Product category:
Test and calibration instrumentation
News Release from: TTi (Thurlby Thandar Instruments) | Subject: FS725
Edited by the Laboratorytalk Editorial
Team on 28 February 2005
Benchtop rubidium frequency standard
Integrates a rubidium oscillator, power supply, and distribution amplifiers to provide stable and reliable performance with a demonstrated rubidium oscillator MTBF of over 200,000 hours
The SRS FS725, now available in the UK from TTi (Thurlby Thandar Instruments), is a benchtop rubidium frequency standard that is said to be ideally suited to use in calibration and R and D laboratories, or in any other application requiring a precision frequency standard The FS725 integrates a rubidium oscillator (SRS model PRS10), a low-noise AC power supply, and distribution amplifiers in a compact, half-width 2U chassis
This article was originally published on Laboratorytalk on 4 Jun 2001 at 8.00am (UK)
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It provides stable and reliable performance with an estimated 20-year aging of less than 5x10^-9, and a demonstrated rubidium oscillator MTBF of over 200,000 hours.
There are two 10MHz outputs and one 5MHz output with exceptionally low phase noise (-130dBc/Hz at 10Hz offset) and one-second Allan variance (less than 2x10^-11).
Both terms relate to GPS standards.
The FS725 can be phase-locked to an external 1pps (precise positioning service) reference as used in GPS systems, providing Stratum 1 clock standard performance as defined by Ansi.
A 1pps output is also provided that has less than 1ns of jitter, and may be set with 1ns resolution.
Up to three internal distribution modules can be added to the FS725.
Each module has four 10MHz outputs, one 5MHz output, and one 1pps output, all with the same low phase noise, harmonic distortion and jitter.
There are two alarm relays that indicate the status of the rubidium oscillator lock state and synchronisation to an external 1pps input.
The relays are SPDT, providing both normally open and normally closed control.
An RS-232 interface allows direct communication with the rubidium oscillator.
Using the Windows software provided, users can easily monitor and control 1pps timing, and determine the instrument's operational status.
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