Reference : SIG-1227-01-07
Change Note : CN0112
spYdaq Hardware Manual
Page
10
of
36
4.5 Connecting the sensor
Having selected an appropriate sensor it then needs to be wired into the PCB as
follows:
Note 1.
4 to 20mA input has an internal impedance of approx 120ohms. The impedance stated
includes the resistance of a series current limiting PTC.
The maximum voltage drop across the spYdaq input is 3V @ 25mA.