Test method for sensor output

Create Date: 2024-8-30 12:03:23|Source: P+F/Double Blessing

1. Test for NPN output sensor

The NPN sensor output, also known as OC gate output, is based on the principle of open collector output of a transistor.

The principle of NPN type OC gate output is whether the output of the NPN transistor and GND are short-circuited. When the triode is turned on, the output and GND (power supply negative) are short-circuited, and when the operation is invalid, the output is open to GND, which is equivalent to a suspended condition. When the output terminal is directly tested with a multimeter, when the triode conduction measurement voltage value is about 0V, when the tertiary tube is not conducted, the measured voltage is equivalent to the open circuit voltage, this voltage will have some fluctuations, and can not fully prove whether the sensor output is normal or not. The correct and abbreviated test method is to pull a 10K resistor on the output to the power supply and measure the output voltage at this moment.

After the 10K resistor is pulled up to the power supply voltage, the output voltage value of the NPN triode is 0V-0.7V when the NPN trio is turned on, and the measured output voltage is generally VCC-1V-VCC when the tertiary transistor is turned off.

Note: The NPN output cable should not be directly touched with the VCC (positive power supply) at any time, otherwise the output switch will be short-circuited and burned.

Test method for sensor output

Second, for the PNP type output sensor test

The output of PNP sensor can be directly measured with a multimeter, when the sensor is not output, the voltage should be 0V, and the output voltage is VCC-1V-VCC.

Note: The PNP output cable should not be directly touched with the GND (negative power supply) at any time, otherwise the output switch will be short-circuited and burned.

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