©
National Instruments Corp.
13
NI 9426 Operating Instructions and Specifications
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
eq
u
ipment, limited-energy parts of eq
u
ipment, circ
u
its powered by
reg
u
lated low-voltage so
u
rces, and electronics.
Caution
Do
not
connect the NI 9426 to signals or
u
se for
meas
u
rements within Meas
u
rement Categories II,
III, or IV.
