Flash!
I try it with a +/- 1% resistor.
Oops, only one contact point on the meter..can't get a change...not even
a wrong one.
Ode
At 04:04 PM 6/9/2003 -0400, you wrote:
Right On Buddy !!!!!!!!!
A precicly known resistive load should be ideal for calibration !!! Because
I live in Rhode Island, Hanna Instruments is a local call for me. I will
find out exactly what ohm & tolerance level of resistor to shunt across the
meter leads, and exactly where to obtain these given resistors... etc...
My guess is that a simple radio shack resistor will do, as long as the (+/-)
tolerance is able to produce a small PPM error zone...
Say @ 3-5 ppm, would be ok I think...
Regards,
Alexander
----- Original Message -----
From: "Ode Coyote" <coyote...@earthlink.net>
To: <silver-list@eskimo.com>
Sent: Saturday, June 07, 2003 10:08 AM
Subject: Re: CS>cheap ppm tester
> It would be interesting to know what was used as a benchmark.
> Apparently, some benches are of different heights and some look more like
> counters.
> I would trust a benchmark based on electrical conductivity of a known
> [solid?] substance rather than some dubious liquid solution.
> Typically a PPM meter will read half that of a microsiemens meter such
> as the PWT.
>
> Ode
>
> At 06:21 AM 6/7/2003 -0500, you wrote:
> >My TDS -1 reads from 0 to 999 not 0 to 2000 and it is calibrated to
> >measure homemade CS.
> >
> >Jim
> >>The TDS-1 from Hanna Instruments is a good bit cheaper, but it reads
> >>from 0 to 2000 ppm. You'll be using it at the *very* bottom of its
> >>range, which means the accuracy will not be tremendous. Sorta like
> >>measuring grains of sand with a yardstick. Do you see what I mean?
> >
> >
> >
> >
> >--
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>
>
