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Active Hydrogen Frequency Standard VCH-1003A

The VCH-1003A is a high-performance hydrogen maser with built-in frequency comparator. Extremely 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 researches.

Specification

Output signals:
- Sine: 5 MHz; 10 MHz; 100 MHz; (10.2) V RMS into 50 Ω load;
- Pulse: 1 Hz (pps), positive polarity, amplitude: >2.5 V into 50 Ω load;
- width: 155 s; 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 (251)C,
environmental effects are excluded)
1 s ≤2.0×10−13
10 s ≤2.0×10−14
100 s ≤7.0×10−15
1000 s ≤3.0×10−15
1 hour ≤1.5×10−15
1 day ≤2.0×10−15
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 ≤−118
10 Hz ≤−135
100 Hz ≤−149
1000 Hz ≤−156
Manual synchronization to external 1 pps
TTL signal accuracy
≤50 ns
Temperature sensitivity in operating
temperature range (+10÷+35) C
≤3×10−15 1/C
Magnetic sensitivity ≤1×10−14 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: 150 VA AC, 100 W DC.
Dimensions (W×H×D): 550×990×550 mm.
Weight: 95 kg.
Warranty: 3 years.
Live time:15 years.

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