I may have that nulling process A-about - I don't have mine sitting here
and its been a while. Whichever - it is the opposite way you'd do it
with other meters. I recall that for one of the modes I never use that
you null as per "normal" but for the others you null in reverse.
Cheers
Kim
On 13/8/20 7:23 am, Kim Frankcombe via SEGMIN wrote:
Jon
Negatives typically imply a conductive sample. If you are measuring
directly on core in metal core trays or even on non metallic core
trays lying on metal racks you can get negatives. I always lift the
core and measure it in the air.
The other trap for non manual reading beginners is that the SM30 nulls
in reverse to other instruments i.e normally you would null in air
then take a reading, with the SM30 on settings 1 and 6 you take a
reading then null. If you are doing it in reverse you will get
negative readings.
Cheers
Kim
On 13/8/20 1:43 am, Benoit Tournerie via SEGMIN wrote:
To follow up on Madjid comment,
See Table 2 on https://www.publish.csiro.au/pv/pdf/pvv2016n184p41
A comparison of magnetic susceptibility meters using samples from the
Thompson Nickel Belt, Canada
Deng Ngang Deng and Richard S Smith
-----
Benoît Tournerie, /P.Geo., D.Sc./
*From:*SEGMIN <[email protected]> *On Behalf Of
*Madjid Chemam via SEGMIN
*Sent:* Wednesday, August 12, 2020 13:24
*To:* [email protected]
*Cc:* Madjid Chemam <[email protected]>
*Subject:* Re: [SEGMIN] Mag Susc SM30 problems
Hi Jon,
You can see negative magnetic susceptibilities on massive pyrrhotite
samples due to diamagnetism.
Regards
image002
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*De :*SEGMIN <[email protected]
<mailto:[email protected]>> *De la part de* Jon
Woodhead via SEGMIN
*Envoyé :* August 12, 2020 12:42 PM
*À :* [email protected] <mailto:[email protected]>
*Cc :* [email protected] <mailto:[email protected]>
*Objet :* [SEGMIN] Mag Susc SM30 problems
Hi All,
Wondering if anyone has some advice for a client that seems to be
getting a large amount of _negative readings_ on the SM30 mag susc meter.
I simple case of user error or something (even) more serious?
Thanks
Jon
Jon Woodhead, PhD
JAW Consulting LLC
Golden, Colorado
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