A voltage tester is a simple device that checks for electrical current passing through a circuit. It is very helpful when doing any kind of DIY electrical work , such as wiring or installing light fixtures, or troubleshooting household devices, as it can warn you about an unsafe situation by detecting if electricity is still flowing before you find out the hard way. You can also use a voltage tester to check if a wire has sufficient voltage to power up certain electrical devices and machines. How you use this device simply depends on what you want it to read.
Place the positive and negative probes of the Megger on the two conductors or terminals between which you are testing the insulation resistance. If you are testing insulation resistance to ground, place the positive probe on the ground wire or the grounded metal junction box and the negative probe on the conductor or terminal. Energize the Megger for 1 minute. Read the value of the resistance at the end of the minute test and note it in your table. Continue with this testing procedure until you have values for all the spaces of your table.