Multi-meter put a long time to install the battery can not be used how is it?
There are generally two types of multimeters that we often use:The first type is a mechanical multimeter. The second type is the electronic multimeter.
These two types of multimeter to do their power to the battery. Generally more than 2 1.5 Ⅴ
A section and 9 Ⅴ stacked battery.
If the multimeter is not used for a long time, it is best to put it in a dry and ventilated environment, and turn off the power switch is best to take out all the two batteries. In order to prevent put too long battery electrolyte external thanks, corrosion meter power supply positive and negative contact piece, light on the contact piece will appear on the oxide film affects the power supply contact, heavy on the two poles of the copper was corroded clean, corrosion of light with a knife or sandpaper to clean up the corrosion layer on the oxides, the positive and negative poles of the joint piece is completely corroded to be replaced by the joint piece.
When the multimeter is not used for a long time, it is better to take out the battery and put it in a dry and ventilated place with a wooden box to avoid moisture.
How to judge the fire wire and zero wire with multimeter? How to use a multimeter to measure fire wire and zero wire?
First, use the multimeter to hit the AC voltage file, then note that the range is greater than the measured voltage value, in order to be safe, please choose 500 volts and above gear, and then determine whether the meter pen is inserted in the measurement of the voltage of the hole (if it is the current hole, there will be a risk of burning the table). A pen contact reliable grounding ground, this pen fixed not to move away from the ground; another pen to measure any line (zero or any one of the fire line), this pen touch the line, when the table voltage display close to 0 on the line for the zero line, when the line touched, the table voltage display for the utility value of the line, this line for the fire line.
When there is voltage, we know that the middle of the zero line fire wire is 220 volts. Single-phase electricity, we set the multimeter in the alternating current voltage gear hit 220 volts. We measure the voltage with a single wire to ground, and as you know, there is no voltage between the zero and earth wires. And there is voltage between the fire and earth wires. At this point we can tell which one is the fire wire. And the rest are the zero and earth wires.
Then we measure the resistance of these two to ground. The one with less resistance is the earth wire, and the one with more resistance is the zero wire. Well, in that case, you've measured these three wires, which one is the fire wire, which one is the zero wire, and which one is the earth wire?
