Internal structure of the motorised test pen and the dangers of damaging the motorised test pen
Internal structure of the motorised test pen and the dangers of damaging the motorised test pen
Traditional electric test pen structure is very simple, by the high resistance resistor, neon bulb, spring and pen cap composition, neon bulb in the low voltage state does not emit light, generally in the 100v or more to light up, if not drop is very difficult to damage.
High resistance resistor resistance value varies, theoretically greater than 500k ohms can meet the demand, but we hope that the greater the resistance value the better, of course, can not be infinity, then open circuit, in the measurement of the charged body does not glow, easy for us to produce a misjudgement, so the electric pen is the need for frequent inspection and maintenance.
So what happens when the resistance inside the electric pen is lower than the set value? Obviously, the electric pen in contact with a charged body when the human body is easy to electrocution, I believe that everyone, especially electricians have lessons in this regard.
Hazards of damage to the stylus
Resistance of infinity generated by the misjudgement, we may think that the electrical appliances are not electric, in the maintenance operation of the danger of electric shock, causing great harm to the person.
Resistance of less than 500k ohm stylus in the measurement of electrically charged body, will make a person produce a numb feeling, if the resistance value is even lower, the equivalent is the hand is touching the fire wire, the consequences are very serious.
Summary
Electricity stylus in the purchase, you can bring a multimeter to check the resistance value of the internal resistance, generally above the MΩ level, indicating that the quality is excellent, can be used for a long time.
