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BU-65572T Manual
reset to zero each time a new IRIG signal is received (about once per
second). This means that the long term accuracy of the time tags is as
good as the IRIG generator in the system.
7.7.3 IRIG-B Specifications
Rate-scaled serial time code
1st word is time-of-year in BCD notation including days, hours,
minutes, seconds, and fractions of seconds
DDC Usage - Mode B, Not using Straight Binary Seconds
Range = 1 Second to 1 Year
The initial time is 0 days, 0 hours, 0 minutes, 0 seconds on January
1 of the present year
Pulse Code Modulation on 1Khz carrier
One full Time Code is received every second.
Figure 27. Sample IRIG Signal Timing
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