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Chapter 5 Command Reference
1 PPS Reference Synchronization
5-32 Operating and Programming Guide
Assessing 1 PPS Quality ________________________
(continued)
This query returns the Time Figure of Merit. Use this query when you want to
know the accuracy of the Receiver’s 1 PPS output. A low TFOM value indicates
a more accurate output. A value of 3 indicates that the Time Error ranges from
100 to 1000 nanoseconds.
Response
The following table lists the TFOM values that could be returned and provides
the corresponding Time Error.
This query returns the difference or timing shift between the SmartClock
1 PPS and the GPS 1 PPS signals. It generates an error when this interval is
unavailable (That is, if no GPS 1 PPS).
Response
Time interval units are seconds.
Resolution is 1E-10 seconds.
:SYNChronization:TFOMerit?
RESPONSE FORMAT
Returns the Time Figure of Merit.
±
dd
TFOM Value Time Error
(in nanoseconds)
TFOM Value Time Error
(in nanoseconds)
0
*
* The TFOM values 0, 1, and 2 are not presently used in the 58503B and 59551A products. The
58503B and 59551A products will display TFOM values ranging from 9 to 3, which is consistent with
the specified accuracies of each product
less than 1 5 10
4
–10
5
1* 1–10 6 10
5
–10
6
2* 10–100 7 10
6
–10
7
3 100–1000 8 10
7
–10
8
410
3
–10
4
9 greater than 10
8
:SYNChronization:TINTerval?
RESPONSE FORMAT
Returns the difference or timing shift between the SmartClock 1
PPS and the GPS 1 PPS signals.
±
d.dEe