A drawing of the Femto DLPCA200 variable gain low noise current amplifier used in my scanning tunneling microscope. The model is made in auto desk inventor and rendered using inventor studio. Almost all of the parts in the assembly are custom,based on the Femto drawings available on the data sheet. I could not find good models for the LEMO plug, or the BNC, so I made them myself. I did not model the interior, as I have never opened it. There is an empty space inside the box for the model, however.
I use the amp at 10^9 gain with full bandwidth (1kHz). It is run in low noise “L” and DC mode (those switches are all very important to check).
The drawing is not complete. It needs the rest of the art on the face and it needs the large connector for the digital inputs.
This is a great amplifier, by the way. I have used it to tunnel at about 4pA (4e-11 A).