National Instruments NI USB-9201 User manual

USER GUIDE AND SPECIFICATIONS
NI USB-9201/9221
8-Channel, 12-Bit Analog Input Devices
This user guide describes how to use the National Instruments
NI USB-9201/9221 devices and lists the specifications. In this user guide,
the NI USB-9201/9221 with screw terminal and NI USB-9201/9221 with
D-SUB are referred to inclusively as the NI USB-9201/9221.
Introduction
The NI USB-9210/9221 data acquisition device provides a USB interface
for eight channels of 12-bit analog inputs with integrated signal
conditioning. The NI USB-9201/9211 consists of two components: an
NI 9201/9221 module and an NI USB-9162 carrier, as shown in Figure 1.
Figure 1. NI USB-9201/9221 Components
NI 9201/9221
NI USB-9162
NI USB-9201/9221
Hi-SPeed USB Carrier
NI USB-9162
Hi-Speed USB Carrier
NI USB-9162

NI USB-9201/9221 User Guide and Specifications 2 ni.com
Dimensions
Figures 2 and 3 show the NI USB-9201/9221 device dimensions.
Figure 2. NI USB-9201/9221 (Screw Terminal) Devices in Millimeters (Inches)
Figure 3. NI USB-9201/9221 (D-SUB) Devices in Millimeters (Inches)
Hi-Speed USB Carrier
NI USB-9162
140.23 mm
(5.521 in.)
137.82 mm
(5.426 in.)
120.68 mm
(4.751 in.)
118.26 mm
(4.656 in.)
88.12 mm
(3.469 in.)
25.34 mm
(0.998 in.)
Hi-Speed USB Carrier
NI USB-9162
125.76 mm
(4.951 in.)
123.38 mm
(4.857 in.)
120.68 mm
(4.751 in.)
118.26 mm
(4.656 in.)
88.12 mm
(3.469 in.)
25.34 mm
(0.998 in.)

©National Instruments Corporation 3 NI USB-9201/9221 User Guide and Specifications
Safety Guidelines
Operate the NI USB-9201/9221 only as described in these operating
instructions.
Caution Although the NI 9201/9221 might have more stringent certification standards
than the NI USB-9201/9221, when used with the NI USB-9162 carrier, the combined
system might be limited. Refer to the Specifications section for more information.
Hot Surface This icon denotes that the component may be hot. Touching this component
may result in bodily injury.
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 and the area is known
to be nonhazardous.
Caution The NI USB-9201/9221 is not certified for use in hazardous locations.
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages to the NI USB-9201/9221 with the
screw terminal only. Do not connect hazardous voltages to the
NI USB-9201/9221 with D-SUB.
If hazardous voltages are connected to the module, take the following
precautions. A hazardous voltage is a voltage >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
Caution When module terminals are live with hazardous voltages, make sure that the
terminals are not accessible by using the high voltage screw terminal backshell. Refer to
the Assembling the High Voltage Screw Terminal Backshell section for more information.

NI USB-9201/9221 User Guide and Specifications 4 ni.com
Related Documentation
Each application software package and driver includes information about
writing applications for taking measurements and controlling measurement
devices. The following references to documents assume you have
NI-DAQmx 8.7 or later, and where applicable, version 7.1 or later of the
NI application software.
NI-DAQmx for Windows
The DAQ Getting Started Guide describes how to install your NI-DAQmx
for Windows software, your NI-DAQmx-supported DAQ device, and how
to confirm that your device is operating properly. Select Start»All
Programs»National Instruments»NI-DAQ»DAQ Getting Started
Guide.
The NI-DAQ Readme lists which devices are supported by this version
of NI-DAQmx. Select Start»All Programs»National Instruments»
NI-DAQ»NI-DAQ Readme.
The NI-DAQmx Help contains general information about measurement
concepts, key NI-DAQmx concepts, and common applications that are
applicable to all programming environments. Select Start»All
Programs»National Instruments»NI-DAQ»NI-DAQmx Help.
LabVIEW
If you are a new user, use the Getting Started with LabVIEW manual
to familiarize yourself with the LabVIEW graphical programming
environment and the basic LabVIEW features you use to build data
acquisition and instrument control applications. Open the Getting Started
with LabVIEW manual by selecting Start»All Programs»National
Instruments»LabVIEW»LabVIEW Manuals or by navigating to the
labview\manuals directory and opening LV_Getting_Started.pdf.
Use the LabVIEW Help, available by selecting Help»Search the
LabVIEW Help in LabVIEW, to access information about LabVIEW
programming concepts, step-by-step instructions for using LabVIEW, and
reference information about LabVIEW VIs, functions, palettes, menus, and
tools. Refer to the following locations on the Contents tab of the LabVIEW
Help for information about NI-DAQmx:
•Getting Started»Getting Started with DAQ—Includes overview
information and a tutorial to learn how to take an NI-DAQmx
measurement in LabVIEW using the DAQ Assistant.
•VI and Function Reference»Measurement I/O VIs and
Functions—Describes the LabVIEW NI-DAQmx VIs and properties.

©National Instruments Corporation 5 NI USB-9201/9221 User Guide and Specifications
•Taking Measurements—Contains the conceptual and how-to
information you need to acquire and analyze measurement data in
LabVIEW, including common measurements, measurement
fundamentals, NI-DAQmx key concepts, and device considerations.
LabWindows/CVI
The Data Acquisition book of the LabWindows/CVI Help contains
measurement concepts for NI-DAQmx. This book also contains Taking an
NI-DAQmx Measurement in LabWindows/CVI, which includes
step-by-step instructions about creating a measurement task using the DAQ
Assistant. In LabWindows™/CVI™, select Help»Contents, then select
Using LabWindows/CVI»Data Acquisition.
The NI-DAQmx Library book of the LabWindows/CVI Help contains API
overviews and function reference for NI-DAQmx. Select Library
Reference»NI-DAQmx Library in the LabWindows/CVI Help.
Measurement Studio
If you program your NI-DAQmx-supported device in Measurement Studio
using Visual C++, Visual C#, or Visual Basic .NET, you can interactively
create channels and tasks by launching the DAQ Assistant from MAX or
from within Visual Studio .NET. You can generate the configuration code
based on your task or channel in Measurement Studio. Refer to the DAQ
Assistant Help for additional information about generating code. You also
can create channels and tasks, and write your own applications in your
ADE using the NI-DAQmx API.
For help with NI-DAQmx methods and properties, refer to the NI-DAQmx
.NET Class Library or the NI-DAQmx Visual C++ Class Library included
in the NI Measurement Studio Help. For general help with programming in
Measurement Studio, refer to the NI Measurement Studio Help, which is
fully integrated with the Microsoft Visual Studio .NET help. To view
this help file in Visual Studio. NET, select Measurement Studio»
NI Measurement Studio Help.
To create an application in Visual C++, Visual C#, or Visual Basic .NET,
follow these general steps:
1. In Visual Studio .NET, select File»New»Project to launch the New
Project dialog box.
2. Find the Measurement Studio folder for the language you want to
create a program in.
3. Choose a project type. You add DAQ tasks as a part of this step.

NI USB-9201/9221 User Guide and Specifications 6 ni.com
ANSI C without NI Application Software
The NI-DAQmx Help contains API overviews and general information
about measurement concepts. Select Start»All Programs»National
Instruments»NI-DAQ»NI-DAQmx Help.
The NI-DAQmx C Reference Help describes the NI-DAQmx Library
functions, which you can use with National Instruments data acquisition
devices to develop instrumentation, acquisition, and control applications.
Select Start»All Programs»National Instruments»NI-DAQ»
NI-DAQmx C Reference Help.
.NET Languages without NI Application Software
With the Microsoft .NET Framework version 1.1 or later, you can use
NI-DAQmx to create applications using Visual C# and Visual Basic
.NET without Measurement Studio. You need Microsoft Visual Studio
.NET 2003 or Microsoft Visual Studio 2005 for the API documentation to
be installed.
The installed documentation contains the NI-DAQmx API overview,
measurement tasks and concepts, and function reference. This help is fully
integrated into the Visual Studio .NET documentation. To view the
NI-DAQmx .NET documentation, go to Start»Programs»National
Instruments»NI-DAQ»NI-DAQmx .NET Reference Help. Expand
NI Measurement Studio Help»NI Measurement Studio .NET Class
Library»Reference to view the function reference. Expand
NI Measurement Studio Help»NI Measurement Studio .NET Class
Library»Using the Measurement Studio .NET Class Libraries to view
conceptual topics for using NI-DAQmx with Visual C# and Visual
Basic .NET.
To get to the same help topics from within Visual Studio, go to
Help»Contents. Select Measurement Studio from the Filtered By
drop-down list and follow the previous instructions.
Device Documentation and Specifications
NI-DAQmx includes the Device Document Browser, which contains
online documentation for supported DAQ, SCXI, and switch devices, such
as help files describing device pinouts, features, and operation, and PDF
files of the printed device documents. You can find, view, and/or print the
documents for each device using the Device Document Browser at any
time by inserting the CD. After installing the Device Document Browser,
device documents are accessible from Start»All Programs»National
Instruments»NI-DAQ»Browse Device Documentation.
Note You can also download these documents at ni.com/manuals.

©National Instruments Corporation 7 NI USB-9201/9221 User Guide and Specifications
Training Courses
If you need more help getting started developing an application with NI
products, NI offers training courses. To enroll in a course or obtain a
detailed course outline, refer to ni.com/training.
Technical Support on the Web
For additional support, refer to ni.com/support or zone.ni.com.
Installing the Software
Software support for the NI USB-9201/9221 for Windows Vista/XP/2000
is provided by NI-DAQmx. The DAQ Getting Started Guide, which you
can download at ni.com/manuals, offers NI-DAQmx users step-by-step
instructions for installing software and hardware, configuring channels and
tasks, and getting started developing an application.
Installing Other Software
If you are using other software, refer to the installation instructions that
accompany your software.
Example Programs
The NI-DAQmx CD contains example programs that you can use to get
started programming with the NI USB-9201/9221. Refer to the NI-DAQmx
for USB Devices Getting Started Guide that shipped with your device, and
is also accessible from Start»All Programs»National Instruments»
NI-DAQ,for more information.
Installing the NI USB-9201/9221 Device
Before installing the device, you must install the software you plan to use
with the device. Refer to the Installing the Software section of this guide
and the documentation included with the software for more information.
Installing the NI 9201/9221 in the NI USB-9162 Carrier
The NI 9201/9221 module and the NI USB-9162 carrier are packaged
separately. Refer to Figure 2, while completing the following assembly
steps:
1. Make sure that no signals are connected to the NI 9201/9221 module
and that the USB cable is not connected to the device.
2. Remove the protective cover from the 15-pin D-SUB connector.

NI USB-9201/9221 User Guide and Specifications 8 ni.com
3. Align the I/O module with the carrier, as shown in Figure 4.
Figure 4. Module Installation
4. Squeeze the latches and insert the NI 9201/9221 module into the
NI USB-9162 carrier.
5. Press firmly on the connector side of the NI 9201/9221 module until
the latches lock the module into place, as shown in Figure 5.
Figure 5. Locking Module into Place
1 High Voltage Screw Terminal Backshell
1

©National Instruments Corporation 9 NI USB-9201/9221 User Guide and Specifications
Mounting the NI USB-9201/9221 to a Panel
Threaded inserts are located in the NI USB-9201/9221 for mounting it to a
panel. Refer to Figure 6 for dimensions.
Figure 6. Module Dimensions in Millimeters (Inches)
Connecting the NI USB-9201/9221 to a Computer
Plug one end of the USB cable into the NI USB-9201/9221 and the other
end into an available USB port on the computer. Refer to the NI-DAQmx
for USB Devices Getting Started Guide that shipped with your device, and
is also accessible from Start»All Programs»National Instruments»
NI-DAQ,for more information.
LED Indicator
The NI USB-9201/9221 device has a green LED next to the USB
connector. The LED indicator indicates device status, as listed in Table 1.
When the device is connected to a USB port, the LED blinks steadily to
indicate that the device is initialized and is receiving power from the
connection.
If the LED is not blinking, it may mean that the device is not initialized or
the computer is in standby mode. In order for the device to be recognized,
the device must be connected to a computer that has NI-DAQmx installed
on it. If your device is not blinking, make sure your computer has the latest
version of NI-DAQmx installed on it, and the computer is not in standby
mode.
72.2 mm
(2.84 in.)
85.7 mm
(3.37 in.)
76.1 mm
(3.00 in.)
Threaded Insert
M3 x 0.5
8.5 mm (0.34 in.) Max Depth

NI USB-9201/9221 User Guide and Specifications 10 ni.com
Wiring the NI USB-9201/9221 Device
The NI USB-9201/9221 provides connections for eight analog input
channels.
Caution A high voltage screw terminal backshell must be installed when using hazardous
voltages (>42.4 Vpk, 60 VDC).
Note Table 2 illustrates the accessories available from ni.com for use with the
NI USB-9201/9221.
Table 1. LED State/Device Status
LED State Device Status
Not lit Device not connected or in suspend.
On, not blinking Device connected, but no module installed.
Single-blink Operating normally.
Double-blink Connected to USB Full-Speed port. Device
performance might be affected. Refer to the
Specifications section for more information.
Quadruple-blink Device error. Refer to ni.com/support.
Table 2. Accessories
Device Accessory Accessory Description
USB-9201/9221 with Screw Terminal NI 9932 10-terminal, detachable, high
voltage, screw terminal backshell1
USB-9201/9221 with 25-pin D-SUB NI 9934 25-pin D-SUB connector
1 For more information about installing the backshell, refer to the Assembling the High Voltage Screw Terminal Backshell
section.

©National Instruments Corporation 11 NI USB-9201/9221 User Guide and Specifications
Each channel has a terminal or pin, AI, to which you can connect a voltage
signal. The NI USB-9201/9221 also has a common terminal or pin, COM,
that is internally connected to the isolated ground reference of the module.
Refer to Table 3 for the terminal assignments of the NI USB-9201/9221
with screw terminal. Refer to Figure 7 for the pin assignments of the
NI USB-9201/9221 with D-SUB.
Table 3. Terminal Assignments
Module Terminal Signal
0AI 0
1AI 1
2AI 2
3AI 3
4AI 4
5AI 5
6AI 6
7AI 7
8No connection
9Common (COM)
0
1
2
3
4
5
6
7
8
9

NI USB-9201/9221 User Guide and Specifications 12 ni.com
Figure 7. Pin Assignments
Connecting Single-Ended Voltage Signals to the NI USB-9201/9221
You can connect single-ended voltage signals to the NI USB-9201/9221.
Connect the positive lead of the voltage signal to AI. Connect the ground
signal to COM.
Figure 8. Connecting a Single-Ended Voltage Signal to the NI USB-9201/9221
Refer to your software documentation, accessible from Start»
All Programs»National Instruments»NI-DAQ, for information about
different methods of reading NI USB-9201/9221 data.
COM
NC
COM
COM
NC
COM
COM
NC
COM
COM
NC
COM
COM
AI0
NC
AI1
AI2
NC
AI3
AI4
NC
AI5
AI6
NC
AI7
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
COM
AI
Voltage
Source USB-9201/9221
+
–

©National Instruments Corporation 13 NI USB-9201/9221 User Guide and Specifications
Assembling the High Voltage Screw Terminal Backshell
The NI 9932 high voltage screw terminal backshell must be installed when
using hazardous voltages (>42.4 Vpk, 60 VDC). Refer to Figure 9 while
completing the following steps to assemble the backshell:
1. Connect the leads to the screw terminal and secure with the strain
relief.
2. Finish by snapping the backshell around the connector.
Figure 9. High Voltage Screw Terminal Backshell
Figure 10. Assembled High Voltage Screw Terminal Backshell
1 Strain Relief
1

NI USB-9201/9221 User Guide and Specifications 14 ni.com
NI USB-9201/9221 Circuitry
The NI USB-9201/9221 channels are isolated, and the device protects each
channel from overvoltages. The input signals are scanned, buffered,
conditioned, and then sampled by a single 12-bit ADC. For more
information about overvoltage protection, refer to the Specifications
section.
Figure 11. Input Circuitry for One Channel
Specifications
The following specifications are typical for the range 0 to 60 °C
unless otherwise noted. All voltages are relative to COM unless otherwise
noted.
Input Characteristics
Number of channels................................8
ADC resolution.......................................12 bits
Type of ADC ..........................................Successive approximation
register (SAR)
Sample rate (aggregate)1
NI USB-9201
Single channel ..........................800 kS/s max
Scanning ...................................500 kS/s
NI USB-9221...................................800 kS/s max
1 Full performance requires the use of a USB 2.0 Hi-Speed host controller and USB 2.0 hubs.
USB-9201/9221
Mux
COM
AI 7
AI 0
Isolated
ADC
Overvoltage
Protection
Buffer

©National Instruments Corporation 15 NI USB-9201/9221 User Guide and Specifications
Operating voltage ranges1
NI USB-9201 .................................. ±10 V (not software selectable)
NI USB-9221 .................................. ± 60 V (not software selectable)
Maximum voltage, (AI or COM to earth ground, verified by a dielectric
withstand test)
Screw terminal ................................ 250 Vrms, 5 seconds max
D-SUB ............................................ ±60 VDC
Isolation voltage (AI or COM to earth ground, verified by a dielectric
withstand test)
Screw terminal ................................ 2,300 Vrms, 5 seconds max
D-SUB ............................................ 1,000 Vrms, 5 seconds max
Overvoltage protection
(AI to COM)........................................... ±100 V
Accuracy2
1 Refer to the Safety section for details about safe operating voltages.
2 Excludes noise.
Error
Percent of
Reading
(Gain Error)
Percent of
Range
(Offset
Error)*
NI USB-9201
Calibrated typ (25 °C, ±5 °C) ±0.04% ± 0.07%
Calibrated max (0 to 60 °C) ±0.25% ± 0.25%
Uncalibrated typ (25 °C, ±5 °C) ±0.26% ± 0.46%
Uncalibrated max (0 to 60 °C) ±0.67% ±1.25%
NI USB-9221
Calibrated typ (25 °C, ±5 °C) ±0.04% ±0.07%
Calibrated max (0 to 60 °C) ±0.25% ±0.25%
Uncalibrated typ (25 °C, ±5 °C) ±0.26% ±0.43%
Uncalibrated max (0 to 60 °C) ±0.67% ±1.06%
* Range equals 10.53 V for the NI USB-9201, 62.50 V for the NI USB-9221.

NI USB-9201/9221 User Guide and Specifications 16 ni.com
Stability
Offset drift
NI USB-9201............................±100 μV/°C
NI USB-9221............................±580 μV/°C
Gain drift .........................................±34 ppm/°C
Input bandwidth (–3 dB)
NI USB-9201...................................690 kHz min
NI USB-9221...................................950 kHz min
Input impedance
Resistance ........................................1 MΩ
Capacitance......................................5 pF
Input noise (code-centered)
RMS.................................................0.7 LSBrms
Peak-to-peak ....................................5 LSB
No missing codes....................................12 bits
DNL ........................................................–0.9 to 1.5 LSB
INL..........................................................±1.5 LSB
Crosstalk .................................................–75 dB, 10 kHz
Settling time (to 1 LSB)
NI USB-9201...................................2 μs
NI USB-9221...................................1.25 μs
Power Requirements
Power consumption from USB...............500 mA, max
Suspend mode..................................2.5 mA, max
Bus Interface
USB specification ...................................USB 2.0 Hi-Speed

©National Instruments Corporation 17 NI USB-9201/9221 User Guide and Specifications
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Dimensions
With screw terminal........................ 14.0 cm ×8.8 cm ×2.5 cm
(5.52 in. ×3.47 in. ×1.00 in.)
With 25-pin D-SUB ........................ 12.6 cm ×8.8 cm ×2.5 cm
(4.95 in. ×3.47 in. ×1.00 in.)
Screw-terminal wiring............................ 12 to 24 AWG copper conductor
wire with 10 mm (0.39 in.) of
insulation stripped from the end
Torque for screw terminals .................... 0.5–0.6 N · m (4.4–5.3 lb · in.)
Weight
With screw terminal........................ Approx. 250 g (8.8 oz)
With D-SUB ................................... Approx. 245 g (8.6 oz)
Safety
If you need to clean the module, wipe it with a dry towel.
Safety Voltages
Maximum Voltage
Connect only voltages that are within these limits.
AI to COM ............................................. ±60 VDC
Isolation Voltages for NI USB-9201/9221 with Screw Terminal
Channel-to-channel isolation ................. None
Channel-to-earth ground isolation
Continuous ...................................... 250 Vrms, Measurement
Category II
Withstand ........................................ 2,300 Vrms, verified by a 5 second
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). Do not use
this module with Measurement Category III or IV voltages

NI USB-9201/9221 User Guide and Specifications 18 ni.com
Isolation Voltages for NI USB-9201/9221 with D-SUB
Channel-to-channel.................................None
Channel-to-earth ground
Continuous.......................................60 VDC, Measurement
Category I
Withstand.........................................1,000 Vrms, verified by a 5 second
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. Do not
use this module with Measurement Category II, III, or IV voltages.
Safety Standards
This product is designed to meet 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 visit
ni.com/certification, search by model number or product line, and click the
appropriate link in the Certification column.
Hazardous Locations
The NI USB-9201/9221 is not certified for use in hazardous locations.
Environmental
The NI USB-9201/9221 is intended for indoor use only.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2) ...........0 to 60 °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 Corporation 19 NI USB-9201/9221 User Guide and Specifications
Storage humidity
(IEC 60068-2-56)................................... 5 to 95% RH, noncondensing
Maximum altitude .................................. 2,000 m
Pollution Degree (IEC 60664) ............... 2
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement, control,
and laboratory use:
• EN 61326 EMC requirements; Minimum Immunity
• EN 55011 Emissions; Group 1, Class A
• CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device with double-shielded cables.
CE Compliance
This product meets the essential requirements of applicable European
Directives, as amended for CE marking, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Note Refer to the Declaration of Conformity (DoC) for this product for any additional
regulatory compliance information. To obtain 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 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
not only to the environment but also 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 USB-9201/9221 User Guide and Specifications 20 ni.com
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their 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.htm.
Calibration
You can obtain the calibration certificate for the NI USB-9201/9221 at
ni.com/calibration.
Calibration interval ................................1 year
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