National Instruments NI 9229E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9229E/9239E
4-Channel, ±60/±10 V, 24-Bit Simultaneous,
Channel-to-Channel Isolated Analog Input Modules

NI 9229E/9239E 2 ni.com
This document describes how to use the National
Instruments 9229E and National Instruments 9239E and includes
dimensions, terminal assignments, and specifications. In this
document, the NI 9229E and NI 9239E are referred to inclusively
as the NI 9229E/9239E. 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 9229E/9239E. The end-product supplier is
responsible for conformity to any and all compliance
requirements.
Caution The NI 9229E/9239E must be installed inside a
suitable enclosure prior to use. Hazardous voltages may be
present.

© National Instruments Corp. 3 NI 9229E/9239E
NI 9229E/9239E Dimensions
The following figure shows the dimensions of the NI 9229E/9239E.
Figure 1. NI 9229E/9239E Dimensions in Millimeters (Inches)
0.0 (0.00)
26.7 (1.05) 58.4 (2.30) 66.0 (2.60)
73.4 (2.89)
0.0 (0.00)

NI 9229E/9239E 4 ni.com
Connecting the NI 9229E/9239E
The NI 9229E/9239E provides connections for four
simultaneously sampled, isolated analog input channels.
Figure 2. NI 9229E/9239E Terminal Assignments
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
0
1
0
1
0
1
0
1

© National Instruments Corp. 5 NI 9229E/9239E
The NI 9229E/9239E has four 2-terminal detachable
screw-terminal connectors.
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9229E /9239E.
You can connect ground-referenced or floating signal sources to
the NI 9229E/9239E. Connect the positive signal of the signal
source to the AI+ terminal, and connect the negative signal of the
signal source to the AI– terminal. If you make a ground-referenced
connection between the signal source and the NI 9229E/9239E,
make sure the voltage on the AI+ and AI– connections are in the
channel-to-earth safety voltage range to ensure proper operation of
the NI 9229E/9239E. Refer to the Specifications section for more
information about operating voltages and overvoltage protection.
Refer to Figures 3 and 4 for illustrations of how to connect
grounded and floating signal sources to the NI 9229E/9239E.

NI 9229E/9239E 6 ni.com
Figure 3. Connecting a Grounded Signal Source to the NI 9229E/9239E
Figure 4. Connecting a Floating Signal Source to the NI 9229E/9239E
NI 9229E/9239E
Signal
Source
AI–
+
–
AI+
NI 9229E/9239E
Signal
Source
AI–
+
–
AI+

© National Instruments Corp. 7 NI 9229E/9239E
The NI 9229E/9239E analog input channels are floating with
respect to earth ground and each other. The incoming analog signal
on each channel is conditioned, buffered, and then sampled by a
24-bit Delta-Sigma ADC.
Each channel provides an independent signal path and ADC,
enabling you to sample all four channels simultaneously. Refer
to Figure 5 for an illustration of the circuitry for one channel.
Figure 5. Input Circuitry for One Channel of the NI 9229E/9239E
NI 9229E/9239E
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
Prefilter

NI 9229E/9239E 8 ni.com
Understanding NI 9229E/9239E Filtering
The NI 9229E/9239E uses a combination of analog and digital
filtering to provide an accurate representation of in-band signals
while rejecting out-of-band signals. The filters discriminate
between signals based on the frequency range, or bandwidth, of
the signal. The three important bandwidths to consider are the
passband, the stopband, and the alias-free bandwidth.
The NI 9229E/9239E represents signals within the passband, as
quantified primarily by passband flatness and phase nonlinearity.
All signals that appear in the alias-free bandwidth are either
unaliased signals or signals that have been filtered by at least
the amount of the stopband rejection.
Passband
The signals within the passband have frequency-dependent gain or
attenuation. The small amount of variation in gain with respect to
frequency is called the passband flatness. The digital filters of the
NI 9229E/9239E adjust the frequency range of the passband to
match the data rate. Therefore, the amount of gain or attenuation at
a given frequency depends on the data rate. Figure 6 shows typical
passband flatness for the NI 9229E/9239E.

© National Instruments Corp. 9 NI 9229E/9239E
Figure 6. Typical Passband Flatness for the NI 9229E/9239E
Frequency/Data Rate
0.50.4
0.025
0.000
–0.025
–0.050
0.30.20.10
Gain (dB)

NI 9229E/9239E 10 ni.com
Stopband
The filter significantly attenuates all signals above the stopband
frequency. The primary goal of the filter is to prevent aliasing.
Therefore, the stopband frequency scales precisely with the data
rate. The stopband rejection is the minimum amount of attenuation
applied by the filter to all signals with frequencies within the
stopband.
Alias-Free Bandwidth
Any signal that appears in the alias-free bandwidth of the
NI 9229E/9239E is not an aliased artifact of signals at a higher
frequency. The alias-free bandwidth is defined by the ability of the
filter to reject frequencies above the stopband frequency and equals
the data rate minus the stopband frequency.
Understanding NI 9229E/9239E Data Rates
The frequency of a master timebase ( fM) controls the data rate ( fs)
of the NI 9229E/9239E. The NI 9229E/9239E includes an internal
master timebase with a frequency of 12.8 MHz, but the module
also can accept an external master timebase or export its
own master timebase. To synchronize the data rate of an
NI 9229E/9239E with other modules that use master timebases

© National Instruments Corp. 11 NI 9229E/9239E
to control sampling, all of the modules must share a single master
timebase source. Refer to the software help for information about
configuring the master timebase source for the NI 9229E/9239E.
Visit ni.com/info and enter cseriesdoc for information about
C Series documentation.
The following equation provides the available data rates of the
NI 9229E/9239E:
fs=
where nis any integer from 1 to 31.
However, the data rate must remain within the appropriate data rate
range. Refer to the Specifications section for more information
about the data rate range. When using the internal master timebase
of 12.8 MHz, the result is data rates of 50 kS/s, 25 kS/s, 16.67 kS/s,
and so on down to 1.613 kS/s, depending on the value of n. When
using an external timebase with a frequency other than 12.8 MHz,
the NI 9229E/9239E has a different set of data rates.
fM256÷
n
---------------------

NI 9229E/9239E 12 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. 13 NI 9229E/9239E
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 the AI– signal on each channel unless otherwise noted.
The specifications are the same for the NI 9229E and the NI 9239E
unless otherwise noted.
Input Characteristics
Number of channels .......................... 4 analog input channels
ADC resolution................................. 24 bits
Type of ADC..................................... Delta-Sigma
(with analog prefiltering)
Sampling mode ................................. Simultaneous
Internal master timebase ( fM)
Frequency ................................... 12.8 MHz
Accuracy..................................... ±100 ppm max
Data rate range ( fs) using internal master timebase
Minimum.................................... 1.613 kS/s
Maximum ................................... 50 kS/s

NI 9229E/9239E 14 ni.com
Data rate range ( fs) using external master timebase
Minimum.................................... 390.625 S/s
Maximum ................................... 51.2 kS/s
Data rates1( fs) .................................. , n= 1, 2, …, 31
Input voltage ranges (AI+ to AI–)
Overvoltage protection ..................... ±100 V
Input coupling................................... DC
Input impedance (AI+ to AI–) .......... 1 MΩ
1 The data rate must remain within the appropriate data rate range. Refer to the
Understanding NI 9229E /9239E Data Rates section for more information.
Module Nominal (V) Typical (V) Minimum (V)
NI 9229E ±60 ±62.64 ±61.5
NI 9239E ±10 ±10.52 ±10.3
fM256÷
n
---------------------

© National Instruments Corp. 15 NI 9229E/9239E
Accuracy, NI 9229E
Measurement Conditions
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (–40 to 70 °C) ±0.13% ±0.05%
Calibrated typ (25 °C, ±5 °C) ±0.03% ±0.008%
Uncalibrated max (– 40 to 70 °C) ±1.2% ±0.55%
Uncalibrated typ (25 °C, ±5 °C) ±0.3% ±0.11%
*Range equals 62.64 V

NI 9229E/9239E 16 ni.com
Accuracy, NI 9239E
Input noise
NI 9229E .................................... 320 μVrms
NI 9239E .................................... 70 μVrms
Stability
Gain drift .................................... ±5 ppm/°C
Offset drift
NI 9229E.............................. ±150 μV/°C
NI 9239E.............................. ±26 μV/°C
Measurement Conditions
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (–40 to 70 °C) ±0.13% ±0.06%
Calibrated typ (25 °C, ±5 °C) ±0.03% ±0.008%
Uncalibrated max (– 40 to 70 °C) ±1.4% ±0.70%
Uncalibrated typ (25 °C, ±5 °C) ±0.3% ±0.11%
*Range equals 10.52 V

© National Instruments Corp. 17 NI 9229E/9239E
Post calibration gain match
(ch-to-ch, 20 kHz)............................. 0.22 dB max
Crosstalk (1 kHz).............................. –130 dB
Phase mismatch (ch-to-ch)
NI 9229E .................................... 0.045°/kHz max
NI 9239E .................................... 0.075°/kHz max
Phase mismatch (module-to-module, max)
NI 9229E .................................... 0.045°/kHz + 360°· fin /fM
NI 9239E .................................... 0.075°/kHz + 360°· fin /fM
Phase nonlinearity ( fs = 50 kS/s) ...... 0.11° max
Input delay
NI 9229E .................................... 38.4/fs+ 2.6 μs
NI 9239E .................................... 38.4/fs+ 3 μs
Passband
Frequency ................................... 0.453 · fs
Flatness ( fs = 50 kS/s) ................ ±100 mdB max
Stopband
Frequency ................................... 0.547 · fs
Rejection..................................... 100 dB

NI 9229E/9239E 18 ni.com
Alias-free bandwidth ........................ 0.453 · fs
–3 dB prefilter bandwidth
(fs = 50 kS/s) ..................................... 24.56 kHz
CMRR ( fin = 60 Hz)
NI 9229E .................................... 116 dB
NI 9239E .................................... 126 dB
SFDR (1 kHz, –60 dBFS)................. 128 dBFS
Total Harmonic Distortion (THD)
1 kHz, –1 dBFS .......................... –99 dB
1 kHz, –20 dBFS ........................ –105 dB
MTBF ............................................... 662,484 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.

© National Instruments Corp. 19 NI 9229E/9239E
Power Requirements
Power consumption from chassis
Active mode ............................... 740 mW max
Sleep mode ................................. 25 μW max
Thermal dissipation (at 70 °C)
Active mode ............................... 760 mW max
Sleep mode ................................. 16 mW max
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.
Screw-terminal wiring ...................... 16 to 28 AWG copper
conductor wire with 7 mm
(0.28 in.) of insulation
stripped from the end

NI 9229E/9239E 20 ni.com
Torque for screw terminals ............... 0.22 to 0.25 N · m
(1.95to2.21lb·in.)
Ferrules ............................................. 0.25 mm2to 0.5 mm2
Weight............................................... 50 g (1.8 oz)
Safety
Isolation Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Continuous ................................. 250 Vrms,
Measurement Category II,
(Basic insulation)
Withstand.................................... 1,390 Vrms, verified by a 5 s
dielectric withstand test
Channel-to-earth ground
Continuous ................................. 250 Vrms,
Measurement Category II,
(Double insulation)
Withstand.................................... 2,300 Vrms, verified by a 5 s
dielectric withstand test