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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 10±0.1 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
retuning 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 |
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 |
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
(10−35 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: 100–240 V AC, 50–60 Hz, or 22–30 VDC.
Power consumption: 120 VA AC, 100 W DC.
Options: 1. DC power supply 38.4–57.6 V (two inputs); 2. Built-in battery to prevent temporary power failure; 3. Internal GPS calibrator for automatic calibration.
Dimensions (W×H×D): 470 mm×200 mm×530 mm.
Weight: 33 kg.
Warranty: 3 years.
Life time: 15 years.
Download manual
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