[time-nuts] [Bulk] PRS10 Rubidium

[J. L. Trantham]

Did the oven 'controller' fail and 'over cook' the lamp?

Sort of looks like what happened to my 5065A when the heater turned on and never turned off.

Joe

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Jürg Kögel
Sent: Sunday, February 22, 2015 9:44 AM
To: Discussion of precise time and frequency measurement
Subject: [Bulk] [time-nuts] PRS10 Rubidium

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



 Juerg