Irig-B - GE B30 Instruction Manual

3 HARDWARE
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 B30 operates an internal oscillator with 1
µs resolution and accuracy. The IRIG time code formats are serial, pulse width-modulated codes that can be either DC
level shifted or amplitude modulated (AM). The GE MultiSync 100 1588 GPS Clock as well as third-party equipment are
available for generating the IRIG-B signal; this equipment can use a global positioning system (GPS) satellite system to
obtain the time reference so that devices at different geographic locations can be synchronized.
Using an amplitude modulated receiver causes errors up to 1 ms in event time-stamping.
The B30 is intended for use with external clocks that set the IRIG-B control bits according to IEEE Std C37.118.1-
NOTE
2011. When used with a source that sets the IRIG-B control bits according to IEEE Std 1344-1995, the source must
have the sign of its local time offset setting reversed, and if daylight savings time (DST) is used, the source's DST
start and DST stop date settings must be interchanged.
GE Multilin
Figure 3–28: OPTIONS FOR THE IRIG-B CONNECTION
B30 Bus Differential System
3.2 WIRING

3.2.10 IRIG-B

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