when should high z mode of oscilloscope be used to measure signals?

Published: 5/10/2017
when should high z mode of oscilloscope be used to measure signals?
Source: ELECTRONICS.STACKEXCHANGE.COM

My textbook says that high z mode allows the Vout to closely match Vin in value.(Is this impedance matching?) If this is the case, in what sort of scenarios should I be using a High Z mode vs. a 50ohm mode on an oscilloscope?

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