Questions tagged [multimeter]

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14
votes
2answers
2k views

Diagnosing appliance that shocked me

I have a portable air compressor (Master Airbrush MAS TC-40T) I use frequently, usually for airbrush painting. Normally the compressor sits on a counter, and I do not touch it while it's running ...
9
votes
3answers
6k views

Analog multimeter won't calibrate to zero

I have a multimeter that I haven't used in many years. I wanted to recalibrate it, so I touched the two probes and tried to adjust the reading to zero, but 500 ohms was as low as it would go. Is the ...
5
votes
3answers
2k views

Which terminal to use on my multimeter

I have read the manual for my new multimeter but unsure which (red) terminal to use for what. The meter has one VΩmA fused 500 mA max terminal and one Unfused 10A Max terminal. I just want to measure ...
4
votes
2answers
12k views

How can I test a three-way switch to determine if it's working?

I have a light fixture in my house that suddenly stopped working. I tried replacing the lightbulb and still non luck so I decided to try and see if it was the three way light switch itself using a ...
3
votes
4answers
16k views

What happens if I use the DC Voltage setting on an AC line? What about the reverse?

I have a run of those low voltage lighting systems in the hallway. The kind that have a two parallel exposed wires, with fixtures that clamp on in various spots on the wires and then take an MR16 bulb....
3
votes
1answer
2k views

DIY AC Line Splitter

As a fresh DIY-er (just moved into my own house), I've purchased a digital clamp multimeter. Learned the hard way that in order to utilize the clamp to measure current, the supply line needs to be ...
2
votes
2answers
2k views

Troubleshooting Clamp Meter

I have a Mastech digital clamp meter and I can't for the life of me get it to display any reading other than 0. I was wondering if there are any tricks I'm simply not aware of? Here is what I have ...
2
votes
2answers
285 views

How to verify that resistive load thermostat is dead

I have an electric heater, connected to a resistive load thermostat (240V). Yesterday we found the thermostat apparently totally dead (display off, etc). I've checked the breaker, of course. (There is ...
2
votes
1answer
100 views

Hot to Neutral at the outlet only reading 112V

I am trying to troubleshoot an issue. All outlets downstream from my GFCI will not work when I plug anything in. with my DMM I pulled the GFCI from the wall and measured voltage into the GFCI from ...
2
votes
1answer
50 views

Test Thermostat with Multimeter without 'C' Wire

I'm hoping to replace my thermostat with an Arduino-powered one of my own. The furnace is a Trane XV90 Upflow 2-stage condensing gas-fired one with upgraded inducer motor using Trane Furnace Kit ...
2
votes
1answer
312 views

Can NCV tester show presence of Knob & Tube wiring?

I live in a century house whose electrical was last worked on in the 1960s at the latest. Without opening a wall, I’d like to make some deductions about the odds of having in-service knob and tube ...
2
votes
1answer
130 views

How to make a panel mounted voltmeter/ammeter in my main panel up to code?

I have already submitted a permit for and received approval to add a 50 amp inlet to my home for a portable generator. It will be 4-4-4-6 to an interlocked 50 amp breaker on my main panel. I'd like to ...
2
votes
0answers
339 views

Why do I measure 12VAC on old thermostat wires?

I'm installing a nest thermostat in my house - it's the UK version with a heatlink. I have successfully wired the heat link into my combi-boiler, disconnecting two existing wires in the process. I ...
1
vote
2answers
358 views

Can I check the wattage / amps of a pair of light fixtures using a multimeter

I need to test the wattage / amps of two light fixtures on a single circuit. I'm having issues with a smart dimmer and I'm trying to figure out if the amps / wattage exceeds the limits of the dimmer. ...
1
vote
3answers
58 views

Why do different meters show different voltages between hot and ground?

I am measuring voltage between hot and ground wires on a light box. Why does one voltmeter show 4 volts. And another shows 0 volts? How many volts should there be between these two wires?
1
vote
2answers
205 views

How can I measure the voltage of 40A transformer?

I need to power 10 meters of 5V LED strip, for which I bought a 40A transformer on AliExpress. Now, as much as I believe that cheap stuff bought from China can be okay quality, I'd like to make sure ...
1
vote
1answer
56 views

86 volts between neutral and the electrical box?

Context: I'm swapping out a dual electrical outlet in my kitchen with a combination switch/electrical outlet. I want the switch to control two small LED lights in adding to the room and the outlet to ...
1
vote
1answer
270 views

Receptacle upstream from GFCI with an issue causing GFCI to trip?

I'm not sure what to do next, and I'm fairly inexperienced with troubleshooting home electrical issues. My investigation started with the GFCI receptacle on the kitchen counter receptacles tripping ...
0
votes
4answers
191 views

Clamp DC current measurements with AmazonCommercial 600A AC/DC Clamp Meter

Please see the UPDATE section below! The question still stands (with new info). I don't feel the need to open a new one, but let me know if you think otherwise. Is AmazonCommercial 600A AC/DC Clamp ...
0
votes
4answers
131 views

Can a multimeter be used to detect if an appliance's body has voltage on it?

I have installed a ceiling light myself (there is no ground wire in the light unit). I want to confirm that electricity is not flowing through the unit and it is safe to touch the unit. Can I use a ...
0
votes
2answers
10k views

How can I test a household LED light bulb?

Something is wrong with my GU10 base LED light bulb or with the light fixture but I don't know what's at fault. The fixture/bulb doesn't work and has never worked (new install). The fixture was ...
0
votes
3answers
78 views

Unable to measure table lamp AC amps using clamp meter

I decided to get the clamp meter in the image. And it say AC Current:60A/600A/1000A What does " AC Current:60A/600A/1000A" mean ? It only has one option for Amps AC. I was doing some ...
0
votes
1answer
59 views

Tried repairing a broken lamp and it's weirdly dim - high resistance in wire?

Neighbours threw out a gorgeous lamp, which had broken by the socket becoming disconnected from the wires. My housemate brought it home, and I tried rewiring it. Following an internet tutorial, I ...
0
votes
1answer
11k views

How to test voltage on open wire with multimeter?

If I have an open wire and a multimeter -- is there a way to check whether there is current and what voltage it is if the wire is not connected to anything, i.e. doesn't have another wire or an ...
0
votes
2answers
156 views

How to measure voltage AC using multi-meter

In the process of looking at why my doorbell is not working, I used a multi-meter to check Voltage AC. (I am very basic at electricals though). How would you check the voltage AC on a wire? Where ...
0
votes
2answers
145 views

Measuring AC Voltage Behind Light Switch

This is more of a theoretical question and not something I'm needing to do. I understand the following, please correct me if I'm wrong; Multimeter only measures the potential difference so To measure ...
0
votes
2answers
69 views

detect whether something is metal by touching it

I am doing things to my walls and can't tell whether I have pierced an electrical cable. My AC wire detecting studfinder seems unreliable. I have tried continuity tests via my multimeter between ...
0
votes
4answers
143 views

Is there any reason testing the neutral line on a dimmer light socket wouldn't work?

I am repairing a vintage lamp and replacing the socket with a dimmer socket. When I do a continuity test on the old socket, both the hot and neutral lines work. That is, they make a high-pitch noise ...
0
votes
1answer
813 views

NCV meter beeping over large area of a wall

I use non contact voltage tester function of Uni-t ut210e for detecting main wires under/in walls. It worked pretty well until yesterday. The wall is made of bricks/mortar and some metal profiles (as ...
0
votes
0answers
51 views

How do I test voltage without a ground/confirm a good circuit?

For context, I recently moved (into a very old home) and I have a series of recessed lights operating on a single switch. All but one light fine... what I assume is the last in the series does not. ...
0
votes
0answers
71 views

Non contact voltage sensor shows voltage a foot away from live wire

I'm evaluating a situation in a home I recently moved into. A previous owner did some DIY and installed a switch in the wall of our kitchen pantry. The pantry is made of wood and the switch is housed ...
0
votes
0answers
21 views

Switch wiring - strange multimeter readings

I'm about to replace a dimmer switch in my house (UK - Single Phase) and every wire in the backbox is red, while I've tested and identified each (live in, live out, neutral in, neutral out, neutral to ...
0
votes
0answers
48 views

Why don't I read voltage on a disconnected heating circuit?

I am trying to replace a broken in-wall electric heater. I wanted to confirm if the heater voltage that I am purchasing is the right one, so I got a multimeter and set it at 200V/500V (AC (V with ...
0
votes
0answers
455 views

Why do I read no voltage with my humidistat's solenoid is installed?

I've been troubleshooting my humidifier for a bit now (just learning this stuff as I go). It would appear the wiring for the furnace (apparently the transformer) meets the wiring for the humidistat ...