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Multichannel Frequency Comparator VCH-315MnewMultichannel 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.
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 °Ñ per hour within the operating temperature range), is displayed in the table:
| Averaging interval |
Frequency instability, noise floor by Multichannel frequency
comparator VCH-315m |
| 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 h and more |
≤3.0×10–16 |
≤2.0×10–16 |
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.
Dimensions (W×H×D): 133.0×483.0×325.0 mm.
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