How can I use a digital multimeter efficiently? The digital multimeter's AC voltage block is very sensitive, even if there is a small induced voltage around it can be displayed. According to this feature, it can be used as a test electric pen.
The usage is as follows: the multimeter is hit to the AC20V block, the black pen is suspended, and the hand-held red pen is in contact with the side route or the device. At this time, the multimeter will display, if the display number is between a few volts and a dozen volts (different multimeters will There are different displays) indicating that the line or device is live, and if the display is zero or small, the line or device is not powered.
Distinguish whether the power supply line is a hot line or a zero line:
One: It can be judged by the above method: the fire line is displayed with a larger number, and the zero line is displayed with a smaller number. This method requires contact with the line or device being measured.
Second: there is no need to contact the measured line or device. Hit the multimeter to the AC2V block, the black pen is suspended, and the red pen is used to make the pen tip slide along the line. If the display is a few volts, it indicates that the line is a fire line. If the display is only a few volts or less, then the description This line is the zero line. This method of judging does not directly contact the line. It is not only safe but also convenient.
Third: Find the breakpoint of the cable When the breakpoint occurs in the cable, the traditional method is to use a multimeter to block the breakpoint of the cable for a period of time. This is not only a waste of time, but also a great damage to the cable. insulation. The disconnection point of the cable can be quickly found using the inductive characteristics of the digital multimeter.
First use electrical blocking to determine which cable core wire is broken. Then connect one end of the broken core wire to the AC220V power supply, then turn the multimeter to the AC2V gear position, the black test pen is suspended, and the red pen is held. Gently slide the nib along the line. If there is a voltage of a few volts or a few volts (depending on the cable) on the watch, if the display on the watch suddenly drops a lot when moving to a certain position, write down this. One location: under normal circumstances. The breakpoint is just 10 to 20 cm in front of this position.
In this way, it is also possible to find the breaking point of the resistance wire such as the faulty electric blanket.
Concerned about surprises
Tags: [Digital Multimeter] How to use efficiently
Previous: Why is the paint brush afraid of dampness and heat? The wet weather is on the brush Next: What is the working principle of the steam trap?
Air Blower,Gas Blower,Lawn Blower,Garden Blower
Ebic Tools Limited , http://www.ebictools.com