The 1:1 probe is characterized by applied to the input of the oscilloscope or the same voltage waveform is applied to the probe tip. The 10:1 probe to the oscilloscope delivers only a tenth of the voltage applied to the probe tip. 10:1 probes can allow the oscilloscope to observe voltages ten times higher than the capacity. For example: An oscilloscope allows reading voltages 50V with 1:1 probe, with 10:1 probe can measuring voltages up to 500V (10x50V). There are probes that has a button where you can select 10:1 or 1:1.
Note: When there is no complete certainty the magnitude of stress involved is advisable to start the measurement with the position 10:1.
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