© National Instruments Corp. 21 NI 9201/9221
NI 9201/9221 with DSUB Isolation Voltages
Channel-to-channel...........................No isol ation between
channels
Channel-to-earth ground
Continuous................... ..............60 VDC,
MeasurementCategory I
Withstand....................................1,000 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9201/9221 with DSUB to
signals or use for measurements within Measurement
CategoriesII, III, or IV.