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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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2answers
1k views

Test a transistor with a multimeter

I used the guide at https://vetco.net/blog/test-a-transistor-with-a-multimeter/2017-05-04-12-25-37-07 to test a transistor with my DMM. The NPN transistor I used to test is the "mospec tip130 No11D" ...
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2answers
250 views

True value of skin resistance

When I googled about skin resistance I find people mentioning values as low as 500ohm but usually around 10-100kohm. When i measured the resistance of my own skin by putting the probes on the inner ...
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2answers
93 views

Please Critique my HV Measuring Setup

At the moment, I am working on a device that will be able to measure the out put of a high voltage DC power source with an adjustable output of 0 - -60 kVDC and 0-15 mA (the typical power being 600 ...
5
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3answers
631 views

High Voltage Measuring System

I am looking to set up a voltage-measuring system for the output of a recently purchased HV power source. The source supplies around 0 - -60 kV DC and 10 mA to my load. Unfortunately, the source does ...
3
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3answers
200 views

Tool for Measuring Low Current

I currently have a power supply that will be able to supply around -60 kV DC and 10 mA under the load that I will be hooking up to it. However, the internal resistance of the load will fluctuate and ...
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1answer
133 views

Did I ruin my multimeter with a current measurement?

I am trying to do a current measurement. Probably I accidentally put it it parallel instead of in series. What I tried before/after that (cannot remember exactly putting it parallel but might have ...
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2answers
91 views

Getting Rid of Annoying Buzzing Sound from Multimeter

my multimeter has been bugging me with this buzzing sound that turns on and off while I'm using it. I think it has something to do with its autoranging feature, but I couldn't find the manual for this ...
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3answers
92 views

How to know when to tune up a digital multimeter?

I have bought the multimeter with temperature measurement from the following website: http://futurlec.com/Multimeters.shtml Currently I use the voltage, resistance, and short circuit detection ...
2
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1answer
242 views

How to add a LED to a Multimeter for use it with the buzzer in continuity testing?

I want to add a notification LED to my digital multimeter which i need to glow with the multimeter`s inbuilt speaker (piezo/buzzer/beeper) while in Continuity testing mode. MM Model : DT830D If i ...
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1answer
1k views

Multimeter shows OL or 0.00 or 1.00. What's wrong?

I've got a UNI-T UT33D multimeter that's not working like I want it to, and I'm not sure how to find out what's wrong or if it's salvageable or not. The unit is new, but may possibly have had its ...
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0answers
79 views

Reverse Continuity Testing

I am interested in testing some low voltage cables for their quality. For example, USB, audio and Ethernet cables. Testing continuity is simple, but I want to know if these cables may momentarily ...
0
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1answer
201 views

How to test 3528 smd LED

Using my DMM and the diode selector, the SMDs 3528 in a brand new Led bulb does not light. I used this method to test the classic "round" leds but in this case it does not work. What seems to be wrong ...
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1answer
96 views

Am I using my multimeter correctly to measure current?

I've wired up a simple circuit using: 9V Battery Blue LED 220 Ohm Resistor I was expecting a much higher value of mA? Is it true it's only 0.8mA? Shouldn't the LED light up, since we're closing the ...
0
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1answer
63 views

Is it possible to “intercept” a 20-pin FFC?

I'm not an electrical engineer but a software developer but I'm trying my hand at a DIY project that will involve connecting a couple of pins on a device in my home to the GPIO pins of a Raspberry Pi, ...
0
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1answer
68 views

Ammeter for 24V power that can be read by a Raspberry Pi?

I have a project I'm trying to design and build that involves a "more accurate/useful" battery gauge for an electric scooter. The scooter runs on 24V off of two AGM cells in series. The details of the ...
1
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1answer
94 views

Measuring 200 volts safely

While I can measure line voltage safely, I need to write a procedure to have someone else measure the voltage. The load is pure resistive,and I want to measure the voltage across it, with a battery ...
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0answers
167 views

Multimeter shows too low voltage readings but everything else is mostly fine

I'm only asking if someone knows what might be the cause of my multimeter being broken. It is called DT-830LN. What's not working properly: The voltage reading is way too low, a 3.3V lithium battery ...
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1answer
73 views

Measured amperage differs greatly from my math

I've got the following circuit: simulate this circuit – Schematic created using CircuitLab It works. The LED glows nice and bright. However my math doesn't match the readings I'm getting from ...
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2answers
122 views

Measuring wattage to PoE device - how to hook up a multimeter inline?

I'd like to measure the amount of power drawn by a PoE client device (PD) and would like to hook up a multimeter inline to do so. However, power is supplied to the PoE device over two pairs of wires (...
3
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1answer
2k views

Using a multimeter, can I tell if a lithium-ion battery pack is brand-new?

A few years ago, I ordered a replacement cell phone battery from Amazon, and while it worked, it didn't last as long as I expected. I wondered if the seller had scammed me by selling me a battery that ...
0
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4answers
133 views

What is the recommended battery chemistry for digital multimeters?

I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter. If so, then what would the optimal battery ...
0
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2answers
1k views

Manually test computer Ethernet port with a multimeter

I have updated the drivers for the ethernet port an a laptop at home, yet it is only letting 10 mbps through for every cable that is connected, even though Speed/Duplex was set to Dual 1 Gb. I now ...
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0answers
96 views

Logic analyzer not shown signal

Good day. I am trying measure signal on ISO 9141 K-line - bidirectional serial link using logic analyzer. The device is Atmega based device with L9637 K-line driver chip. Problem is that, no signal ...
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5answers
168 views

Measuring Current Using A Resistor?

Sometimes in videos made by the YouTube creator ElectroBOOM the creator says he is using a 1 ohm series resistor to measure current. I looked it up and found some links to forums where people are ...
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2answers
75 views

Understanding the resistance readings between PCB connectors

Based on a question I asked earlier today, I am trying to verify that there's not short caused by my bad soldering. Luckily I had bought two of these modules. To make a baseline, I started looking ...
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0answers
30 views

Waveform monitoring on PC

I'm searching for a simple multimeter / oscilloscope simulation on Windows/Linux, which has the ability to import txt. or csv. datafiles and generate a video of an alternating voltage. I've been ...
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1answer
101 views

How do multimeters measure capacitance of polarized capacitors?

On my multimeter it doesnt matter in which polarity I put polarized capacitor. How is it made? If it is just simple rc circuit that measures charging time, how does it not damage capacitor in ...
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2answers
91 views

Using a lower voltage for a replacement fuse

I need to replace a blown fuse in my Tacklife DM02A multimeter. It says on the back of the multimeter that the blown fuse is F1 250mA 600VAC. Its size is 5mm x 20mm and it has to fit into a clip ...
3
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1answer
160 views

Is my multimeter broken?

First, let me say that I'm very new to electronics so this issue may just be down to me doing something wrong. Here is my multimeter: It started when I was trying to test the gain of a PNP ...
1
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3answers
536 views

Can some clamp meters measure voltage through their clamp?

A simple question, is it possible any clamp meters to provide voltage readings when a cable is between their clamp? I see from specifications for meters that they don't seem to do that and instead ...
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2answers
28 views

Figuring out if an led strip/matrix has a short or not with a multimeter

I am relatively new to electrical work, mostly stay on the software side of things. I recently soldered header pins onto a few led matrixes I have. They are 3 wire leds (power, data, ground). I'm ...
0
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2answers
111 views

Multimeter “false” measurement in car

Given my mom's car, I measured a voltage in an electric connector equal to the voltage across the car's battery. This is when the multimeter is connected to the connector supply pins. If I take the ...
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2answers
79 views

Why do I read resistance on the continuity setting but not on the resistance setting?

Disclaimer: Newbe A multimeter tutorial on Youtube said that to test my washing machine inlet valve solenoid for continuity I can use either the lowest ohms setting (200 on my DT830B) or the ...
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4answers
1k views

Is there any advantage to have a dedicated hole to measure milliamperes on a multimeter?

I have noticed that high-end multimeters usually have four holes: Common (COM) Volts (V) Milliamperes (mA) Amperes (A) While cheaper ones usually have three holes only: Common (COM) Volts (V) / ...
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0answers
49 views

Continuity Testing

I have a fluke 381 and i was talking to another tech about testing voltage sensing fuses in a live Automatic Transfer Switch, the fuses are 2 Amp HRC type fuses and i made the comment that i have in ...
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2answers
69 views

How to measure resistance with a multimeter?

This may be a very simple question. In my lab guide (I am a freshman Electronic Engineering student), we are supposed to build and analyze a circuit on a breadboard. First, we need to select some ...
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1answer
96 views

How a multimeter can't measure currents in parallels? [closed]

Today, I put two resistors in parallels ( R1 = 1k Ohms and R2 = 10k Ohms). The voltage in is 13.63 V ( It's DC voltage). When I use a DMM to measure currents flow through R1 and R2, the result of each ...
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1answer
32 views

Measuring current consumption of evaluation board

I have an evaluation board and I wanted to measure the current consumed by this device. I usually power it off a USB port so I was thinking of getting one of these. There is a two pin jumper on the ...
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0answers
82 views

What does a multimeter read when you measure unstable DC-voltage [duplicate]

When I have a Fluke True-RMS multimeter. Does the meter measure DC-RMS voltage or the average voltage?
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2answers
219 views

DC current consumption with sense resistor, different measure on oscilloscope and multimeter

I'm doing low side current measurement over a 0.1ohm resistance. Load is a DC motor powered with 12V. Cable length between resitor and power supply ground ~60cm I get a voltage of : 75mV => 750mA ...
0
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1answer
59 views

How to determine which camera batteries will take the most photographs?

I recently bought a used digital camera, complete with 6 lithium-ion batteries. The batteries all have different date codes on them, but some of the older batteries seem to last longer than the ...
0
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0answers
46 views

On AC coupling DMM , does the DC part of the signal make a normal mode signal?

Suppose I want to measure the AC part of a signal using a AC coupling multimeter. Does the DC part of it (mean value) turn to be a normal mode signal?. Should a Normal mode be include in an error ...
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3answers
2k views

Using diode mode on my multimeter to debug circuits. A good idea?

I've seen a few YouTube videos where the presenter, who appears to be experienced in board repair of Apple (and presumably other) circuit boards recommends to use your multimeter in "diode mode" to ...
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0answers
54 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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0answers
153 views

How can I measure the power given to a USB WiFi adapter's antenna in dBm or mW?

I have an Alfa AWUS036ACH USB WiFi adapter, and would like to know how much power is being given to the antennas (in dBm or mW). The Amazon link to it is here: https://www.amazon.com/Long-Range-Dual-...
0
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1answer
71 views

Questions About My Solar Home System School Project

I have a battery, light bulbs, a solar charge controller, and a solar panel. The actual issue has come with me testing the solar panel. I have both a 30W and a 50W solar panel, so I am assuming the ...
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3answers
3k views

Is my multimeter fuse blown? [closed]

This is the only multimeter I have. I do not want to buy a new one to test one I already have. I know when a fuse is blown when the fuse is clear. This fuse is white. Not clear. My multimeter is not ...
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2answers
174 views

Good equipments to measure current consumption for IoT devices

I was asked to bought some equipment to measure the current consumption for the IoT devices. The company is a startup and has a limited budget for this (let's say less than 5k$). I'm looking for an ...
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2answers
82 views

Automated voltage measurement: Tradeoff between PLC and averages

I am setting up an automated voltage measurement of a precision device. In my case, I am using a Keithley 2000 and controlling it over RS232 from MATLAB. The voltages I am measuring have to be quite ...
2
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4answers
1k views

Multimeter, measuring current calculates less. Can I calculate meter's internal resistance this way?

I have set up the following circuit in order to measure current. simulate this circuit – Schematic created using CircuitLab Of course, Ohm's law tells me that I should get a measurement of ...