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TYPICAL WIRING
3.2.17 IRIG-B
3.2.18 Dielectric Strength
3–20
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 amplitude 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.
GPS CONNECTION
OPTIONAL
IRIG-B
TIME CODE
GENERATOR
(DC SHIFT OR
AMPLITUDE MODULATED
SIGNAL CAN BE USED)
Dielectric strength test was performed on the 745 relay at the manufacturer. It is not
necessary to perform this test again at the customer site. However, if you wish to perform
this test, follow instructions outlined in Dielectric Strength Testing on page 7–6.
FIGURE 3–19: RS232 Wiring
GPS SATELLITE SYSTEM
RG58/59 COAXIAL CABLE
+
–
TO OTHER DEVICES
FIGURE 3–20: IRIG-B function
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION
745 RELAY
B8
IRIG-B(+)
RECEIVER
B9
IRIG-B(–)
814823A1.CDR
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