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Multi-channel safety test (the advantages and disadvantages of AC and DC testing)

Please first determine whether the corresponding safety unit allows the tested product to use AC voltage or DC voltage, and it should be tested as required. Some products can be tested with AC voltage or DC voltage. Then the manufacturer can decide to use AC voltage test or DC voltage test according to the characteristics of the product. The user must understand the advantages and disadvantages of these two test voltages.

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.

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:

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.

Contact Info

Address: Room 420, Building 3, No. 18, Huashan Road, Changzhou, Jiangsu, China
Sales:086519-8513 9371
Fax: 0519-85120128 to 8017
Mailbox:sales@zctek.com.cn

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