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2 Copy edited (e.g. ref. <https://en.wiktionary.org/wiki/occur#Verb>, <https://en.wiktionary.org/wiki/resistance#Noun>, <https://en.wiktionary.org/wiki/disappear#Verb>, and <https://www.youtube.com/watch?v=1Dax90QyXgI&t=19m05s> ). Removed meta information (this belongs in comments).

In my analogue output circuit, ocurrs the following ripple voltage occurs when wired to the analogue input of a PLC with an input resistenceresistance of 69.3K3 kΩ. If, I put a resistor in serieseries, this ripple dissapeardisappears.

Why that is that? Is ait an impedance problem?

The schematic of the circuit is the next: Thanks for your help!! Regards. In my analogue output circuit, ocurrs the following ripple voltage when wired to analogue input of PLC with input resistence of 69.3K. If, I put a resistor in serie, this ripple dissapear.

Why that is? Is a impedance problem?

The schematic of circuit is the next: In my analogue output circuit, the following ripple voltage occurs when wired to the analogue input of a PLC with an input resistance of 69.3 kΩ. If I put a resistor in series, this ripple disappears.

Why is that? Is it an impedance problem?

The schematic of the circuit is the next: Became Hot Network Question
1

# LM324 - Issue with output in negative feedback

In my analogue output circuit, ocurrs the following ripple voltage when wired to analogue input of PLC with input resistence of 69.3K. If, I put a resistor in serie, this ripple dissapear.

Why that is? Is a impedance problem?

The schematic of circuit is the next: 