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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.

2
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1answer
169 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
648 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
71 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
113 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 ...
1
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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
55 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
57 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
91 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
110 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 ...
1
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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 ...
1
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1answer
84 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 (...
2
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1answer
1k 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
125 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
899 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 ...
0
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0answers
92 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 ...
0
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5answers
107 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 ...
0
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2answers
74 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 ...
0
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1answer
85 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 ...
1
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2answers
81 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
158 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
368 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 ...
0
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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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1answer
82 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 ...
0
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2answers
67 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
46 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
66 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
93 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 ...
0
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1answer
30 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 ...
0
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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?
0
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2answers
182 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
58 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
40 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 ...
4
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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 ...
0
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0answers
48 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
128 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
70 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
2k 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 ...
3
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0answers
129 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 ...
0
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2answers
72 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
votes
4answers
843 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 ...
9
votes
2answers
875 views

Bad Measuring Equipment?

I was measuring the current through current mirror, when I experienced a problem. But first, I want to mention that I measured this with two ammeters of same manufacturer and same model (Mustool MT826 ...
8
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4answers
2k views

Accuracy of a multimeter over 10 years period

Datasheets of multimeters contain accuracy specifications. One parameter is usually accuracy over period of 1 year. I understand that it means multimeter can be off by the specified value. For ...
1
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1answer
362 views

Checking continuity using multimeter

I have recently took MCU board and testing continuity across button. When board is not powered i.e; not executing code, continuity on button is as expected (i.e; diagonally opposite pins are not ...
0
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1answer
95 views

Tool for measuring Real and Reactive Power [closed]

I am currently doing a project where I need the Real power (P) and Reactive power(Q) measurement for a Refrigerator. I understand that if I can measure AC Voltage(V) and AC Current(A) for the ...
0
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2answers
74 views

What is the capacitance of this capacitor? [closed]

On the Uni-t UT61E there is a small smd capacitor on the front of the pcb (side with lcd display) labeled C36. What is the capacitance of this component? I do not have the component itself.
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3answers
1k views

How to read amps in a multimeter

I don't know how to read this? Is it 4.1A or 410 mA...? Thanks
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0answers
53 views

Using a larger fuse in my multimeter

I am trying to replace the burned out fuse in my multimeter. It is very small with dimensions of 3.6mm X 10.25mm and has a rating of 600mA @ 250V. I can't seem to find this fuse. I can find one with ...
0
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3answers
204 views

Do the temperature coefficients of the resistors in the LM399/LM199 “Portable Calibrator” significantly effect the output stability?

I'd like to know how voltage reference stability is obtained in products like 6.5 digit multimeters that use LM399 as a voltage reference in spite of using two gain resistors. Let's assume an ideal ...