Basically,
Ohms law is used to calculate a resistor value in order to convert the 0-20ma signal to a voltage.
Current to Voltage Conversion Circuit Diagram
Example (0-20 mA to 0-10 VDC)
Ohms law states: R = V/I where V is the Voltage, I is the current and R is the resistance
R = 10V/0.020A = 500 Ohms
0-20 mA to 0-10 VDC Conversion Circuit Diagram
V = I*R = 0*500 = 0V
V = I*R = 0.020*500 = 10V
Example (4-20 mA to 2-10 VDC)
Ohms law states: R = V/I where V is the Voltage, I is the current and R is the resistance
R = 10V/0.020A = 500 Ohms
4-20 mA to 2-10 VDC Conversion Circuit Diagram
V = I*R = 0.004*500 = 2V
V = I*R = 0.020*500 = 10V
Example (0-20 mA to 0-5 VDC)
Ohms law states: R = V/I where V is the Voltage, I is the current and R is the resistance
R = 5V/0.020A = 250 Ohms
0-20 mA to 0-5 VDC Conversion Circuit Diagram
V = I*R = 0*250 = 0V
V = I*R = 0.020*250 = 5V
Convert 0-10 VDC to 0-20 mA Using Resistor
Note:-
To avoid damage you must ensure that the external current source has
short-circuit protection in all conductor cases.
The external resistor is a source of error because of its dependency on
temperature and its inaccuracy.
In order to obtain measuring results that are as precise as possible it is
recommended to use resistors with tolerances that are as small as possible.
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