Solartron Analytical Power Booster System EXTBOOST50V5A User Manual page 13

Booster User Guide
The reference electrode connections RE1 and RE2 enable measurement of the
voltage across the cell (or the part of the cell that is of interest), thus eliminating
from the measurements the ohmic drop due to the CE and WE cable connections.
To be able to interface directly with a potentiostat, and thus enable higher current
and voltages to be applied to the load, the booster has the internal structure
outlined in Figure 1-4. The
input by a factor of 10 and applies it to the load. The resulting current I
sensed by the current sense circuit, which outputs to the potentiostat a scaled
down current proportional to the current through the load. This determines the
current flowing at the input of the power booster such that I
load voltage across the sensing electrodes is 10 times that output by the
potentiostat, so a 1/10 divider scales this voltage down to the level compatible
with the reference inputs of the potentiostat. The net result is that the potentiostat
"sees" what is happening to the load, scaled down by given scaling factors. The
potentiostat control loop drives the booster input as though it were the load,
measuring and controlling as usual, while the load experiences 10 times the
voltage and 1000 times the current.
Figure 1-4 Block schematic of the power booster operation.
14906001_AA 12-09-07
amplifier multiplies the voltage applied to its
× × × × 10
Introduction
is
Load
= I /1000. The
Input Load
1-3