The probe bandwidth should be as high as possible. The probe bandwidth is chosen to at least 10 times of CRO frequency. The probe bandwidth must be higher than the oscilloscope bandwidth. Therefore bandwidth of probes combines with the bandwidth of CRO. While connecting the test circuit, the probe does not alter, load or disturbs the circuit and signal conditions to be analyzed.Īny signal going to the oscilloscope will first pass through the probe. Oscilloscope Probes are a conducting wire which is used to establish a connection between the circuit under test and the measuring instrument.