Irig-B - GE UR F35 Series Instruction Manual

Multiple feeder protection system

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3.2.10 IRIG-B

IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices. The

IRIG-B code allows time accuracies of up to 100 ns. Using the IRIG-B input, the F35 operates an internal oscillator with 1

µs resolution and accuracy. The IRIG time code formats are serial, width-modulated codes that can be either DC level

shifted or amplitude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment

can use a GPS satellite system to obtain the time reference so that devices at different geographic locations can be syn-

Figure 3–25: OPTIONS FOR THE IRIG-B CONNECTION

Using an amplitude modulated receiver causes errors up to 1 ms in event time-stamping.

F35 Multiple Feeder Protection System