How to use a Kepco (BOP 20-10ML ) amplifier as AC amplifier. I 've been looking at the literature and I 've not found anything that explain to me. I'm trying to use a Function Waveform Generator model 33220A Agilent.
I need to get an output current of 100mA with 200Hz of frequency.

 

Help us out a little and post the relevant references. Datasheet/manual of the Kepco and the Agilent FG.

Besides that you haven't identified the load or the voltage or the waveform.

Are you really looking for a
1. "constant current" of 100 mA @ 200 Hz or
2. some voltage with a max of 100 mA of compliance.

We also have to look into how current is measured.

In terms of what you have said, I can't be sure what you want and I don;t feel like finding the references.
AC introduces too many things and it makes sense to specify those better.

 

Do you want to control current or voltage?

Page 3-2 of the manual shows a programming input for either voltage and current, whichever you want.

You should be able to directly connect your function generator to either of those inputs (but not both at the same time).