explain the procedure to test the probe with help of cro
Test probe
A high frequency oscilloscope presents a matched load ( usually 50 ohms ) at its input , which minimizes reflections at the scope . Probing with a matching 50 - ohm transmission line would offer high frequency performance , but it would unduly load most circuits . An attenuator ( resistive divider ) can be used to minimize loading . At the tip , these probes use a 450 ohm ( for 10 × attenuation ) or 950 ohm ( for 20 × attenuation ) series resistor . Tektronix sells a 10 × divider probe with a 9 GHz bandwidth with a 450 ohm series resistor . These probes are also called resistive divider probes , since a 50 ohm transmission line presents a purely resistive load .
A high frequency oscilloscope presents a matched load ( usually 50 ohms ) at its input , which minimizes reflections at the scope . Probing with a matching 50 - ohm transmission line would offer high frequency performance , but it would unduly load most circuits . An attenuator ( resistive divider ) can be used to minimize loading . At the tip , these probes use a 450 ohm ( for 10 × attenuation ) or 950 ohm ( for 20 × attenuation ) series resistor . Tektronix sells a 10 × divider probe with a 9 GHz bandwidth with a 450 ohm series resistor . These probes are also called resistive divider probes , since a 50 ohm transmission line presents a purely resistive load .