Precision resistor testing
I’ve built a little box with two 10kohm precision resistor assemblies, using Fluke resistors — one ass’y is two 20k managing wire on shellacked mica cards in parallel, and the other is made of eight 5k wire wounds in sealed green plastic cases in series/parallel. These are not exactly 10k ohms each, but are about 30ppm (high) for the mica card, and 20ppm (low) for the green plastics, according to my HP 3458A.
I would like to get them accurately characterized, but never having done this, I don’t know who to have do it or how much it would cost. Any ideas or suggestions? They can be shipped anywhere cheaply as the box is small, light, and very durable.
TIA
Andreas has a good thread on EEVblog
http://www.eevblog.com/forum/projects/t-c-measurements-on-precision-resistors/
I am guessing that you want to calculate the alpha and beta coefficients
over a certain temperature range? I am also interested in doing something
similar, having collected different bits of gear. I already have the
modified box and peltier controller. The temperature chamber will be
similar to what Joe Geller used for his references.
http://www.gellerlabs.com/SVR_TempcoTest.htm
I do not know of any company or person that offers this service. It would
certainly make a good volt-nut project.
Todd
On Fri, Nov 14, 2014 at 5:36 PM, Richard Moore richiem5683@gmail.com
wrote:
I’ve built a little box with two 10kohm precision resistor assemblies,
using Fluke resistors — one ass’y is two 20k managing wire on shellacked
mica cards in parallel, and the other is made of eight 5k wire wounds in
sealed green plastic cases in series/parallel. These are not exactly 10k
ohms each, but are about 30ppm (high) for the mica card, and 20ppm (low)
for the green plastics, according to my HP 3458A.
I would like to get them accurately characterized, but never having done
this, I don’t know who to have do it or how much it would cost. Any ideas
or suggestions? They can be shipped anywhere cheaply as the box is small,
light, and very durable.
TIA
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Hi Dick,
I have a small temperature chamber and can create plots characterizing the resistor like the one attached.
Best regards,
mitch
-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@febo.com] On Behalf Of Richard Moore
Sent: Friday, November 14, 2014 5:36 PM
To: volt-nuts@febo.com
Subject: [volt-nuts] Precision resistor testing
I’ve built a little box with two 10kohm precision resistor assemblies, using Fluke resistors — one ass’y is two 20k managing wire on shellacked mica cards in parallel, and the other is made of eight 5k wire wounds in sealed green plastic cases in series/parallel. These are not exactly 10k ohms each, but are about 30ppm (high) for the mica card, and 20ppm (low) for the green plastics, according to my HP 3458A.
I would like to get them accurately characterized, but never having done this, I don’t know who to have do it or how much it would cost. Any ideas or suggestions? They can be shipped anywhere cheaply as the box is small, light, and very durable.
TIA
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and follow the instructions there.