There are two special types of high impedance passive probes. One is a high-voltage probe, the attenuation ratio up to 100: 1 or 1000: 1, so the measurement voltage range is large; another is a type of 1: 1 probe, i.e., there’s no attenuation of the signal when input the oscilloscope. Not like 10: 1 probe which need the oscilloscope to enlarge the display, so the noise of the oscilloscope itself is not amplified, and the measured of noise will be much smaller, which use a lot in the small signal and power ripple measurement.
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