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How to measure crystal oscillator with oscilloscope _ oscilloscope to measure crystal oscillator correct method
An oscilloscope is an essential electronic measurement tool that converts invisible alternating electrical signals into visible waveforms, allowing users to observe and analyze them on a cathode ray tube or digital display. It plays a crucial role in digital circuit experiments, helping engineers and students visualize signal behavior, identify issues, and measure key parameters like voltage and frequency. The device typically includes components such as the oscilloscope itself, power supply, synchronization system, X and Y deflection systems, delay scanning mechanism, and a standard signal generator.
Oscilloscopes are widely used for analyzing AC or pulsed current waveforms. They consist of elements like a tube amplifier, scanning oscillator, and cathode ray tube. Beyond waveform observation, they can also measure signal frequency, amplitude, and other related characteristics. Any periodic physical process that can be converted into an electrical signal can be studied using an oscilloscope.
When it comes to measuring a crystal oscillator, it's important to use the correct technique. For example, a 200MHz oscilloscope can indeed test a 10MHz crystal oscillator, but if the waveform appears distorted, there may be an issue with the probe settings.
This distortion often occurs when using the ×1 probe setting. For instance, the ZDS1025S probe from the ZDS2000 series has a bandwidth of only 10MHz in ×1 mode, along with a high input capacitance of around 55pF±10pF. This can lead to waveform distortion, especially when testing higher-frequency signals.
To improve accuracy, switch the probe to the ×10 setting. In this mode, the bandwidth increases to 250MHz, and the input capacitance drops to about 13pF±5pF, resulting in a more accurate representation of the signal.
Here’s what the waveform looks like after adjusting the probe:
[Image: Correct crystal waveform]
Additionally, it's recommended to use the grounding spring that comes with the probe instead of the alligator clip for better performance and reduced noise interference.
When performing tests with an oscilloscope, always pay attention to both the oscilloscope settings and the probe configuration. Different probe settings affect the signal integrity, so choosing the right one is essential for accurate measurements. Proper setup ensures reliable data and helps avoid misleading results.