Rubidium Frequency Standard
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Last Modified June 20, 2002
The Model 1450A Rackmount Rubidium Standard has three simultaneous
sinewave outputs of 10MHz, 1MHz and 100kHz. Up to eight additional
sine and up to seven TTL outputs can also be provided. These
additional outputs can be one of the standard frequencies or they can
be synthesized outputs that are programmable from 100Hz to 30MHz
in 1.0e-6 Hz steps. The synthesized outputs are locked to the rubidium
clock. The 1450A contains an Atomic Resonance Rubidium Oscillator and
has long term stability of better than 5x10-11 per month. It is ideal
for use as a master oscillator in laboratories and ground stations as
well as for test and calibration.
FREQUENCY STABILITY (±)
Short Term t=1s <2.5x10-11
Aging Monthly <5x10-11 after 1 month
Yearly <5x10-10 after 1 year
Temperature +5 to +40C <4x10-10
Line Voltage(± 10%) <0.4x10-11
At shipment: <= ±5x10-11 at 25C internal baseplate temperature.
Retrace: <= ±4x10-11 of previous frequency (constant temperature) after 24 hours ON and up to 48 hours OFF.
Standard: 10 MHz, 1 MHz and 100 kHz simultaneously plus four auxilliary outputs of one of the standard frequencies.
Optional: Up to 8 sinewave auxiliary outputs. These can be factory set to any one of the standard values or to a synthesized value. Synthesized values can be from 100 Hz to 30MHz in 1uHz steps and are locked to the internal rubidium oscillator.
Connectors: Rear mounted BNC Female
Standard: Four of one of the standard frequencies
Optional: Up to seven of the standard frequencies or a synthesized frequency.
50 ohm ± 10%
Approximately 1 Vrms into 50 ohms (10 MHz, 1 MHz, 100 kHz)
Approximately 0.5 Vrms into 50 ohms (auxiliary outputs)
TTL: VOL < 0.5 V , VOH > 2.5 V , 30 pF load (series terminated).
3.47" H, 16.73" W, 12.0" D excluding rack handles and connectors. (Standard 3.5" high, 19" rack)
SPECTRAL PURITY (Typical)
10 MHz, 1 MHz, 100 kHz: Harmonic: <-40 dBc, Non-Harmonic: <-70 dBc.
10MHz output, typical (dBc/Hz)
Temperature: 5 to 40 C operating
Humidity: 80% to 31C, decreasing linearly to 50% at 40C
120/240 VAC ±10%, 50/60Hz. 50 VA (70 VA during warm-up, <= 10 minutes). Rear panel power switch.
POWER OK Front panel LED indicates power is on.
RUBIDIUM LOCK Front panel LED and rear panel TTL level signal indicate output is locked to Rubidium Oscillator.
Contact factory for additional options.
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Novatech Instruments , Inc.
P.O. Box 55997
Seattle, WA 98155 USA
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