The Method of Judging the Breakpoint of Line by Digital Multimeter
Regarding the method of judging the breakpoint of the line by the digital multimeter, connect one end of the wire with the breakpoint to the live wire of 220V mains, and hang the other end in the air, pull the digital multimeter to the AC2V gear, and start from the live wire access end of the wire for judging The location of the line break.
In addition to the measurement of basic parameters such as voltage, current, resistance, capacitance and transistors, the digital multimeter can also be used flexibly to further expand its functions and achieve the purpose of multi-purpose.
Here is a method for judging the breakpoint of wires and cables with a digital multimeter. When there is a broken line fault inside the cable or cable, the exact location of the broken line is difficult to determine due to the wrapping of the outer insulation skin. This difficult problem can be solved by using a digital multimeter. Easy to do.
specific method:
Connect one end of the wire with a breakpoint to the live wire of the 220V mains, and leave the other end in the air. Pull the digital multimeter to the AC2V gear, start from the live wire access end of the wire, hold the nib of the black test lead with one hand, and slowly move the red test lead along the insulation of the wire with the other hand, at this time the display shows The voltage value is about 0.445V.
When the red test pen moves to a certain place, the voltage displayed on the display screen suddenly drops to 0.0 volts, and about 15cm forward from this position is where the breakpoint of the wire is.
The basic error of the multimeter
There are two ways to express the basic error of the multimeter.
For DC and AC voltage blocks and current blocks, it is expressed as a percentage of the upper limit of the working part of the scale. The scales of these blocks are linear or close to linear; for electric blocks, because the scale is non-linear, the total arc of the scale is used instead. A long percentage to represent the basic error.
The basic error value of electric resistance marked in the multimeter manual or on the dial is only applicable to the center position of the ohm scale (that is, the center of ohm), and the basic errors at other scales are greater than this value.
