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.
Manual for VCH-314
– Hardware Operational Manual
download
– VCH-314 Routine for Multi-Channel Measurement of Frequency Instability
download
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:
±1.0·10
–6
(noise passband=10 kHz) and ±1.0·10
–8
(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, s | Noise passband, Hz | Allan deviation noise floor | |
|---|---|---|---|---|
| One channel standart mode | Two channel crosscorrelation mode | |||
| 1 s | 3 | 8.0·10 –14 | 2.0·10 –14 | |
| 10 s | 2.0·10 –14 | 5.0·10 –15 | ||
| 100 s | 3.0·10 –15 | 1.5·10 –15 | ||
| 1000 s | 5.0·10 –16 | 5.0·10 –16 | ||
| 1 day | ≤1.0·10 –16 | |||
| *Specified under condition: ambient temperature changing rate <1 °С/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 °С to +40 °С.
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.
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