Crystal Frequency Measurement

（Passive crystal frequency measurement）

While connecting the circuit board and powering on, the passive crystal oscillator frequency test steps are as follows:

· Use the Oscilloscope or cymometer to test the truth output frequency after Power on the circuit board

· According to the difference between the truth output frequency and standard frequency, calculate the Stray capacitance

· According TS curve, work out the load capacitance of quartz crystal.