Power grating switch and gain multiplexing switch (ON/OFF) / (x10/x1/OFF): Three-terminal toggle switch; when the OFF terminal stops working, ON (x1) will occur on one end; when the instrument is powered on successfully, ON (x10) will occur on one end; Channel 3 gain can be selected simultaneously.

Power input: USB and 5 V power adapter are available in two ways (they cannot be used simultaneously).

Signal input channel (CH2B IN): DB9 port for use with a dual-power supply preamplifier