[volt-nuts] 3478A - Kelvin Klips

[shalimr9 at gmail.com]

The HP 3456A has an offset compensation feature in the Ohm mode (2 and 4 wires) that compensates for DC voltages in series with the resistance to be measured.
This will null any thermocouple generated voltage.

This function is not selected by default, it is accessible via the appropriate function key (O.C. Ohms).

Didier

Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Brooke Clarke <brooke at pacific.net>
Sender: volt-nuts-bounces at febo.com
Date: Mon, 03 Jan 2011 14:09:24 
To: <jfor at quik.com>; Discussion of precise voltage measurement<volt-nuts at febo.com>
Reply-To: Discussion of precise voltage measurement <volt-nuts at febo.com>
Subject: Re: [volt-nuts] 3478A - Kelvin Klips

Hi John:

A lot depends on how low.  I did a lot of testing using the 34401A DMM 
in 4-wire mode and determined that the DC method is not accurate below 
50 milliohms because of voltage generation.  This testing was done using 
the HP 11059A Kelvin lead set.
http://www.prc68.com/I/Kelvin.shtml
Links to Kelvin clips and part numbers at the bottom of the above page.

For 100 milliohms and lower you need to use an AC method, like the 4328A
http://www.prc68.com/I/HP4328A.shtml

Have Fun,

Brooke Clarke
http://www.PRC68.com


J. Forster wrote:
> A bunch of people on eBay sell knock-off Kelvin Klips. I'd like to get a
> set for 4-terminal Ohms with my 3478A.
>
> Does anybody have any experience on which are good and which are trash? I
> do have a slight preference for made-up lead sets w/ Bananna Plugs on the
> meter end.
>
> I am not interested in 8 digit accuracy, just being able to measure low
> ohms w/o contact issues.
>
> Best,
>
> -John
>
> =================
>
>
> _______________________________________________
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
>
>
>    

_______________________________________________
volt-nuts mailing list -- volt-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.