Filter
Top Products
Chapter 5 Command Reference
1 PPS Reference Synchronization
5-30 Operating and Programming Guide
Assessing 1 PPS Quality__________________________________
This query returns the Frequency Figure of Merit (FFOM). Use this query
when you want to know the stability of the Receiver’s 10 MHz output.
The 10 MHz output is controlled by the SmartClock’s Phase-Locked Loop
(PLL). Thus, the FFOM value is determined by monitoring the status of
the PLL.
Response
The following table lists and defines the FFOM values (0 thru 3) that could be
returned.
:SYNChronization:FFOMerit?
RESPONSE FORMAT
Returns the Frequency Figure of Merit.
±
dd
FFOM Value Definition
0 PLL stabilized—10 MHz output within specification.
1 PLL stabilizing
2 PLL unlocked (holdover)—Initially the 10 MHz output will be
within specifications. However, when in holdover, the 10 MHz
output will eventually drift out of specification.
3 PLL unlocked (not in holdover)—Do not use the output.