CH1-75A Active Hydrogen Maser

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

–14<">0

1 kHz

–15<">0

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