Re: How many steps in a variac
- From: Palinurus <disscourn@xxxxxxxxxx>
- Date: Tue, 10 Feb 2009 05:51:18 -0600
John Larkin wrote:>
-
http://www.meinstrument.com/variac-transformer.htm
"SMOOTH AND LINEAR OUTPUT: As voltage between turns is small and as
the brush-arm is in constant contact with more than one turn, harmful
sparking is avoided and output voltage can be set very easily to a
fraction of a volt from zero onwards by rotation of the knob."
That's the idea, and it works, as long as it isn't pushed too far. We get certain devices in the shop for repair and recal in which the designer apparently expected the user to dial in a fraction of a volt. Even with a new variac (they tend to get sloppy with age)this requires a lot of back-and-forth and perhaps tapping on the knob to get an exact-enough value. Still, for what it's doing, it's difficult to imagine any other approach that wouldn't involve several times the cost and complexity and, most importantly for one of our customers, the ability to survive gross and prolonged abuse.
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