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Questions tagged [multimeter]

Single universal measurement device that can be used to measure voltage [V] and current [A] in both AC and DC, as well as resistance [Ω]. Often many other ranges are available like frequency [Hz], duty cycle [%], capacity [F], ... Most are hand held, some more expensive ones come as a bench model.

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5answers
3k views

Capacitor Gaining Voltage Over Time?

I recently bought two 3300uf 100v capacitors and have connected them in parallel. I charge them up to 100v and discharge them. I then hook up a multimeter and notice the voltage going up very slowly, ...
0
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0answers
46 views

Should I get a multimeter to check size of voltage to avoid damaging a logic analyser?

I am looking into getting a Saleae logic analyser for a project to reverse engineer an electronic display and buttons for use with a RaspberryPi. I think it should be OK as I would doubt, by my own ...
0
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1answer
89 views

Ground loop current for voltmeter

I am trying to build a voltmeter, but the voltmeter is powered by a 12V dc adapter. My concern is if the ground potentials between the analog input source and the voltmeter are different (e.g. due to ...
0
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1answer
75 views

How can I find out a components voltage rating and amperage draw?

I bought a whole bunch of components for mounting on a circuit board (I'm new to electronics and I'm just experimenting at the moment) - things like LED's, small microphones, buzzers, very small ...
0
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1answer
79 views

Current decrease in a lamp due to the change in scale of an analog ammeter

I do not understand what happens in the following situation regarding internal resistance of an analog ammeter. The internal resistance of analog ammeter changes if the scale is changed. For example ...
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0answers
1k views

Why are readings from multimeter leads are too high?

One of the multimeters I have is a cheap Craftsman 82140 65EA. Today I was using it and it was giving wildly high readings for everything. A battery that measured around 9V on a working multimeter ...
0
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1answer
5k views

How to check if IR receiver is dead or not ?

I have an IR Receiver , but I am not sure if it works or not, I want to make sure weather it's burnt or not, How can I test this with Multi meter ? If it can not be tested with multi-meter, Is ...
0
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2answers
89 views

How to measure current on an electrolytic etcher

I'm building a simple electrolytic etcher to mark steel parts. The set up is a 12v DC 5 amp power supply with the ground connected to on side of the steel part and the positive connected to a brass ...
0
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1answer
296 views

Relation between internal resistance and chosen scale on analog/digital voltmeter/ammeter

On Introductory Circuit Analysis of Boylestad I found out the following about the relation of internal resistance of a multimeter with the scale choosen on the instrument. Analog voltmeter: internal ...
0
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1answer
87 views

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 ...
3
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3answers
185 views

Does a DMM alter the real value of current flow, when measuring current?

I am working on a project right now, that utilises the low-power mode of the ATmega328-P. This essentially sleeps the micro-controller when it is not in use. I have a Fluke 79 series ii DMM, which is ...
0
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2answers
379 views

Reading the Amperage of a DC Current Source using a Multimeter

Hello everyone this question is probably basic but i am having problems with a current source that i am trying to test: So if memory doesn't fail me you connect the black connector to ground and the ...
0
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1answer
292 views

How do I work out the pin configuration of this crossfader with a multimeter?

I got this crossfader out of an old DJ mixer. I want to use it in an electronics project of my own design. It's got 4 pins - which I presume are 2 x input, 1 x output and 1 x ground. Using my Fluke ...
0
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1answer
390 views

Clamp Meter is not working [closed]

when selecting continuity test, starts continuous beeping sound even with test leads removed. Also there is battery sign on display and no zero when it turns on. I used it to check voltage of ...
1
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2answers
195 views

What is the purpose of everything to the right of the proton exchange membrane in a microbial fuel cell?

A standard microbial fuel cell looks like: And my question is, why is the cathode and bascially the entire right chamber necessary for electricity production if the load (or the multimeter) can be ...
0
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1answer
69 views

Finding battery capacity

So since I do not have a battery balance thing yet I have been working, starting yesterday, on some li-ion cells because I need to find capacity of the cells. And I have a few questions to make sure I ...
2
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2answers
1k views

How to measure charging current for TP4056 module?

TP4056 module is connected to usb port on my PC resistor is default 1.2k... When I put multimetar on output of module I get about 120-130 mA... I am not sure why is that, should I get 1A? From ...
0
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2answers
295 views

LM334Z current source testing

So i have a constant current source , datasheet here: http://www.ti.com/lit/ds/symlink/lm134.pdf. My setup is this : 9 volt + side goes into V+ or the source , which in turn is connected to the R pin ...
0
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1answer
123 views

Used Fluke 87V multimeter working correctly?

I'm just a hobbyist but I like to purchase quality tools so I purchased an "only used once" Fluke 87V on eBay. The calibration sticker says the calibration expired last year. Anyways, when I turn on ...
0
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1answer
216 views

Why does the measured potential-difference between two poles of an AA fizzle out after 5 seconds?

I have some AA and AAA batteries that are sitting on my desk - I decided to test them before throwing them out. Some are Duracell "Duralock" brand, the others are Kendal "Super Heavy Duty - Pile ...
1
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1answer
334 views

Accidently read resistance on live wires

I have accidently taken readings of resistance on my digital multimeter on live mains and now the resistance function on my meter is not working. But i'm still able to use other functions in it. Is ...
1
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1answer
154 views

Can I use a multimeter to measure voltage even if amps of circuit is too high

I need to measure circuits which I expect to be 12V 19A and 5V 44A I've got a basic multi-meter which can handle 10A/ 240V Can I use this multi-meter to measure only the voltage on the circuits? As ...
5
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2answers
1k views

Why can't I get a resistance reading on my temperature probe?

I'm a complete beginner to electrical engineering, so I think I might be doing something stupid here. I have a set of grill temperature probes I ordered from Amazon. I am trying to find out the ...
1
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1answer
276 views

Is it possible that I fried an MCU pin by performing a continuity test

I have a microcontroller (dsPIC33EP64GS506, 64-pin, TQFP, link to its datasheet), which doesn't seem to work on 2 GPIO pins (pins 4:RC0 and ...
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1answer
475 views

What type of battery does a small gray Mastercraft Pocket Digital Multimeter (model 52-0051-4) require? [closed]

Canadian Tire is a retail chain which operates only in Canada. They're probably one of the biggest retailers of hardware and tools in the country. One of their store brands is Mastercraft. About ten ...
0
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1answer
93 views

Why does the current intensity decrease when I connect two voltage sources in series?

I actually connected lemons with batteries and I found that the voltage of lemon and the battery (i.e. the bottom left circuit) is 3.8V while the current intensity in the top left circuit is 0.1mA! ...
0
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2answers
974 views

How can I connect a CT clamp (AC Current sensor) to a multimeter?

I have ths CT clamp (with a 3.5 mm jack on the end): https://openenergymonitor.org/emon/buildingblocks/report-yhdc-sct-013-000-current-transformer How do I connect the clamp output to the multimeter ...
2
votes
4answers
337 views

How to Connect this Crocodile Clips to my Multimeter? [closed]

I got crocodile clips with my multimeter, but no cable with them. The tips of the probes I have, do not fit into the plug on the crocodile clips. How do I connect them to my multimeter? What kind of ...
2
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4answers
2k views

Multimeter precision on low battery

Recently I measured some voltages with my cheap digital multimeter while it was showing the low battery indicator. Later I purchased a replacement battery and decided to redo my measurements. I found ...
4
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2answers
2k views

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: ...
0
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1answer
113 views

Can a digital meter be damaged when reading resistance but connected to AC voltage

While testing with multimeter like a fluke 177 or fluke 334 clam meter in ohms range, if it is connect to ac voltage up to 50 volts, does it damage the multimeter?
3
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2answers
2k views

why does my voltage regulator produce 5.11 volts instead of 5?

I'm not sure if my multimeter is at fault here, but I made a partial circuit in which I soldered in a voltage regulator (7805CT) and hooked a 22uF capacitor at the input and output (I connected the ...
1
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3answers
312 views

A way to make temporary connections to battery holders?

I often need to make connections to these types of battery holders. For example, to power it from an external power supply, and/or to measure current draw in various modes of operation. I can use my ...
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2answers
1k views

What is ADP in multimeter? [closed]

What is the ADP option/range in digital multimeter? I try to find detail in google. but, I couldn't find any simple description. Explain usage and function of this ADP.
0
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2answers
121 views

multi-meter current reading dropoff

I wanted to check the power consumption of my LED bike lights, so i connected my multi-meter up and switched the light on. Initially the current was 1.2A, but over the next 15 mins or so the reading ...
1
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1answer
511 views

Can a DMM continuity probe fry an IC?

I just finished soldering a QFN package to a breakout board, and was about to go at it with my multimeter in continuity testing mode to check for bridges, when it occurred to me that some ...
2
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3answers
5k views

Is it safe to measure AAA battery current with a multimeter directly? [duplicate]

Just bought a consumer grade multimeter, read carefully the instructions and tried some things. I know some very basic things about electricity, but I am unsure whether what I did was safe and didn't ...
0
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1answer
117 views

Suspicious Continuity Test Result [closed]

# Paraphrased Question When testing for continuity on an old circuit board from a usb powered desktop speaker, i find that the ground is connected to almost all other points including to each feet (...
0
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2answers
110 views

Why does my multimeter show a higher current with lower sensitivity when measuring AC current?

For measuring AC current my multimeter has the options: I just wanted to measure an AC current which I expect to be around 1A. Here are the two measurements I did: What I always thought was that ...
0
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2answers
317 views

Why are multimeters much more sensitive than oscilloscopes?

I have a circuit where I have to measure tens of uA of currents. When measuring it with a 50Eur multimeter, the multimeter shows the currents with acceptable accuracy and so far no significant ...
0
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1answer
426 views

What do the settings on a multimeter mean?

I wanted to measure the resistance in ohms of an apple, so I plugged my digital multimeter into either end of the apple and adjusted the settings up to 200k and it gave me a reading of about 68. ...
1
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0answers
38 views

Transformer, and Resistance Probelm

Is it possible to test the pins of a transformer using the resistance part of the multi-meter? I was testing a 6 pin transformer, and resistances measured 4.1 Ohms between two pins connected to a ...
1
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2answers
380 views

Resistance measurement across reversed batteries using multimeter

If you take two similar capacity batteries and put them in contact in a reversed configuration (anode-anode or cathode-cathode) in series, the resistance measured by a digital multimeter across the ...
3
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4answers
1k views

What is the 1000V - 200mV AC range for on my multi meter?

This question draws upon elements of using a DVM for AC. My multi meter has a 1000V - 200mV AC range. Since there seems to be a consensus that multi meters can only reliably read 50Hz AC wave forms, ...
0
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2answers
208 views

Micro controller to set 'dial knob' mode on multimeter [closed]

Can a microcontoller be used to replace the "dial knob" function in a 'off the shelf' multimeter(10A max AC/DC). Is it easy to scale and micro control multiple identical multimeters using one ...
1
vote
2answers
195 views

DMM: auto-ranging and capturing transient current waveforms

This might be a follow-up/related question to the one previously asked on StackExchange here. My question is: in an auto-ranging DMM, would I be able to capture transient current profiles - for ...
0
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2answers
412 views

Reading a number of voltage samples with Fluke 8845A

This question is for anyone familiar with Fluke's 884XA-series meters. I am looking to measure voltages with the Fluke 8845A meter. What I would like to do is measure a specified number of samples at ...
0
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1answer
1k views

Is this the correct setting to measure the vref voltage to adjust a trimpot on my A4988 stepper driver?

I'm trying to adjust the voltage on a trimpot measuring it using a multimeter. I found a video in which they appear to be doing this (not on RAMPs), and the multimeter is set to the third symbol ...
0
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1answer
126 views

unloading capacitor while measuring voltage with multimeter

I have load a 10nF capacitor with a bigger capacitor of 100 uF. Both have the same voltage but when I measure the voltage of my small capacitor I unload it to zero... How can I avoid this effect ? Is ...
1
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1answer
102 views

why do i measure a potential difference when I put my two electrodes in a water bottle?

I have a multimeter adjusted in DC tension mode. When I put my two wire connections inside a water container, I measure +120 mV or sometthing less but never zero. Why do I measure a potential ...