# Questions tagged [continuity]

Checking of an electric circuit to see if current flows.

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334 views

### Low current continuity checker

Let me preface this by saying I have minimal electronics experience and reading data sheets is slightly confusing, but I get a gist of how most components work. I am making a lower current continuity ...
765 views

### How can I make a continuity check for a model rocket igniter?

I am currently working on a model rocket controller. It should fire a rocket model using a standard model rocket igniter (e-match). To ensure safety, I want to check for continuity trough the igniter. ...
• 97
79 views

### Does continuity equation applies for magnetic charge and magnetic current?

I wonder if, since we are capable of defining a charge and some magnetic currents, we can apply the continuity equation to them in such a way that: \frac{\partial \rho_{\text{mag}}}{\...
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166 views

### In circuit debugging using continuity test on DMM give un-predictable results

I did a continuity test, between a ground point of my PCI card (audio) and a resistance (47Ω SMD). No beeping sound on both ends of the resistance. After I de-soldered the resistance from the board, I ...
• 27
107 views

### Why 230 V shows up in a staircase light circuit even though 'live' is disconnected? Why is there no continuity between the light bulb and neutral?

There's a staircase light circuit in my house similar to the one shown below. I disconnected 'live' from the switch on the left and measured the voltage between its 'L1' terminal and neutral and then ...
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100 views

### Ribbon Cable Pin Assignment

Preface: I am complete novice at electronics and this is my first project. I am trying to connect two PCB together with a 10pin ribbon cable. The ribbon cables I made (and bought) are all showing ...
433 views

### How to know which component in a PCB is causing the short if they're connected in parallel?

The problem is that I have an increased current in my whole circuit than should be, the required current is 0.26 amp, but I have 0.45 amp. After conducting continuity tests, I found that one of the ...
• 251
149 views

How can I add a buzzer to my EverStart Digital Multimeter 10711WDI circuit board, so that it buzzes when there is continuity?
73 views

### Polarity of a circuit

TLDR: Trying to determine polarity of pads, findings in the pics. I’m new to electronics. I’m trying to replace an annoying proprietary barrel connector with a direct wire to a dc power supply. I ...
989 views

### Any way to test continuity of a potentially live circuit?

I'm trying to add an indicator to a relay circuit; specifically, I want to know if it's open or closed in a way that can detect contact welding. (I considered a DPDT relay, but it looks like these ...
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8k views

### Why does the multimeter detect continuity between live and neutral of my appliance? [closed]

I was doing some random checks with my new multimeter and while doing a continuity test I heard the beeping noise when connecting the multimeter to the live and neutral ends of the plug for my 220v ...
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1 vote
76 views

### Forcing current on capacitor tied to ground [closed]

I have a device with a capacitor tied to ground. If a negative current of 1 mA is being forced out of that pin, I am trying to better understand capacitor operation in this area. My questions are as ...
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139 views

### Inverter battery charging [closed]

If I connect a battery charger to my inverter AC output to charge the inverter's battery ,can I get a continuous power supply?
387 views

### Mistakenly performed continuity test on the supply voltage (+12V). How can I determine if my multimeter was damaged? [duplicate]

I was testing continuity with ground in a breadboarded circuit and accidentally touched the supply rail (12V). My multimeter is a greenlee dm-820a. Everything seems to be working fine, but I am ...
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949 views

### How to utilize USB-Type-C connector as a normal connector?

I designed two custom PCB boards with one acting as my main Sensor Board and having a Controller (ESP32) interfacing all the sensors and peripherals. The other board is a programmer board that houses ...
164 views

### Continuity test isn't working on a ribbon wiring harness

I have extracted this wiring harness from the valve body of the transmission. But when I did a continuity test with a multimeter to diagnose if there was any problem with the wires, there was no ...
• 251
371 views

### Why are two of the wires in my ignition switch showing reversed continuity? [closed]

My motorcycle manual indicates that when the ignition switch is in the ON position, continuity should exist between the red and brown wires (which it does) and also between the black and black/white ...
• 1
1 vote
406 views

### Simple wire continuity tester, but also needs to check shorts

I am trying to create a simple cable tester, that needs to check continuity of a multiwire cable. My first thought was to connect all wires at one end to a positive voltage, and connect LEDs at the ...
• 167
179 views

### Basics - help with resistance reading

I'm trying to solve an issue with my eletric radiator and more specifically either the heating element or control panel (circuit board.) I've tested the element with a multimeter and it is showing ...
143 views

### best way to batch test continuity?

I'm batch making pcbs that have fpc connecters with high pin count (50) and fine pitch (0.5). I'm soldering these by hand and was wondering how I could batch test continuity? at the moment I am going ...
4k views

### Can continuity test cause component damage?

In order to test some tracks on a mounted PCB, I would like to use a multimeter for continuity test. However, then I measured the open-circuit voltage of two multimeters at hand, and the results were:...
• 579
215 views

### Why no conductivity with this wire?

These are two ends of the same cable: The cable comes from an old headphone set and I want to re-purpose it. What are those copper looking wire strands? I could not get connectivity between them and ...
• 123
540 views

### Circuit to know when two batteries are connected to each other

I'm using a Victron Cyrix (12V 120A) Smart battery combiner to connect the starter and the leisure battery in my RV. I wanted to know when the two batteries are connected to each other, but ...
12k views

### Digital Multimeter "Continuity test" only one single beep

Well I have two electronic circuit, one is broken and the other is solid and working. While I am making Continuity test with Fluke Multimeter on working electronic circuit, the bip voice heared only ...
• 1,163
1 vote
337 views

### high-resistance continuity detector

I'd like to build a device that can detect a weak electrical connection, likely in the domain of tens of megaohms up through low gigaohms, so that a circle of people holding hands can trigger the ...
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3k views

### Continuity testing - Why does swapping DMM probes give differing results?

Continuity query - Can anyone explain this? Circuit is a simple 12v DC, wired as follows -battery pos to bulb to spst switch back to battery earth. Testing with DMM in the dedicated audible ...
1 vote
5k views

### Measured continuity between live and neutral

I was trying to get rid of the humming noise coming from my speakers in my hi-fi system. It is an old piece of equipment from back when the UK appliances did not come with the mains plug and you had ...
1 vote
253 views

### Continuity with NodeMCU on metal door

I want to have a sensor to let me know if a door is locked or not. I've placed two wires inside the lock mechanism of the door, so when the door is locked the continuity test on the multimeter make a ...
1k 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 ...
725 views

### How to test for shorts on a breakout?

Working on LoRa project with the RFM95W. Most online resources like 1 and 2 suggest using a PCB since the module itself is quite small and hard to work with; but where's the fun (and learning) in ...
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914 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 ...
72 views

### Mysterious current flow through socket

I was measuring a device that isn't working with an continuity meter. I've identified this socket as the problem. It sits between the batteries and the rest of the device, I guess for loading the ...
11k views

### Reading values on continuity test but there is no beep

When checking traces of my PCB I realized that checking continuity between one of the output trace and GND some values appear on multimeter screen but the buzzer does not beep. On the Vcc trace ...
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373 views

### How to know if a SCR is still working?

I'm using a TIC116 to control the power over an electric grill. However, I didn't use a heatsink and it got very warm. On the data it says that its upper limit is 110 °C. I suspect that the gate is ...
• 13
57 views

### Laplace Transform without given continuity variables

simulate this circuit – Schematic created using CircuitLab So I was trying to solve problems in preparation for an exam regarding Laplace Transforms. I was able to solve some problems and then ...
431 views

### is graphene not inheriantly conductive?

I ordered some graphene off ebay to test on some applications and I am unable to get continuity. I applied a layer of graphene on some two sided tape, made sure the adhesive was completely covered, ...
136 views

### How to measure continuity between two FPGAs

I have two FPGAs, one will contain test chip and one contain memory and I2S interface and some control signals for jtag. Right now the chip is not available on the board but its connections are such ...
• 115
14k views

### How would I test the continuity of an anti-static wrist band?

I am looking to purchase some anti-static gear for when working on electronics(I'm assuming all electronics should be worked with on an anti-static pad, that's correctly grounded, correct?), and ...
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1 vote
1k 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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845 views

### Separating Phase and Neutral in AC?

I need determine if a cable is connected to a wall-socket (230V) on the other end with a timer in-between. 230VAC---TIMER---CABLE Depending on how the timer is ...
• 21
1k 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 ...
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1 vote
269 views

### Detecting a break in continuity where no voltage drop occurs

I have a solar charger on a vehicle which I need to protect: Schematic is down there... The charger connects to the main battery, and the solar panel, but the manual specifically states that you MUST ...
• 7,179
1 vote
2k views

### Two multimeters in continuity mode, only 1 buzzer

I have two identical digital multimeters both with new batteries. I set both to continuity mode and connected the leads to each other. Only one of the meters buzzers went off. They both work ...
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