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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I'm using a component tester to measure a resistor which I have removed from a circuit. The tester gives a reading of around 0.46 - 0.50 Ω. I have 7 other identical resistors (in circuit) and they all ...
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How can I describe the loading effect in an ohmmeter? I've been given an assignment with this question, and I tried to look it up on the internet but could find no other material apart from loading ...
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Inconsistent resistance measurement in H-bridge

I have an H-bridge circuit that is meant to measure the voltage across the shunt (330 resistor) and load (pictured as 4700, but variable) to calculate the resistance of the load (I have added the 10k ...
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255 views

How can I check continuity longer than my probes?

I'm trying to sleuth out a wrongly wired connection on a small injection molding machine. I'm starting by verifying the connections match the diagrams from the manufacturer. However, some of the ...
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Two ideal ohmmeters in parallel

So let's say I have a load with a resistance of 500 ohms and two ideal ohmmeters connected in parallel. And the question is, what will be the readings on those ohmmeters? This really confuses me, when ...
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Determining resistors in a Wheatstone Bridge from Ohmmeter readings - Unsolvable system of equations

I have been challenged in an assignment that uses a Wheatstone bridge to find values for the resistances in each arm, given that they are 1 kOhm +- 1%, and using only Ohmmeter readings and short-...
881 views

Wood moisture meter with a multimeter

I bought some firewood, but I do not think it is dry enough. I read a few articles about 18% - 20% moisture level, and I wanted to measure it, out of curiosity. I was about to buy an electronic ...
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258 views

Feedthrough capacitor measured with an ohmmeter

I'm trying to fix a Motorola 8 track player model Quadraline TM912, and I came across this component which was new to me, the so called feedthrough capacitor. On the image above, if the fuse E6 is not ...
92 views

Is there a manufacturer that produces an analog ohmmeter specifically for [closed]

Does anyone know of a manufacturer that produces a specific type of analog ohmmeter for testing the automotive relays equipped with silicon diodes ? I have heard that it is a newer type and has an ...
260 views

How to determine type of a BJT by using an ohmmeter?

Our lecturer in Analog Electronic class mentioned about determining the type of a BJT (whether it is PNP or NPN) by an ohmmeter. I know that in some applications we can determine the type by the ...
82 views

Efficient Switching of I/O

Reaching out as I am in the initial stages (read: crude block diagram) of circuit design for a project aiming to automate resistance checks between various connectors. We'll call these connections A ...
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Digital multimeter is reading erratic resistance ohm values

I have not come across this issue before in searches on this forum and searches on Google. I wonder if anyone else has come across it. My digital multimeter is unable to measure ohms. I'm just trying ...
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Why does my ohm meter briefly display a very large resistance before slowly increasing to OL?

I have 3 single conductor wires running from my house out to my barn. They have never been used for anything. When I measure the resistance across the ends of the 3 wires I would expect them to all ...
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Trouble understanding why multimeter gives different resistance readings

I want to preface this by I am a hobby electronics guy with some experience from reading The Art of Electronics. I know how to use a multimeter but I am very confused at what I am seeing. I am using a ...
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Measuring resistance with ohmmeter over resistor and capacitor in parallel

In "Teach Yourself Electricity and Electronics, 6th Ed." [Gibilisco] (2016) a test question reads as follows: A DC ohmmeter will give us a correct reading for a component in isolation (not ...
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Reading of megohm during ground check

During the check of pins on connector with a multi-meter, one of the pins that goes through the relay to provide ground signal, I am getting 8MOhm (8 megohm). I should not be getting anything on that ...
186 views

My ohmmeters don't behave as the book "make: electronics" describe

Here's the (low end) devices I own. One is an HoldPeak HP-90EPC, the other is an GBC KDM-110 I am following the book "Make: Electronics" by Charles Platt and I am at the very beginnings, where it ...
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Is this transformer working?

I found this transformer and I am not sure if it is working. I am confused with the multimeter readings. For example: when I am using the buzzer option to check the connectivity it buzzes when I ...
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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 ...
202 views

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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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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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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