I'm trying to measure the on-off control signal from a NPN open collector output using a data recorder, but I'm not getting a correct waveform.
我想用記錄儀測量NPN集電極開路輸出的ON/OFF信號，但是無法觀測到正確的波形。
Cindy
Could you describe the problem in more detail.
能具體描述一下問題嗎？
王工
There is no on-off square wave and the wave keeps fluctuating at zero volt. Could there be something wrong with the wiring?
看不見ON/OFF的矩形波，總在0 V附近波動。
是不是配線有問題？
Cindy
That could be the problem. If the NPN open collector output is not connected to any other equipments, you need a load resistor and an external power supply.
可能是這個問題。如果NPN集電極開路輸出沒有連接到其它機器上，就必須使用負載電阻及其外部電源。

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