Stanford Research FS725 Rubidium Frequency Standard

A short functional check on a FS725 Frequency Standard.
Manual found here: www.thinksrs.c...
Sorry for the typo in the opening :( Seems like I review these 3x and still miss something....

[@RapperBC]

I'll second that emotion: you found gold there.
This is absolutely the lowest-jitter reference clock in existence that doesn't cost as much as a house. They're still made now, and they still look exactly like that.

[@ivolol]

Found lab-grade hundreds-of-dollars worth precision equipment in e-waste! Wish I could get your kind of e-waste! 1PPS input is to hook to a GPS' 1PPS output, so for instance you can synchronise it to global UTC time. If it's working correctly the only way to check its accuracy is against a GPS signal averaged over many hours / days, or an actual atomic clock. Most higher end lab equipment that deals in time / frequency would have a 10Mhz reference signal to hook it up to, so from one clock all of your equipment becomes super accurate.

[@eeengineer8851]

Thanks. Knowing what eWaste I got this from, it could have once been in a test rack for some GPS units (probably for a design life type test) so that makes sense.

[@y_pika5324]

I had owned this one in my lab.

[@soundsokok]

is it the lowest jitter rubdium clock you ve found ? cheers

[@eeengineer8851]

Hello, I have not ever worked with one of these prior so no background to judge this one.

[@dtiydr]

Those are priced way higher used than I thought, unreasonable high as well.

[@ivolol]

Most used lab equipment rocketed up in price the last 5/10 years. I imagine there was a huge glut of it being sold off in the 2000s/early 2010s lowering prices, but that has dried up now.

[@dtiydr]

@@ivolol Yea no doubt about it, since It was less than 10 years ago since I saw some of these go for like 30 - 35 buck, working, not working like 25.