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Frequency Comparator

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Frequency comparator VCH-308A is intended for precise measuring of frequency and time standards signal instability. The comparator contains built in time interval counter and an interface RS-232C.
Input signals: 1 Hz, 5 MHz, 10 MHz, 100 MHz (0,6 – 1,2V rms).
Maximal input relative frequency difference: (df/f) = ±1x10–6.
Measuring time: t = 1 ms - 105 s.
Passband: 10000Hz, 1000Hz, 10Hz, 3Hz.
Measurement error (frequency instability introduced by the device):
Measuring time t

Main error
(RMS @ df/f=0)
not more
1-100 ms

<3x10–13/t (P = 1000 Hz)
1 s

<7x10–14 (P = 3 Hz)
10 s

<1x10–14 (P = 3 Hz)
100 s

<2x10–15 (P = 3 Hz)
>1000 s

<5x10–16 (P = 3 Hz)
Additional error at df/f: < 2x10-3 df/f.
1 PPS output to the external time interval counter (TTL levels on 50-Ohm load).
Application software (Microsoft Windows 9x,2000,XP):
- Calculates phase and frequency difference of input signals, 2-samples Allan variance, N-samples Allan variance, frequency fluctuations spectra.
- Represents results as tables and plots, stores information in files.
Power: 220 V; 50 - 60 Hz; < 40 VA.
Dimensions: 254x133x311 mm.
Weight: not more 6 kg.

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