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Precision Frequency Comparator

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Frequency comparator VCH-314 is intended for precise phase and frequency instability measuring. It contains two identical measuring channels (three input signals). Using cross-correlation technique allows to obtain super-low measurement error and to calculate frequency instability of each single signal separately.
Input signals: 5 MHz; 10 MHz; 100 MHz (0,8 – 1,2V rms on 50 Ohm load).
Maximal frequency difference: (df/f) = ±1x10–6.
Measuring time: 1 - 105 s.
Measurement error (inserted frequency instability):
Measuring
Time

Main error (df/f=0, passband 3 Hz) not more than
One channel mode

Two channels mode
1 s

<8x10–14

<2x10–14
10 s

<2x10–14

<5x10–15
100 s

<3x10–15

<1.5x10–15
>1000 s

<5x10–16

<5x10–16
Additional error at df/f: <2x10–3 (df/f).
Application software (Microsoft Windows 9x,2000,XP):
- calculates phase changing and frequency difference for each signals pair, 2-samples Allan variance, N-samples Allan variance for each signals pair and for each signal separately;
- represents results as tables and plots, stores information in files.
Interface: RS-232C.
Power: 220 V; 50-60 Hz; < 30 VA.
Dimensions: 254x133x311 mm.
Weight: < 8 kg.

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