weird waveform

[analog123]

HI

I used waveform generator to produce a simple square wave, as in pic1.  I connected the w1 to Ch1 for scope visualization, and I saw RC decay trace instead of a square wave. 

Could you advise what went wrong?

waveform to generate:

sampled by the scope:

thank you,

 

[Anthocyanina]

are you using the bnc adapter and bnc probes? if so, you should compensate the probes by tweaking the capacitor on them until the signal looks square. your signal looks like a very uncompensated probe

Edited December 20, 2023 by Anthocyanina

[attila]

Hi @analog123

The BNC adapter is in AC coupling. Set it to DC behind the BNC connector.

[analog123]

thank you. it solved the problem. May I ask what circumstances the J2, J3 should be set to AC on the connector board? what are J4, J5 for?

[attila]

See the following:

https://digilent.com/reference/test-and-measurement/bnc-adapter-board/reference-manual

https://digilent.com/reference/test-and-measurement/bnc-adapter-board/getting-started-guide