Date: Mon Oct 20 11:25:13 2008

Author: Santos Ramirez

Subject: Re: Electronics Schematic

Post:

Just a couple of questions-
Have you tried connecting the power supply output to a different
load, one of a higher resistance?..
Does the power supply have a voltage/current control, have you
tried to increase the control while connected to the load- any
change?



> 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
>
>
>


--
Santos Ramirez
Technical Laboratory Coordinator
Physics Laboratory Center Heldenfels Hall
Department of Physics
Texas A&M University
College Station, TX 77843-4242
U.S.A.
Phone: (979) 845-5236
Email: Ramirez@physics.tamu.edu




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