NEWS

Microphone structure and working principle

Microphone structure and working principle

Moving coil microphones are also called electric microphones. They are similar in structure to electric speakers and are also composed of magnets, voice coils and sound membranes, as shown in Figure 12-11. The voice coil of a moving coil microphone is in the magnetic field of a magnet. When sound waves act on the sound film to vibrate, the sound film drives the voice coil to vibrate accordingly, causing the voice coil to cut the magnetic lines of force to generate an induced voltage, thus completing the sound-electricity Conversion. Because the resistance of the voice coil is very small. Its impedance is very low. The function of the impedance matching transformer is to change the impedance of the microphone to match the input impedance of the amplifier.

 2021-02-26

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Multi-channel speaker reliability test program

Multi-channel speaker reliability test program

At present, the speaker aging life testers on the market are generally composed of a combination of signal source + power amplifier, which can no longer meet the increasingly stringent test requirements for product quality, and generally do not have the following test requirements and conditions:

 2021-02-26

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High-power speaker reliability test program

High-power speaker reliability test program

ZC5860 series loudspeaker reliability test system (Loudspeaker Life Test System) is a professional equipment used for speaker (or earphone) reliability test. The system has built-in stable multiple noise signal sources and digital filters, and automatically calibrates and measures the output signal; the current, voltage, impedance and power data during the test are recorded regularly through the computer, which can analyze the performance of the speaker.

 2021-02-25

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What is the important role of insulation resistance tester in testing?

What is the important role of insulation resistance tester in testing?

Insulation resistance tester, also called megohmmeter, is used to check the insulation resistance of electrical equipment, household appliances or electrical circuits to ground and phases to ensure that these equipment, electrical appliances and circuits are working in a normal state to avoid electric shock, casualties, and equipment damage. accident.

 2021-02-23

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How does the loop resistance tester perform the synchronization and timing control of the digital power supply?

How does the loop resistance tester perform the synchronization and timing control of the digital power supply?

The loop resistance tester is a special instrument for measuring the contact resistance and loop resistance of switch control equipment. The test current adopts 100A DC recommended by my country's standard GB763. It can be directly used in the case of 100A, 200A, 300A, 400A, 500A or 600A. Measure loop resistance or contact resistance.

 2021-02-23

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For more operation videos, please pay attention to the public number of Zhongce.

For more operation videos, please pay attention to the public number of Zhongce.

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