In article ,
says...

I prefer a Fluke anyway. This is why:
When measuring resistances in a cabinet with a running Variable
Frequency Drive I got nothing but house numbers with the feature
rich no-name-multimeter, that I was using by then. When using
a Fluke I got correct readings. The reason: The cheap MM was
sensitive to the RFI, which the VFD generated - the Fluke was
undisturbed by the massive RFI. That was the model 77 which
is old now. But you may find a used one as a bargain.
If you want to measure with strong RF-fields present then there
is a difference and you get what you pay for. TANSTAAFL.

On the other hand, I almost reached the point of insanity with a brand-
new Fluke 65 IR thermometer awhile back, trying to measure my car's
exhaust header temperatures with it. Every time I held it at the
(extremely awkward) position and orientation needed to aim the laser at
any of the exhaust ports, it would shut itself off.

The only thing that stopped me from sending it back to Circuit
Specialists for a refund was the fact that it would *only* shut off when
used under the hood of the car. I could never reproduce the problem
anywhere else around the house.

The problem turned out to be EMI from the Electromotive HPV aftermarket
ignition system. (After turning the ignition off, the thermometer
stopped shutting down.) Caveat mensor.

-- jm

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