Every amplifier has its own specific signal characteristic depending on the type of the low-pass, the type of the high-pass filter, the type of the op-amps used and so on. The different types of the circuits and components can cause different signal forms and different time delays. This is the main reason why we strictly recommend that all users should exclusively use the same amplifier circuits, in particular, one of our recommended amplifier circuits. Wrong time stamps can considerably confuse our calculations. Finding the reason for false calculations can be very time consuming.

System BLUE has two pre-amplifiers, the H-filed pre-amplifier 16.x, and the E-field pre-amplifier 17.x.