“So, the pressure in her abdomen had gotten so high that it offset the pressure in her head, and the shunt no longer worked,” said Dr. Beaumont. Dr. Beaumont had to put in an external shunt to ...

Again, to measure currents larger than the full-scale deflection current (analog meter) or those currents beyond the range of the built-in shunts of a digital meter, external shunts must be employed.