How to use a multimeter to measure a 4-20mA sensor
There are two measurement methods:
1. Through the current range test of the multimeter, the steps are as follows:
The red probe of the multimeter is connected to the mA hole, and the black probe is connected to the COM.
Set the gear of the multimeter to DC mA.
The red probe of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black probe is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, and the reading is the current value.
2. Measure the current value through the voltage range of a multimeter. For a multimeter without current testing function, the current value can be
measured through voltage, as follows:
Connect a sampling resistor of approximately 100 ohms at the 4-20mA sensor output.
How to use a multimeter to measure a 4-20mA sensor
The red probe of the multimeter is connected to the mA hole, and the black probe is connected to the COM.
Set the gear of the multimeter to the DC V gear.
The red probe of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black probe is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, which is the voltage value. Divide the reading by the resistance value (such as 100 ohms) to obtain the current value.
Using the DC current function of the multimeter, select the 20mA gear (if not available, select the 100mA gear) and directly test the sensor output. If it is a desktop digital multimeter, you can also use any sensor function to directly test the physical quantity sensed by your sensor. Wiring method: connect the red lead to the green wire, and the black lead to the yellow wire
