Re: Testing Triac. Terms

On Thu, 7 Apr 2005 15:38:17 -0500, "Chretien" <Cretian@xxxxxxx> wrote:


>Its unfortunate that the meter people cant get together.
>I checked with one of my other meters and when I put a 15k R on it and set
>it for 200. It just does not change at all stays at "1 ." which is what it
>stays at when there is nothing on it. I wonder what it would take the
>manufacturers to start with a - dash lets say when the meter is on but not
>measuring resistance. And then when out of range say something else like
>+++.

Unfortunately, meters can't tell the difference between a resistance a
little more than full-scale, and open circuit, so your display of
"1 ." just means "the resistance between the test leads is more than
I can measure on this range".

>Frankly I find my original meter the bigger of the two with fancier
>options confusing when it also displays "1 ." for no resistance and 0.00
>for out of range. Normally when I think there is a dead short i use the
>diode/Beeper setting. Frankly it is a little disconcerting that out of
>range gives an output of 0.00 but I wonder if it is actually producing an
>output but that there are not enough digits on the display to show it ??.
>Anyway I'm sort of smart enough to know what I expect to get and so if I
>think its a short rather than an over limit I test it with the diode/Beeper
>setting.

I am certain that the reading of "0.00" indicates a low resistance -
too low to show any digits on the display. For example, if you set a
three-digit meter for 2K full scale, it will be unable to display a
resistance under 10 ohms, so would show "0.00" for any resistance
below 10 ohms.


--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
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