Safety Voltages
Connect only voltages that are within the following limits:
Vsup-to-COM
50 VDC maximum,
Measurement Category I
Isolation
Channel-to-channel
None
Channel-to-earth ground
Continuous
60 VDC,
Measurement Category 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.
NI 9478 Getting Started Guide
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© National Instruments
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