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'''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]]. The work on these standards was started in October of [[1956]], and the original standards
The original formats were described in IRIG Document 104-60, which was later revised and reissued in August [[1970]] as IRIG Document 104-70, leading to an upgrade later that year of the IRIG Document to the status of a Standard, IRIG Standard 200-70. The latest version of the Standard is IRIG Standard 200-95.
The different timecodes defined in the Standard are given alphabetic designations. A, B, D, E, G, and H are the standards currently defined by 200-95. C was in the original specification, but was replaced by H. The main difference between the codes is their rate, which varies between 1 pulse per second and ten thousand pulses per second.
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