Capacitance function of multimeter
When electricians use digital multimeters, the basic function of capacitors in the circuit is to charge and discharge. However, many circuit phenomena derived from this basic charging and discharging function make capacitors have various uses, such as in electric motors, where electricians use them to generate phase shifts; In photographic flash, it is used to generate high-energy instantaneous discharges, etc; In electronic circuits, capacitors have various uses with different properties, and although they have distinct differences, their functions all come from charging and discharging. Here are some functions of capacitors:
Function of coupling capacitor: The capacitor used in coupling circuits is called a coupling capacitor. This type of capacitor circuit is widely used in impedance capacitance coupling amplifiers and other capacitor coupling circuits to act as a barrier between direct current and alternating current.
Function of filtering capacitor: The capacitor used in the filtering circuit is called a filtering capacitor, which is used in power filtering and various filtering circuits. The filtering capacitor removes signals within a certain frequency band from the total signal.
The function of the decoupling capacitor is to use a capacitor called a decoupling capacitor in the decoupling circuit. This capacitor circuit is used in the DC voltage supply circuit of multi-stage amplifiers to eliminate harmful low-frequency interconnections between each stage amplifier.
Function of high-frequency damping capacitor: The capacitor used in high-frequency damping circuits is called a high-frequency damping capacitor. In audio negative feedback amplifiers, this capacitor circuit is used to eliminate high-frequency self excitation that may occur, in order to eliminate high-frequency whistling that may occur in the amplifier.
Function of resonant capacitor: The capacitor used in LC resonant circuits is called a resonant capacitor, which is required in both LC parallel and series resonant circuits.
Function of bypass capacitor: The capacitor used in the bypass circuit is called a bypass capacitor. If a signal in a certain frequency band needs to be removed from the signal in the circuit, a bypass capacitor circuit can be used. Depending on the frequency of the removed signal, there are full frequency domain (all AC signals) bypass capacitor circuits and high-frequency bypass capacitor circuits.
Neutralization capacitor function: The capacitor used in neutralization circuits is called a neutralization capacitor. In radio high-frequency and intermediate frequency amplifiers, as well as television high-frequency amplifiers, this neutralizing capacitor circuit is used to eliminate self excitation.
Timer capacitor function: The capacitor used in the timer circuit is called a timer capacitor. In circuits that require time control through capacitor charging and discharging, timed capacitor circuits are used, where capacitors play a role in controlling the magnitude of the time constant.
Function of compensation capacitor: The capacitor used in the compensation circuit is called a compensation capacitor. In the low-frequency compensation circuit of the card holder, this low-frequency compensation capacitor circuit is used to enhance the low-frequency signal in the playback signal. In addition, there is also a high-frequency compensation capacitor circuit.
Function of bootstrap capacitor: The capacitor used in bootstrap circuits is called a bootstrap capacitor. The commonly used OTL power amplifier output stage circuit uses this bootstrap capacitor circuit to slightly increase the positive half cycle amplitude of the signal through positive feedback.
