GPS/GLONASS disciplined rubidium frequency standard model VCH-311 contains multi-channel GPS/GLONASS receiver, time scale comparison unit and automatically adjustable Rubidium reference oscillator. The instrument is intended to use as a high stable frequency signal source (STANDARD mode), or precision frequency calibrator for any external standard signals (CALIBRATOR mode).
Key Applications
– Verification of metrological parameters of precision frequency signals sources;
– time keeping metrology systems;
– scientific research measurements.
Specifications
Output signals:
– Sine: 5 and 10 MHz, sine, 1 V into 50 Ω load;
– 2,048 MHz, pulse, (ITU-T G.703);
– 1 Hz, pulse, TTL levels into 50 Ω load, (1 pps GPS/GLONASS receiver output).
Input signals serviceable for frequency calibration:
– 5 or 10 MHz, sine, 1 V into 50 Ω load;
– 2,048 MHz, pulse, (ITU-T G.703).
Metrological characteristics are given in the table:
| Relative frequency accuracy in STANDARD mode | ≤±3·10 −12 | |
|---|---|---|
| Time accuracy from UTC/UTC SU, (RMS) | ≤100 ns | |
| Relative accuracy versus warm up time | 3 h | ≤±2.0·10 −11 |
| 9 h | ≤±7.0·10 −12 | |
| 24 h | ≤±3.0·10 −12 | |
| Allan deviation of output signal 10 MHz for average time τ | τ=1 s | ≤1.5·10 −11 |
| τ=1 day | ≤2.0·10 −12 | |
| Frequency calibration error in the CALIBRATOR mode for average time τ and measuring time | τ=100 s; T=10 5 s | ≤1.0·10 −12 |
| τ=1000 s; T=10 6 s | ≤1.0·10 −13 | |
Digital control and monitoring
all operating parameters on LSD display.
Interface:
RS-232C; USB.
Power supply:
AC(198÷242)V, (50÷60)Hz; DC(38.4÷57.6)V.
Power consumption:
45 W in normal conditions (85 W warm up time 1 hour).
Dimensions (W×H×D):
483×133×310 mm.
Antenna:
dimensions 185x∅181 mm. Weight 0,5 kg. Antenna cable’s lenght is 60 m.
Weight:
10 kg.
Warranty:
3 years.
Live time:
15 years.
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