National Instruments NI 9208E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9208E
16-Channel, ±20 mA, 24-Bit Analog Input Module

NI 9208E Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9208E
and includes dimensions, pin assignments, and specifications for the
NI 9208E. Visit ni.com/info and enter rdsoftwareversion to
determine which software you need for the modules you are using.
For information about installing, configuring, and programming the
system, refer to the system documentation. Visit ni.com/info and
enter cseriesdoc for information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9208E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9208E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.

© National Instruments Corp. 3 NI 9208E Operating Instructions and Specifications
NI 9208E Dimensions
The following figure shows the dimensions of the NI 9208E.
Figure 1. NI 9208E Dimensions in Millimeters (Inches)
73.4 (2.89)
0.0 (0.00)
26.7 (1.05)
58.4 (2.30)
66.0 (2.60)
0.0 (0.00)

NI 9208E Operating Instructions and Specifications 4 ni.com
Connecting the NI 9208E
The NI 9208E has a 37-pin DSUB connector that provides
connections for 16 analog input channels.
Figure 2. NI 9208E Pin Assignments
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
COM
COM
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
AI0
AI1
AI2
AI3
AI4
AI5
AI6
AI7
COM
COM
AI8
AI9
AI10
AI11
AI12
AI13
AI14
AI15
Vsup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

© National Instruments Corp. 5 NI 9208E Operating Instructions and Specifications
Each channel has an AI pin to which you can connect a current
signal. The NI 9208E also has 17 Vsup pins, one for connecting an
external power supply, and one for each channel. There are also
four common pins, COM, that are internally connected to the
isolated ground reference of the module.
The input signals are scanned, amplified, conditioned, and then
sampled by a single 24-bit ADC. The module provides overvoltage
protection for each channel. Only one channel can be in an
overvoltage condition at a time. Refer to the Specifications section
for information about overvoltage protection. Refer to Figure 3 for
an illustration of the input circuitry on the NI 9208E.

NI 9208E Operating Instructions and Specifications 6 ni.com
Figure 3. Input Circuitry on the NI 9208E
NI 9208E
RR
Amp Isolated
ADC
MUX
V
sup
V
sup
AI0
COM
COM
AI15

© National Instruments Corp. 7 NI 9208E Operating Instructions and Specifications
You can connect an external power supply to the NI 9208E. This
power supply provides the current for the devices you connect to
the module. Connect the positive lead of the power supply to a
Vsup pin and the negative lead of the power supply to COM. Install
a 2 A maximum, fast-acting fuse between the external power
supply and the Vsup pin. Refer to the Specifications section for
information about the Vsup pins.
Note The Vsup pins are internally connected to each
other. You can connect only one external voltage supply
to the device.
Caution Do not remove or insert modules if the external
power supply connected to the Vsup and COM pins is
powered on.

NI 9208E Operating Instructions and Specifications 8 ni.com
You can connect single-ended current signals to the NI 9208E,
including loop-powered and three-wire current transducers. To
connect a loop-powered transducer, connect the current signal to
the AI pin of the channel and the supply terminal to a Vsup pin. For
a three-wire transducer, also connect the common of the device to
COM. Refer to Figures 4 and 5 for illustrations of how to connect
loop-powered and three-wire current transducers to the NI 9208E.
Figure 4. Connecting a Loop-Powered Current Transducer to the NI 9208E
NI 9208E
+
–
COM
AI0
External
Power
Supply
Loop-Powered
Current
Transducer
Vsup
COM
Vsup
2 A
Max

© National Instruments Corp. 9 NI 9208E Operating Instructions and Specifications
Figure 5. Connecting a Three-Wire Current Transducer to the NI 9208E
NI 9208E
V
sup
COM
+
–
COM
V
sup
AI0
External
Power
Supply
Three-Wire
Current
Transducer
2 A
Max
OUT
+
–

NI 9208E Operating Instructions and Specifications 10 ni.com
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.

© National Instruments Corp. 11 NI 9208E Operating Instructions and Specifications
Specifications
The following specifications are typical for the range –40 to 85 °C
internal to any enclosures unless otherwise noted. All voltages are
relative to COM unless otherwise noted.
Input Characteristics
Number of channels.......................... 16 analog input channels
ADC resolution................................. 24 bits
Type of ADC..................................... Delta-Sigma
Sampling mode ................................. Scanned
Input range
Minimum.................................... ±21.5 mA
Typical ........................................ ±22 mA
Conversion time (per channel)
High-resolution mode................. 52 ms
High-speed mode........................ 2 ms
Overvoltage protection,
channel-to-COM ............................... ±30 V max on one channel at
a time

NI 9208E Operating Instructions and Specifications 12 ni.com
Vsup pins
Current........................................ 2 A max
Voltage........................................ 30 V max
Input impedance................................ 85 Ω
Accuracy
Input noise
High-resolution mode................. 50 nArms
High-speed mode........................ 200 nArms
Stability
Gain drift .................................... 20 ppm/°C
Offset drift .................................. 62 nA/°C
Measurement Conditions
Percent of Reading
(Gain Error)
Percent of Range*
(Offset Error)
Calibrated error, max
(–40 to 85 °C)
0.76% 0.04%
*Range equals 22 mA.

© National Instruments Corp. 13 NI 9208E Operating Instructions and Specifications
NMRR (High-resolution mode only)
50 Hz .......................................... 66 dB
60 Hz .......................................... 68 dB
MTBF ............................................... Contact NI for Bellcore
MTBF or MIL-HDBK-217F
specifications.
Power Requirements
Power consumption from chassis
Active mode ............................... 282 mW max
Sleep mode ................................. 25 μW max
Thermal dissipation (at 85 °C)
Active mode ............................... 1.29 W max
Sleep mode ................................. 0.72 W max

NI 9208E Operating Instructions and Specifications 14 ni.com
Physical Characteristics
Use a dry, low-velocity stream of air to clean the module. If
needed, use a soft-bristle brush for cleaning around components.
Note For two-dimensional drawings and
three-dimensional models of the C Series module and
connectors, visit ni.com/dimensions and search by
module number.
Weight............................................... 45 g (1.6 oz)
Safety
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM .............................. ±30 V
Isolation
Channel-to-channel .................... None
Channel-to-earth ground
Continuous ........................... 60 VDC,
Measurement Category I,
(Double insulation)

© National Instruments Corp. 15 NI 9208E Operating Instructions and Specifications
Withstand ............................. 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 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 9208E to signals or use
for measurements within Measurement Categories II,
III, or IV.
Safety Standards
This product meets the requirements of the following standards
of safety for electrical equipment for measurement, control,
and laboratory use when installed in a suitable enclosure:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1

NI 9208E Operating Instructions and Specifications 16 ni.com
Note For UL and other safety certifications, refer to the
product label or the Online Product Certification section.
Online Product Certification
Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain product
certifications and the DoC for this product, visit ni.com/
certification, search by module number or product line,
and click the appropriate link in the Certification column.
Environmental
National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2) ..... –40 to 85 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) ..... –40 to 85 °C
Operating humidity
(IEC 60068-2-56).............................. 10 to 90% RH,
noncondensing

© National Instruments Corp. 17 NI 9208E Operating Instructions and Specifications
Storage humidity
(IEC 60068-2-56).............................. 5 to 95% RH,
noncondensing
Maximum altitude............................. 2,000 m
Pollution Degree ............................... 2
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the NI and the
Environment Web page at ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.

NI 9208E Operating Instructions and Specifications 18 ni.com
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of the life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit ni.com/
environment/weee.
Calibration
You can obtain the calibration certificate and information about
calibration services for the NI 9208E at ni.com/calibration.
Calibration interval ........................... 2 years
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about China RoHS compliance, go to ni.com/
environment/rohs_china.)

© National Instruments Corp. 19 NI 9208E Operating Instructions and Specifications
Where to Go for Support
The National Instruments Web site is your complete resource for
technical support. At ni.com/support you have access to
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at ni.com/support
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
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