[CC] How to Test Low Resistance with Hioki IR4057 (0.01 Ohm resolution) 

If you mean feeder or branch circuits, the basic principles are the same. The circuits should be completely de-energized and all loads disconnected before testing their insulation resistance. But there's a lot more than this. So if you wish to know more I suggest further reading, or better yet training for safety and proper implementation.

Salamat sa suporta Sir BP😄

Thanks for your comments. I think you were asking where low resistance testing can be used? I believe it can be important in testing for contact resistance, for example, of switches, connectors, breakers, & relays. High resistance in these devices may indicate oxidation and poor contact, which can lead to heat. It can also be used to check for conductivity of wiring conductors- the lower the resistance the better. I'm sure there are other applications for it. While you can do these tasks using the Ohmmeter function of a general purpose digital multimeter, their Ohmmeter often cannot go below 1 Ohm. You cannot also calibrate their test leads to start at zero Ohms. So, if you want below 1Ω value, & you need to eliminate test leads' resistance, you need something else. Although the IR4057 not a dedicated low resistance meter, it has a relatively good resolution (0.01Ω), 200mA testing current, & zero ohm adjuster (0.00Ω). So it can quickly test for low resistance (below 1Ω) when very high accuracy and precision aren't critical.

Thank you so much I bought 4056-20 after ur review 4057 -20, iam ac technician but I regularly watching ur video. 💓

@@narayanaya5519 Thanks for watching my videos. I share what I can & I also learn from others. Congratulations on your new IR4056-20👍! It has a low resistance function also. It is made in Japan & I am sure it will serve you well as an AC technician & in your other electrical projects, too. Good luck!

@@ramschannelreviews 🙏