How to detect cable breaks using a digital multimeter
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.
How to use a digital multimeter to detect wire breakage place
1, first of all, the digital multimeter ready for use, with a multimeter can easily measure a wire is through or broken.
2, and then put a wire on the table.
3, the multimeter will be the red plug in the right most socket, black plug in the COM socket can be.
4, and then twist the middle knob to the trumpet.
5, then let the metal contact wire bare metal wire ends, if a sound, there is a change in the value of the wire is not a problem.
6, if there is no sound, no change, the value shows 1 on behalf of the wire is broken, the resistance is infinite.
