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¤ýHydrogen Masers
Product Overall
Active Hydrogen Frequency Standard VCH-1003A
Active Hydrogen Maser VCH-1003M
Active Hydrogen Frequency Standard VCH-1005
Passive Hydrogen Maser VCH-1008 new (in development)
¤ýGPS Synchronization Equipments
¤ýPrecise Time & Frequency for Metrology
¤ýTelemetry Systems and Products
¤ýFilter Connector
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Hydrogen Masers > Passive Hydrogen Maser VCH-1008 new (in development)
 
Passive Hydrogen Maser VCH-1008 new
(in development)
VCH-1008 Passive Hydrogen Maser is a small size hydrogen maser with the best frequency stability. Extremely high frequency stability is provided by state-of-the-art technology. Full digital processing of modulation and servo loop signals is realized. Ideal for high-accuracy measurements applications. Internal GPS/GLONASS calibrator (option) supports permanent automatic output signals frequency calibration.
Key Applications
  • National Time Keeping Service;
  • Space tracking and navigation;
  • Verification of metrological parameters of frequency signals sources;
  • Scientific researches.
Specifications
Output signals
  • Sine:5 MHz; 10 MHz; 100 MHz, (1 ¡¾ 0.2) V RMS into 50 ¥Ø load.
  • Pulse: 2,048 MHz (square pulse), (1,5 ¡À 2,8) V (pp) into 75 ¥Ø (ITU-T G.703 part13).
  • 1Hz; 1/60 Hz, positive polarity pulse, width (10 ¡¾ 0.1) ¥ìs, TTL level into 50 ¥Ø,
  • rise time: < 10 ns.
Metrological characteristics are given in the table:
Relative frequency accuracy

¡¾3¡¿10e-13
(factory calibration)

¡Â¡¾1¡¿10e-13
(in option with GPS/GLONASS calibrator)

Output signals frequency corrector

resolution
retuning range

1¡¿10e-15
1¡¿10e-10

Frequency stability
(Allan deviation at (25¡¾1)C¡Æ, environmental
effects are excluded)

1 s

¡Â5.0¡¿10e-13

10 s

¡Â2.0¡¿10e-13

100 s

¡Â5.0¡¿10e-14

1 hour

¡Â9.0¡¿10e-15

1 day

¡Â4.0¡¿10e-15

Phase noise spectral density (dBc/Hz)
(5 MHz output)
Frequency offset Spectral density

1 Hz

¡Â−105

10 Hz

¡Â−130

100 Hz

¡Â−145

1000 Hz

¡Â−155

Manual synchronization to external
1 pps TTL signal

¡Â¡¾25 ns

Time synchronization to UTC using GPS

¡Â¡¾50 ns(in option with GPS calibrator)

Temperature sensitivity in operating temperature range (+5¡À+35)C¡Æ

¡Â¡¾2¡¿10e-14 1/C¡Æ

Magnetic sensitivity

¡Â¡¾2¡¿10e-14 1/Oersted

Digital control and monitoring all operating parameters on LCD display or remotely.
Interface: RS-232C; USB; LAN.
Power: AC, 100–240 V, 50-60 Hz, or DC, (22~30) V.
Power consumption: 120 VA AC, 100 W DC.
Options: 1. DC power supply - (38, 4 – 57, 6) V (two inputs); 2. Internal battery for 4 hours autonomous operation; 3. Internal GPS calibrator for automatic output signals frequency calibration.
Dimensions (WxHxD): 470 mm¡¿200 mm¡¿530 mm.
Weight: 33 kg.
Warranty: 3 years.
Life time: 15 years.