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CH1-75A Active Hydrogen Maser

  • The highest accuracy and short- and long-term frequency stability

  • Autonomous automatic cavity tuning (no external reference required)
  • Frequency drift: ≤5×10-16/day
  • Frequency accuracy: ±5.10–13

  • /year
  • Frequency stability: 7.10–16/day, 2.10–13/s

DESCRIPTION

 

The CH1-75A Active Hydrogen Maser is designed to operate as a high stability, precision spectral pure 5,10 and 100 MHz signal source and provides time scale signals of 1 s period.

The CH1-75A Active Hydrogen Maser provides the highest frequency stability among all industrial frequency standards known today.

The CH1-75A principle of operation is based on a quartz crystal oscillator, phase locked to the hyperfine transition of the hydrogen atom.

 

APPLICATIONS

 

National  timekeeping and  frequency services, ground control and surveillance points of satellite navigation systems,  very long baseline interferometry  (VLBI), for scientific research.

 

SPECIFICATIONS

 

Frequency Outputs: 5MHz,10 MHz  and  100 MHz (sine), 1±0.2 V rms  into 50 Ohm

Timing Output: 1 Hz (1pps)

Amplitude: >2.5 V into 50 Ohm

Width: 10–20 ms

Rise time: <15 ns

Jitter: <0.1 ns

Frequency  stability ( Allan Deviation)

1 s               £2×10–13

10 s             £3×10–14

100 s           £7×10–15

1 hour          £2×10–15

1 day            £7×10–16

 

(Although this is a rugged instrument which operates within   +10°C  to +35 °C ambient, the quoted specifications for  100 s, 1 hour and 1 day apply while the instrument is confined to a ±1°C ambient  temperature  change).

 

Temperature   sensitivity: 1.5×10–15/ ° C

Magnetic field sensitivity: <1×10–14/Gauss

Drift (aging): 2×10-15 /day at delivery, 5×10-16 /day after 1 year operation

Frequency trim range: 1×10–10

Setting resolution: 1×10–15 Steps

 

Phase noise:

 

Offset from carrier

SSB phase noise, dBc/Hz

10 Hz

–130

100 Hz

–140

1 kHz

–150

10 kHz

–150

 

Harmonic distortion: < 30 dB (for 5 MHz output)

Non-harmonic distortion: < –100 dB in the range from 10 Hz to 10 kHz

 

GENERAL

 

Power: 100, 120, 220 V±10 %, 240 V+5–10 %, 47–63 Hz or 22–30 V dc

At power line failure the Instrument automatically switches to an external 22–30 V dc Power Supply.

Power consumption: 150 VA ac, 100 W dc

Operating Temperature : +10°C  to +35 °C 

Storage temperature  : –50°C to +50 °C

Humidity: up to 80 % at 25 °C

Size: (H ×W ×D)  70.8×48.0×59.5  cm

Weight: 90 kg

Service Life: 15 years