How to use the digital galvanometer pen
There are ordinary electric pens and digital electric pens, ordinary electric pens have a single function, which is to measure the firewire.
There are two ways to hold
Neon light is the fire wire, not light is the zero line, measuring voltage range between 60 to 500 volts, below 60 volts when the neon test pen may not glow.
Precautions for using the electric pen: first observe whether there is any resistance inside the pen, and whether the pen is wet. With both of these conditions, can not be used.
Digital electric pen
Digital electric pens have more functions, measuring firewire, measuring breakpoints, and some can also be measured on and off. For more information, you can read this article I posted yesterday ↓↓↓↓↓↓
This is the wiring of two kinds of light bulbs
One is single connection single control wiring, one is double control wiring. We can see that when the switch is closed, the bulb is connected to the fire wire and the zero wire. So we can directly use the electric pen to test the fire wire and zero wire end.
1, electric pen test, if the fire wire has power, the zero wire also has power, is the zero line is broken. After the zero line is disconnected, in fact, it is equal to the fire wire strung with a light bulb, the so-called zero line position of the electric pen test, in fact, is still the fire line.
Solution: use a digital pen to test the break point, along the so-called zero line a little bit to find the past.
Batch head directly near the wire insulation skin can be, there are electric display high voltage symbols!
2, the fire wire, the zero line are not electric
This situation is certainly the fire wire is broken, also use the pen to measure the breakpoint, a little bit to find the location of the fire wire breakpoint.
3, the firewire power, zero line no power, this is the normal state. If the light does not light up in this case, you can only check the lamp holder and the lamp. If you have a multimeter is more accurate, directly measure the voltage at both ends is normal.
