How to understand bandwidth in oscilloscope indicators
Bandwidth is a base indicators for oscilloscope,the same as amplifier bandwidth,it is called -3dB point,which is input sine wave at oscilloscope,the frequency amplitude is reduced to 70.7% of the actual amplitude is called the bandwidth.In other words,if you measure 1V 100M sine wave and use 100M bandwidth oscilloscope,the amplitude just have 0.707V,it is for sine wave situation.so when we choose oscilloscope,in order to reach measure accuracy,that should choose maximum signal frequency is 5 times the bandwidth
