Remark: with the use of a shunt resistor of 1 ohm, the current probes can measure current from 0 to 5.0A without sign for its polarity. The red probe should connect to positive potential while the black proble should connect to the ground or negative potential. The default sensor is ACS712 which can measure current from -5A to 5A. You may press keypad "D*" and "D#" to select other types/ranges of and to calibrate the current sensor, respectively (if available and inserted into the Slot#3).
You must be careful to make a proper connection of the current sensors in series with a close circuit, e.g.
