ESCO Technologies ETS Lindgren 3301B, User Manual

Page: 32 / 56

32 | Theory of Operation
high. However, the amplifier is being called upon to amplify signals at many
frequencies simultaneously. In the time domain, the amplifier would be seen to
be presented with quite a large power demand. The result is that impulsive
signals appear to saturate the amplifier at must lower signal levels. The
Model 3301B has been measured to begin going non-linear at 64 dBuV/m/MHz.
A saturation indicator is provided on the unit. This indicator will eliminate many
false readings due to non-linear operation. The saturation indicator has been
carefully tested to give an accurate, early warning of possible saturation.
However, some types of impulse signals may not trigger the indicator. The user
must, therefore, be careful to observe the published limits. Should these be
exceeded, the internal attenuation provided would relieve the problem.