IRIG-B Devices:
The IRIG-B time code provides 1 ms resolution and is widely used by electric utilities and others, especially in the United States.
Some devices which support IRIG-B include:
See also: DCF77, GPS Time Sync
- STR-100/IRIG-B Satellite Time Refer.
- CyTime SER-3200 Event Recorder
- PowerLogic ION8600 meters
- Overcurrent protective relays (various)
See also: DCF77, GPS Time Sync
IRIG-B is used to synchronize power system devices, such as breakers, relays and meters--even across long distances.
The IRIG time codes were developed by the Inter-Range Instrumentation Group (IRIG), part of the Range Commanders Council (RCC) of the US Army.
The standard was first published in 1960 and has been revised several times. The latest version is "IRIG Serial Time Code Formats," IRIG standard 200-04, updated in September, 2004.
For more info...
IRIG time code B (IRIG-B) is widely used in the electrical power industry. IRIG-B has a pulse rate of 100 pulses-per-second with an index count of 10 milliseconds over its one-second time frame. It contains time-of-year and year information in a BCD format, and optionally) seconds-of-day in SBS. Prior to the 2004 revision, year information was not part of the IRIG standard. Instead, IEEE Standard 1344 prescribed a means for encoding the year in unused control bits, known as "IEEE-1344 Extensions."
IRIG-B is typically distributed as a DC level shift, pulse-width coded signal (“unmodulated IRIG-B”) or as an amplitude-modulated signal based on a sine wave carrier with a frequency of 1kHz (“modulated IRIG-B”). The IRIG 200-04 standard does not define specific signal levels or implementation details, but IRIG-B is typically distributed as an unmodulated TTL-level signal over shielded twisted-pair cable.
►View complete IRIG-B Technical Note