[Milsurplus] URM-25F meter?

[Peter Gottlieb]

  This is indeed microsurgery.  The bobbin form has the wire wound on it then at 
top and bottom the shafts are glued on, on top of the winding.  Most likely I 
would have to unglue one of these, fix the open, and reglue in the proper 
alignment.  Without a fixture this isn't likely to be successful.  Also consider 
that this is very very tiny and I would have to work under a microscope which I 
don't have.  Also, it looks like it will require some sort of clamp to hold 
pieces to the magnet to even remove it from the case to work on, as soon as I 
remove the two nuts holding everything both together and into the case.

I see myself having three realistic alternatives if I can't find a meter, in my 
order of preference:  1, find another 100 uA 90 degree meter with a similar size 
and attach the scale to it; 2, sell the unit to someone on the list for a decent 
price who has an otherwise messed up unit or doesn't care about the meter, or 3, 
scrap the thing for aluminum and parts.

Peter


On 10/18/2010 10:34 PM, John Hutchins wrote:
>    Peter -
> There is a article on the web about repairing meters such as this.  If
> you are lucky you could unwind one turn and re-solder,  that is if the
> open is at the tie point.
> -Hutch
>
> On 10/18/2010 8:17 PM, Peter Gottlieb wrote:
>>     I picked up a decent condition URM-25F signal generator cheaply at a hamfest.
>>
>> Unfortunately, even though it produces output, the meter turns out to be open.
>> Upon removing from the panel I can see that it had already been opened up,
>> actually unsealed by unsoldering the face glass, then carefully reassembled so
>> it would look untouched from the outside (without resoldering).  Careful further
>> disassembly and measurement shows the coil itself to be open rather than a
>> connection.
>>
>> This makes it essentially unrepairable.
>>
>> Would anyone have such a meter laying around?  It is a 100 uA FS, 2.35" flange
>> OD meter with a uV top scale and a % mod bottom scale.  This one is a Burlington
>> Instrument model 321.
>>
>>
>> Peter
>>
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