Date: Mon Oct 20 11:05:35 2008

Author: Megan Yasuda

Subject: Re: Electronics Schematic

Post:

Thanks, Gary. However, this is not the problem. The filter capacitors
seem to be in decent shape.

Gary Karshner wrote:
> Meg,
> Check the filter capacitors. They are one of the most common
> failures in power supplies and typically sort out that would explain
> your high current although the ammeter is typically in the circuit
> before the ammeter not after.
> Gary
>
> At 08:22 AM 10/20/2008 -0500, you wrote:
>> The power supply is rated at 55V at 38 amps.
>> When everything is turned down to zero, and a load is applied to the
>> magnet, the meters we put on it are reading max amps.
>> We can't figure out how we can read max amps when everything is set
>> to zero.
>>
>> Any help would be appreciated. Eventually our electronics guy will
>> just start pulling parts and hope he gets lucky.
>>
>> Meg
>>
>> Chuck Patten wrote:
>>> Any idea what the specifications are? I think that Alpha Scientific
>>> stopped
>>> making power supplies in the late 1980's. How is it malfunctioning
>>> please?
>>>
>>> cheers,
>>> chuck...
>>> -----Original Message-----
>>> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
>>> Behalf Of Megan Yasuda
>>> Sent: Friday, October 17, 2008 8:02 AM
>>> To: tap-l@lists.ncsu.edu
>>> Subject: [tap-l] Electronics Schematic
>>>
>>> Last week, we attempted to start up our old Hall Effect experiment
>>> which has
>>> been dormant for years. We discovered that the power supply is no
>>> longer
>>> functioning properly.
>>> I cannot find any paperwork on it and am looking for a schematic. Does
>>> anyone have it?
>>>
>>> The information on the power supply is:
>>>
>>> Alpha Scientific Inc.
>>> model #45-30
>>> serial # 4244
>>>
>>> We believe the power supply is over 40 years old.
>>> Thanks.
>>> Megan
>>>
>>>
>>>
>>
>> --
>> Megan Yasuda
>> Physics Lab Technician/Radiation Safety Officer
>> University of Northern Iowa
>> Department of Physics
>> (319) 273 6234
>>
>

--
Megan Yasuda
Physics Lab Technician/Radiation Safety Officer
University of Northern Iowa
Department of Physics
(319) 273 6234




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