[volt-nuts] Which meter?

[Greg Burnett]

Bill - The Fluke 845A/B, 750A, 332 series and 335 series are obsolete. 
Spec'd at only 10ppm accuracy, how would the 750A reference divider fit 
Bram's project? (For comparison the 3458A's linearity is > 100x better than 
the 750A.)

Also how would the 332 or 335 series be good enough sources for a LTZ1000A 
UUT project? (For comparison the 332 & 335 short-term noise might be 
typically 50x greater than the 3458A, according to my measurements.)

:) Greg


----- Original Message ----- 
From: "WB6BNQ" <wb6bnq at cox.net>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Saturday, November 14, 2009 2:13 PM
Subject: Re: [volt-nuts] Which meter?


Bram,

You need to consider a different method !  You would be better off renting a
Fluke 732 voltage transfer standard with current calibration and a Fluke 
845A/B
(desk version - not the rack mount version) null meter.  The desk version 
has a
high isolation resistance then the rack mount unit.

The 845 series null meter has a DC output on the rear that is a full scale
representation of whatever scale you have selected on the front panel.  This 
way
you can use just about any piece of crap meter with computer connections to 
log
the results.

I am assuming you are setting the LTZ1000 to a standard 10 volts.  If not 
you may
need to use a good divider; either a Fluke 750A or the Fluke 720A Kelvin 
divider
if you have a weird voltage level below 10 volts.  If you have a voltage 
that is
higher then you may need a good high quality voltage source like the Fluke 
332 or
335 or one of the newer ones from Fluke.

Bill....WB6BNQ