The VSP is a research grade potentiostat system in a 5-channel modular chassis. This allows the VSP to add additional capability in the way of plug-in “modules”.
These modules provide EIS capability (included on the potentiostat board), low current measurement (uses 1 additional slot), 4 A current booster (two slots) and additional potentiostat channels (each one takes one slot).
The internal 4A option takes two slots in the VSP chassis and requires a potentiostat board to be used with it. External boosters from 2 A up to 100 A can be used with each channel in the VSP.