©
National Instruments Corp.
23
NI 9478 Operating Instructions and Specifications
Safety
Maximum Voltage
1
Connect only voltages that are within the following limits.
V
s
u
p
-to-COM..................................... 50 VDC,
Meas
u
rement Category I
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 9478 to signals or
u
se for
meas
u
rements within Meas
u
rement Categories II, III,
or IV.
1
The maxim
u
m voltage that can be applied or o
u
tp
u
t between V
s
u
p
and COM witho
u
t
creating a safety hazard.
