Pulse output EMDIN01

Good morning,

I am trying to read the pulse ouput signal from this instrument but although the led is blinking I am not able to see any pulse on the oscilloscope. Is there any impedance adaptation I must be aware of? Or any This is the second module I have tried so I would discard malfunction on the unit.

Regards, Álvaro

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Hint: the output of such device is an open collector, so you will not see any pulses, unless you apply a voltage trough a series resistor.