Products > Test Equipment

Multimeters With Low Ohms Function

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Per Hansson:
Should not the name of the thread (and any future video) include the word power or compliance voltage?
As I read it now it sounds like a meter that can show low resistances, like a 4-wire measurement or the dedicated low ohms mode of the Fluke 289?

Fungus:

--- Quote from: Neutrion on January 16, 2022, 01:04:10 pm ---Dave, if you do a video about it, might would be nice to see on the scope, how the different meters clamp back the voltage and how fast. Some people defend the 7V of the 87V with the claim that it would be clamped back fast. Now It would be interesting to see, if it could cause a problem in any arrangement.

--- End quote ---

Yep. These are current sources so measuring the voltage into a high impedance doesn't tell us much.

I assume the clamping will happen at the speed of analog electronics (ie. sub-microsecond) but it would be good to test this.

kripton2035:

--- Quote from: Neutrion on January 16, 2022, 01:32:20 pm ---If the beeping function is as fast as on the Brymen, you can just start to probe around any circuit for shorts, to see wether you get any short false beeps where there are no shorts. But again, this only happens if the beeper function is fast enough. But if you did not design your circuit to avoid it, it would be a wonder if it would work.

--- End quote ---
the bip on the shorty has an audio tone proportionnal to the value of the short. so if there is a charging capacitor, the tone is changing, and you can hear it.

AVGresponding:

--- Quote from: gamalot on January 16, 2022, 01:39:51 pm ---I just did a simple test on my Kyoritsu KEW1021R. Its open-loop voltage is about 3V (the voltage of two AA batteries), the voltage drop across a 10M resistor is 180mV, and the voltage drop across a 1K resistor is 95mV. The smaller the resistor, the lower the voltage drop.  :-DMM

--- End quote ---

This is because meters use a constant current source, and measure the voltage across the resistor under test to derive its resistance.

AVGresponding:
Ok the tests took less time than I thought, so here are the results.

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