Measurement of Voltage
Plug the sensor into the slot #2 (by default) and press keypad "D0" to measure.

Remark: The voltage probes can measure voltage from 0 to 25.0V 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. You may press keypad "D*" and "D#" to select other types and ranges of voltage sensor, respectively (if available and inserted into the Slot#2).