what are the functions of different probes used in CRO?

Direct Probe: direct probe avoids stay-pick up which may create problems when low level signals are being measured. It is used for low freuency or low impedance circuit.
Isolation probe: Isolation probe is used in order to avoid the undesirable circuit loading effects of the shielded probe.

Detector probe: when analyzing the response to modulated signals used in Communications equipment like AM, FM and TV receivers, the detector probe functions to separate the low frequency modulation component from the high freuency carrier.

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