29 910/910R GPS Frequency Standards
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GPS Frequency Standards
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The 910 and 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.
Both the 910 and 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).
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- -20 °C to +150 °C temperature measurement range
- Six color palettes
- Can withstand drop up to 1 meter
- IP 54 enclosure rating
Specifications: 910/910R GPS Frequency Standards
| Disciplined Mode: | The frequency deviation between the internal timebase oscillator and the received GPS-signal is used to continuously adjust the oscillator (disciplining). The resulting frequency offset and adjustment data is stored in non-volatile memory every 24h, to enable printout of the traceability record. The actual frequency offset (24h mean value) is calculated and displayed on the front panel. |
| Hold-over Mode: | The internal oscillator is not adjusted. This mode is normally automatically entered when there is no usable received GPS-signal. This mode can also be selected manually be activating the Manual hold-over key. If Manual hold-over is set together with a valid received GPS signal, the actual frequency offset is calculated and displayed plus stored in non-volatile memory every 24h. |
Frequency stability – locked to GPS 910R (GPS-Rb)
| Frequency offset (24h mean): | <1×10-12* |
| 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 (+25°C): | 20 mins to lock |
| *At temperatures 23°C + 3°C | |
Frequency stability – locked to GPS 910 (GPS-OCXO)
| Frequency offset (24h mean): | <1×10-12* |
| 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 (+25°C): | 20 mins to lock |
| *At temperatures 23°C + 3°C | |
Frequency stability – Hold-over 910R
(GPS-Rb)
| Aging/24h: | <2 x 10-12 (typ.) |
| Aging/month: | <5 x 10-11 |
| Temp. (0°C…+50°C): | <3 x 10-10 |
| Temp. (23°C ± 3°C): | <2 x 10-11 (typ.) |
| Short term (Allan dev.): | <3 x 10-12 (t = 100s) |
Frequency stability – Hold-over 910
(GPS-OCXO)
| Aging/24h: | <3 x 10-10 |
| Aging/month: | <3 x 10-9 |
| Temp. (0°C…+50°C): | <2.5 x 10-9 |
| Temp. (23°C ± 3°C): | <4 x 10-10 (typ.) |
| Short term (Allan dev.): | <1 x 10-11 (t = 100s) |
| <5 x 10-12 ( t = 10s) | |
| <5 x 10-12 (t = 1s) | |
| Warm up (+ 25°C): | 10 minutes to 5 x 10-9 |
Phase Noise – 910R
| Offset | Phase 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.) |
Phase Noise – 910
| Offset | Phase Noise |
| 1 Hz | -100 dBc/Hz (typ.) |
| 10 Hz | -120 dBc/Hz (typ.) |
| 100 Hz | -130 dBc/Hz (typ.) |
| 1 KHz | -135 dBc/Hz (typ.) |
| 10 KHz | -135 dBc/Hz (typ.) |
| 100 KHz | -135 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 |
5 additional 10 MHz outputs (option 70)
| See specification for 10 MHz above |
Multiple Reference outputs (option 71)
| Sine wave outputs: | 10, 5, 1 and 0.1 MHz >1 Vrms into 50 Ω |
| Pulse output: | 0.1 MHz; >3 Vp-p into 50 Ω. 0 V =LO <0.8 V, 3 V |
10 MHz and 5 MHz & 2.048 MHz (opt 72) outputs
| Freq. Stability: | See frequency stability specs for 910 and 910R |
5 additional 13 MHz outputs (option 73)
| Impedance: | 50 Ω |
| Output signal: | TTL (symmetrical) |
| Typical levels into 50ƒn Ω | 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)
910/910R GPS Frequency Standards
Includes:
| Model Name | Description | |
|---|---|---|
| 910 | GPS Controlled OCXO Frequency Standard 5 x 10 MHz and 1 x 5 MHz outputs All models include:
| |
| 910R | GPS-Controlled Rubidium Frequency Standard. 5 x 10 MHz and 1 x 5 MHz outputs |
910/910R GPS Frequency Standards
Includes:
| Accessory | Description |
|---|---|
| 910-01 | GPS Antenna |
| 910-01/50 | GPS Antenna Mounting Kit |
| 910-50 | Rack-Mount Kit |
| 910-60 | Carrying Case |
| 910-70 | 5 additional 10 MHz outputs |
| 910-71 | Multiple reference outputs – 0.1 MHz, 1 MHz, 5 MHz and 10 MHz sinewave outputs, plus a 0.1 MHz squarewave output. |
| 910-75 | 1 additional pulse output 0.5 Hz… 5 MHz |
| 910-76 | Ethernet interface |
| 910R-01 | GPS Antenna |
| 910R-01/50 | GPS Antenna Mounting Kit |
| 910R-02/20 | Antenna Cable, 20 m |
| 910R-02/50 | Antenna Cable, 50 m |
| 910R-50 | Rack-Mount Kit |
| 910R-60 | Carrying Case |
| 910R-70 | 5 additional 10 MHz outputs |
| 910R-71 | Multiple reference outputs – 0.1 MHz, 1 MHz, 5 MHz and 10 MHz sinewave outputs, plus a 0.1 MHz squarewave output |
| 910R-75 | 1 additional pulse output 0.5 Hz… 5 MHz |
| 910R-76 | Ethernet interface |
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