How to find the right Oscilloscope Probes AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Oscilloscope Probes
- Probe bandwidth
- Probe bandwidth should equal or exceed the scope's bandwidth. The system bandwidth is limited by the slower of the scope and the probe.
- Attenuation setting
- Use 10x for general and fast signals. Reserve 1x for small, slow signals, since 1x bandwidth is typically only a few MHz. In 1x mode, cable capacitance loads the circuit and limits bandwidth.
- Compensation range
- The passive probe's compensation range must cover the scope's input capacitance. Compensate it on the scope's calibration output before use. An uncompensated probe distorts square waves and amplitude.
- Voltage and CAT rating
- For mains or floating measurements, use a high-voltage differential probe whose voltage and CAT ratings exceed the circuit's. Standard passive probes are ground-referenced and not suitable for floating nodes.
- Ground connection length
- Use the short ground spring instead of the long alligator lead for fast edges. Long ground leads add inductance that causes ringing and false overshoot.
- Current measurement
- Choose a current probe whose range and bandwidth fit the job. AC-only clamps cannot show DC current. The probe type determines whether DC components are visible.
Brands that matter
- Tektronix: Reference-grade passive, active and current probes.
- Keysight: Professional probes matched to InfiniiVision scopes.
- Rigol: Bundled and replacement passive probes for its scopes.
- Siglent: Passive and differential probes for its scope lineup.
- Micsig: Known for high-voltage differential and current probes.
- Pico Technology: Probes and accessories for PC-based scopes.
What to avoid
- Unbranded probes that list no bandwidth or compensation range.
- Using a passive probe's ground clip on a floating or mains-referenced node.
- Mixing probes rated well below your scope's bandwidth.
Questions
Do I need my scope brand's own probes?
Standard passive BNC probes are interchangeable if the bandwidth and compensation range match. Active probes often need the manufacturer's proprietary interface.