safety protection built into the device if the device is damaged in any way. If the
device is damaged, contact National Instruments for repair.
Caution
Do not substitute parts or modify the device except as described in this
user guide. Use the device only with the accessories specified in the installation
instructions.
Caution
Do not operate the device in an explosive atmosphere or where there may
be flammable gases or fumes. If you must operate the device in such an
environment, it must be in a suitably rated enclosure.
If you need to clean the device, use a dry cloth. Make sure that the device is completely dry
and free from contaminants before returning it to service.
Operate the device only at or below Pollution Degree 2. Pollution is foreign matter in a solid,
liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following
is a description of pollution degrees:
•
Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The
pollution has no influence.
•
Pollution Degree 2 means that only nonconductive pollution occurs in most cases.
Occasionally, however, a temporary conductivity caused by condensation must be
expected.
•
Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive
pollution occurs that becomes conductive due to condensation.
You must insulate signal connections for the maximum voltage for which the device is rated.
Do not exceed the maximum ratings for the device. Do not install wiring while the device is
live with electrical signals.
Operate the device at or below the Measurement Category I
1
. Measurement circuits are
subjected to working voltages
2
and transient stresses (overvoltage) from the circuit to which
they are connected during measurement or test. Measurement categories establish standard
impulse withstand voltage levels that commonly occur in electrical distribution systems. The
following is a description of measurement categories:
•
Measurement Category I is for measurements performed on circuits not directly
connected to the electrical distribution system referred to as MAINS
3
voltage. This
category is for measurements of voltages from specially protected secondary circuits.
1
Measurement Category is defined in electrical safety standard IEC 61010-1. Measurement
Category is also referred to as Installation Category.
2
Working voltage is the highest rms value of an AC or DC voltage that can occur across any
particular insulation.
3
MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably
rated measuring circuits may be connected to the MAINS for measuring purposes.
2
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NI USB-TC01 User Guide
