Η αρχή και σκοπός της μέτρησης ηλεκτρική στυλό
A test pen is one of the tools commonly used by electricians to determine if an object is charged. Its internal structure is a light bulb with only two electrodes, filled with neon gas, commonly known as a neon bubble. One pole is connected to the pen tip, and the other pole is connected in series with a high resistance wire to the other end of the pen. Όταν η τάση μεταξύ το δύο πόλοι από α νέον φυσαλίδα φτάνει α βέβαιη τιμή%2γ α λάμψη είναι παράγεται μεταξύ το δύο πόλοι%2γ και το ένταση του του λάμψη είναι ανάλογο στο το τάση μεταξύ του δύο πόλων. πότε το τάση μεταξύ το το φορτισμένο σώμα και το γείωση είναι μεγαλύτερο από το λάμψη τάση στο το αρχή του του νέον φυσαλίδα, και το άκρη του του μέτρηση στυλό επαφές αυτό%2γ το άλλο τέλος είναι γειωμένο μέσω το άνθρωπος σώμα, so the measuring pen will emit light. The function of the resistance in the measuring pen is to limit the current flowing through the human body to avoid danger.
In addition to being able to determine if an object is electrified, the test pen also has the following purposes:
(1) It can be used for low-voltage nuclear phase measurement to determine if any wires in the circuit are in phase or out of phase. The specific method is to stand on an object that is insulated from the ground, hold a measuring pen with both hands, and then test on the two wires to be tested. Εάν το δύο μέτρηση στυλό εκπέμπει πολύ φωτεινό φως, το δύο καλώδια είναι έξω από φάση; On το αντίθετο, it is in phase, which is κρίνεται βασίζεται on the principle that the voltage difference between the two electrodes of the neon bubble in the measuring pen is direct proportional to its luminous intensity.
(2) it can be used to distinct between alternating current and direct current. when using a test pen for testing, if both poles in the neon bubble of the test pen emit light, it is an alternating current; If only one of the two poles emits light, it is direct current.
(3) It can determine the positive and negative terminals of direct current. Connect the test pen to a DC circuit for testing, and the electrode with the neon bubble shining is the negative electrode, while the electrode without the neon bubble shining is the positive electrode.
(4) It can be used to determine whether the DC is grounded. In a DC system with insulation to ground, standing on the ground can be used to contact the positive or negative poles of the DC system with a measuring pen. If the neon bubble of the measuring pen is not lit, there is no grounding phenomenon. If the neon bubble lights up, it indicates grounding. If it lights up at the tip of the pen, it indicates positive grounding. If it shines on the finger end, it is negative grounding. However, it must be pointed out that in DC systems with grounding monitoring relays, this method cannot be used to determine whether the DC system is grounded
