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OPERATING INSTRUCTIONS AND SPECIFICATIONS
ni.com/manuals
DeutschFrançais
NI 9227
4-Channel, 5 A
Channel-to-Channel Isolated Analog Input Module
, 24-Bit, Simultaneous,
rms
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This document describes how to use the National Instruments 9225
and includes specifications and pin assignments for the NI 9225.
Note The safety guidelines and specifications in this
document are specific to the NI 9225. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system.
Related Information
NI CompactDAQ &
NI CompactRIO Documentation
ni.com/info cseriesdoc
Software Support
ni.com/info softwareversion
2 | ni.com | NI 9227 Operating Instructions and Specifications
Chassis Compatibility
ni.com/info
Services
ni.com/services
compatibility
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Safety Guidelines
Operate the NI 9227 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.
Hazardous Voltage This icon denotes a warning
advising you to take precautions to avoid electrical
shock.
Caution Do not operate the NI 9242 in a manner not
specified in this manual. 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 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 V
NI 9227 Operating Instructions and Specifications | © National Instruments | 3
or 60 VDC to earth ground.
pk
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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.
4 | ni.com | NI 9227 Operating Instructions and Specifications
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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 9971
connector backshell kit to ensure that the terminals are
not accessible.
Figure 1 shows the NI 9971 connector backshell.
Figure 1. NI 9971 Connector Backshell
NI 9227 Operating Instructions and Specifications | © National Instruments | 5
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Connecting the NI 9227
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
0
1
0
1
0
1
0
1
The NI 9227 has four 2-terminal detachable screw-terminal
connectors that provide connections for four simultaneously
sampled, isolated analog input channels.
Figure 2. NI 9227 Terminal Assignments
6 | ni.com | NI 9227 Operating Instructions and Specifications
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You can connect ground-referenced or floating current sources to
the NI 9227. Connect the positive side of the current source to the
AI+ terminal, and connect the negative side of the current source
to the AI- terminal. If you make a ground-referenced connection
between the current source and the NI 9227, 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 9227. Refer to
the Specifications section for more information about operating
voltages.
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 9227.
NI 9227 Operating Instructions and Specifications | © National Instruments | 7
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Refer to Figures 3 and 4 for illustrations of how to connect
NI 9227
Current
Source
AI–
AI+
NI 9227
Current
Source
AI–
AI+
grounded and floating current sources to the NI 9227.
Figure 3. Connecting a Grounded Current Source to the NI 9227
Figure 4. Connecting a Floating Current Source to the NI 9227
8 | ni.com | NI 9227 Operating Instructions and Specifications
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The NI 9227 analog input channels are floating with respect to
NI 9227
AI+
AI–
ADC
Amplifier
Shunt
Resistor
Prefilter
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 of
the NI 9227.
Figure 5. Input Circuitry for One Channel of the NI 9227
NI 9227 Operating Instructions and Specifications | © National Instruments | 9
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Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments
recommends that you either use ferrules to terminate wires to the
detachable screw-terminal connector or use the NI 9971 backshell
kit to protect the connections. Refer to Figure 6 for an illustration
of using ferrules. Refer to Figure 1 for an illustration of the
NI 9971 connector backshell.
Figure 6. 2-Terminal Detachable Screw-Terminal Connector with Ferrule
10 | ni.com | NI 9227 Operating Instructions and Specifications
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Understanding NI 9227 Filtering
The NI 9227 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 9227 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 9227 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 7 shows typical
passband flatness for the NI 9227.
NI 9227 Operating Instructions and Specifications | © National Instruments | 11
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Figure 7. Typical Passband Flatness for the NI 9227
0.025
0.000
Gain (dB)
–0.025
–0.050
0.30.20.10
Frequency/Data Rate (Hz)
0.50.4
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.
12 | ni.com | NI 9227 Operating Instructions and Specifications
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Alias-Free Bandwidth
Any signal that appears in the alias-free bandwidth of the NI 9227
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 it is equal to the
data rate minus the stopband frequency.
Understanding NI 9227 Data Rates
The frequency of a master timebase (fM) controls the data rate (fs)
of the NI 9227. The NI 9227 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 9227 with other modules that use
master timebases 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 9227. Visit
information about C Series documentation.
NI 9227 Operating Instructions and Specifications | © National Instruments | 13
ni.com/info and enter cseriesdoc for
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The following equation provides the available data rates of the
fM256÷
n
---------------------
NI 9227:
f
=
s
where n is 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,
16.667 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 9227 has a different set of data rates.
Note The NI cRIO-9151 R Series Expansion chassis
does not support sharing timebases between modules.
14 | ni.com | NI 9227 Operating Instructions and Specifications
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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.
NI 9227 Operating Instructions and Specifications | © National Instruments | 15
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Specifications
The following specifications are typical for the range -40 to 70 °C
unless otherwise noted. All voltages are relative to the AI- signal
on each channel unless otherwise noted.
Caution The input terminals of this device are not
protected for electromagnetic interference. As a result,
this device may experience reduced measurement
accuracy or other temporary performance degradation
when connected cables are routed in an environment with
radiated or conducted radio frequency electromagnetic
interference. To limit radiated emissions and to ensure
that this device functions within specifications in its
operational electromagnetic environment, take
precautions when designing, selecting, and installing
measurement probes and cables.
16 | ni.com | NI 9227 Operating Instructions and Specifications
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Input Characteristics
Number of channels .......................... 4 analog input channels
ADC resolution................................. 24 bits
Type of ADC..................................... Delta-Sigma
Sampling mode .................................Simultaneous
Internal master timebase (f
)
M
Frequency ...................................12.8 MHz
Accuracy..................................... ±100 ppm max
Data rate range (f
) using internal master timebase
s
Minimum....................................1.613 kS/s
Maximum ................................... 50 kS/s
Data rate range (f
) using external master timebase
s
Minimum....................................390.625 S/s
Maximum ................................... 51.36 kS/s
NI 9227 Operating Instructions and Specifications | © National Instruments | 17
(with analog prefiltering)
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Data rates1 (fs)................................... , n = 1, 2, ..., 31
fM256÷
n
---------------------
2, 3
Safe operating input range
Overcurrent handling4....................... 10 A
............ 5 A
rms
for 1 s max
rms
with 19 s minimum
Instantaneous measuring range
cool down time at 5 A
5
rms
Minimum....................................14.051 A peak
Typical........................................ 14.977 A peak, at 23 ±5 °C
Typical scaling coefficient ................ 1.785397 μA/LSB
Input coupling...................................DC
1
The data rate must remain within the appropriate data rate range. Refer to the
Understanding NI 9227 Data Rates section for more information.
2
Refer to the Safety Guidelines section for more information about safe operating
voltages.
3
The maximum recommended continuous RMS current value applied simultaneously
on all 4 channels to keep the power dissipation inside the module within safe
operating limits.
4
Overcurrent conditions to keep the module operating within specified limits.
5
The maximum DC current that produces a non-saturated reading.
18 | ni.com | NI 9227 Operating Instructions and Specifications
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Input impedance (AI+ to AI-)........... 12 mΩ
Input noise (f
Accuracy at safe operating range of 5 A
Measurement Conditions
Calibrated max (-40 to 70 °C) ±0.37% ±0.18%
Calibrated typ (23 °C, ±5 °C) ±0.1% ±0.05%
Uncalibrated max (-40 to 70 °C) ±5.0% ±2.4%
Uncalibrated typ (23 °C, ±5 °C) ±2.5% ±1.0%
*
Range equals 7.07 A peak (5 A
= 50 kS/s)................... 400 μA
s
rms
Percent of
Reading
(Gain Error)
).
rms
rms
Percent of
Range
(Offset Error)
*
Accuracy at operating range of 10 A
Measurement Conditions
rms
Percent of
Reading
(Gain Error)
Percent of
Range
(Offset Error)
Calibrated max (-40 to 70 °C) ±0.38% ±0.19%
*
Range equals 7.07 A peak (5 A
NI 9227 Operating Instructions and Specifications | © National Instruments | 19
rms
).
*
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Stability
5
512
---------
Gain drift .................................... ±21 ppm/°C
Offset drift ..................................±51 μA/°C
Post calibration gain match
(channel-to-channel, fin = 20 kHz).... ±130 mdB max
Crosstalk
(fin = 1 kHz) ................................-90 dB
(f
= 50 Hz) ................................-115 dB
in
Phase match
Channel-to-channel, max ........... 0.1°/kHz
Module-to-module, max.............0.1°/kHz + 360° · f
Phase linearity (fs = 50 kS/s) ............. 0.1° max
in/fM
Input delay ........................................ 40 /f
+ 2.9 μs
s
Passband
Frequency ................................... 0.453 · f
s
Flatness (fs = 50 kS/s) ................. ±100 mdB max
20 | ni.com | NI 9227 Operating Instructions and Specifications
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Stopband
Frequency ................................... 0.547 · f
s
Rejection..................................... 100 dB
Alias-free bandwidth ........................0.453 · f
s
-3 dB bandwidth (fs = 50 kS/s).......... 24.609 kHz
CMRR (f
SFDR (f
= 50 Hz).......................... 150 dB
in
= 1 kHz, -60 dBFS).......... 110 dB
in
Total Harmonic Distortion (THD)
(f
= 1 kHz, -1 dBFS).......................-95 dB
in
MTBF ...............................................Contact NI for Bellcore
MTBF or MIL-HDBK-217F
specifications.
Power Requirements
Power consumption from chassis
Active mode ............................... 730 mW max
Sleep mode ................................. 50 μW max
NI 9227 Operating Instructions and Specifications | © National Instruments | 21
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Thermal dissipation (at 70 °C)
1
Active mode ............................... 1.23 W max
Sleep mode ................................. 500 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
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
Torque for screw terminals ............... 0.22 to 0.25 N · m
Ferrules ............................................. 0.25 mm
Weight...............................................145 g (5.1 oz)
1
Measured with 5 A
22 | ni.com | NI 9227 Operating Instructions and Specifications
on each channel.
rms
conductor wire with 7 mm
(0.28 in.) of insulation
stripped from the end
(1.95to2.21lb· in.)
2
to 0.5 mm
2
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Safety
Isolation Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Continuous .................................250 V
Measurement Category II
Withstand....................................1,390 V
dielectric withstand test
Channel-to-earth ground
Continuous .................................250 V
Measurement Category II
Withstand....................................2,300 V
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 to signals or use for
measurements within Measurement Categories III or IV.
NI 9227 Operating Instructions and Specifications | © National Instruments | 23
,
rms
, verified by a 5 s
rms
,
rms
, verified by a 5 s
rms
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Safety Standards
This product meets the requirements of the following standards
of safety for electrical equipment for measurement, control, and
laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or the Online Product Certification section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC
standards for electrical equipment for measurement, control,
and laboratory use:
• EN 61326-2-1 (IEC 61326-2-1): Class A emissions; Industrial
immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
24 | ni.com | NI 9227 Operating Instructions and Specifications
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Note For the standards applied to assess the EMC of this
product, refer to the Online Product Certification section.
Note For EMC compliance, operate this device with
shielded cables.
CE Compliance
This product meets the essential requirements of applicable
European Directives as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility
Directive (EMC)
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
and click the appropriate link in the Certification column.
NI 9227 Operating Instructions and Specifications | © National Instruments | 25
, search by module number or product line,
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Shock and Vibration
To meet these specifications, you must panel mount the system and
either affix ferrules to the ends of the terminal wires or use the
NI 9971 backshell kit to protect the connections.
Operating vibration
Random (IEC 60068-2-64)......... 5 g
, 10 to 500 Hz
rms
Sinusoidal (IEC 60068-2-6) ....... 5 g, 10 to 500 Hz
Operating shock (IEC 60068-2-27).... 30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
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 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) .....-40 to 85 °C
Ingress protection..............................IP 40
26 | ni.com | NI 9227 Operating Instructions and Specifications
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Operating humidity
(IEC 60068-2-56).............................. 10 to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56).............................. 5 to 95% RH,
noncondensing
Maximum altitude............................. 2,000 m
Pollution Degree ...............................2
Environmental Management
NI 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 Minimize
Our Environmental Impact 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 9227 Operating Instructions and Specifications | © National Instruments | 27
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Waste Electrical and Electronic Equipment (WEEE)
⬉ᄤֵᙃѻક∵ᶧࠊㅵ⧚ࡲ⊩ ˄Ё
RoHS
˅
Ёᅶ᠋
National Instruments
ヺড়Ё⬉ᄤֵᙃ
ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ
(RoHS)
DŽ݇Ѣ
National InstrumentsЁRoHS
ড়㾘ᗻֵᙃˈ䇋ⱏᔩ
ni.com/environment/rohs_china
DŽ
(For information
about China RoHS compliance, go to
ni.com/
environment/rohs_china
.)
EU Customers At the end of the product life cycle,
all products must be sent to a WEEE recycling center.
For more information about WEEE recycling centers,
National Instruments WEEE initiatives, and compliance
with WEEE Directive 2002/96/EC on Waste and
Electronic Equipment, visit
.
weee
ni.com/environment/
Calibration
You can obtain the calibration certificate and information about
calibration services for the NI 9227 at
Calibration interval ...........................1 year
28 | ni.com | NI 9227 Operating Instructions and Specifications
ni.com/calibration.
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Worldwide Support and Services
The National Instruments website is your complete resource for
technical support. At
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
Vis it
ni.com/services for NI Factory Installation Services,
repairs, extended warranty, and other services.
Vis it
ni.com/register to register your National Instruments
product. Product registration facilitates technical support and
ensures that you receive important information updates from NI.
A Declaration of Conformity (DoC) is our claim of compliance
with the Council of the European Communities using the
manufacturer’s declaration of conformity. This system affords the
user protection for electromagnetic compatibility (EMC) and
product safety. You can obtain the DoC for your product by visiting
ni.com/certification. If your product supports calibration,
you can obtain the calibration certificate for your product
at ni.com/calibration.
NI 9227 Operating Instructions and Specifications | © National Instruments | 29
ni.com/support you have access to
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National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world. For
telephone support in the United States, create your service request
at
ni.com/support or dial 1 866 ASK MYNI (275 6964). For
telephone support outside the United States, visit the Worldwide
Offices section of ni.com/niglobal to access the branch office
websites, which provide up-to-date contact information, support
phone numbers, email addresses, and current events.
30 | ni.com | NI 9227 Operating Instructions and Specifications
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Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of
their respective companies. For patents covering National Instruments products/technology, refer to the appropriate
location: Help»Patents in your software, the
ni.com/patents. You can find information about end-user license agreements (EULAs) and
Notice at
third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at
ni.com/legal/export-compliance for the National Instruments global trade compliance policy and
how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED
WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR
ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense
and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14,
DFAR 252.227-7014, and DFAR 252.227-7015.
© 2008–2014 National Instruments. All rights reserved.
patents.txt file on your media, or the National Inst ruments Patent
375101E-01 Jul14
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Artisan Technology Group is your source for quality
new and certied-used/pre-owned equipment
• FAST SHIPPING AND
DELIVERY
• TENS OF THOUSANDS OF
IN-STOCK ITEMS
• EQUIPMENT DEMOS
• HUNDREDS OF
MANUFACTURERS
SUPPORTED
• LEASING/MONTHLY
RENTALS
• ITAR CERTIFIED
SECURE ASSET SOLUTIONS
SERVICE CENTER REPAIRS
Experienced engineers and technicians on staff
at our full-service, in-house repair center
Instra
Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com
Contact us: (888) 88-SOURCE | sales@artisantg.com | www.artisantg.com
SM
REMOTE INSPECTION
View
WE BUY USED EQUIPMENT
Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins
www.artisantg.com/WeBuyEquipment
LOOKING FOR MORE INFORMATION?
Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical
specications, manuals, and documentation
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