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Components and Specifications
INFORMA PMD-A can be configured to generate an internal PPH signal by counting the
50/60 Hz line frequency signal from a configured FR Frequency reference voltage channel.
Internal PPH signal should only be used when the line frequency has a tolerance of
0.06%. This would typically be used to eliminate a long-term drift in the internal
RTC time when an external time reference is not available.
If the frequency in the selected voltage channel is beyond 0.06% tolerance, the
device will experience frequent "Abrupt Time Shifts".
If the amplitude in the selected voltage channel is below 10% of nominal voltage,
the device will experience frequent "Abrupt Time Shifts".
External PPH signal is validated only if it is within ±5 minutes of an hour boundary
as determined by RTC time. If the PPH signal is received beyond this ±5-minute
time window, it is rejected and no actions are performed. Therefore, a user must
initially set the time on the INFORMA PMD-A device to an accuracy of 5 minutes
while using the external PPH.
External PPM signal is validated only if it is within ±10 seconds of a minute
boundary as determined by RTC time. If the PPM signal is received beyond this
±10-second time window, it is rejected and no actions are performed. Therefore, a
user must initially set the time on the INFORMA PMD-A device to an accuracy of
10 seconds while using the external PPM.
INFORMA PMD-A can be configured as the time master using iQ+, as shown in the
following figure. Refer to iQ+ help for additional information.
Figure 3.28 - Time Management
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