Hey Forum
I have a device that hasa a very high output impedance (less then 2000 MOhms). I want to interface it to a PLC. My understanding of a high output impedance is that it is a very poor current source?? Therefore i would need to connect it to a low input impedance??? How would i decide that the PLC has a low enough input impedance (1Mohm)?? If it wasn 't what op-amp would give me a high enough input impedance??
How do i calculate approxiamtely or intutively what sort of op-amp or op-amp configuration i would need (eg voltage follower)??
How
Thanks
Michael
I have a device that hasa a very high output impedance (less then 2000 MOhms). I want to interface it to a PLC. My understanding of a high output impedance is that it is a very poor current source?? Therefore i would need to connect it to a low input impedance??? How would i decide that the PLC has a low enough input impedance (1Mohm)?? If it wasn 't what op-amp would give me a high enough input impedance??
How do i calculate approxiamtely or intutively what sort of op-amp or op-amp configuration i would need (eg voltage follower)??
How
Thanks
Michael