Specifications:
Type: Current generator
Model: 4-20mA
Potentiometer Installation Hold Diameter: 10mm
Size(L*W*H): 73*54*30mm/2.9*2.1*1.2in
Hole Spacing: 61mm/2.4in
Suitable Screws: M3 (NOT included)
Weight: 74g(approx.)
Wiring:
3-32V: DC power supply positive
GND(left): Power supply negative
GND(right): 4-20mA output current negative
4-20mA-OUT: 4-20mA output current positive
Potentiometer: Adjust output range of 4-20mA, clockwise to increase, counterclockwise to reduce

Instruction:
About Output Impedance Matching:
Output signal resistance must meet the following requirements
According to the formula:I=U/R(current = voltage/resistance)
So the maximum current that signal receiving end can generate is equal to dividing power supply voltage by signal resistance.
In this way, current generator still has some resistance.
Thus concludes to a formula:
Power supply voltage/(signal internal resistance + current generator internal resistance) = output constant current
Our module power supply is 5-32V voltage, so if using low voltage power supply, and the signal internal resistance is large, the output constant current will not be enough.
Signal matching requirements is given below:
For 24V power supply, signal resistance shall not be greater than 1000 ohms.
For 12V power supply, signal resistance shall not be greater than 500 ohms.
For 5V power supply, signal resistance shall not be greater than 200 ohms.
Note that the power supply voltage cannot be more than 32V.

Package Includes:
1 x Signal Generator