
ManufacturerVremyaCH67, Osharskaya Str., 603105, Nizhny Novgorod, Russiavremyach@madeinzelenograd.com

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Frequency comparator VCH308AFrequency comparator VCH308A is intended for precise measuring of frequency and time standards signal instability. The comparator contains built in time interval counter and an interface RS232C. 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  10^{5} s. Passband: 10000Hz, 1000Hz, 10Hz, 3Hz.
Additional error at df/f: < 2x10^{3} df/f. 1 PPS output to the external time interval counter (TTL levels on 50Ohm load). Application software (Microsoft Windows 9x,2000,XP):  Calculates phase and frequency difference of input signals, 2samples Allan variance, Nsamples 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. GPS/GLONASS Disciplined Rb Oscillator VCH311GPS/GLONASS disciplined rubidium frequency standard model VCH311 is a high stable frequency signal source (STANDARD mode), or precision frequency calibrator for any external standard signals (CALIBRATOR mode). The instrument contains multichannel GPS/GLONASS receiver, time scale comparison unit and automatically adjustable Rubidium reference oscillator. Frequency error (STANDARD mode) is less than ± 3x10^{12} in 24 hours of continuous work. Periodicity of correction of the builtin rubidium reference generator is 3 hours. Output signals:  10MHz, 5 MHz sine, 1V rms on 50 Ohm load;  2.048 MHz, pulse, (ITUT G.703 / 10);  1 PPS (TTL)  satellite time scale. Frequency instability of output signals 10 and 5 MHz (STANDARD mode) is less than 7x10^{12} in 10 seconds and 2x10^{12} in 24 hours. Output signals frequency accuracy depending on time expired from start up in STANDARD mode:  ±2x10^{11} – after 3 hours;  ±7x10^{12} – after 9 hours;  ±3x10^{12} – after 24 hours and longer. Input signals from external frequency standard in CALIBRATOR mode: 10, 5 or 2.048 MHz with the amplitude 0,7 – 3,5 V on 75 Ohm load. Frequency calibration accuracy (RMS value) is less than 1x10^{12} in 24 hours and 1x10^{13} in 10 days. The results of the measurement in relative units are represented on the indicator panel of the equipment. Power: AC 220 V; 50 – 60 Hz, or DC – 48±10 V (have to be determined in purchase order). Power consumption: 25W in normal conditions (warm up time 85W, 1 hour). Dimensions: 483x140x330 mm. Weight: less than 10 kg. Antenna dimensions not more 185xø181 mm. Antenna weight: 0,5 kg. The leadin cable's length is 60 m. Frequency Calibrator VCH313Frequency calibrator VCH313 is intended for calibration and verification of different types of frequency standards, using precision signal, transmitted by satellite navigation systems GPS/GLONASS. The device can also perform periodical frequency correction of a calibrated frequency standard in special automatic mode.
Input signals from the external frequency standard: 1 MHz – 20 MHz with the amplitude 0,7 – 3,5 V on 75 Ohms load. Input signal frequency is to be set by the user manually with the step 0,001 MHz. Frequency calibration error of an input signal (frequency calibrator mode) depends on measurement time. Minimal frequency calibration error for measurement time more than 10 days, is 1x10^{13}. Calibrator forms the signal for an external standard frequency correction in digital or analog form. Adjustment slope is to be determined by user. Power: AC 220V; 50 – 60 Hz, or DC 48 ± 10V (depends on order). Power consumption <15W. Start up time <15 min. Dimensions (without antenna and a cable): 340x235x140mm. Weight: <3,5 kg. Precision Frequency Comparator VCH314Frequency comparator VCH314 is intended for precise phase and frequency instability measuring. It contains two identical measuring channels (three input signals). Using crosscorrelation technique allows to obtain superlow 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  10^{5} s.
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, 2samples Allan variance, Nsamples Allan variance for each signals pair and for each signal separately;  represents results as tables and plots, stores information in files. Interface: RS232C. Power: 220 V; 5060 Hz; < 30 VA. Dimensions: 254x133x311 mm. Weight: < 8 kg. Multichannel frequency Comparator VCH315The frequency comparator VCH315 is a multichannel system for precise signals instability measuring. The device is controlled by PC through RS232C or LAN interface. Input signals: sinusoidal 5 MHz, 10 MHz, 100 MHz; 0,8 – 1,2 V rms; pulse 1 Hz (as option). Number of channels: 8. Input impedance: 50 Ohm. Maximal input relative frequency difference: df/f = ±0,5x10^{9}. Passband: (10 ± 3) Hz. Measuring time: t = 1  10^{6} s. Frequency difference measurement resolution: 10^{–14}/t.
Additional error at df/f: <0.002df/f. Application software:
Power: 220 V, 50  60 Hz. Power consumption: < 40 BA. Dimensions: 145x450x315 mm. Weight: 7 kg. Send enquiry 