BM500A: low budget meg-ohm & isolation testing ? 

Terminal G is used in a measuring circuit with shielding from leakage currents. In this circuit, L is connected to the line, E is connected to ground, and the conductor of terminal G is wound around the insulation of the line core with several turns.

G- Terminal is been used as guard, during testing of line to line or different phases of cables. eg: L terminal to Red phase, E- Terminal to Y phase and G -Terminal to Ground for guarding

I enjoy your reviews very much. Some of the most accurate I have seen. Thank you.

Great video thank you very much (I've clicked like). You didn't mention what the "G" terminal is for, but I already see the answer in other comments

Seems reasonable enough for a megger I'm seeing as low as 21 USD delivered. I was thinking of making a 1kv capacitor tester for an upcoming project but at this price I'm reconsidering. I generally like this cheap test gear, as you said, no good for a lab or industrial environment, but quite serviceable for hobby use.

This is a insulation resistance tester. It tests if there are breaks in the insulation of cables, windings etc. If the insulation is damaged you will get a low ohm reading. If the insulation is still good then you will get a high ohm reading

Thanks for job. Interesting to here detailed information (and logic) about insulation testing of cables and inputs of some devices, it s logic with reference to standards IEC. Times, durations, motherboard gaps, spark gaps and so on. Unfortunately device has only 1000V output, at the same time insulation resistance of many cables has 20-100 mOhm up to 10 tOhm values, so it can be used at narrow feild. Which currents should flow or not under testing and so on.

Very interesting video! Good job. I was shocked when I saw that they used only 400V capacitors in the voltage multiplier, I wonder how long they will last..

HTC 830L+ multimeter review please

Hi there. Another bargain. I managed to buy one of these direct from China to the UK from eBay for a little less than £14! Like you, I couldn’t really find anything that failed a test and all I could do was measure a 10 meg resistor and my multimeters. I got a value of 10 meg ohms for a Fluke at all the voltages (interestingly, it measures 11 megs when measured with an ISOtech multimeter that uses a low voltage. I wonder which is more accurate?) Better still while thinking and experimenting I learned a bit about analogue meters. I have an Avo model 8 (purchased brand new by my Father for £19 19s and 6d on 13th May 1959, I have the invoice!). For some reason I always thought the 20,000 ohms a volt applied to the value being measured. It doesn’t, it applies to the full scale deflection. On the 1000v DC range the impedance of the Avo is about 20 megs. On the 2500v DC range its 50 megs, some five times higher than the Fluke.. The accepted wisdom of the modern World is that digital meters are always far higher impedance and have less effect of the circuit under test. Well obviously not at high voltages!

Hi, thanks for the video. What is the use the Hold switch. Only to maintain or to press before Test and then will maintain the measure?

Hi Great video. Do you know why the leads are seemingly the wrong way around I hope to test piezo diesel injectors and polarity is important and i cannot understand that the live red lead is connected to the earth Regards

For high voltage testers you need to output a minimum current to cope with leakage.1.5mA is not much but probably ok for hobby use. Today in industry it is common to use minimum 200mA, but they do cost rather more!

Do you have reference video for test measuring at 3 phase electro motor

cual de los terminales va al bobinado de un motor y cual a la carcaza? saludos👍

The reading flashes up only for a fraction of a second. How do you use hold?

In this device, the "L" - terminal is a negative potential. And on terminal "E" - positive potential. Why is it done or indicated so?

A currently purchased device has hardware version 1.6

G to экранирующая оплетка.