The VCH-1009 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, positive polarity pulse, width 15±5 μs, TTL level at 50 Ω, rise time:
<2 ns.
Metrological characteristics are given in the table:
| 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 | ≤7.0·10 −14 | |
| 1 day | ≤3.0·10 −15 | |
| 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 |
| Phase noise spectral density (dBc/Hz) (10 MHz output) | Frequency offset | Spectral density (dBc/Hz) |
| 10 Hz | ≤−130 | |
| 100 Hz | ≤−150 | |
| 1000 Hz | ≤−160 | |
| Manual synchronization to external 1 pps TTL signal accuracy | ≤±10 ns | |
| Time synchronization to UTC using GPS | ≤±20 ns (using optional GPS calibrator) | |
| Temperature sensitivity in temperature operating range (10−40 C°) | ≤±5·10 −15 1/C° | |
| Magnetic sensitivity | ≤±5·10 −15 1/Oersted | |
Full data monitoring and functions control. Application software running under Microsoft Windows.
Interface:
RS-232C; LAN.
Power supply:
AC(100÷240)V, (50÷60)Hz; DC(21÷72)V.
Power consumption:
100 V·A (AC), 100 W (DC).
Options:1.
Built-in battery to prevent temporary power failure (li-ion 3 Ah);
2.
Internal GPS calibrator for automatic calibration.
Dimensions (W×H×D):
483×133×560 mm.
Weight:
20 kg.
Warranty:
5 years.
Life time:
15 years.
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