My fluke 189 is that sensitive! You need quality tools or a mechanic with
quality tools.

"Aaron Coolidge" wrote in message
...
Jim Burns wrote:
: The pitot heat has failed on our Aztec. No heat, not even warm, no
amperage
: draw. Circuit breaker, switch, leads, and ground all check ok.

: Now here's the strange part. We get correct voltage across the leads
and we
: get continuity across the terminals on the tube. No continuity from the
: terminals to the tube itself, so I don't think the element is shorted
out
: against the tube.

If the Aztec is 12V, the resistance of the heater in the pitot tube should
be
between 0.75 and 1.2 Ohms. If it's greater than that the heater has failed
internally. (24V systems would be about twice that resistance, of course.)
The leads of most multimeters have 1 to 2 Ohms resistance, so checking
a low resistance is troublesome. I'd jumper the pitot tube heater to a 12V
battery and see if it sparks when connected or disconnected.
--
Aaron Coolidge