[volt-nuts] Fluke 332B

[David C. Partridge]

Thanks Charles, 

Dave

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of Charles Steinmetz
Sent: 09 July 2017 13:31
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 332B

David wrote:

> When running through the calibration of the unit last night, I found 
> that it was really quite noisy
 >
> So, is it worthwhile to replace the chopper amplifier board and 
> replace electrolytic caps or would that just make marginal 
> improvements
>
> If it would still be an unstable, noisy brute after I finished that, then I think I'll put it on eBay ...

My experience with these extends back to when they were new.  They are definitely noisy even when they are in perfect condition, and this many years on they tend to be quite unreliable even if they have been thoroughly gone through.  Also, something I haven't seen mentioned much is that the last decade (LSD) is purely for decoration.  The accuracy of the 332 on its best day is worse than one division of the second-last decade.

In my expeience, the original choppers work very well unless they are broken.  I do not expect that a chopper-stabilized op amp would provide meaningful improvement.

I advise passing on the 332A/B/D and holding out for a 5440B.  You will not be sorry.

Best regards,

Charles


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