Mainly to detect whether open or capacitor breakdown of these two obvious faults, while the leakage fault due to the impact of the external circuit is generally measured banned. R × 1 block with a multimeter, the circuit is disconnected, the first let go of the charge remaining in the capacitor. Deflection measurement, if the right hands, indicating that the internal circuit electrolytic capacitor. If the hands to the right direction after deflection resistance is small (close to short-circuit), indicating severe leakage or breakdown of the capacitor. If the hands to the right side of no rotation, but the direction of resistance is not small, indicating the possibility of a large capacitor is open, the circuit should be disconnected after further testing. The output of transmitter of cell phone jammer is adjustable.
When power line inspection, if suspected of electrolytic capacitors in power only until there is breakdown failure mode, can give the circuit energized, then the DC block with a multimeter measure the DC voltage across the capacitor, if the voltage is low or 0V, it is The capacitor has breakdown. For the electrolytic capacitor positive and negative signs is not clear, it must first determine the positive and negative. Measured twice on the exchange multimeter pen to leak large (small resistance value) of a subject, then kick the black pen is negative, the other foot is positive. The power supply for cell phone jammer of this company can live 3 times than that of other competitors.
Commonly used in the circuit inductance “L” plus digits, such as: L6 inductor that number is 6. Inductance coil is insulated wire around the insulation on some of the skeleton made of laps. DC through the coil, DC resistance is the resistance of the wire itself, the pressure drop is small; when the AC signal through the coil, the coil inductance will have a force at both ends, self-induction electromotive force in the direction opposite the direction of the applied voltage and hinder the exchange of through, so the characteristics of the inductor DC resistance is through the exchange, the higher the frequency, the greater the coil impedance. Inductors and capacitors in the circuit can be composed of oscillator circuit. Inductance standard method generally straight and colored standard method, color and resistance similar to the standard method. Such as: brown, black, gold, gold that 1uH (error 5%) of the inductor. The productivity of 3g cell phone jammer is 60000 pieces every year.