©
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
u
p to
8 channels at a time,
Meas
u
rement Category I
Isolation
Channel-to-channel .................... None
Channel-to-earth gro
u
nd
Contin
u
o
u
s ........................... 60 VDC,
Meas
u
rement Category I
Withstand ............................. 1,000 V
rms
, verified by a 5 s
dielectric withstand test
Meas
u
rement Category I is for meas
u
rements performed on
circ
u
its not directly connected to the electrical distrib
u
tion system
referred to as
MAINS
voltage. MAINS is a hazardo
u
s live electrical
s
u
pply system that powers eq
u
ipment. This category is for
meas
u
rements of voltages from specially protected secondary
circ
u
its. S
u
ch voltage meas
u
rements incl
u
de signal levels, special
