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Line 1: '''Inter-range instrumentation group time codes''', commonly known as '''IRIG timecodes''', were created by the TeleCommunications Working Group of the [[IRIG\|Inter-Range Instrumentation Group]], the standards body of the [[Range Commanders Council]]. Work on these standards started in October 1956, and the original standards were accepted in 1960. The original formats were described in IRIG Document 104-60, later revised and reissued in August [[1970]] as IRIG Document 104-70, upgraded later that year as the IRIG Document to the status of a Standard, IRIG Standard 200-70. The latest version of the Standard is IRIG Standard 200-04. The different timecodes defined in the Standard have alphabetic designations. A, B, D, E, G, and H are the standards currently defined by 200-04. C was in the original specification, but was replaced by H. The main difference between codes is their rate, which varies between one pulse per minute and 10,000 pulses per second.

IRIG timecode: Difference between revisions