Right, to follow up on my own email
I took it apart
The lamp assembly has failed.
In the PRS10 the lamp is exited by a strong RF field @ 150Mhz
this is generated by an MRF134 within the lamp package
The failure mode was caused by the growth of a substantial tin whisker
within the lamp assembly which appears to have killed the MRF134.
I made contact with SRS about purchasing a replacement lamp assembly but
since I bought it on the used market they are not willing sell me a
replacement lamp assembly. Frankly I am not terribly impressed with
their response on this.
Does anyone on list have a 'donor' PRS10 that might have a good lamp
assembly that they would be willing to sell me ?
Perhaps someone on list has a commercial relationship with SRS and might
be able to assist me with purchasing it?
Hoping someone can help out, My alternative is to attempt to source an
MRF134 and have a go at replacing it but there may be other damage in
there
regards
Brendan
On 14/02/2011 18:53, Brendan Minish wrote:
Hello all
My SRS PRS10 ( http://www.thinksrs.com/products/PRS10.htm ) Rubidum
frequency standard was power cycled a few days ago, since then it has
not achived rubidium lock.
I have tried a full rest and also further power cycles with no joy.
The SRS RS232 application reports the following parameters that 'look
wrong'
ad3 (lamp drain ) 2.001
sd2 (fet voltage set ) 255
ad3 at 2 (Lamp drain volatge 20V) would appear to correspond with the Rb
lamp discharge not beginning
this unit is of course out of guarantee and came to me via Ebay about 5
years ago, is anyone on list familiar with troubleshooting these units
who Might have some general ideas of how best to proceed with repairing
the unit
--
73
Brendan EI6IZ
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