Rudy,
Long time since we traded e-mails.
Nope, SIR is surface insulation resistance and it is measured in ohms.
This is where you have an interdigitated (love that word) comb pattern
where one set of combs will have, say, a 48 V bias and the other set
will be at ground.
The measurements are taken with a switching ohm meter.
Regards,
Bev
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: May 4, 2005 11:22 AM
To: [log in to unmask]
Subject: Re: [TN] Calibration of SIR equipment
Bev:
At risk of exposing my ignorance, an event I should be getting used to
by now...
Doesn't SIR equipment "read-out" in milligrams of Sodium Chloride?
If so, it occurs that you could do your own calibrating by simply
putting in fresh test solution, and then adding your own carefully
measured Sodium Chloride.. and seeing what they read?
You might even be able to get some unwitting chemical vendor, like one
of those in California, to make you up a standard solution of Sodium
Chloride, so you simply add a known volume to your test juice.
Or am I confused on the SIR function?
Rudy Sedlak
RD Chemical Company
Bev Christian <[log in to unmask]> wrote:
TechNetters,
Back from the dead!
Do any of you know where I can get SIR equipment calibrated?
I have six SIRometers and Cookson/Speciality Coating Systems no longer
support them! I also have one set of equipment built up from several
pieces of individual Keithley equipment.
Also, does anyone know where I can buy a set of NIST-traceable high
value resistors (E6 - E12)?
Thanks.
Bev Christian
Research In Motion
519-888-7465 x 2468
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