EEVblog #456 – CSIRO Rubidium Frequency Standard

Dave uses his CSIRO National Measurement Institute rubidium frequency standard to calibrate and adjust his Agilent 53131A frequency counter.
With bonus teardowns.
53131A schematics are HERE

Forum Topic HERE

About EEVblog

Check Also

EEVblog #1334 – Mystery Dumpster Teardown

Mystery dumpster teardown time! With the most amazing mechanical mains power switch you’ll ever see! ...


  1. Hi Dave,

    you may want to use a longer gate time, ie. 10s to do the calibration, and maybe terminate the input to 50 ohm.

    Thanks for your work in the EEVblog.


  2. FYI – I think the 53131A fan stays powered up because the power supply remains on to maintain power to the high stability oscillator when it is installed. From watching your video, I went and checked mine out (which has the option). It had been plugged in for a year or more but not turned on. I was surprised to find the oscillator over warm. Wonder how much life that burned out of it, and cost me in electricity…

    Yes, seems kinda crazy.

Leave a Reply

Your email address will not be published. Required fields are marked *