Electret microphone tester
Product description
Electret microphone tester is mainly used for production measurement. The sensitivity and working current of the electret microphone at the two point frequencies of 1000Hz and 70Hz are selected. The sensitivity of 1000Hz and 70Hz is indicated by two Pointers of a double-pointer meter. The working current of the electret microphone is directly indicated by an ammeter. Because the electret microphone tester USES a double-pointer meter with a large open surface, it can easily and accurately read the voltage value of 1000Hz and 70Hz two point frequency, and quickly measure the performance of the electret microphone.
The instrument has the characteristics of easy to use, accurate test and fast speed. Especially suitable for electret microphone production line use.
Ii. Main technical indicators
1. Sensitivity test is divided into three grades: -60db ~ -40db; - 50 db ~ - 30 db; -40db ~ -20db (0db = 1V/Pa)
2. Test accuracy: ±0.5db (compared with the standard electret microphone)
3. Operating current range of electret microphone: 0 ~ 1mA accuracy 2.5%
4. Operating voltage of the supply electret microphone: 1.5v 2V 2.5v 3V 4.5v 6V accuracy ±2%
5. Electret microphone work load resistance: 680 Ω 1 K Ω 1.5 K Ω 2 K Ω 2.2 K Ω 3 K Ω accuracy + / - 1%
6. Test signal frequency: 1000Hz, 70Hz accuracy ± 1.5% ±1 word
7. The operating voltage of the instrument is 220V±5%/50Hz, and the power consumption is about 15W. It can work continuously at normal room temperature.
8. Caliber of standard microphone: 4mm 6mm 10mm