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Installation __________________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
3-9
IRIG-B is unidirectional with signals sent by the master to the slave devices to maintain a uniform
system time.
Find the settings for the IRIG-B in HPS/RFL GARD Pro system with and without the GPS in
section
3.5.6 The 1
– Pulse per second timing connection
The 1-Pulse per Second signal provides a timing pulse each second. The shape of the pulse makes
the signal more precise than one second and can be a few microseconds or better. The internal
clock provides the timings less than a second with the 1-PPS signal providing system accuracy.
The length of the transmission line and the resulting pulse distortion can affect the accuracy of a
signal.
3.5.7 GPS antenna connection (optional)
The optional GPS antenna takes the system timing from the GPS satellites.
When the GPS option is installed, the BNC connectors labeled “IRIG-B’ and “1PPS” function as
outputs and can be used to drive equipment external to the HPS/RFL GARD Pro system. In this
case the IRIG-B output is un-modulated.