NI 9425E Operating Instructions and Specifications
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© National Instruments
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11
Isolation Voltages
Channel-to-channel........................... None
Channel-to-earth ground
Continuous ................................. 60 VDC,
Measurement Category I up
to 5,000 m altitude
Withstand
up to 2,000 m altitude .......... 1,000 V
rms
, verified by a 5 s
dielectric withstand test
up to 5,000 m altitude .......... 500 V
rms
, 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.
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