How Can Advanced Techniques Improve Short Circuit Detection?

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In summary, we discussed various methods for detecting shorts in a circuit, such as using a DMM or applying voltage through a source impedance. Another option is to program a board tester using a known good board and generate a table of known shorts and opens. This method, also known as ATE, can be fast and effective in identifying shorts in unknown boards.
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Blah937
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This is a theoretical question. Say we are imagining a way to detect whether a pair of circuits might be shorted together. There’s already hardware and firmware that sends pulses out on both of the circuits, and measures the response on the outputs. So, would we want to recommend additional hardware and/or software to apply test loads (R and/or C), or different signals, to any of those circuits?

In any case if the above doesn't make sense...how can we generally detect if there is a short in our circuit? I'm not looking for just apply a DMM and see if it beeps. lol. Thanks though! Any input would be greatly appreciated.
 
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  • #3
Blah937 said:
This is a theoretical question. Say we are imagining a way to detect whether a pair of circuits might be shorted together. There’s already hardware and firmware that sends pulses out on both of the circuits, and measures the response on the outputs. So, would we want to recommend additional hardware and/or software to apply test loads (R and/or C), or different signals, to any of those circuits?

In any case if the above doesn't make sense...how can we generally detect if there is a short in our circuit? I'm not looking for just apply a DMM and see if it beeps. lol. Thanks though! Any input would be greatly appreciated.

You pretty much use a technique analogous to what the DVM beeping tells you. Apply a voltage through a moderate source impedance and measure the voltage on the far side of the source impedance. Alternately you could measure the current through the source impedance, but just do whatever is easiest in your circuit.
 
  • #4
Blah937 said:
...

In any case if the above doesn't make sense...how can we generally detect if there is a short in our circuit? I'm not looking for just apply a DMM and see if it beeps. lol. Thanks though! Any input would be greatly appreciated.

That made me smile ...
well the other option is ... the short cct is likely to be where the greatest amount of circuit damage is done and from whence the smoke has issued :-p

Dave
 
  • #5
Once when troubleshooting a board I had access to an ohmmeter that could measure milliohms. I could actually measure the resistance of the traces and by following the path of least resistance I was able to find the short fairly rapidly.

When I used to program board testers, we programmed the testers using a known good board. With that board we generated a table of known shorts and known opens. When an unknown board was tested, running through the shorts and opens was very fast and very effective. Only after passing shorts and opens would the tester check the impedances between nodes.
 
  • #6
skeptic2 said:
when i used to program board testers, we programmed the testers using a known good board. With that board we generated a table of known shorts and known opens. When an unknown board was tested, running through the shorts and opens was very fast and very effective. Only after passing shorts and opens would the tester check the impedances between nodes.

Also known as ATE.
 

FAQ: How Can Advanced Techniques Improve Short Circuit Detection?

What is a short circuit?

A short circuit occurs when there is an unintended connection between two points in a circuit that have different voltages. This creates a path of low resistance, causing a large amount of current to flow through the circuit.

What causes a short circuit?

Short circuits can be caused by a variety of factors, including damaged or faulty wiring, loose connections, moisture or debris in the circuit, or physical damage to components. They can also occur if the circuit is overloaded with too much current.

How can I detect a short circuit?

One way to detect a short circuit is by using a circuit tester or multimeter. These tools can measure the voltage and resistance in the circuit and help identify where the short is occurring. Visual inspections of the wiring and components can also help identify potential short circuits.

What are the dangers of a short circuit?

Short circuits can pose serious risks, including electric shocks, fires, and damage to electronic devices. They can also cause power outages and damage to electrical systems. It is important to address short circuits as soon as they are detected to prevent these dangers.

How can I prevent short circuits?

To prevent short circuits, it is important to have proper wiring and connections in your circuits. Regularly checking for damaged or worn wiring, avoiding overloading circuits, and keeping electrical devices away from moisture can also help prevent short circuits. It is also important to use circuit breakers or fuses to protect against excessive current flow.

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