Chapter 2 Features and Functions
Outputs
Getting Started Guide 2-9
IRIG-B123 is a one-frame-per-second signal indicating the date and
exact time. The output contains both a BCD-coding of day, hour,
minute, second, and a binary coding of accumulated seconds since
midnight. An example is shown in Figure 2-1. The modulated code uses
a 1 kHz carrier.
The sample IRIG-B output shown in Figure 2-1 consists of time-coded
pulses that indicate the time as:
173 days into the year,
21 hours into the day,
18 minutes into the hour, and
42 seconds into the minute.
The sample IRIG-B BCD output in Figure 2-1 also includes a Straight
Binary portion, which consists of time-coded pulses that indicate the
time of day as 76,722 seconds into the day, which is the total you would
get if you summed up 21 hours, 18 minutes, and 42 seconds.
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