Meinberg GPS170PEX, Руководство пользователя

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11.1 Assignment of the 5 pin contact strip Page 23
ACCURACY OF FREQUENCY AND PULSE OUTPUTS:
Oscillator Op�on TCXO (standard) OCXO LQ (op�on)
short term stability (τ = 1 sec) 2 * 10 -9 1 * 10 -9
accuracy of PPS
(pulse per second)
< +/- 250 nsec < +/- 250 nsec
phase noise
1 Hz -60 dBc/Hz
10 Hz -90 dBc/Hz
100 Hz -120 dBc/Hz
1 kHz
-130 dBc/Hz
1 Hz -60 dBc/Hz
10 Hz -90 dBc/Hz
100 Hz -120 dBc/Hz
1 kHz
-130 dBc/Hz
accuracy free run, one day
+/- 1 * 10 -7
+/- 1 Hz (Note 1) +/- 2 * 10 -8
+/- 0,2 Hz (Note 1)
accuracy free run, one year
+/- 1 * 10 -6
+/- 10 Hz (Note 1) +/- 4 * 10 -7
+/- 4 Hz (Note 1)
accuracy GPS-synchronous
averaged 24 h
+/- 1 * 10 -11 +/- 1 * 10 -11
accuracy of �me free run,
one day
+/- 8,6 msec +/- 1,8 msec
accuracy of �me free run,
one year
+/- 32 sec +/- 13 sec
temperature dependant dri�,
free run +/- 1 * 10 -6
(-20...70°C) +/- 2 * 10 -7
(0...60°C)
Note 1:
The accuracy in Hertz is based on the standard frequency of 10 MHz. For example:
Accuracy of TCXO (free run one day) is +/- 1 * 10 E
-7
* 10 MHz = +/- 1 Hz
The given values for the accuracy of frequency and �me (not short term accuracy)
are only valid for a constant ambient temperature ! A minimum �me of 24h of
GPS-synchronicity is required before free run starts.
11.1 Assignment of the 5 pin contact strip
The contact strip can be used to access the 10 MHz frequency output and the serial port COM1. Pin 5 is located
near the board's bus connector:
Pin Signal
1 10 MHz out
2 GND
3 RxD1 in
4 TxD1 out
5 GND
GPS170PEX Date: 2009-06-24 23