pete the plug
Member
- Joined
- Jan 8, 2018
- Messages
- 14
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Thanks guys for the all the advice, I understand about the mutual capacitance of the conductors in the cable, and after a lifetime in electronics working with high voltage capacitors treat any potentially charged device with the utmost caution. I have in fact shorted together the conductors after The IR tests just in case of any residual charge.
Thanks for the tip about holding the button down for the entire test, I'll certainly make sure that I do that in future. On the MFT that I have, (Kewtech KT63) when IR testing, when the button is pressed, "wait" is displayed on the screen, along with a series of "chasing" lcd bars, the applied voltage, and an audible set of beeps. Also a flashing red LED on the instrument face warns of a high voltage on the probes.
The test takes about 3 secs, whether the button is held down or not, which seems a bit short compared with some "meggers" I've seen being used
When the test is complete, it beeps once if the reading is over 2 Mohm, and twice if it's under, the actual resistance reading is displayed on the screen and the voltage indicator reverts to zero to show no voltage any longer on the probes, Ill do some tests with a multimeter to see if in fact it does short out the leads to discharge any residual voltage on the cable being tested.
I do appreciate your comments, I've spent literally hundreds of hours reading up on the wiring regs, building regs, and some very instructive youtube videos produced by colleges for their students. It's been a bit of a steep learning curve, but quite a natural transition from decades involved with radio and electronics.
This is a very difficult subject to find any sort of mentor, as the often perceived reply to a question is " if you need to ask that, you shouldn't be doing it" which I'm sure in many cases is very true!
Thanks
Thanks for the tip about holding the button down for the entire test, I'll certainly make sure that I do that in future. On the MFT that I have, (Kewtech KT63) when IR testing, when the button is pressed, "wait" is displayed on the screen, along with a series of "chasing" lcd bars, the applied voltage, and an audible set of beeps. Also a flashing red LED on the instrument face warns of a high voltage on the probes.
The test takes about 3 secs, whether the button is held down or not, which seems a bit short compared with some "meggers" I've seen being used
When the test is complete, it beeps once if the reading is over 2 Mohm, and twice if it's under, the actual resistance reading is displayed on the screen and the voltage indicator reverts to zero to show no voltage any longer on the probes, Ill do some tests with a multimeter to see if in fact it does short out the leads to discharge any residual voltage on the cable being tested.
I do appreciate your comments, I've spent literally hundreds of hours reading up on the wiring regs, building regs, and some very instructive youtube videos produced by colleges for their students. It's been a bit of a steep learning curve, but quite a natural transition from decades involved with radio and electronics.
This is a very difficult subject to find any sort of mentor, as the often perceived reply to a question is " if you need to ask that, you shouldn't be doing it" which I'm sure in many cases is very true!
Thanks
