Finding the best 4-20ma signal generator suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.
Reviews
1. DROK Adjustable Current Voltage Analog Simulator, 0-20mA Signal Generator, DC 0-10V 4-20mA Changeable Current Source for Valve Adjusting PLC Panel LED Testing, Transmitter Output Simulation
Feature
AMP & VOLT DUAL SIGNAL GENERATOR: Multifunctional DROK signal generator kit is able to generate ampere & voltage by one module, which generate 0/4 - 20mA current signal and 0-10V voltage signal just by rotating a multi-cycle precise potentiometer, simple and handy.CLEAR LED DISPLAY: Our generator has bright and clear 3-digit LED digital display screen, which can be used to monitor the output current and voltage. You just need to push the switch below the monitor easy to switch the display.
AMP & VOLT DISPLAY CALIBRATION: There are current and voltage display calibrating potentiometer on the back of the module. If the display is accurate, you can calibrate the display value of current voltage by yourself.
WIDE APPLICATION: Our signal adapter can be used as signal generator, valve adjustment, inverter control, PLC debugging, panel debugging, LED testing, simulating the output of transmitter.
Description
Product Features:By rotating a multi-cycle precise potentiometer, this product can generate 0/4 - 20mA current signal and 0-10V voltage signal,
which can used as signal generator, valve adjustment, inverter control, PLC debugging, panel debugging, LED testing, simulating the output of transmitter.
Product Parameters:
Working voltage: DC24V
Input signal: Potentiometer
Output signal: 0/4-20mA or 0-10V
Display accuracy: Current: 0.1mA; Voltage: 0.01V
Dimension: 100*68*38mm
Debugging Procedures:
A. Current display calibration
Clockwise rotating the multi-cycle potentiometer to the maximum, switching the display switch to the right and then using a multimeter to test the actual value of the output current.
At this time, you can adjust the current display adjusting potentiometer to make the display value equal to the actual output value.
B. Voltage display calibration
Clockwise rotating the multi-cycle potentiometer to the maximum, switching the display switch to the left and then using a multimeter to test the actual value of the output voltage.
At this time, you can adjust the voltage display adjusting potentiometer to make the display value equal to the actual output value.
Package Includes:
1* Signal Generator
2. 4-20mA or 0-20mA current signal generator 9v battery operated calibrator
Feature
4-20mA or 0-20mA current signal generator / simulator(9 volt battery operated = portable)
Description
Here is one inexpensive and very handy tool for testing and simulating your 0-20mA or 4-20mA current loop in your control system. This will help you to do troubleshooting on any current loop signal device. Examples: PLC inputs, motor drives, I/P pressure regulators, flow control valves and list can go on... The most important thing; it is simple and easy to use. How many time has it happened to you when you were in a places where it takes some time and effort to get to and you don't have a way to test the device (e.g. VFD drive). With this device now you can. And the way it works it shows what current flows. If your circuit is broken (loop is not closed) then it will display zero. When loop is closed it will display how much flows through the circuit. In other words it is generator and meter in one unit. And what's good about it is that it's here in USA. You don't have to wait a month or more to get it for that low price! Specs: Works on 1(one) 9 volt battery (not included). You can get one at 99 cents store. Of course better quality battery will last longer. Full range of 0-20mA at load resistance of up to 250 ohms. This sale is for one unit only! We have them in different colors of the display; Red and Green. If you prefer any specific color of the display (Red or Green) please specify it in your order.3. DC 12V 24V 4-20mA Digital Signal Generator Module Board with 3 Digits LED Display
Feature
Easy to use and connect the wire, good performance.Knob operation, immediately after adjusting the response output, no delay.
The power port has polarity protection, will not damage the components with power reverse.
The test output is normal, you can use a multimeter shorted "4-20mA output" terminal.
Can be used for signal sources, valve adjustment, output meter test, the light emitting diode test, analog transmitter.
Description
Features:Easy to use and connect the wire, good performance.
Knob operation, immediately after adjusting the response output, no delay.
The power port has polarity protection, will not damage the components with power reverse.
Power supply voltage: DC 12V or 24V(tolerance 25%), total power<1W.
Output load impedance range: 0-350 ohms(DC12V); 0-800 ohms(DC 24V).
The test output is normal, you can use a multimeter shorted "4-20mA output" terminal.
Can be used for signal sources, valve adjustment, output meter test, the light emitting diode test, analog transmitter.
Specifications:
Power Supply: DC 12V or 24V
Current: 4-20mA
Total Power: <1W
Output Load Impedance: 0-350 ohms(DC12V); 0-800 ohms(DC 24V)
PCB Board Size: 50 * 50mm / 1.97 * 1.97in
Product Weight: 38g / 1.37oz
Package List:
1 * 4-20mA Signal Generator Module
4. Qianson DC 12V 24V 4-20mA Signal Source Signal Generator Constant Current Source 0.01mA With Polarity Protection
Feature
Easy to use, easy to wire, knob operation, in response to the output immediately after adjustment, no delay.In order to achieve stepless fine adjustment, particularly multi-ring (5 * 360) potentiometer to adjust the actual fineness of up to 0.01 mA, operate freely.
Power port has a polarity protection, power reverse does not work, do not burn components.
The power supply voltage: 12V DC or 24V (tolerance 1 25%), Total power <1W.
The product can be used: signal sources, regulating valves, control, test instrumentation, light emitting diode test, the inverter output analog transmitter.
Description
Features:
1, Easy to use, easy to wire, knob operation, in response to the output immediately after adjustment, no delay.
2, In order to achieve stepless fine adjustment, particularly multi-ring (5 * 360) potentiometer to adjust the actual fineness of up to 0.01 mA, operate freely.
3, Power port has a polarity protection, power reverse does not work, do not burn components.
4, The power supply voltage: 12V DC or 24V (tolerance 1 25%), Total power <1W.
5, 12V DC power supply, output load impedance range between 0-350 ohms; between 0-800 Ohm 24V DC power supply, output load impedance range.
6, The test output is normal, you can use a multimeter (DC current file) short "4-20mA output" terminal value and the comparison shows that the multimeter readings are the same.
7, The product can be used: signal sources, regulating valves, control, test instrumentation, light emitting diode test, the inverter output analog transmitter.
8, The header housing, easy to install, hole size: 76mm * 40mm. The overall size of 80mm*42mm.
Package included:
1x 4-20mA Signal Source Signal Generator
5. DROK 4-20mA Signal Generator, DC 5-28V Handheld Constant Current Analog Simulator, Stable Ampere Current Adjusting Module with LED Digital Amp Display for Frequency Converter Control, PLC
Feature
WIDE POWER SUPPLY VOLTAGE RANGE &STANDARD CURRENT INPUT RANGE: DROK digital signal generator kit is able to tolerate the widest input voltage range (DC 5-28V, recommended range DC 12-24V). By manually adjusting the potentimeter this generator can provide 4-20mA current output, which can be used in the application that needs.HIGH-ACCURACY ADJUSTING DESIGN: Our signal adapter is provided with current meter for you to check the output current and scale plate for you to distinguish the running state of the device immediately, which make your adjustment more accurate.
OUTPUT CURRENT VALUE CAN BE FIXABLE: According to your adjustment , the output current can be fixed to the set value automatically and can be used as constant current source. When it is used as constant current source, the max. output current cannot be more than 20mA.
PERFECT PROTECTIVE FUNCTIONS: This generator kit owns input voltage reversed connected protection. The product will not work when it is reversed connected, which effectively protect the product from burning.
WIDE APPLICATION: Our signal simulator can be used in various areas: signal generator, valve adjustment, frequency converter controlling, PLC testing, panel testing, LED testing, simulating the output of transmitter.
Description
Output Impedance Matching of 4-20mA Current Generator:The output source impendence should meet the following needs:
According to the formula: I=U/R (Current= Voltage/impedance), the voltage of your power supply divided by the signal impedance is the max. current that generated by the signal receiving terminal.
Besides, there is impedance with this current generator, so the formula should be the voltage of power supply / (the signal impedance of the device+ the impedance of the current generator)= output constant current
Since the voltage range of power supply of this product is 4-35V, if the practical voltage of the power supply is low and the impedance of the device is high, the product cannot provide enough constant current.
Here are the signal matching demands of this product:
When the power supply is 24V, the signal impedance cannot be more than 1000ohm.
When the power supply is 12V, the signal impedance cannot be more than 500ohm.
When the power supply is 5V, the signal impedance cannot be more than 200ohm.
If the signal impedance is higher than the above parameters, you can increase the voltage of power supply or decrease the signal impedance to solve the current shortage of the constant current source. Please note that the voltage of the power supply cannot be higher than 28V.
Package Includes:
1*4-20mA Signal Generator