Data Sheet

Proteus VSM
237
To begin with place a DC Sweep graph on an unused space on the schematic. Then tag the
U1(POS IP) probe and drag it onto the left of the graph. We need to set the sweep value, and
this is done by editing the graph (right click - edit properties). The Edit DC Sweep Graph
dialogue form includes fields to set the swept variable name, its start and ending values, and
the number of steps taken in the sweep. We want to sweep the resistor values across a range
of say 100kW to 5MW, so set the Start field to 100k and the Stop field to 5M. Click on OK to
accept the changes.
Of course, the resistors R1 and R2 need to be altered to make them swept, rather than the fixed
values they already are. To do this, double left click on R1 to edit it, and alter the Value field
from 470k to X. Note that the swept variable in the graph dialogue form was left at X as well.
Click on OK, and repeat the editing on R2 to set its value to X.