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Precision Frequency Comparator VCH-314

Frequency comparator VCH-314 is intended for precise phase and frequency instability measurements. It contains two identical measuring channels (four input signals). Using cross-correlation technique in allows to obtain super-low measurement error and to calculate frequency instability of each single signal separately.

Key Applications
- Verification of metrological parameters of precision frequency signals sources;
- time keeping metrology systems;
- development, production and tests of frequency and time standards;
- scientific research measurements.

Specifications

Input signals: 5 or 10 or 100 MHz nominal frequency, (0.8÷1.2) V into 50 Ω load.
Input impedance: 50 Ω.
Maximal measured relative frequency difference: 1.0106 (noise passband=10 kHz) and 1.0108 (noise passband=3 Hz).
Averaging timer range: from 1 s up to 500000 s.

Metrological characteristics are given in the table:
Main measurement error * (Frequency instability, inserted by noises of measurement channels) Averaging time Noise passband,
Hz
Allan deviation noise floor
One channel
standart mode
Two channel
crosscorrelation mode
1 s 3 8.01014 2.01014
10 s 2.01014 5.01015
100 s 3.01015 1.51015
1000 s 5.01016 5.01016
1 day ≤1.01016
*Specified under condition: ambient temperature changing rate <1 /hour.


Application software
- runs under Microsoft Windows 2000,XP, Vista, 7;
- calculates phase changing and frequency difference for each signals pair, two-samples Allan deviation, N-samples Allan deviation for each signals pair and for each signal separately;
- represents measurement results as tables and plots, stores information in files.
Operating temperature range: +5 to +40 .
Interface: RS-232.
Power supply: AC(198÷242)V, (50÷60)Hz.
Power consumption: ≤30 V⋅A.
Dimensions (W×H×D): 235×140×370 mm.
Weight: 8 kg.
Warranty: 3 years.
Live time:15 years.

Download manual


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