The 910R GPS frequency references are fully traceable and extremely accurate gps frequency standards and are ideally suited for use in many applications, including telecommunications, calibration and automatic test systems.
The 910R deliver a precision frequency and pulse-per-second time reference which, with its many connectivity options, can be installed, monitored and managed from virtually any location. Both models receive their long-term frequency stability from the built-in cesium standards in the GPS-satellite array, yet can also provide a very high short-term stability from the built-in oven controlled crystal oscillator (OCXO) or rubidium oscillator (Rb).
Manufacture Specification
Frequency stability - locked to GPS 910R(GPS-Rb)
Frequency offset (24h mean):<1x10-12*
Short term (Allan dev.):<1 x 10-12(t = 100s)
<3 x 10-12(t = 100s)
<1 x 10-11(t = 10s)
<3 x 10-11(t = 1s)
Warm up (+25C):20 mins to lock
*At temperatures 23C + 3C
Frequency stability Hold-over 910R
(GPS-Rb)
Aging/24h:<2 x 10-12(typ.)
Aging/month:<5 x 10-11
Temp. (0C+50C):<3 x 10-10
Temp. (23C 3C):<2 x 10-11(typ.)
Short term (Allan dev.):<3 x 10-12(t = 100s)
Phase Noise - 910R
OffsetPhase Noise
1 Hz:-80 dBc/Hz (typ.)
10 Hz:-90 dBc/Hz (typ.)
100 Hz:-130 dBc/Hz (typ.)
1 KHz:-140 dBc/Hz (typ.)
10 KHz:-140 dBc/Hz (typ.)
100 KHz:-145 dBc/Hz (typ.)
Reference outputs (BNC)
10 MHz:sine wave, 0.5V rms in 50O
5 MHz:Sine wave, 0.5V rms in 50O
2.048 MHz (opt. 75):+/-1.2V +/-10% in 75 ohms (G.703:10)
1 pps:TTL-levels; low < 0.4V, high > 2V in 50O load
Pulse output (opt. 75):TTL-levels; low < 0.4V, high > 2V in 50O load
Multiple Reference outputs (option 71)
Sine wave outputs:10, 5, 1 and 0.1 MHz >1 Vrms into 50
Pulse output:
0.1 MHz; >3 Vp-p into 50 . 0 V =LO <0.8 V, 3 V
5 additional 13 MHz outputs (option 73)
Impedance:50
Output signal:TTL (symmetrical)
Typical levels into 50n High voltage: 2.35 V
Low voltage: 0 V
Risetime:10 % - 90 %: 2 ns
Jitter:< 0.01 UI
Long term stability:Same as main reference
1-pps output (locked to GPS)
Duty Cycle:Approx. 20%
Jitter:<60 ns rms relative to UTC or GPS (position hold, SA on)
Pulse output
(option 75)
Selectable frequency:1/(N x 10-7) Hz, N is an integer
Factory default setting:1 Hz
Duty cycle:50%
Jitter:<500 ps rms
Ethernet interface
(option 76)
Communication Port:Connector: RJ45
Protocol: 10Base-T
Buffer RAM: 1 kbit
Configuration Port:Connector: Dsub9, RS232
Internal data storage
24h-freq. Offset:2 years data, non-volatile memory
Adjustment data:2 years data, non-volatile memory
Controls
Manual
Hold-over:Inhibits automatic GPS-adjustment and forces hold-over operation. This increases the short-term stability, when the internal Rubidium- or OCXO-reference is free running without any correction from the GPS-monitoring system.
LED Indicators -
Locked to GPS
ON:Disciplined mode
OFF:Hold-over mode
LED Indicators -
Alarm
ON:Alarm condition reported by instrument hardware. Explanatory text in 7-segment display area advises.
OFF:Normal operation
LED Indicators - Manual Hold-over
ON:Forced hold-over mode. If GPS signal is valid, the 24h frequency offset is displayed. Otherwise ----- is shown.
OFF:Automatic choice of disciplined or hold-over mode depending on Locked to GPS status.
GPS-receiver
Antenna connector:Type N
Channels:8, parallel tracking
Carrier, code:L1, C/A
Additional Prep Fees May Apply
