National Instruments NI 9403 User Manual download pdf (Page 15)

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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National Instruments NI 9403 User Manual Page 15