How to determine whether the sensor outputs a current or voltage signal-EEWORLD

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The characteristic of a voltage source is that the voltage value output by the power supply does not change with the load.

No matter how large the load resistance connected to the power supply is, the voltage output by the power supply is a constant value.

The characteristic of a current source is that the current value output by the power supply does not change with the load.

That is, no matter how large the load resistance connected to the power supply is, the current output by the power supply is a constant value.

For a sensor, when the physical quantity measured by the sensor is fixed, if it is a voltage signal output and the load resistance is within its nominal specification range, its voltage value is a fixed value.

If the output is a current signal, the load resistance is within its nominal specification range and the current value is a fixed value.

How to determine whether the sensor outputs a current or voltage signal

For example, the temperature sensor measures a temperature range of 0-100 degrees.

If the voltage output is 0-10V, when the temperature is 50 degrees, the output voltage is 5V.

At this time, a 1K ohm resistor is connected between the output terminal and the ground, and the output voltage measured between the output terminal and the ground is 5V.

When the resistor connected between the output terminal and the ground is changed to 2K ohms, the output voltage measured between the output terminal and the ground is still 5V.

The output current has changed from 5mA to 2.5mA.

If the current output is 4-20mA, when the temperature is 50 degrees, the output current is 12mA.

At this time, a 100 ohm resistor is connected between the output terminal and the ground, the output current measured between the output terminal and the ground is 12mA, and the output voltage measured is 1.2V.

When the resistor connected between the output terminal and the ground is changed to 200 ohms, the output current measured between the output terminal and the ground is still 12mA, and the measured output voltage becomes 2.4V.

Therefore, if you cannot find the instruction manual or nameplate, confirm the output signal type from the instruction manual and nameplate.

You can use an adjustable resistor with an adjustable range of about 0-510 ohms, connect the adjustable resistor between the output end of the sensor and the ground, and use the DC voltage range of the multimeter to measure the voltage between the output end and the ground. Adjust the adjustable resistor to 100 ohms, measure the voltage value, and then adjust the adjustable resistor to 200 ohms, and measure the voltage value again. If there is a significant difference in the measured direct voltage value before and after the adjustable resistor is adjusted, it means that it is a current signal output, otherwise it is a voltage signal output.

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