piclist 2002\12\22\174440a >
Thread: Weight sensors
www.piclist.com/techref/io/sensors.htm?key=sensor
picon face BY : Spehro Pefhany email (remove spam text)



At 05:15 PM 12/22/02 -0500, you wrote:
>There are several manufacturers of load cells.  Here is one
>http://www.entran.com/ltoc.htm
>But there are others.  The real trick in application of load cells is the
>error budget.  To minimize drift, you need a highly stable excitation
>voltage.

"Stable" is about right, it does not have to be very accurate- you can get
16 or 18 bit accuracy with a 5% accurate excitation voltage.

>  In high precision you should apply a pulse and capture with a duty
>cycle such that the error introduced by self heating is eliminated.

And consider low-frequency swapping of polarity to remove unwanted
thermoelectric potentials.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spamBeGonespeff.....spamspamBeGoneinterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

--
http://www.piclist.com hint: To leave the PICList
RemoveMEpiclist-unsubscribe-requestspamBeGonespamKILLspammitvma.mit.edu>
<5.1.1.6.2.20021222174203.01fb5200@mail.interlog.com>

In reply to: <000e01c2aa07$97808330$6400a8c0@scientifx6ajal>
See also: www.piclist.com/techref/io/sensors.htm?key=sensor
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) Weight sensors

month overview.

new search...