Multichannel Frequency Comparator VCH-315M Multichannel frequency comparator VCH-315M is intended for precise phase and frequency instability measurements. It contains 8 identical measuring channels and performs synchronous high precision phase and frequency comparison of 5, 10 and 100 MHz signals, which allows using cross-correlation methods for instability estimation. Each channel includes two inputs for measured signals (“fx” and “fy”).
Key applications
– verification of metrological parameters of precision frequency signals sources;
– time and frequency etalon systems;
– computed control measurement systems;
– scientific research measurements.
Device control, collecting and display of measurement results are carried out by computer using RS-232, USB or LAN interfaces.
Manual for VCH-315M
– Operational Manual
download
– User Guide
download
Specifications
Input signals:
5, 10 or 100 MHz nominal frequency, (0.8−1.2) V into (50±1) Ohm load.
Maximal measured relative frequency difference:
±5.0·10
–9
Noise passband:
3 Hz.
Frequency instability, introduced by multichannel frequency comparator VCH-315M (at zero frequency difference between input signals, and on condition of temperature changing not more than ±1,0 °С per hour within the operating temperature range), is displayed in the table:
| Averaging interval | Frequency instability, noise floor * | |
|---|---|---|
| 1 channel mode (ADEV) | 2 channel mode (cross-ADEV) | |
| 1 s | 6.0·10 −14 | 2.0·10 −14 |
| 10 s | 2.0·10 −14 | 3.0·10 −15 |
| 100 s | 3.0·10 −15 | 1.0·10 −15 |
| 1 hour | 3.0·10 −16 | 2.0·10 −16 |
| 1 day | 1.0·10 −16 | |
| *Specified under condition: ambient temperature changing rate <1 °С/hour. | ||
Power: AC (220±22) V, (50±2) Hz, or DC (22−30) V.
Power consumption
is not more than 40 VA (for AC) and not more than 35 W (for DC)
Weight
is not more than 12 kg.
Warranty:
3 years.
Dimensions (W×H×D):
133.0×483.0×325.0 mm.
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