| General Specifications |
| Operating Modes |
| 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): |
<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 (+25°C): |
20 mins to lock |
| *At temperatures 23°C + 3°C |
|
| Frequency stability - locked to GPS 910 (GPS-OCXO) |
| 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 (+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 |
|
| Phone 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.) |
|
| Phone 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) |
| Duty Cycle: |
Approx. 20% |
| Jitter: |
<60 ns rms relative to UTC or GPS (position hold, SA on) |
|
Pulse output
(option 75) |
| The frequency is set via the included PC-program |
| Selectable frequency: |
1/(N x 10-7) Hz, N is an integer |
| Factory default setting: |
1 Hz |
| Duty cycle: |
50% |
| Jitter: |
<500 ps rms |
| Freq. Stability: |
See frequency stability specs for 910 and 910R |
|
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 |
|
| Antenna (option 01) |
| Type: |
active L1 |
| Operating temp.: |
-40°C to +70°C |
| Height: |
81 mm (3.2") (excl. connector) |
| Weight: |
>30 dB |
| Gain: |
TNC |
|
Antenna cable
(option 02) |
| Type: |
RG213 |
| Length: |
20 m |
| Connectors: |
N-type and TNC (male) |
| Cable delay: |
101 ns. |
| Attenuation: |
Approx. 8 dB at 1.6 GHz |
|
| PC-connection |
| Interface: |
RS-232, DTE |
| Connector: |
9-pin male DB9, Rx on pin 2, Tx on pin 3, GND on pin 5 |
| Baud rate: |
9600 bps |
| Data structure: |
8 data bits 1 stop bit, no parity |
|
| Fan |
|
| Environmental |
| Temperature: |
0°C...+50°C (operating) |
| |
-40°C...+70°C (storage) |
| Safety: |
Compliant to CE: EN 61010-1 + A1 (1992) + A2 (1995) |
| EMI: |
Compliant to CE: EN 1326-1 (1997) |
|
| Power consumption |
| Line voltage: |
100...240 V (±10%) |
| Line frequency: |
47..63 Hz |
| Power 910R: |
<75 W at warm-up <35 W continuous operation |
| Power 910: |
<25 W at warm-up <12 W continuous operation |
|
| Calibration Documentation |
Statement of calibration practices |
| Size |
| WxHxD: |
315 x 86 x 395 mm |
| |
12.4" x 3.4" x 15.6" |
|
| Weight |
| 910R |
4.4 kg net, 7.4 kg shipping (9.7 lb net, 16.3 lb shipping) |
| 910 |
3.9 kg net, 6.9 kg shipping (8.6 lb net, 15.2 lb shipping) |
|
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