© National Instruments Corp. 15 NI 9403 Operating Instructions and Specifications
Safety
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM .............................. ±30 V max on up to
8 channels at a time,
Measurement Category I
Isolation
Channel-to-channel .................... None
Channel-to-earth ground
Continuous ........................... 60 VDC,
Measurement Category I
Withstand ............................. 1,000 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
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