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NSG 3040 EMC test system
The respective test screen looks like what follows:
14.3.2 Manual step transformer: INA 6501
The step transformer type INA 6501 is a standard accessory for the Schaff-
ner Modula 6100 instrumentation series. It provides a convenient means for
reducing the incoming supply voltage by pre-set amounts. It is required for
power quality testing (PQT) and is fully compliant with the latest revisions of
IEC 61000-4-11:2004.