You have raised an important issue. However you need to remember that NCV or live wire detection function is "a complimentary" *function* built in multimeters. It is *not* a primary function. This is why you can in Brymen 789, 786 etc insert black lead into COM socket and probe with this lead the suspecter live wire. This is your *second line* of defence. Howevere even then you must as an engineer to find out beyond doubt that wire is live or not. If we take as an example an electrical field of application of this approach based on certain process steps then you need to know prior starting any work with suspected live wires in what *category* environment you are measuring.This is why many electricians carry so-called "contrоl bulb" with them etc. You certainly have demonstrated one important moment - *do not trust your eyes and senses*, and doubt even most advanced testing equipment you may have. This is why *Electronics Engineers* learn this not from youtube or internet. Problem you are highlighting is important though, especially for young, inexperienced electricians who have limited experience.For the general public it is better not to think that they *can fix themselves* this old TV set with 25kV inside..or USB charger *connected* to mains. Takes a split second to make a once in life time *mistake* . Respectfully
Hi! I wanted to say thank you, I was wondering why my new meter EF function responds to a 5v USB charger and just saw your video, I think you really prevented me from committing suicide lol
I think NCF use was only for detecting cables inside walls witch actually handy for electricians. And not for information if it has live voltage or not.
By what I've seen it's pretty much according to specs. Personally I view it more as a back-up or add-on functionality for field convenience. Productively I only used it in cases, where I wanted to check if an auxilary 5V supply was also switched off by what I was doing. Was good enough for that. If I wanted to knew the actual exact voltage I would have taken the DMM. Due to the low input impedance of two-pole voltage testers it's usefullness for electronics is limited.
@@High.On.Voltage thanks for the quick reply. i was just going to use it for electronics and i will give my duspol a chance :) at my own risk of frying my controller of course
You have raised an important issue. However you need to remember that NCV or live wire detection function is "a complimentary" *function* built in multimeters. It is *not* a primary function. This is why you can in Brymen 789, 786 etc insert black lead into COM socket and probe with this lead the suspecter live wire. This is your *second line* of defence. Howevere even then you must as an engineer to find out beyond doubt that wire is live or not. If we take as an example an electrical field of application of this approach based on certain process steps then you need to know prior starting any work with suspected live wires in what *category* environment you are measuring.This is why many electricians carry so-called "contrоl bulb" with them etc. You certainly have demonstrated one important moment - *do not trust your eyes and senses*, and doubt even most advanced testing equipment you may have. This is why *Electronics Engineers* learn this not from youtube or internet. Problem you are highlighting is important though, especially for young, inexperienced electricians who have limited experience.For the general public it is better not to think that they *can fix themselves* this old TV set with 25kV inside..or USB charger *connected* to mains. Takes a split second to make a once in life time *mistake* . Respectfully
Hi! I wanted to say thank you, I was wondering why my new meter EF function responds to a 5v USB charger and just saw your video, I think you really prevented me from committing suicide lol
What is the best way to check if there are any electrical wires in the wall before starting to drill ?
I wonder the same. My whole wall beeps and sometimes doesn't. Can't imagine that it's full oif electrical wires.
I think NCF use was only for detecting cables inside walls witch actually handy for electricians. And not for information if it has live voltage or not.
Can you say something about the voltage accuracy of your duspole compared to the multimeter? especially for the "Lo U" mode
By what I've seen it's pretty much according to specs. Personally I view it more as a back-up or add-on functionality for field convenience. Productively I only used it in cases, where I wanted to check if an auxilary 5V supply was also switched off by what I was doing. Was good enough for that. If I wanted to knew the actual exact voltage I would have taken the DMM.
Due to the low input impedance of two-pole voltage testers it's usefullness for electronics is limited.
@@High.On.Voltage thanks for the quick reply. i was just going to use it for electronics and i will give my duspol a chance :) at my own risk of frying my controller of course