[Test-Equipment] Dummy load

[Brian Clarke]

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.