tlfong01 wrote: ↑
Tue Jul 03, 2018 7:41 am
I used my cheap multimeter to measure the resistance between two points.
Anyway, the results look OK, as summarized below.
Expected shorts = < 1.5 Ohms
Expected opens = > 200 Mega Ohms
Next step is to play with the voltage detector pen and the mains LNE fault detector plug.
I used to have a neon lamp screwdriver which I found very good. To detect a live wire, I use the neon screw driver to touch the hot line wire (I forgot if I should use my bare foot to touch the floor) , the neon lamp grows if the wire is hot.
So some years back when the electronic DIY shop gave me this detector pen for free, as my birthday gift, I did not appreciate it at all, because I found that thing a bit bulky, and also need to use a battery (AAA?, I forgot), what if the battery runs out and I could not find a new battery? So I thought I would still use my old friend, the neon screwdriver, and give away my birthday gift to a friend who likes to play with new toys. But I have not seen my friend for a long time, so I still keep my gift. Thus this unwelcome birthday gift has been sleeping in my tool box for years, collecting dust.
Just now I played with it and very surprisingly found it very nice, for the following reasons:
- 1. It is smart remote sensing. I don't need to touch the wire. I just place the plastic tip of the detector near to the socket, about 1 cm from L, N, or E.
- 2. What surprised me is that the thing is so sensitive that if I move near N, green light is on. When I move to L, red light is on, the thing also makes a warning beep. One thing I don't understand is that even if I move the top to E, red light and beep also on. I thought E should do nothing.
- 3. I googled and skimmed through the user manual and found it it can also detect low AC power. So I can use it for my 12V/24VAC power, but I have not tried it yet.
The line fault detector plug is also good. I plugged it to a power socket, but nothing happened. When I switched on power, all three lamps lighted up, meaning everything OK!
I should later check with my relay box, to see if I remove E, remove L, swap N and L, etc, this smart plug can warn me and tell me what goes wrong.
So I almost missed a good new tool because I thought old tools are better than new. This reminds me the following user who keeps on learning new things,
Why are Newbie's ignored? - BoyOh, Thu Apr 12, 2018
... The trouble is they won't [want] to learn electronics in in a short week end course,
I'm 86yrs and still learning, One advantage I had is i served a 7yre electrical apprenticeship way back in 1945.
No computers No calculators No transistors and NO GOOGLE.
When TTL was developed I had to start from scratch, but understood Ohms Law. But now electronics is all plug and play. Not much incentive to build circuits. ...
Regards BoyOh Retired Electrical / Electronics Technician
( Selby, North Yorkshire.UK)
I am an electronics, smart phone, and smart home hobbyist.