There are generally two possibilities
It mainly depends on what the basic gear of this beep gear is.
If the basic gear is resistance, then its judgment is based on measuring resistance. If it is less than a certain value, the buzzer will sound. If the resistance is too high, it will not sound, and the value will be displayed.
If the basic gear is the diode gear, then the basis of judgment is the voltage drop, and the value is the voltage. Generally, it will sound when it is lower than 0.3V, and it will not sound when the voltage drop is high.
