National Instruments NI 9218 Manual de usuario
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GETTING STARTED GUIDE
NI 9218
2 AI, 51.2 kS/s/ch Simultaneous, Universal
Measurements
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This document explains how to connect to the NI 9218. In this
document, the NI 9218 with LEMO and the NI 9218 with DSUB
are referred to inclusively as the NI 9218.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9218. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
Safety Guidelines
Operate the NI 9218 only as described in this document.
Caution Do not operate the NI 9218 in a manner not
specified in this document. Product misuse can result in
a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
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way. If the product is damaged, return it to NI for
repair.
NI 9218 with LEMO Safety Voltages
Connect only voltages that are within the following limits:
Maximum voltage,
from any pin to any pin
on a single connector1
±30 V
Isolation
Channel-to-channel, channel-to-Vsup, channel-to-earth,
Vsup-to-earth (up to 5,000 m)2
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms, verified by a 5 s
dielectric withstand test
1The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to
+30 V.
2Must use crimp contact LEMO plug (784162-01) to maintain these ratings.
Ratings are invalidated if solder version is used.
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Caution Any excitation output voltage to earth ground
must remain below 60 VDC for each channel. To
determine excitation output voltage to earth ground for
a channel, add the maximum excitation voltage to the
maximum potential on pin 3. The maximum excitation
voltages are 2 V +3% and 3.3 V +3% for the bridge
excitations, 12 V +5% for the +12 V excitation, and
22 V for the IEPE excitation.
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 Do not connect the NI 9218 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
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intended for direct connection to the MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT IV.
NI 9218 with DSUB Safety Voltages
Connect only voltages that are within the following limits:
Maximum voltage,
from any pin to any pin
on a single connector3
±30 V
Isolation
Channel-to-channel, channel-to-Vsup inputs (up to 5,000 m)
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms, verified by a 5 s
dielectric withstand test
3The maximum voltage between pin 2 and pin 3 on a single connector is -20 V to
+30 V.
NI 9218 Getting Started Guide | © National Instruments | 5
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Channel-to-earth ground (up to 3,000 m)
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms, verified by a 5 s
dielectric withstand test
Channel-to-earth ground (up to 5,000 m)
Continuous 60 VDC, Measurement
Category I
Withstand 860 Vrms
Vsup inputs-to-earth ground (up to 5,000 m)
Continuous 60 VDC, Measurement
Category I
Withstand 1,000 Vrms, verified by a 5 s
dielectric withstand test
Caution Any excitation output voltage to earth ground
must remain below 60 VDC for each channel. To
determine excitation output voltage to earth ground for
a channel, add the maximum excitation voltage to the
maximum potential on pin 3. The maximum excitation
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voltages are 2 V +3% and 3.3 V +3% for the bridge
excitations, 12 V +5% for the +12 V excitation, and
22 V for the IEPE excitation.
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 Do not connect the NI 9218 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 MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT IV.
NI 9218 Getting Started Guide | © National Instruments | 7
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Safety Guidelines for Hazardous Locations
The NI 9218 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
and Ex nA IIC T4 hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9218 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.
Caution Do not remove modules unless power has
been switched off or the area is known to be
nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
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Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9218 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 12 ATEX 1202658X and is
IECEx UL 14.0089X certified. Each NI 9218 is marked II 3G
and is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9218
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
NI 9218 Getting Started Guide | © National Instruments | 9
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