National Instruments NI USB-9421 ユーザーズマニュアル
© National Instruments Corporation
15
NI USB-9421 User Guide and Specifications
Bus Interface
USB specification .................................. USB 2.0 Hi-Speed
Physical Characteristics
Dimensions
With screw terminal........................ 14.0 cm
× 8.8 cm × 2.5 cm
(5.52 in.
× 3.47 in. × 1.00 in.)
With 25-pin D-SUB ........................ 12.6 cm
× 8.8 cm × 2.5 cm
(4.95 in.
× 3.47 in. × 1.00 in.)
Screw-terminal wiring............................ 12 to 24 AWG copper conductor
wire with 10 mm (0.39 in.) of
insulation stripped from the end
insulation stripped from the end
Torque for screw terminals .................... 0.5 – 0.6 N · m (4.4 – 5.3 lb · in.)
Weight
With screw terminal........................ Approx. 250 g (8.8 oz)
With D-SUB ................................... Approx. 245 g (8.6 oz)
Safety
If you need to clean the module, wipe it with a dry towel.
Safety Voltages
NI USB-9421 with Screw Terminal Safety Voltages
Connect only voltages that are within these limits.
Channel-to-COM ................................... 30 V max
Isolation
Channel-to-channel ......................... No isolation between channels
Channel-to-earth ground
Withstand................................. 2,300 V
rms
, verified by a 5 second
dielectric withstand test
Continuous............................... 250 V
rms
,
Measurement Category II
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).
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).