4-20ma Signal generator current generator constant current source hand digital display analog generator
Description
- Three, about the 4-20MA current generator output impedance matching problem The internal resistance of the output signal must meet the following requirements According to the formula: I=U/R (current = voltage divided by resistance)
- So your power voltage divided by your signal internal resistance is equal to the maximum current you can generate at the receiving end of your signal. In addition, our current generator has a certain internal resistance. Thus a formula is derived:
- Supply voltage / (signal impedance of the customer + internal resistance of our current generator) = constant current output. Since the power supply of our module is 4-35V voltage, if the supply voltage is low and the internal resistance of the customer is larger, the constant flow generated by the module will not be enough.
- Here is a signal matching requirement for our module: 24V power supply, the signal impedance shall not be greater than 1000 ohms. 12V power supply, the signal impedance shall not be greater than 500 ohms. 5V power supply, the signal impedance shall not be greater than 200 ohms.
- If the internal resistance of your signal is greater than the above parameters, you can improve the supply voltage or reduce the signal internal resistance of these 2 ways to solve the current source of the constant current supply problems. It should be noted that the supply voltage can not be increased to over 28V
Product Description: 1, simple and easy to use, convenient wiring, knob operation, adjust the response immediately after the output, without delay. 2 , the power voltage range is wide: the input power is DC 5-28V DC, and the power supply is recommended as 12-24V DC. 3, protection function is perfect: with input voltage reverse connection protection, power supply reverse, this instrument does not work, will not be burned because of reverse connection. 4, the standard current output range: through manual adjustment of products potentiometer, can produce 4-20MA current output, for the current analog output 4-20MA occasions. 5, the current regulation is very stable: the use of wire wound potentiometer to adjust the current, smooth adjustment, to avoid the general carbon film potentiometer often produce resistance, mutation and other faults. 6, with current meter, accurate display. 7 、with dial dial, it can quickly locate and recognize the running state of the equipment according to the scale. 8, you can fix the current output value: the output current can be adjusted automatically according to the customer's constant, at the set point, can also be used as a constant current source, as a constant current source, the current output is maximum not more than 20MA. 9, the body gold ratio, easy to grip, will work into a kind of enjoyment. 10, the test output is normal, you can use the multimeter (DC current) short access to "current positive and negative current" terminals, compare the display value and multimeter reading is consistent. 11 、 products can be used for: signal source generation, valve adjustment, frequency converter control, PLC debugging, instrument testing, LED test, analog transmitter output.
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