Features:_x000D_ _x000D_ Input power is DC 3.3-30V, recommended power supply is 12-24VDC. _x000D_ Input power supply, product can generate 4-20mA current output by manual adjusting potentiometer, used for current analog quantity 4-20mA output. _x000D_ Output current can be constant automatically at setting value according to adjustment; it can also be used as a constant current source of which the maximum output current should not exceed 20mA. _x000D_ Universal power supply of module, can be used for PLC, frequency converter, servo. _x000D_ Module power consumption current is less than 30mA, supports for general equipment. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Type: Current generator_x000D_ Model: 4-20mA_x000D_ Potentiometer Installation Hold Diameter: 10mm_x000D_ Size(L*W*H): 73*54*30mm/2.9*2.1*1.2in_x000D_ _x000D_ Hole Spacing: 61mm/2.4in _x000D_ Suitable Screws: M3 (NOT included) _x000D_ Weight: 74g(approx.) _x000D_ Wiring: _x000D_ 3-32V: DC power supply positive_x000D_ GND(left): Power supply negative _x000D_ GND(right): 4-20mA output current negative_x000D_ 4-20mA-OUT: 4-20mA output current positive_x000D_ _x000D_ Potentiometer: Adjust output range of 4-20mA, clockwise to increase, counterclockwise to reduce _x000D_ _x000D_ _x000D_ Instruction: _x000D_ About Output Impedance Matching:_x000D_ Output signal resistance must meet the following requirements_x000D_ According to the formula:I=U/R(current = voltage/resistance)_x000D_ So the maximum current that signal receiving end can generate is equal to dividing power supply voltage by signal resistance._x000D_ In this way, current generator still has some resistance._x000D_ Thus concludes to a formula:_x000D_ Power supply voltage/(signal internal resistance + current generator internal resistance) = output constant current_x000D_ 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._x000D_ Signal matching requirements is given below:_x000D_ For 24V power supply, signal resistance shall not be greater than 1000 ohms._x000D_ For 12V power supply, signal resistance shall not be greater than 500 ohms._x000D_ For 5V power supply, signal resistance shall not be greater than 200 ohms._x000D_ If your signal resistance is greater than the above parameters, you can improve the power supply voltage or reduce internal resistance, to ensure a enough constant current source.Note that the power supply voltage cannot be more than 32V._x000D_ This module can be used for PLC, frequency converter, servo; and when using these products, the module's voltage should match your interface. If you are not sure, you can try 5V first, then 12V or 24V power supply. Under the condition of normal function, use low voltage as far as possible.There is another way:In general, PLC, frequency converter, or server has a COM +, COM - power output interface, power supply can be directly from here._x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Signal Generator