Date: Fri Aug 8 15:24:29 2008

Author: Bill Norwood

Subject: Re: Labor-Intensive Fuse Replacement in DMM's

Post:

Hi Machele,

I will send you pics of the Keithley modification.
And I will also send to anyone else who requests them.

Thanks, Bill

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Machele Kindle
Sent: Thursday, August 07, 2008 9:29 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Labor-Intensive Fuse Replacement in DMM's

Oh man, I can relate to this. I strained my wrist once because of how
many fuses I was having to change for lab that week.

How did you modify the Keithley?

Chele

Bill Norwood wrote:
>
> Hi Taplers,
>
> For over 20 years it was necessary to disassemble our Keithley Model
> 168 digital multimeters
>
> every time a fuse blew in the current-measuring circuit, and that was
> often.
>
> Now it's 20 years later, and, guess what, the meter-makers
>
> still haven't gotten the message that students blow a lot of fuses.
>
> Yes, I know, students NEED to blow fuses
>
> just to live out the foolish experience of improper circuit testing.
>
> It's just that I do not need the experience of the consequences,
>
> and we cannot trust the inexperienced students to take apart the
> meters for fuse replacement.
>
> So far I have not been able to identify a new meter model which has
> the fuse externally replaceable.
>
> For example, the following do not have this facility:
>
> Keithley 168 (old)
>
> BK Precision 2831D (~$300)
>
> HP 34405A (recent $674 quote)
>
> Instek GDM-8145 (recent $310 quote)
>
> So, it will probably be a project of modifying each meter for external
> fuse replacement,
>
> as I did with one of the Keithley 168's.
>
> Thanks for any remarks or other information.
>
> Bill Norwood
>
> U of MD at College Park
>

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For in the end, we will conserve only what we love.
We will love only what we understand.
We will understand only what we are taught. - Baba Dioum
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