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Real-Time Atomic Clock Combiner VCH-317

Real-Time Atomic Clock Combiner (Combiner) produces an uninterrupted in frequency and phase signal on the base of group atomic clocks. Operational principle of Combiner is based on frequency control of local crystal oscillator using multichannel phase comparator and digital processor.Digital control of output frequency performed by built-in processor provides such advantages as programming frequency and phase shifts of output signal with high resolution.

Key Applications
- time and frequency redundant systems;
- frequency and time keeping etalons.

Specifications

Input signals:
- sine: 5 or 10 or 100 MHz nominal frequency, (0.8÷1.2) V into 50 Ω load;
- maximal frequency deviation from nominal value: 1.0x1011;
- number of input signals: up to 4.

Output signals:
- sine: 5; 10; 100 MHz, (0.9÷1.1) V into 50 Ω load, harmonics ≤-30 dB;
- pulse: 1 Hz (1 pps time scale), positive polarity, amplitude (2.5÷5.0) V into 50 Ω load, pulse width (10.240.1) s; rise time: ≤20 ns.

Metrological characteristics are given in the table:
Frequency instability, inserted by internal
phase noises (frequency differences between any
input or output signals ≤1x1012)
Averaging time (τ) Allan deviation noise floor
1 s ≤2.0×1013
3600 s ≤1.5×1015
Output signal phase noise
(5 MHz output)
Frequency offset Spectral density
10 Hz −120 dBc/Hz
100 Hz −120 dBc/Hz
1000 Hz −150 dBc/Hz
10000 Hz −153 dBc/Hz
Programmable output signals frequency shift resolution
range
1×1018
1×108
Programmable output signals frequency drift
compensation
resolution
range
1×1018
8.64×1012
Programmable output signals phase shift resolution
range
1012 s
999999x1012 s


The Combiner automatically excludes from combination process any input signal when the signal: disappears; exceeds the given frequency difference limit; external ERROR signal from the input signal source is coming. In such a case of failure the combiner holds output signal frequency and phase: (frequency shift (RMS) ≤2.0×1015; phase shift ≤1.0×1010 s). After the signal renewal the previous combination can be recovered by operator only.
Application software: runs under Microsoft Windows XP, Vista 7. Full data monitoring and functions control are performed manually by front panel or remotely through interface.
Interface: RS-232C or USB.
Power: AC (198÷242) V, (50÷60) Hz; DC (22÷32) V. Power consumption ≤60 VxA.
Dimensions (W×H×D): 483mm×133mm×370mm.
Weight: 8 kg.
Warranty: 3 years.
Life time: 15 years.

Download manual


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