[volt-nuts] Fluke 343A part

Pete Lancashire pete at petelancashire.com
Wed Nov 7 19:44:15 UTC 2012

I've used Talon as well, their prices are usually only affordable by
taxpayers via their respective governments but like this one they have
surprised me in the past. One time they sent me the wrong part and
they sent me the replacement and asked at
my convience to send the other one back

On Wed, Nov 7, 2012 at 11:36 AM, Dick <richiem5683 at gmail.com> wrote:
> Thanks John -- You are the second one to suggest them. Talon is the deal for sure. I ordered two of these parts. Fluke used them in a lot of gear.
> Have any volt-nuts modified the chopper system of the 343A to reduce parts count and improve stability? Seems like a good place for an LT1150, OPA627 or some such to improve overall performance....
> Dick Moore
> On Nov 7, 2012, at 4:00 AM, volt-nuts-request at febo.com wrote:
>> Message: 1
>> Date: Tue, 6 Nov 2012 14:10:16 +0000
>> From: John Lofgren <jlofgren at lsr.com>
>> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
>> Subject: Re: [volt-nuts] Fluke 343A part
>> Message-ID:
>>       <5544E52D608067489823B4AED0BB6B570B0B7491 at Exchange2010.lsr.local>
>> Content-Type: text/plain; charset="us-ascii"
>> Talon Electronics shows a Fluke FP226043 as the replacement for the MEM556C.  They have 48 in stock at $5.12 with no minimum order.
>> http://www.talonix.com/shop/item.aspx?itemid=3978
>> -John
>> -----Original Message-----
>> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of Dick
>> Sent: Tuesday, November 06, 2012 1:06 AM
>> To: volt-nuts at febo.com
>> Subject: [volt-nuts] Fluke 343A part
>> I picked up a fairly new Fluke 343A and it appears that Q39, MEM556C p-chan. enhancement-mode MOS-FET is shorted. This part seems to be unobtanium unless you are named Romney, Gates, or Walton. Any suggestions on a replacement or an alternative method? This part is the input signal chopper transistor, driven by a multivibrator.
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