GETTING STARTED GUIDE
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NI 9437
8-Channel, 250 V Sinking Digital Input Module
This document explains how to connect the National
Instruments 9437.
Before You Begin Complete the hardware and software
installation procedures in your chassis documentation.
Note The guidelines in this document are specific to the
NI 9437. 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 9437 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may
be hot. Touching this component may result in bodily
injury.
Caution Do not operate the NI 9437 in a manner not
specified in this manual. Product misuse can result in a
hazard. You can compromise the safety protection built
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into the product if the product is damaged in any way. If
the product is damaged, return it to National Instruments
for repair.
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk or 60 VDC to earth ground.
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 Make sure that devices and circuits connected
to the module are properly insulated from human contact.
NI 9437 Getting Started Guide | © National Instruments | 3
Caution When module terminals are hazardous voltage
LIVE (>42.4 V
/60 VDC), you must ensure that devices
pk
and circuits connected to the module are properly
insulated from human contact. You must use the NI 9932
connector backshell kit to ensure that the terminals are
not accessible.
Figure 1. NI 9932 Connector Backshell
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Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM, V
-to-COM ..... 300 VDC max
SUP
Isolation
Channel-to-channel .................... None
Channel-to-V
Channel-to-earth ground, V
......................... None
SUP
SUP
-to-earth ground,
COM-to-earth ground
Continuous ........................... 300 V
, Measurement
rms
Category II
Withstand ............................. 3,000 V, verified by a 5 s
dielectric withstand test
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 9437 to signals or use for
measurements within Measurement Categories III or IV.
NI 9437 Getting Started Guide | © National Instruments | 5
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