NI 9401 Operating Instructions and Specifications 16 ni.com
Safety
Maximum Voltage1
Connect only voltages that are within the following limits.
Channel-to-COM.............................. ±30 V max on one channel
ata time, Measurement
CategoryI

Isolation Voltages

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
1 The maximum voltage that can be applied or output between any channel and COM
without damaging the module or other devices.