ICP DAS USA PCI-1002L User Manual page 20

PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board

Figure 2-6: Differential input with floating signal source
A/D CH 0 HI
A/D CH 0 LO
A.GND
A/D CH n HI
A/D CH n LO
A.GND

Figure 2-7: Connecting to a 4 ~ 20 mA Source
AI CHn
AGND
Example: A 20 mA source current through a 125 Ω resistor (e.g. 125 Ω, 0.1% DIP Resistors) between
+ and – terminals and the board will read a 2.5 V
calculate what value the source current should have.
Current (I) = Voltage (V) / Resistance (R)
= 2.5 V / 125 Ω
= 0.02 A
= 20 m
Es 1
Es n
R
(Shunt Resistor)
voltage. You can use the I = V/R (Ohm's law) to
DC
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 19
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