Appendix D: Probe Basics
TekProbe Inte
rface
Probes with the TekProbe interface automatically communicate with the
oscilloscope to set the p robe type and attenuation factor. If you use a probe
without the T
ekProbe interface, you can set these parameters in the Vertical menu
for the channel that the probe is connected to.
Probe Guard
A guard around the probe body provides a finger barrier for protection from
electric shock.
Guard
WARNING. To avoid electric shock when using the probe, keep fingers behind
the guard on the probe body.
To avoid electric shock when using the probe, do not touch metallic portions of
the probe head while connected to a voltage source.
Ground Leads
Always use a ground lead when you probe a circuit to minimize noise pickup and
signal aberrations. Connecting the ground lead to a point near the signal source
usually provides the best results.
Long ground leads can cause false ringing and aberrations in the acquired
waveform that are not in the actual signal. To see the best signal fidelity, use the
shortest possible ground lead.
Short ground lead
Long ground lead
140 TDS3000C Series Oscilloscope User Manual
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