The Trouble With Tone - DMM Continuity Test Mode Limitations
Ғылым және технология
Mitch uses a Fluke 117 and Klein mm1000 to demonstrate the features and limitations of using the tone setting on a multimeter.
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Another value that manufacturers do not usually show in their data is the voltage between the tips in diode mode, normally fluke has around 7V, klein uses 5V, but most generic multimeters use very little like 1.5 to 3V and that can be a problem measuring IGBT transistors as they do not have enough voltage to switch them.
@takingmeasure
11 ай бұрын
Thank you for sharing this comment. Even in DMMs constructed to accepted and adopted standards, the differences in underlying manufacturing parameters for each instrument can be problematic.
Great information
@takingmeasure
Жыл бұрын
Thank you for watching and commenting. I didn't understand the limitations of continuity test until someone showed me. I am suspect a lot of DMM users are unaware of this.
@williamsnipes7608
Жыл бұрын
@@takingmeasure I wasn't.
Just to show that it *was* a Fluke, Mitch misnamed it twice. Thanks, LockPickingLawyer!
@takingmeasure
11 ай бұрын
I sure did! Had a brain cramp there.
3:56 - What does it mean on the Fluke when it gives a pulsating tone in the continuity setting?
@takingmeasure
6 ай бұрын
If it does so while simply holding the probes together, the DMM may need servicing. If it does so while connected to a circuit, it could indicate intermittent continuity. You may want to see if the display is also giving a fluctuating ohm reading (if you are within the range of indication).
Continuity Mode doesn't measure the conductance value of various components or wire gauges plus most DVM meters give false readings when measuring below 2 ohms to milliohms. Example if you're measure Fan motor windings or compressor motor windings which are low ohms but various DVM meters will give false measurements because the range is not designed for low ohms. The DVM meter will measurement 2 ohms or 1.2 ohms for the compressor motor windings but is it really 2 ohms or 1.2 ohms? The DVM meters test voltage and test current might not be strong enough to get the correct measurement of certain motor windings that are designed that operate at a high voltage and high current.