Am I testing continuity correctly?

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MCH-108 Digital Multimeter

The MCH-108 Digital Multimeter is sold by iFixit.

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jatur @jatur6343

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发帖于: 2024年2月23日

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Am I testing continuity correctly?

I recently bought a ifixit multimeter and I tested it out to see if it was working properly. I tried out the different modes and they worked until i tried out continuity. I took a battery that i knew was charged and tried to test it out my multimeter. I turned continuity testing mode on and touched both probes together to see if it would beep and it did. I then took the red probe and held it on positive terminal and put the black probe on negative but the multimeter didnt beep. I was very confused. I then got the idea to put the red probe on the negative terminal and the black probe on the positive terminal and guess what, it beeped.

My question is when testing continuity in a battery am i supposed to put red probe to positive and black probe to negative or am i supposed to do red probe to negative and black probe to positive.

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@jatur6343 think about this for a second. If you have continuity between the + and the - connections, what do you get? A short circuit, right. You would measure continuity on something like a fuse or a switch, with the power off. A fuse would need to give you continuity,if it does not it has blown and thus does not show continuity. A switch shows you continuity if it is turned on, none if it is off. Always make sure that the circuit is unpowered. Like my esteemed colleague already mentioned, you do not measure continuity on a live circuit across the voltage rails. That is a sure fire wire to either damage your meter and/or damage the circuit.

由 oldturkey03 完成的 2024年2月25日

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@jatur6343 think about this for a second. If you have continuity between the + and the - connections, what do you get? A short circuit, right. You would measure continuity on something like a fuse or a switch, with the power off. A fuse would need to give you continuity,if it does not it has blown and thus does not show continuity. A switch shows you continuity if it is turned on, none if it is off. Always make sure that the circuit is unpowered. Like my esteemed colleague already mentioned, you do not measure continuity on a live circuit across the voltage rails. That is a sure fire wire to either damage your meter and/or damage the circuit. — oldturkey03

jayeff @jayeff 声誉积分: 449.3千 11 366 1.4千 · Answer 1 · 2024-02-23T23:33:58-07:00

Hi @jatur6343.

No you are not using the meter correctly.

You should never connect the meter to a circuit that has a power supply connected when testing for continuity or resistance as you can either damage the meter or you'll get an incorrect measurement i.e. don't connect the meter to a battery when the meter is in Resistance test mode (Ohms function test).

Continuity testing is not a voltage test.

If you want to check the battery's voltage, select the appropriate DC Volts range on the meter. If you don't know the voltage, start on the highest DC Volts range first and then scale down to get a more accurate measurement. If you then put the red lead on the +ve of the battery and the black lead on the -ve of the battery you will get a voltage reading. If you reverse the leads then you will get the same voltage reading with a -ve symbol in front of it showing you that you have the leads reversed. This is useful if you don't know which is the +ve and -ve sides of the battery, as the meter will show you.

I suggest that you familiarize yourself with the meter's user manual to know how to use the meter correctly.

For continuity or resistance /diode testing see Section 2-3-8. Resistance (Ω) on p.13/17 of the manual

MCH-108 Digital Multimeter

Am I testing continuity correctly?

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