IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices within
1 millisecond. The IRIG time code formats are serial, width-modulated codes which can be either DC level shifted or ampli-
tude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment may use a GPS
satellite system to obtain the time reference so that devices at different geographic locations can also be synchronized.
(DC SHIFT OR
SIGNAL CAN BE USED)
The IRIG-B repeater provides an amplified DC-shift IRIG-B signal to other equipment. By using one IRIG-B serial connec-
tion, several UR-series relays can be synchronized. The IRIG-B repeater has a bypass function to maintain the time signal
even when a relay in the series is powered down.
GPS SATELLITE SYSTEM
RG58/59 COAXIAL CABLE
TO OTHER DEVICES
Figure 3–20: IRIG-B CONNECTION
Figure 3–21: IRIG-B REPEATER
L90 Line Differential Relay