SIM940 Rubidium Frequency Standard0 pages

Small Instrumentation Modules
SIM940 — 10 MHz rubidium frequency standard

· Three 10 MHz outputs
· 1 pps input and output for
GPS synchronization
· 20 year aging less than 0.005 ppm
· Ultra-low phase noise
(<−130 dBc/Hz at 10 Hz)
· 72 hour Stratum 1 level holdover

· SIM940 ... $1995 (U.S. list)

SIM940 10 MHz Rubidium Frequency Standard
The SIM940 integrates a rubidium oscillator (SRS model
PRS10) into the SIM900 platform. It provides stable and
reliable performance with an estimated 20 year aging of less
than 5 × 10–9 and a demonstrated rubidium oscillator MTBF
of over 200,000 hours. The SIM940 is an ideal instrument for
calibration and R&D laboratories or any application requiring
a precision frequency standard.
There are three 10 MHz outputs with exceptionally low phasenoise and Allan variance. The SIM940 can be phase-locked to
an external 1 pps reference (like GPS), providing Stratum 1
performance. A 1 pps output is also provided that has less than
1 ns of jitter and may be set with 1 ns resolution.
All functions of the SIM940 can be controlled from a
computer via the SIM900 Mainframe. Both RS-232 and GPIB
interfaces are supported by the mainframe.

Stanford Research Systems

phone: (408)744-9040
www.thinkSRS.com