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Active Hydrogen Frequency Standard VCH-1005The VCH-1005 is a high-performance hydrogen maser with a built-in frequency comparator. Extremely high frequency stability is provided by state-of-the-art technology. Ideal for high-accuracy measurement applications, particularly in metrology.
Key Applications
- National Time Keeping Service;
- Deep space tracking and navigation;
- VLBI systems;
- Scientific recearches.
Specifications
Output signals:
- Sine: 5 MHz; 10 MHz; 100 MHz; (1±0.2) V RMS into 50 Ω load;
- Pulse: 1 Hz (pps), positive polarity, amplitude: >2.5 V into 50 Ω load; width: (15±5) µs; rise time:<10 ns.
Metrological characteristics are given in the table:
| Relative frequency accuracy |
±3×10−13
(factory calibration) |
| Output signals frequency corrector |
resolution
returning range |
1×10−15
1×10−10 |
Frequency stability (Allan deviation at (25±1)°C,
environmental effects are excluded) |
1 s |
≤3.0×10−13 |
| 10 s |
≤3.0×10−14 |
| 100 s |
≤8.0×10−15 |
| 1 hour |
≤3.0×10−15 |
| 1 day |
≤3.0×10−15 |
| Long term frequency stability |
<1.0×10−15/day
Achieved in cavity autotuning mode together with
another identical maser. |
Phase noise spectral density (dBc/Hz)
(5 MHz output) |
Frequency offset |
Spectral density |
| 1 Hz |
≤−115 |
| 10 Hz |
≤−135 |
| 100 Hz |
≤−145 |
| 1000 Hz |
≤−155 |
Manual synchronization to external 1 pps
TTL signal accuracy |
≤±50 ns |
Temperature sensitivity in operating
temperature range (+10÷+35) °C |
≤±1×10−14 1/°C |
| Magnetic sensitivity |
≤±2×10−14 1/Oersted |
Full data monitoring and functions control (local or remote through
any network) performs by personal computer.
Software running under Microsoft Windows 2000, XP, Vista 7 is applied.
Power: 220 V, 50 Hz AC; or (22÷30) V DC.
Power consumption: 250 VA AC, 200 W DC.
Dimensions (W×H×D): 600×1585×900 mm.
Weight: 225 kg.
Warranty: 3 years.
Live time: 10 years.
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