A signal frequency measuring instrument is designed and manufactured. . .

Frequency meter is an electronic measuring instrument specially used to measure the frequency of the measured signal. Its basic working principle is that when the number of cycles of the measured signal in a specific time period t is n, the frequency of the measured signal is f = n/t.

The frequency meter is mainly composed of four parts: time base (T) circuit, input circuit, counting display circuit and control circuit. In a measuring period, the measured periodic signal is amplified, shaped and differentiated in the input circuit to form a narrow pulse with a specific period, which is sent to the input end of the main gate circuit. The other input end of the main gate circuit is the gate pulse generated by the time base circuit generation circuit. During the period when the door pulse opens the main door, a narrow pulse with a specific period can pass through the main door, thus entering the electric meter for counting. The display circuit of the instrument is used to display the frequency value of the measured signal, and the internal control circuit is used to switch between various measurement functions and realize the measurement setting.

applied range

1. In traditional electronic measuring instruments, the oscilloscope has low measurement accuracy and large error when measuring frequency. Spectrometer can accurately measure the frequency and display the spectrum of the measured signal, but the measurement speed is slow, so it can't track and capture the change of the frequency of the measured signal in real time. It is precisely because the frequency meter can quickly and accurately capture the change of the frequency of the measured signal, so the application range of the frequency meter is very wide.

2. In traditional manufacturing enterprises, frequency measuring instruments are widely used in production testing of production lines. Frequency meter can quickly capture the change of crystal oscillator output frequency, and users can quickly find faulty crystal oscillator products by using frequency meter to ensure product quality.

3. In the metrology laboratory, the frequency meter is used to calibrate the local oscillators of various electronic measuring equipment.

4. In the wireless communication test, the frequency meter can be used to calibrate the master clock of the wireless communication base station, and can also be used to analyze the frequency hopping signal and frequency modulation signal of the radio station.