This work shows a new system based in virtual instrumentation to calibrate electronic modules in blood pres-sure measurements obtained by oscillometric method. The system uses a computer, a data acquisition card and a signal conditioner circuit, and it sends different electric stimulus to evaluate the answers of electronic modules. The software verifies electronic modules and allows their calibration with a simple user's interface that controls the virtual instrument using the keyboard and the mouse; and the results of the measurements are visualized in the computers monitor.