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3-169 KEYPAD FUNCTION 69 - SELECT LOCAL/STANDARD/GPS/UTC TIME
Use Function 69 to select between LOCAL, STANDARD, GPS or UTC time. The selected time type
will be displayed and sent out on the IRIG B and Serial Ports. The as-shipped default is the UTC time
format. The value on power-up will be that in use prior to power-down.
Description of the various time types:
GPS:
The time determined by primary atomic frequency standards. This type of time
does not include leap seconds. Therefore, it differs from UTC time, which
includes leap seconds added to UTC since 1/6/80.
UTC:
Universal Time Coordinated. This time is related to the local solar mean time at
Greenwich Meridian. This time is adjusted once in a while to compensate for
earth’s rotational variations. UTC time is available in 24 hour format only.
STANDARD: This time equals UTC plus the local time zone offset.
LOCAL:
This time equal STANDARD plus Daylight Saving Time offset, when required.
Standard and Local times require the proper setting of the time zone offset (Function 01). In addition,
Local time requires that Daylight Saving Time be properly set (Function 66), if applicable. The
12/24 hour mode (Function 02) will only affect GPS, Standard, and Local times.
Press “FUNC/ENTR”, then “6” “9”. The display will show:
Select Time Type
<Time Type>
where <Time Type> is either LOCAL, STANDARD, GPS or UTC.
Press the up or down arrow keys to toggle between LOCAL, STANDARD, GPS and UTC. When the
display shows the desired format, press “FUNC/ENTR” to enter your choice.
3-170 reserved
3-171 KEYPAD FUNCTION 71 - OSCILLATOR STATISTICS REQUEST
Use Keypad Function 71 to request the internal or external (when operating in the optional External
Oscillator enabled mode, see Function 07) oscillator's phase, frequency offset, drift rate and DAC
value. The phase is the instantaneous error in seconds between the oscillator and the control loop zero
servo point as reported by the core GPS module. The frequency offset is computed using an averaging
time that is equal to the effective averaging time of the oscillator controller. The oscillator drift rate is
computed using a 24 hour average and is the daily drift rate of the oscillator. The oscillator DAC value
is the signed 16 bit integer which controls the DAC output voltage. It ranges from 32767 to -32768.
Summary of Contents for 151-600
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