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Questions tagged [ohmmeter]

An ohmmeter is an electronic device which measures resistance in an electronic component or circuit. It is composed of a ruled scale with an indicator needle or digital display, a range selector, and two probes.

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Autoranging Ohmmeter [on hold]

Note: before i explain my issue i would like to note that I am a beginner in electronics please pay attention to that when providing solutions and explanations. Thank you. I have succeeded at making ...
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Scaling up NTC measurement through Multi-Channel Ohm meter

For a test bed, we want to measure temperatures with NTC sensors (~10kOhm at RT) for the range 10°C to 70°C. Our test machine accepts auxiliary signal through CAN-bus, so we used a Raspberry with a "...
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Simple, low precision, milliohmmeter

Would like to have a simple milliohmeter for car wiring checking. Precision is not important, it's not about 3 vs 4 mΩ, it's about 3 vs 30 vs 300 mΩ. Simple idea is a 1A floating current source (2 ...
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Moisture Sensor Resistance

I have made a soil moisture sensor by taking two lines of Veroboard and soldering a wire to each line. The theory is that the resistance will change with the moisture - resistance dropping as the ...
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Shunt ohmmeter question

I have a question concerning this shunt ohmmeter: If we only want to use the \$R \times 1\$ gauge, we have the following circuit: I want to know what indication would appear on the ohmmeter if I ...
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Testing a Bipolar Junction Transistor using an analogue ohm-meter?

This video says I should see ohmmeter deflection with an NPN transistor, placing positive probe on the base, and negative probe on collector or emitter. A BC547 NPN is giving me opposite results - ...
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What might cause a fluctuating resistance of a generator winding?

Before assembly of a machine that contains a three phase generator I check the resistance between the 3 phases of the generator with an ohmmeter. The generator is kept stationary and the temperature ...
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Ohmmeter only gives a measure in one way

As far as I know, an ohmmeter works whatever the way you put the leads. However, when I'm trying to measure my resistance, I read 2Ω and if I switch the leads, I have 0Ω. I tried with 2 different ...
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How do I measure the error of my ohmmeter

I have to do an Ohmimetro to a college assignment, but I don't know how discover the measure error of my circuit. When we buy a multimeter, the equipment has a measure error calculated by the ...
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Can an inductive load mess up an ohmmeter's reading

I've found a something quite odd with measuring the resistance of a 36uH inductive load (see this earlier question). I can measure the resistance, which is quite low, but then disconnect the probe and ...
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Multimeter shows 50 M Ω between 9V battery terminals. Why so high?

I'm using my digital multimeter to measure the resistance between the terminals of a 9 volt battery i had lying around. Why does it read as 50 M Ω? Why is the resistance so high? I would think that ...
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Large resistance of diodes measured by ohmmeters

Many multimeters have a diode mode and I have always used this mode to measure diodes. Today, I happened upon a Fluke article that explains you can use the ohmmeter mode to measure diodes as well: ...
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Alternative to diode to allow uniform and predictable voltage drops or On resistance

I'm trying to design a relatively high accuracy auto ranging Ohmmeter. A typical Arduino example can be found here: http://www.circuitstoday.com/ohmmeter-using-arduino The problem with this design ...
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Low power ohmmeter

I need to monitor a variable resistor R1 (7.5 to 8k). The circuit runs from a coin battery. For now I'm using a voltage divider R1 and R2 = 10k, and it uses 3.3V from the battery. The middle points is ...
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How does an ohmmeter measure different resistances?

An ohmmeter has set of range settings for the resistances to be measured. When we switch to any range, what behavior of the test reference is being adjusted? In other words; I'm wondering if we ...