USERS MANUAL
NR300
REVISION
D
DATE
8/16/21
Page #:
24 of 48
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Frequency
Identifier
Values
Description
FREQUENCY
Hz
Source frequency as measured relative to GNSS locked
PPS. If the GNSS is not locked, the value will not appear,
and the flashing Rb holdover indicator will appear.
ERROR
ppb
Calculation of frequency error in ppb relative to the
GNSS PPS. If the GNSS is not locked, the value will not
appear.
GATE
s
The sample period of the frequency counter, which
expands up to 50 seconds as valid data is acquired.
PPSRB
ns
Difference between the GNSS PPS and Rb PPS as
reported by the Rb module.
ACCY
ns/ns
<estimate/threshold>
Estimate of current PPS accuracy provided by the
GNSS receiver vs the current accuracy threshold needed
to produce discipline and monitoring. High values
(greater than the threshold) indicate the unit or the
antenna should be moved to a better view of the sky.
PPSRF
ns
Difference between the GNSS PPS and Rb PPS