[time-nuts] PRS10 Rubidium

paul swed paulswedb at gmail.com
Sun Feb 22 16:02:22 EST 2015

Interesting so it looks like what ever the standoff material is out gassing.

On Sun, Feb 22, 2015 at 2:57 PM, Hans Holzach <hans.holzach at gmail.com>

> hi jürg,
> dispite the fact that my prs-10 has been up and running for only about 2
> years (according to FC!?), the lamp assembly looks pretty ugly (see
> picture) as if it was overheated quite a bit. i bought the unit from ebay,
> so i have no idea under what conditions it had spent its life before i got
> it. the unit works, but the frequency is not as stable as i expected.
> https://farm9.staticflickr.com/8652/16589402796_3a2e1e66c9_o.jpg
> in my opinion the breakout board should work with your second unit. but
> you have to enable the pps PLL (instruction is: PL1). check the manual,
> page 33 ff., also to set the time constant.
> regards,
> hans
> Fellow time nuts. I have two SRS PRS10 Rb’s that I did purchase 10 years
> ago. Both have been working for the last nine years. One did fail last year
> and I finally got around to looking at it in the last two weeks. The
> attached picture shows the trauma to the lamp board. I do not understand
> the corrosion since it has been in a very controlled environment in my
> basement.
> Since the failed unit does have the 1 pps loop control I moved the
> processor board to the still working unit. Did not work. Does it take more
> than just moving that one board to get 1 pps loop control?
> Second any ideas as to what may have happened to the lamp heater board. Any
> recommendations? Plan on making a replacement board. Have a power FET
> MRF134
> Thanks
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