NCV testers should rarely be used, especially if the way they work is not fully understood. There are many ways for false positives and false negatives to manifest themselves. The Lo impedance option is useful for getting a useful reading where the circuit is showing misleading readings. Useful series - thanks!
@@mrcombiBedford Normally, a decent multimeter will have a high input impedance, that is the resistance between the two probes on a decent Fluke meter will be 10 MEG ohms. This means you can take measurements in many systems without loading the circuit and dropping the voltage. However, there are situations where you can get capacitive coupling between cables so even when you've turned off a circuit, nearby energised cables couple a small amount of energy into your dead cable. When measured with a high impedance meter, you might see 100+ V. When you switch the meter to low impedance mode, this drops the internal resistance of the meter and effectively tells you if this voltage is 'real' by loading it with a few kilo ohms impedance. You would normally be able to enable/disable this feature as needed though otherwise you'd not be able to measure the rectification voltage or thermocouples with that meter.
Hi Hamaad, thanks for asking, If you are fixing boilers / air con or similar the best is Fluke 116 or very similar and much cheaper is EXTECH 330 from Pass: www.pass.co.uk/ please mention Mr Combi. All the best, george 👍
@@mrcombiBedford thanks a lot the fluke is out of my budget atm as not doing much fault finding. Will most definitely if I do with the extech cheers mate
Hi Dickie, thanks for asking, Hz is not just used as a radio or TV frequency but it's the best way to measure a pump / fan or anything that moves. I found Vaillant publish lots of data in Hz. A pump can be 2K revs but we can't measure revs. but we can in Hz. which is 100% accurate. Most will use Ohms and volts which is OK but Hz is faster and more accurate . Hope the helps, take care George 🤩👍
@@dickiedubs3137 Hi Dickie, thanks again for your comment, Yes it is but when you buy a new M Meter you know to include Hz. Polski saying, "We learn ALL our lives and die stupid" take care, George 😍👍
Hi Raj, thanks for your feedback I have just finished a project about the best meter in 2023 should be uploaded this Friday 6pm. Enjoy and please let me know your feedback Regards George Staszak 👍
Mr combi is one of the most underrated gas specialists on the net!!! Love your work amigo
Dear Candid, many thanks for your lovely comment and support, we love that we are helping others, make it all worth it, all the best, 🥰👍
NCV testers should rarely be used, especially if the way they work is not fully understood. There are many ways for false positives and false negatives to manifest themselves. The Lo impedance option is useful for getting a useful reading where the circuit is showing misleading readings. Useful series - thanks!
Dear SDG, thanks for the like, Flue has started with Lo Zee meters what's the advantage or point? Do you know why, george
@@mrcombiBedford Normally, a decent multimeter will have a high input impedance, that is the resistance between the two probes on a decent Fluke meter will be 10 MEG ohms. This means you can take measurements in many systems without loading the circuit and dropping the voltage. However, there are situations where you can get capacitive coupling between cables so even when you've turned off a circuit, nearby energised cables couple a small amount of energy into your dead cable. When measured with a high impedance meter, you might see 100+ V. When you switch the meter to low impedance mode, this drops the internal resistance of the meter and effectively tells you if this voltage is 'real' by loading it with a few kilo ohms impedance.
You would normally be able to enable/disable this feature as needed though otherwise you'd not be able to measure the rectification voltage or thermocouples with that meter.
@@sdgelectronics Thanks too much technology Am I correct, in LoZZ earth to live test can trip the circuit breakers
@@mrcombiBedford Yes in Low Z mode it'll very likely trip if testing to earth, but it will depend on the meter.
Thanks for the info, take care, george
Hi what’s the best multi meter to measure resistance on zone valves etc ?
Hi Hamaad, thanks for asking, If you are fixing boilers / air con or similar the best is Fluke 116 or
very similar and much cheaper is EXTECH 330 from Pass: www.pass.co.uk/ please mention Mr Combi. All the best, george 👍
@@mrcombiBedford thanks a lot the fluke is out of my budget atm as not doing much fault finding. Will most definitely if I do with the extech cheers mate
@@hamaadrana6191 EX330 is what I use in all my videos regards, george
@@mrcombiBedford thanks I’ve just ordered it hopefully it reads zone valves resistance, main thing I need it for
Hertz.....I don't understand either
Hi Dickie, thanks for asking, Hz is not just used as a radio or TV frequency but it's the best way to measure a pump / fan or anything that moves. I found Vaillant publish lots of data in Hz. A pump can be 2K revs but we can't measure revs. but we can in Hz. which is 100% accurate. Most will use Ohms and volts which is OK but Hz is faster and more accurate . Hope the helps, take care George 🤩👍
@@mrcombiBedfordSo my regin one touch is going to be useless at measuring hertz
@@dickiedubs3137 Hi Dickie, thanks again for your comment, Yes it is but when you buy a new M Meter you know to include Hz. Polski saying, "We learn ALL our lives and die stupid" take care, George 😍👍
hi good video what what you say about using the tpi 100 multi meter thanks
TPI is a very good meter for most installers who just need an easy to use meter. take care, george
@@mrcombiBedford thanks for reply and finally do you need a true rms multimeter for boiler fault finding or would you not bother thanks
@@marka4706 Always best to have a Fluke RMS meter except Low ZE. Thanks for asking
Brilliant vid
Thank you very much for your review, glad to help, take care George Staszak
Fluke 116??
Is that any good?
Hi Raj, thanks for your feedback I have just finished a project about the best meter in 2023 should be uploaded this Friday 6pm. Enjoy and please let me know your feedback
Regards George Staszak 👍