For very high voltage discharges, such as might be required to meetmilitary specifications or for special applications, the NSG 432 ESDsimulator system from Schaffner can be used to generate electrostaticdischarges up to 25kV. The NSG 432 is a compact, hand-held instrument,with a range of high voltage discharge networks for testing to variousstandards, including IEC 61000-4-2. The high voltage discharge networkappropriate to a particular application is simply fitted on to thelightweight, robust housing. A multi-turn potentiometer is used to setthe discharge voltage, which is then clearly displayed on an LCD and atoggle switch sets the operating mode to single pulse or repetitive20Hz pulsing. The pulse trigger is built into the hand grip.