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SRS SR625 Rubidium Stabilised Frequency Counter

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Product Code: 14961
Manufacturer: Stanford Research Systems

  • 12 digit frequency resolution

  • Rubidium atomic timebase

  • 2 GHz direct prescaler input

  • Short 10 minute warmup period

  • Portable operation

  • 10 MHz Rb timebase output

  • GPIB and RS-232 interfaces

Lambda Exclusive Promotion:
Additional 12 months warranty for free (2 years total) via our UK Service Centre.

The Stanford Research Systems SR625 Frequency Counter is a NIST traceable frequency counting standard for calibarating base stations, transmitters and many other types of communication systems. It combines the high resolution and wide variety of features found in the SR620 counter with the atomic accuracy of a rubidium timebase.


The SRS SR625 Frequency Counter consists of a SR620 Time Interval Analyser plus a high accuracy rubidium timebase and 2 GHz input prescaler. The combination of the SR620 and the prescaler allow direct frequency measurements up to 2 GHz with twelve digits of resolution in a 100 second gate. The rubdium timebase ensures both excellent short term stablity (


The SR625's warm up time is less than ten minutes, making it ideal for field applications. An additional back panel output provides a rubidium stablised 10 MHz signal which can be used to drive other test equipment such as synthesisers or spectrum analysers. The standard GPIB and RS-232 interfaces allow for complete control and data acquisition from any laboratory computer. The SR625's performance makes it the standard for remote applications or laboratory calibration.

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