terre ou à d'autres voies, sous peine d'endommager et de compromettre
l'isolation. Le produit peut tomber en panne et son isolation risque
d'être endommagée si les tensions transitoires dépassent la surtension
transitoire nominale. Une analyse des tensions de fonctionnement, des
impédances de boucle, des surtensions temporaires et des surtensions
transitoires dans le système doit être effectuée avant de procéder à des
mesures.
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.
Note
Measurement Categories CAT I and CAT O are equivalent. These test
and measurement circuits are for other circuits not intended for direct
connection to the MAINS building installations of Measurement Categories
CAT II, CAT III, or CAT IV.
The maximum voltage that can be applied or output between a channel and COM
without creating a safety hazard.
Safety Guidelines for Hazardous Locations
The NI-9477 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous
locations; Class I, Zone 2, AEx nA IIC T4 Gc and Ex nA IIC T4 Gc hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
NI-9477 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
Caution
Do not disconnect I/O-side wires or connectors unless power has
been switched off or the area is known to be nonhazardous.
© National Instruments
5
NI-9477 Getting Started