Besides high voltage testing, other examinations can be performed, among them measurements of conventional and UHF partial discharge (PD) radio interference voltage (RIV), measurements of dissipation factor and capacity, and rain tests. If required, monitoring camera systems and microscopes are used. In addition to the high voltage testing, the open-air testing area permits long-term insulation testing under DC and AC to simulate aging processes. The large test halls of the high-voltage testing laboratory are shielded. This makes sensitive PD measurements with a very low noise level of less than 1 pC possible. The high-voltage testing laboratory also permits tests for switching of bus-charging currents by GIS disconnectors. Furthermore, surge current test circuits for surge arrester tests are available
