You could do a simple test with a megger or a
high pot tester and some plastic pipe, inject
some current and see, through a couple of
metallic fittings. But it won't be calibrated
against any standard. At work I use Foxboro or
Barnstead resistivity meters, that read from a
few K ohm-cm to 18 Meg ohm-cm. That is as high as
it gets with DI water, with few ions. The Rf
systems I am responsibile for typically need 3-5
Meg Ohm-cm water minimum to prevent significant
leakage in the hoses.
John
>One of my businesses bottles and sell water in
>one gallon jugs under our own name. We also let
>customers refill 1 gallon jugs.
>
>We process our tap water with a reverse osmosis
>system. No complaints so far, although we do
>start with tap water that is right off the
>mountain and crystal clear. Some people feel
>guilty drinking tap water, so they are willing
>to pay out cash for the inconvenience of having
>it in a bottle. Profits from this "scam"
>support amplifiers.?
>
>Need to check the conductivity sometime. What
>is good and bad conductivity, and can I use an
>ohmmeter or do I need something special?
>
>Colin K7FM
>
>-----Original Message-----
>>From: Paul Christensen <w9ac@arrl.net>
>>Sent: Feb 6, 2007 9:12 AM
>>To: amps@contesting.com, "John T. M. Lyles" <jtml@lanl.gov>
>>Subject: Re: [Amps] WATER for vapor cooled amplifier TSPA
>>
>>> condensation process. However, I would wager to bet that the cheapest
>>> source would be used in bottled 'distilled' water for Walgreens
>>> retail, and that sometimes you are getting DI instead of distilled,
>>> hence the lower conductivity of the Zephyr hills brand. Call 'em up
>>> and see?
>>
>>John,
>>
>>That's probably the case. Perhaps what Zephyhills calls "distilled" goes
>>through a de-ionizing process.
>>
>>I've always wanted to know the difference between the various water types
>>sold on the grocery store shelves. At the moment, I can easily purchase
>>distilled or "purified water," but I've never been able to find what the
>>exact differences are. Probably a call into Zephyrhills is in order to know
>>for sure.
>>
>>Paul, W9AC
>>
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