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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.

Check for dead pixels on LCDs or "screen burn" on older analog CRT displays. Top Used Models for Hobbyists (2026) Based on current market availability and community favor: buy used oscilloscope

Look for a rate at least 2.5 to 10 times your bandwidth for accurate waveform representation. Connect a probe to every channel and attach

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