©
National Instruments Corporation
17
NI USB-9472 User Guide and Specifications
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-9472 with Screw Terminal
Channel-to-COM ................................... 30 V max
Isolation
Channel-to-channel ......................... No isolation between channels
Channel-to-earth ground
Withstand................................. 2,300 V
rms
, 5 seconds max
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).
NI USB-9472 with D-SUB
Channel-to-COM ................................... 30 V max
Isolation
Channel-to-channel ......................... No isolation between channels
Channel-to-earth ground
Withstand................................. 1,000 V
rms
, 5 seconds max
Continuous............................... 60 VDC,
Measurement Category I
Measurement Category I is for measurements performed on circuits not
directly connected to the electrical distribution system referred to as
MAINS
voltage. MAINS is a hazardous live electrical supply system that
powers equipment. This category is for measurements of voltages from
specially protected secondary circuits. Such voltage measurements include
signal levels, special equipment, limited-energy parts of equipment,
circuits powered by regulated low-voltage sources, and electronics.
