For very high voltage discharges, such as might be required to meet military specifications or for special applications, the NSG 432 ESD simulator system from Schaffner can be used to generate electrostatic discharges up to 25kV. The NSG 432 is a compact, hand-held instrument, with a range of high voltage discharge networks for testing to various standards, including IEC 61000-4-2. The high voltage discharge network appropriate to a particular application is simply fitted on to the lightweight, robust housing. A multi-turn potentiometer is used to set the discharge voltage, which is then clearly displayed on an LCD and a toggle switch sets the operating mode to single pulse or repetitive 20Hz pulsing. The pulse trigger is built into the hand grip.