|If the product of input amplitude and gain exceeds the
maximum design, the output amplitude will saturate or limit and produce a
distorted output with a flat top at the amplitude at which the saturation
The gain contains two controls - a coarse gain and a fine gain. The
coarse gain is firstly used to find the crude range and then the fine gain
is altered to find the accurate value to produce the optimum peak height.
the gain controls to their maximum values to observe saturation.
The ideal response of an MCA, showing ADC zero off-set
and the effect of increasing the gain of the amplifier (Click for larger image)