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Frequency comparator VCH-308A

Frequency comparator VCH-308A is intended for precise measurements of relative frequency and phase difference, calculation of frequency stability and statistical parameters of two identical standard signals.

Key applications
- development, production and tests of frequency and time standards;
- verification of metrological parameters of precision frequency signal soerces;
- time keeping metrology systems;
- 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.
Noise passband: 3 Hz; (10003) Hz, (103) kHz.
Maximal measured relative frequency difference: 1.0×106 (noise passband=10 kHz) and 1.×108 (noise passband=1 kHz; 10 Hz or 3 Hz).
Averaging timer range: from 1 ms up to 86400 s.

Metrological characteristics are given in the table:
Main measurement error
(Frequency instability, inserted by
noises of measurement channels)
Averaging time (τ) Noise
passband
Allan deviation noise
floor
1 ms 1000 Hz ≤3.0×1010
10 ms ≤3.0×1011
100 ms ≤3.0×1012
1 s 3 Hz ≤7.0×1014
10 s ≤1.0×1014
100 s ≤2.0×1015
1000 s ≤5.0×1016
3600 s ≤5.0×1016
1 ms-3600 s 10000 Hz ≤1.0×1011 s/τ


Frequency comparator VCH-308A operates under PC control via the RS-232C or USB interface.
Application software:
- runs under Microsoft Windows 2000, XP, Vista, 7;
- calculates phase changing and frequency difference, two-sample Allan variance, N-sample Allan variance;
- represents results as tables and plots, stores information in files.
Operating temperature range: +5 to +40 .
Power: 220 V, 50 Hz.
Power consumption: ≤30 VA.
Dimensions (W×H×D): 235mm×142mm×326mm.
Weight: 6 kg.
Warranty: 3 years.
Life time: 15 years.

Download manual

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