BK Precision frequency meter uses YXC crystal oscillator YSX321SL and HC-49US

Today we disassembled a BK Precision frequency meter made in the United States, model 1856D, 3.5GHZ bandwidth, LED display can provide up to 9 digits of resolution. The high precision and high sensitivity of the frequency meter are widely used in laboratories and frequency test equipment.

Does a passive crystal oscillator have a direction?

Passive crystal oscillators have no direction, and their pins have no positive or negative polarity.

Crystal Oscillator PPM Error Analysis and Calculation Method

Crystal oscillator accuracy is usually measured in PPM (Parts Per Million), which describes the frequency stability or deviation of a crystal oscillator. PPM represents the relative error between the actual output frequency and the nominal frequency, and is an important parameter for measuring the frequency accuracy of a crystal oscillator.

Application of crystal oscillator in "smart three meters"

Crystal oscillators can send stable and accurate clock signals, and play an important role in the circuit design of "smart three meters" (MCU, analog-to-digital conversion module, transmission module, etc.), ensuring the accuracy of data and the synchronization of communication. For example, the real-time clock RTC module must be equipped with a 32.768KHz crystal oscillator; the MCU main control module is generally equipped with 24MHz, 24.576MHz crystal oscillators, etc.

What does 30pf mean?

The crystal oscillator 30PF refers to the external capacitor 30PF. Generally, the maximum load capacitance option for a passive crystal oscillator is 20PF.

The crystal oscillator startup time is too long, hardware & software can be optimized together like this!

Use high-precision temperature-compensated crystal oscillators (TCXOs), which not only have better temperature stability, but also usually have shorter start-up times.