Product category:
Stand-Alone Instruments
News Release from: TTi (Thurlby Thandar Instruments) | Subject: SRS FS725
Edited by the Electronicstalk Editorial
Team on 28 February 2005
Frequency precision comes as standard
The SRS FS725 benchtop rubidium frequency standard is ideally suited to use in calibration and R and D laboratories, or in any other application requiring a precision frequency standard.
The SRS FS725, now available in the UK from TTi (Thurlby Thandar Instruments), is a benchtop rubidium frequency standard that is 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 Electronicstalk on 12 May 2000 at 8.00am (UK)
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It provides stable and reliable performance with an estimated 20-year aging of less than 5ppb, and a demonstrated rubidium oscillator MTBF of over 200kh.
There are two 10MHz outputs and one 5MHz output with exceptionally low phase noise (-130dBc/Hz at 10Hz offset) and 1s Allan variance (less than 0.02ppb).
Both terms relate to GPS standards.
The FS725 can be phase-locked to an external 1 PPS (Precise Positioning Service) reference as used in GPS systems, providing Stratum 1 clock standard performance as defined by ANSI.
A 1 PPS 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 1 PPS 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 1 PPS input.
The relays are SPDT, providing both normally open and normally closed control.
An RS232 interface allows direct communication with the rubidium oscillator.
Using the Windows software provided, users can easily monitor and control 1 PPS timing, and determine the instrument's operational status.
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