National Instruments NI 9375 Getting Started Manual

GETTING STARTED GUIDE

NI 9375

16 DI/16 DO, 30 VDC, 7 μs Sinking DI, 500 μs
Sourcing DO

This document explains how to connect to the NI 9375. In this
document, the NI 9375 with spring terminal and the NI 9375 with
DSUB are referred to inclusively as the NI 9375.

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 9375. 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.

Caution Electrostatic Discharge (ESD) can damage

the NI 9375 with spring terminal. To prevent damage,
use industry-standard ESD prevention measures during
installation, maintenance, and operation.

Safety Guidelines

Operate the NI 9375 only as described in this document.

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Caution Do not operate the NI 9375 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
way. If the product is damaged, return it to NI for
repair.

Safety Voltages

Connect only voltages that are within the following limits:

NI 9375 with Spring Terminal Isolation Voltages

Channel-to-channel None

Channel-to-earth ground

Continuous 250 Vrms,

Measurement Category II

Withstand up to
4,000 m

3,000 Vrms, 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

NI 9375 Getting Started Guide | © National Instruments | 3

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 9375 with spring

terminal to signals or use for measurements within
Measurement Categories III or IV.

NI 9375 with DSUB Isolation Voltages

Channel-to-COM or
Vsup-to-COM

30 VDC maximum

Isolation

DI bank-to-DO bank 60 VDC maximum

Channel-to-Channel No isolation between channels

Channel-to-earth ground

Continuous 60 VDC,

Measurement Category I

Withstand up to
2,000 m

1,000 Vrms, verified by a 5 s
dielectric withstand test

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

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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 9375 with DSUB 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.

Safety Guidelines for Hazardous Locations

The NI 9375 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 9375 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.

NI 9375 Getting Started Guide | © National Instruments | 5

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.

Caution For Division 2 and Zone 2 applications,

install a protection device between any two terminals.
The device must prevent the Vsup-to-COM voltage
from exceeding 42 V if there is a transient overvoltage
condition.

Special Conditions for Hazardous Locations Use in
Europe and Internationally

The NI 9375 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 07 ATEX 0626664X and is IECEx UL 14.0089X

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