Channel-to-earth ground isolation
Up to 2,000 m altitude
Continuous
250 Vrms, Measurement
Category II
Withstand
3,000 Vrms, verified by a 5 s
dielectric test
Up to 5,000 m altitude
Continuous
60 VDC, Measurement
Category I
Withstand
1,000 Vrms , verified by a 5 s
dielectric 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.
4
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NI 9224 Getting Started Guide
