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4.2 The system stop button
This button toggles between the available gain options of the amplifier:
GAIN HIGH (x7)
Indicates a gain of seven. 1 V in will result in 7 V output
voltage.
GAIN LOW (x1)
Indicates a gain of one. 1 V in will result in 1 V output
voltage.
4.3 The CURRENT LIMIT LED
This LED indicates that the current limit has been reached.
4.4 The ERRORS LEDs
POWER FAIL
This LED indicates if any of the system voltage check fails.
It is blinking in case the power stage power supply unit
fails and it stays constant if the auxiliary supply fails.
