COM0:
19200, 8N1
Meinberg Standard time string, per second
COM1:
9600, 8N1
Capture string, automatically
TIME CODE OUTPUTS:
Unbalanced modulated sine wave signal:
3V
pp
(MARK), 1V
pp
(SPACE) into 50 ohm
DCLS-signal: TTL into 50 ohm, active-high or -low, selected by jumper
optionally optical output(instead of modulated sine wave):
optical power:
typ. 15
µ
W
optical connector:
ST-connector
for GI 50/125
µ
m
or GI 62,5/125
µ
m
gradient fiber
POWER
REQUIREMENT:
+3.3 V:
257 mA
+12 V:
230 mA
power supplies provided by PCI Express interface
PHYSICAL
DIMENSION:
low profile expansion board (69 x 150 mm)
RF CONNECTOR:
female coaxial BNC-connectors for antenna and modulated time code
AMBIENT
TEMPERATURE:
0 ... 50
◦
C
HUMIDITY:
85% max.
ACCURACY OF FREQUENCY AND PULSE OUTPUTS:
Oscillator Option
TCXO (standard)
OCXO LQ
OCXO MQ
OCXO HQ
short term stability (τ = 1 sec)
2E-9
1E-9
2E-10
5E-12
accuracy of PPS
(pulse per second)
< +/- 100 nsec
< +/- 100 nsec
< +/- 50 ns
< +/- 50 ns
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
1Hz -75dBc/Hz
10Hz -110dBc/Hz
100Hz -130dBc/Hz
1kHz -140dBc/Hz
1Hz < -85dBc/Hz
10Hz < -115dBc/Hz
100Hz < -130dBc/Hz
1kHz < -140dBc/Hz
accuracy free run, one day
+/- 1E-7
+/- 1 Hz (Note 1)
+/- 2E-8
+/- 0,2 Hz (Note 1)
+/- 1,5E-9
+/- 15mHz (Note1)
+/- 5E-10
+/- 5mHz (Note1)
accuracy free run, one year
+/- 1E-6
+/- 10 Hz (Note 1)
+/- 4E-7
+/- 4 Hz (Note 1)
+/- 1E-7
+/- 1Hz (Note1)
+/- 5E-8
+/- 0.5Hz (Note1)
accuracy GPS-synchronous
averaged 24 h
+/- 1E-11
+/- 1E-11
+/- 5E-12
+/- 1E-12
accuracy of time free run,
one day
+/- 4.3 msec
+/- 865 µs
+/- 65 µs
+/- 22 µs
accuracy of time free run,
one year
+/- 16 sec
+/- 6.3 sec
+/- 1.6 s
+/- 788 ms
temperature dependant drift,
free run
+/- 1E-6
(-20...70°C)
+/- 2 * 10 -7
(0...60°C)
+/- 5E-8
(-20...70°C)
+/- 1E-8
(5...70°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 +/- 1E-7
*
10 MHz = +/- 1 Hz
The given values for the accuracy of frequency and time (not short term accuracy) are only valid for a constant
ambient temperature ! A minimum time of 24h of GPS-synchronicity is required before free run starts.
20
Date: 28th March 2018
GPS180PEX