NTP100 – Rev 1.0.1 Dec-04
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© Masterclock
®
, Inc.
Problem: NTP client indicates that the NTP100 is providing invalid time, or has flagged time as invalid.
The NTP100 will always answer NTP requests, but will flag time as invalid if it does not have trusted time to distribute. This
may occur temporarily during GPS navigation state changes, or before the first GPS acquisition after the NTP100 has been
powered on after being off for an extended period of time.
By default, the NTP100 will begin flagging time invalid after 24 hours of consecutive GPS acquisition failure or non-
operation (powered off). This is a protective feature, and can be adjusted or disabled if desired – see device configuration
sections.
Problem: You have lost your password
The password cannot be recovered if it is lost. Reset the NTP100 to factory default configuration using the procedure
described in the Configuration section.
Problem: The UTC date/time is incorrect and the unit does not retain configuration settings when powered up.
The NTP100 maintains its internal configuration and settings in battery backed memory located on the RTC chip. The
battery supplies power to the TCXO 32kHz Oscillator and RTC when the unit is powered off. This allows the internal
configuration to be maintained and the time and date to increment, when power is off. Under normal operating condition, the
memory devices maintaining the RTC data and configuration settings is powered by the external DC power supply and does
not rely on the battery for data retention.
Note: If the NTP100 does not retain its configuration, or its Date/Time settings (often indicated by the front panel time
display counting up from ‘zero’) the battery will likely need replacement.
Check and replace the battery, if necessary. The battery type is a ‘replaceable’ 3V lithium coin cell battery and can be
replaced by a qualified technician, or the unit can be sent to technical support at Masterclock for repair/replacement for
service using our RMA procedure. The battery size/type vary for the various models. See the “Specifications” section for
details on the recommended battery replacement, or contact technical support for assistance.
Time Code Decoding Issues
The following items are specific to the NTP100-TC model.
The easiest way to verify that the NTP100-TC is decoding time code is to observe the status of the LED on the front panel
and with the WinDiscovery “Status”. The green LED will be flashing at 1 pulse per second when the NTP100-TC is
properly decoding time code. If the LED is not lit, or is not flashing at 1 pulse per second (1 Hz), then there is a problem
with the time code signal.
Time code decoding problems can include any of the following:
•
no time code present
•
ground loops or other interference
•
bad/intermittent cables, wiring, or connectors
•
a signal level that is out of range (too high or too low)
•
a signal level that is fluctuating
•
a time code type that the NTP100-TC does not support
Before concluding that there is a physical problem with time code decoding on the NTP100-TC, please rule out all of the
above possibilities.
