[volt-nuts] Homebrew DVM
randallgrayevans at yahoo.com
Thu Nov 10 16:20:58 UTC 2011
8.5 digits with averaging.
I did consider that but the ADCs I am familiar with only have a 5V input range so range resistors would be required, not desirable for me. Also, they won't directly take the 7.2V ref input from a LTZ1000. Plus the AN-260 circuitry is not too complex. Otherwise, I agree with you.
From: Poul-Henning Kamp <phk at phk.freebsd.dk>
To: Randy Evans <randallgrayevans at yahoo.com>; Discussion of precise voltage measurement <volt-nuts at febo.com>
Sent: Thursday, November 10, 2011 7:51 AM
Subject: Re: [volt-nuts] Homebrew DVM
In message <1320939951.98248.YahooMailNeo at web37902.mail.mud.yahoo.com>, Randy E
>My hope is that the DVM will be able to measure to 8.5 digits [...]
Do you mean 8.5 digits single-shot, or 8.5 digits with averaging ?
Considering that you can get off-the shelf ADC's where 24 bit is routine
and 26 bits available, I'm not sure I'd bother...
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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