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© National Instruments Corporation 17 NI USB-9229/9239 User Guide and Specifications
Physical Characteristics
Screw-terminal wiring............................16 to 28 AWG copper conductor
wire with 7 mm (0.28 in.) of
insulation stripped from the end
Torque for screw terminals .................... 0.22 to 0.25 N · m
(1.95to 2.21lb· in.)
Ferrules...................................................0.25 mm
2
to 0.5 mm
2
Weight....................................................249 g (8.8 oz)
Safety
If you need to clean the module, wipe it with a dry towel.
Safety Voltages
Isolation
Channel-to-earth ground
Continuous...............................250 V
rms
,
Measurement Category II
Withstand.................................2300 V
rms
, verified by a 5 s
dielectric withstand test
Channel-to-channel
Continuous...............................250 V
rms
,
Measurement Category II
Withstand.................................1390 V
rms
, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on circuits
directly connected to the electrical distribution system. This category refers
to local-level electrical distribution, such as that provided by a standard
wall outlet, for example, 115 V for U.S. or 230 V for Europe. Do not
connect the NI USB-9229/9239 to signals or use for measurements within
Measurement Categories III or IV.
Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement, control,
and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1