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.
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages only to the NI-9472 with screw terminal and the
NI-9472 with spring terminal. Do not connect hazardous voltages to the NI-9472 with
DSUB.
Caution
Ensure that hazardous voltage wiring is performed only by
qualified personnel adhering to local electrical standards.
Caution
Do not mix hazardous voltage circuits and human-accessible
circuits on the same module.
Caution
Ensure that devices and circuits connected to the module are
properly insulated from human contact.
Caution
When module terminals are hazardous voltage LIVE (>42.4 V
pk
/
60 V DC), you must ensure that devices and circuits connected to the
module are properly insulated from human contact. You must use the NI
ni.com
6
NI-9472 Getting Started
