Which of the following is good practice when using an oscilloscope probe?
Minimize the length of the probe's ground connection✓Correct answer
Never use a high-impedance probe to measure a low-impedance circuit
Never use a DC-coupled probe to measure an AC circuit
All these choices are correct
Explanation
The inductance of the probe's ground lead resonates with the probe and input capacitance, so a long ground connection adds ringing and overshoot to fast edges, and keeping it short is the standard practice. The two prohibitions are false: high-impedance probes are routinely used on low-impedance circuits, and a DC-coupled probe measures AC perfectly well.