator History Panel
The Oscillator History Panel offers real-time graphical monitoring of VersaSync’s
internal timing. The following graphs plot key oscillator-relevant data over time::
Phase Error Magnitude: See 1PPS Phase Error
Frequency Error: See 10_MHz_Frequency_Error
228
CHAPTER 3 • VersaSync User Manual Rev. 12
3.4 Managing the Oscillator
To Next Page
Loading...
