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.
(TS curve)
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