Ashida ADR233B - Page 188

Doc ID : ADR233B/IM/01
Ref ID : ADR233B/IM/CS
Rev No. : 05
Page No. : 188 of 479
ADR233B
7.1 IRIG TIME CODE DESIGNATIONS
The letter B006 is used to designate one of the six IRIG code formats. Signal identification
numbers are used to further describe specific characteristics. Thus, the complete IRIG time
code designation consists of a letter and three digits as shown below.
IRIG-B Overview
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. IRIG-B Signals IRIG-B is typically distributed as a DC level shift (DCLS), pulse-
width coded signal (“unmodulated IRIG-B”) in ADR series of Ashida.
1
st
Digit Modulation
0 Unmodulated, DC Level Shift (DCLS), pulse-width coded
1 Amplitude modulated, sine wave carrier
2 Manchester modulated
2
nd
Digit Carrier Frequency / Resolution
0 No carrier (DCLS)
1 100 Hz / 10 ms resolution
2 1 kHz / 1 ms resolution
3 10 kHz / 100 microsecond resolution
4 100 kHz / 10 microsecond resolution
3
rd
Digit Coded Expressions
0 BCDTOY, CF, SBS
1 BCDTOY, CF
2 BCDTOY
3 BCDTOY, SBS
4 BCDTOY, BCDYEAR, CF, SBS
5 BCDTOY, BCDYEAR, CF
6 BCDTOY, BCDYEAR
7 BCDTOY, BCDYEAR, SBS