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Deeper memory allows you to capture longer time windows while maintaining a high sample rate, which is crucial for finding intermittent glitches.

When looking for a used unit, prioritize these specifications based on your needs: buy used oscilloscope

Connect a probe to every channel and attach it to the built-in probe compensation output (usually a small metal tab on the front). You should see a clean, steady square wave. Deeper memory allows you to capture longer time

This determines the highest frequency signal you can measure. For general hobbyist work, aim for at least 50–100 MHz . buy used oscilloscope