How to use a digital multimeter to detect breaks in cable wires
Digital multimeter in addition to voltage, current, resistance, capacitance and transistors and other basic parameters of the measurement, but also through the use of variations, so that its function to be further expanded, to achieve the purpose of a table multi-purpose.
Using a digital multimeter to determine the method of wire and cable breakpoints:When the cable or the cable's internal broken line fault, due to the external insulation skin package, the
So that the exact location of the broken wire is not easy to determine. With a digital multimeter can be easily fixed this problem. Specific method: the break point of the wire (cable) connected to one end of the 220V mains on the fire wire, the other end of the suspension. The digital multimeter will be pulled to AC2V block.
From the wire (cable) of the fire wire access end, with a hand pinch the tip of the black pen, the other hand will be the red pen along the insulating skin of the wire slowly moving, the display shows the voltage value of about 0.445V (DT890D type table measured) or so.
When the red pen moved to a certain place, the display shows the voltage suddenly dropped to 0.0 volts (about one-tenth of the original voltage).
From this position forward (firewire access terminal) of about 15cm is the wire (cable) where the breakpoint.
With this method of checking the shielded wire, if only the core wire broken and shielding layer is not broken, then this method is powerless.
Digital multimeter how to test a wire through the broken
Turn the selector knob of the digital multimeter to the ohms, which is the R position.
Then put the two pens together, the meter should read 0, the next pen were connected to the first line of the first to see what the display.
Is 0 means through, not 0 or digital infinity means broken circuit.
Test before you can put the multimeter red pen and black pen contact to see the numbers, certainly 0, then test the wire is through the decisive is 0, otherwise there are numbers, and digital infinity means that the circuit is broken.
