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, [email protected] wrote: > Message: 1 > Date: Tue, 6 Nov 2012 14:10:16 +0000 > From: John Lofgren <[email protected]> > To: Discussion of precise voltage measurement <[email protected]> > Subject: Re: [volt-nuts] Fluke 343A part > Message-ID: > <[email protected]> > 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: [email protected] [mailto:[email protected]] On > Behalf Of Dick > Sent: Tuesday, November 06, 2012 1:06 AM > To: [email protected] > 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. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
