Using a digital multimeter to determine the method of wire and cable breakpoints
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. Now given with a digital multimeter to determine the method of cable > wire cable breakpoints.
When the cable or the cable's internal broken line fault, due to the external insulation skin package, so that the exact location of the broken line is not easy to determine. With a digital multimeter can be this difficult problem easily. Specific method: connect one end of the wire (cable) with a break point to the 220V mains firewire, the other end is suspended. The digital multimeter will be pulled to AC2V block, from the wire (cable) of the firewire access to the end of the beginning, 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 to move slowly, this time the display shows the value of the voltage 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 the position forward (firewire access) 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.
Overview of digital multimeter
Digital multimeter is a small digital multimeter with three and a half digit LCD display. It can measure AC and DC voltage and AC and DC current, resistance, capacitance, transistor β-value, diode on voltage and circuit shorting, etc., by a rotary band switch to change the function and range of measurement, a total of 30 gears.
The maximum display value of this multimeter is ±1999, it can automatically display "0" and polarity, and display "1" or "-1" when overloaded, and display "←" when the battery voltage is too low. When the battery voltage is too low, it displays "←" sign, and short-circuit check with buzzer.
