NOVATECH INSTRUMENTS

Rubidium Frequency Standard

Model 1450A


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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
		t=10s		<0.8x10-11
		t=100s		<0.3x10-11

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

FREQUENCY ACCURACY

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.

SINEWAVE OUTPUTS

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

TTL OUTPUTS

Standard: Four of one of the standard frequencies
Optional: Up to seven of the standard frequencies or a synthesized frequency.

OUTPUT IMPEDANCE

50 ohm 10%

OUTPUT AMPLITUDE

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).

SIZE

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.

PHASE NOISE

10MHz output, typical (dBc/Hz)
	Freq. Offset   	
	1Hz		-75		
	10Hz		-89		
	100Hz		-128 	   	
	1kHz 		-140		
	10kHz 		-147

ENVIRONMENTAL

Temperature: 5 to 40 C operating
Humidity: 80% to 31C, decreasing linearly to 50% at 40C

LINE POWER

120/240 VAC 10%, 50/60Hz. 50 VA (70 VA during warm-up, <= 10 minutes). Rear panel power switch.

STATUS INDICATORS

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.

PRICING

Contact factory for additional options.

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Novatech Instruments , Inc.

P.O. Box 55997
Seattle, WA 98155 USA
206.301.8986, ntsales@eskimo.com, FAX 206.363.4367
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Technical Questions: novatech@eskimo.com