[Test-Equipment] Dummy load

[J. Forster]

Brian Clarke wrote:

> There are two problems, John. Firstly, 'mineral oil' is defined differently in
> different countries.Secondly, 'USP' has three meanings in my dictionary of
> acronyms, none ofwhich has any bearing on laxatives or pharmacopoeia.
>
> USP = United States Pharmacopia
>
> Please bear in mind that  this list is worldwide and that your favorite
> acronym is capable of multiplemisinterpretations.
>
> See here for alternate names:
>
> http://householdproducts.nlm.nih.gov/cgi-bin/household/brands?tbl=chem&id=126
> A laxative is likely to form compounds with carborundum that wouldn'tenhance
> heat transmission properties. And it's unlikely to have a prescribeddielectric
> coefficient - whereas, transformer oil does.
>
> It is chemically pure (ie made by fractional distillation) mineral oil. I very
> much doubt that the dielectric constant of mineral oil is controlled, since it
> is essentially a non-issue at 50 or  60 Hz where most oil filled transformers
> are used. Let's not confuse cheap with effective, eh?
>
> You are way off-base, and your comment is completely unfounded. It is a
> reccomended substitute for transformer oil by Heath among others. See:
>
> http://lists.contesting.com/archives/html/TenTec/1999-01/msg00234.html
>
> -John
>
>
>   73 de Brian, VK2GCE.
>
>      ----- Original Message -----
>      From: J. Forster
>      To: Brian Clarke
>      Cc: Rasputin Novgorod ; test-equipment at mailman.qth.net
>      Sent: Monday, February 07, 2005 4:06 PM
>      Subject: Re: [Test-Equipment] Dummy load
>       Pure mineral oil is available in drug stores and supermarkets. It
>      is sold for
>      medicinal purposes (laxative). Since it's USP, it's unlikely to
>      contain the
>      kinds of additives that motor oil and others may have.
>
>      -John
>
>      Brian Clarke wrote:
>
>      > Go easy on the mineral oil. Many mineral oils contain soaps
>      > and other compounds that are fine for the original purpose.
>      > But, mineral oils can form unusual compounds with the
>      > carborundum and change its resistive characteristics
>      > permanently. Better to stick with a product designed for the
>      > job.
>
>
>