National Instruments NI 9212, Руководство пользователя

Страница: 6 / 16

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.
Caution
Do not connect the NI 9212 and TB-9212 with screw terminal to
signals or use for measurements within Measurement Categories III or IV.
NI 9212 and TB-9212 with Mini TC Isolation Voltages
Connect only voltages that are within the following limits:
Channel-to-channel isolation, Up to 5,000 m altitude
Continuous
60 VDC, Measurement Category I
Withstand 1,000 Vrms
Channel-to-earth ground isolation, Up to 5,000 m altitude
Continuous
60 VDC, Measurement Category I
Withstand 1,000 Vrms
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.
Caution
If using in Division 2 or Zone 2 hazardous locations
applications, do not connect the NI 9212 and TB-9212 with mini TC to
signals or use for measurements within Measurement Categories II, III, or
IV.
Note
Measurement Categories CAT I and CAT O are equivalent. These test
and measurement circuits are not intended for direct connection to the
ni.com
6
NI-9212