There is also a small switch on the oscilloscope that selects the range: X10 and X1. When X1 is selected, the signal enters the oscilloscope without attenuation. When selecting X10, the signal is attenuated to 1/10 and then to the oscilloscope. Therefore, when using X10 of the oscilloscope, the reading on the oscilloscope should be expanded by 10 times (some oscilloscopes can choose X10 at the end of the oscilloscope to cooperate with the probe, so that after the end of the oscilloscope is also set to X10, the reading can be directly). When we want to measure the higher voltage, we can use the X10 function of the probe to attenuate the higher voltage and enter the oscilloscope. In addition, the input impedance is much higher on the X10 than on the X1, so the probe can be better measured on the X10 when testing signal waveforms with weak drive capability. But pay attention to, in the uncertain signal voltage level, should also be measured with X10 first, after confirming that the voltage is not too high and then choose the correct range of the range of measurement, it is necessary to develop such a habit, otherwise, one day in case of such damage to the oscilloscope, to regret it too late. Often someone asks, why to use oscilloscope to cannot see the wave form on crystal vibration pin?One possible reason is that the X1 of the probe is used, which is equivalent to a heavy load (an oscilloscope probe USES a capacitor of hundreds of pF in ×1) in parallel in the crystal oscillator circuit, causing the circuit to stop vibrating. The correct approach should be to use X10 of the probe.This should be noted in use, even if the vibration is not stopped, it is possible to change the oscillation conditions too much and not see the real waveform.