[time-nuts] SRS PRS10 problem

Adrian rfnuts at arcor.de
Wed Feb 16 21:30:59 UTC 2011


MRF134's are available on *pay and from other sources for a LOT less $$ 
than a lamp assy would cost if available.

Adrian

Brendan Minish schrieb:
> 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
>>
>>
>
>




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