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
2,001 m to 5,000 m altitude
Continuous
60 VDC, Measurement
Category I
Withstand
1,000 VDC
Division 2 and Zone 2
hazardous locations
applications (Channel-to-
channel and channel-to-
earth ground)
60 VDC, Measurement
Category I
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
4
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NI 9238 Getting Started Guide
