3dB bandwidth is the frequency at which a input signal is attenuated by 3dB and which is 70.71% of the signal true amplitude. So this means that at its specified bandwidth the device can show as little as 70.71% of the actual amplitude of the signal. This can be measured by simply using the function generator and feed the since wave frequency into the system and then monitor it with oscilloscope then take the output voltage from the oscilloscope using the formula show here to calculate the gain. So we do this by increase the frequency gradually until the response drop to 3dB which is 70.71%. The whole process of measuring this taking a lot time because we need to do different value of frequency until we found the point that drop to 3dB.
Gain = 20 x Log10 (Vout/Vin)
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