[Test-Equipment] Dummy load

[Dennis L. Wade]

It may not be called "USP" in VK land, but I would expect that any 
mineral oil used as a laxative to be pure mineral oil.  Even in VK land.

John is of course correct in concept, that being...a *pure* mineral oil 
will be fine as a heat conductive medium in a dummy load.  Heathkit 
recommended it as an alternative to transformer oil in its dummy load kit.

Additives will cause problems as you point out.

            Dennis

Dennis Wade
KG6ZI
Carmichael, CA



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 of 
> which has any bearing on laxatives or pharmacopoeia. Please bear in mind that 
> this list is worldwide and that your favorite acronym is capable of multiple 
> misinterpretations.
> 
> A laxative is likely to form compounds with carborundum that wouldn't 
> enhance heat transmission properties. And it's unlikely to have a prescribed 
> dielectric coefficient - whereas, transformer oil does.
> 
> Let's not confuse cheap with effective, eh?
> 
> 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.
> 
> 
> 
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