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Passive Hydrogen Maser VCH-1008The VCH-1008 Passive Hydrogen Maser is a compact hydrogen maser with excellent frequency stability and utilises state-of-the-art technology. Full digital processing of the modulation and servo loop signals makes it ideal for high accuracy applications. An internal GPS/GLONASS option is available and provides automatic output signal frequency calibration.
Key applications:
- National Time Keeping Service;
- Space tracking and navigation;
- Verification of frequency signals;
- Scientific research.
Specifications
Output signals:
Sine: 5 MHz; 10 MHz; 100 MHz, (1±0.2) V RMS into 50 Ω load.
Pulse: 2.048 MHz (square pulse), 1.5÷2.8 V (pp) into 75 Ω (ITU-T G.703 part15).
1Hz; 1/60 Hz, positive polarity pulse, width 100±0.1; 10±0.01; 1±0.01; 0.1±0.01 μs, TTL level at 50 Ω, rise time: <10 ns.
Metrological characteristics are given in the table:
| Relative frequency accuracy |
±3·10−13
(factory calibration) |
≤±1·10−13
(in option with GPS calibrator) |
| Output signals frequency corrector |
resolution
tuning range |
1·10−15
1·10−10 |
Frequency stability
(Allan deviation at 25±1C°, environmental
effects are excluded) |
1 s |
≤5.0·10−13 |
| 10 s |
≤2.0·10−13 |
| 100 s |
≤5.0·10−14 |
| 1 hour |
≤9.0·10−15 |
| 1 day |
≤4.0·10−15 (2.0·10−15 typ.) |
Phase noise spectral density (dBc/Hz)
(5 MHz output) |
Frequency offset |
Spectral density (dBc/Hz) |
| 1 Hz |
≤−105 |
| 10 Hz |
≤−130 |
| 100 Hz |
≤−145 |
| 1000 Hz |
≤−155 |
| 10000 Hz |
≤−155 |
Manual synchronization to external 1 pps
TTL signal accuracy |
≤±25 ns |
| Time synchronization to UTC using GPS |
≤±50 ns (using optional GPS calibrator) |
Temperature sensitivity in temperature operating range
(10−40 C°) |
≤±1·10−14 1/C° |
| Magnetic sensitivity |
≤±2·10−14 1/Oersted |
Digital control and monitoring: all operating parameters on local LCD display, or also available remotely.
Interface: RS-232C; USB; LAN.
Power supply: AC(100÷240)V, (50÷60)Hz; DC(22÷30)V.
Power consumption: 120 V·A (AC), 100 W (DC).
Options: Internal GPS/GLONASS calibrator for automatic calibration.
Dimensions (W×H×D): 470×200×530 mm.
Weight: 27 kg.
Warranty: 3 years (10 years extended).
Life time: 15 years.
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