National Instruments NI 9223 Manual

CALIBRATION PROCEDURE
NI 9222/9223
This document contains the verification and adjustment procedures for the National
Instruments 9222 and National Instruments 9223. For more information on calibration, visit
ni.com/calibration. In this document, the NI 9222/9223 with screw terminal and
NI 9222/9223 with BNC are referred to inclusively as the NI 9222/9223.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 3
Initial Setup............................................................................................................................... 3
Verification ............................................................................................................................... 4
Accuracy Verification....................................................................................................... 4
Adjustment................................................................................................................................ 6
Accuracy Adjustment ....................................................................................................... 6
EEPROM Update ..................................................................................................................... 7
Reverification ........................................................................................................................... 7
Accuracy Under Calibration Conditions .................................................................................. 7
Worldwide Support and Services ............................................................................................. 8
Software
Calibrating the NI 9222/9223 with screw terminal requires the installation of NI-DAQmx 9.2 or
later on the calibration system. Calibrating the NI 9222/9223 with BNC requires the installation
of NI-DAQmx 9.9 or later. You can download NI-DAQmx from ni.com/downloads.
NI-DAQmx supports LabVIEW, LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET.
When you install NI-DAQmx, you only need to install support for the application software that
you intend to use.
ni.com/manuals
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2|ni.com |NI 9222/9223 Calibration Procedure
Documentation
Consult the following documents for information about the NI 9222/9223, NI-DAQmx, and
your application software. All documents are available on ni.com and help files install with the
software.
Test Equipment
Table 1 lists the equipment recommended for the performance verification and adjustment
procedures. If the recommended equipment is not available, select a substitute using the
requirements listed in Table 1.
NI cDAQ-9174/9178 USB Chassis Quick Start
NI-DAQmx installation and hardware setup
NI 9222/9223 Operating Instructions and Specifications
NI 9222/9223 specific information, specifications, and calibration interval
NI-DAQmx Readme
Operating system and application software support in NI-DAQmx
LabVIEW Help
LabVIEW programming concepts and reference information about NI-DAQmx
VIs and functions
NI-DAQmx C Reference Help
Reference information for NI-DAQmx C functions and NI-DAQmx C properties
NI-DAQmx .NET Help Support for Visual Studio
Reference information for NI-DAQmx .NET methods and NI-DAQmx .NET
properties, key concepts, and a C enum to .NET enum mapping table
Table 1. Recommended Equipment
Equipment Recommended Model Requirements
Calibrator Fluke 5700A Use a high-precision voltage source with an
accuracy ≤15 ppm and an output impedance
≤50 Ω.
Chassis NI cDAQ-9178 —

NI 9222/9223 Calibration Procedure |© National Instruments |3
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9222/9223
meets published specifications.
• Keep connections to the NI 9222/9223 as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
• For the NI 9222/9223 screw terminal, use shielded copper wire for all cable connections to
the device. Use twisted-pairs wire to eliminate noise and thermal offsets.
•Use50ΩBNC coaxial cable to connect signals to NI 9222/9223 with BNC.
• Verify that all connections to the NI 9222/9223 are secure.
• Maintain an ambient temperature of 23 ±5 °C. The NI 9222/9223 temperature will be
greater than the ambient temperature.
• Keep relative humidity below 80%.
• Allow a warm-up time of at least 10 minutes to ensure that the NI 9222/9223 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9222/9223.
1. Install NI-DAQmx.
2. Make sure the NI cDAQ-9178 power source is not connected.
3. Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the
NI cDAQ-9178 chassis empty.
4. Connect the NI cDAQ-9178 chassis to your host computer.
5. Connect the power source to the NI cDAQ-9178 chassis.
6. Launch Measurement & Automation Explorer (MAX).
7. Right-click the device name and select Self-Test to ensure that the module is working
properly.

4|ni.com |NI 9222/9223 Calibration Procedure
Verification
The following performance verification procedure describes the sequence of operation and test
points required to verify the NI 9222/9223 and assumes that adequate traceable uncertainties are
available for the calibration references.
Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9222/9223.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9222/9223 to the calibrator as shown in Figure 1.
Figure 1. NI 9222/9223 Terminal Assignments
Note If the calibrator outputs are truly floating, the negative output must be
connected to a quiet earth ground as well as AI- to give the entire system a ground
reference.
3. Set the calibrator voltage to a Test Point value indicated in Tables 4 or 5.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples.
a. Create and configure an AI voltage task on the NI 9222/9223 according to Table 2.
b. Configure the AI voltage task timing according to Table 3.
c. Start the task.
d. Average the readings.
e. Clear the task.
Table 2. NI 9222/9223 Configuration for Accuracy Verification
Min (V) Max (V) Scaled Units Terminal Configuration
-10 10 Volts Differential
Table 3. Timing Configuration
Module Sample Mode Samples per Channel Rate
NI 9222 Finite Sample 50 k 500 k
NI 9223 Finite Sample 100 k 1 M
NI 9222/9223
with Screw-Terminal
Calibrator
AIx–
AIx+
–
+
NI 9222/23
with BNCCalibrator
+
AIx
–
–
+

NI 9222/9223 Calibration Procedure |© National Instruments |5
6. Compare the average to the limits in Tables 4 or 5.
Note The test limits listed in Tables 4 or 5 are derived using the values in Table 7.
7. Set the calibrator to Standby mode (STBY).
8. Repeat steps 3 through 6 for each test point.
9. Disconnect the calibrator from the device.
10. Repeat steps 2 through 9 for each channel.
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9222/9223.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9222/9223.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9222/9223 to the calibrator as shown in Figure 1.
Note If the calibrator outputs are truly floating, the negative output must be
connected to a quiet earth ground as well as AI- to give the entire system a ground
reference.
Table 4. NI 9222 Verification Limits for Accuracy
Range (V) Test Point 1-Year Limits (V)
Minimum Maximum Location Value (V) Lower Limit Upper Limit
-10.000 10.000 Positive FS 9.500000 9.494589 9.505411
-10.000 10.000 Mid 0.000000 -0.002466 0.002466
-10.000 10.000 Negative FS -9.500000 -9.505411 -9.494589
Table 5. NI 9223 Verification Limits for Accuracy
Range (V) Test Point 1-Year Limits (V)
Minimum Maximum Location Value (V) Lower Limit Upper Limit
-10.000 10.000 Positive FS 9.500000 9.493485 9.506515
-10.000 10.000 Mid 0.000000 -0.002430 0.002430
-10.000 10.000 Negative FS -9.500000 -9.506515 -9.493485

6|ni.com |NI 9222/9223 Calibration Procedure
3. Adjust the NI 9222/9223.
a. Initialize a calibration session on the NI 9222/9223. The default password is NI.
b. Input the external temperature in degrees Celsius.
c. Call the NI 9222/9223 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9222/9223.
d. Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e. Set the calibrator to Operate mode (OPR).
f. Call and configure the NI 9222/9223 adjustment function according to Table 6.
g. Set the calibrator to Standby mode (STBY).
h. Repeat steps d through g for each calibration voltage in the array.
i. Close the calibration session.
4. Disconnect the NI 9222/9223 from the calibrator.
5. Repeat steps 1 through 4 for each channel on the NI 9222/9223.
EEPROM Update
When an adjustment procedure is completed, the NI 9222/9223 internal calibration memory
(EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by initializing an external calibration,
setting the C Series calibration temperature, and closing the external calibration.
Reverification
Repeat the Verification section to determine the As-Left status of the device.
Note If any test fails Reverification after performing an adjustment, verify that you
have met the Test Conditions before returning your device to NI. Refer to Worldwide
Support and Services for assistance in returning the device to NI.
Table 6. Adjustment Configuration
Physical Channel Reference Value
cDAQMod8/aixThe reference value from the array of adjustment points

NI 9222/9223 Calibration Procedure |© National Instruments |7
Accuracy Under Calibration Conditions
The values in the following table are based on calibrated scaling coefficients, which are stored
in the onboard EEPROM.
The following accuracy table is valid for calibration under the following conditions:
• Ambient temperature 23 °C ±5 °C
• NI 9222/9223 installed in slot 8 of an NI cDAQ-9178 chassis
• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty
Note The test limits listed in Tables 4 and 5 are derived using the values in Table 7.
Note For operational specifications, refer to the most recent NI 9222/9223
Operating Instructions and Specifications online at ni.com/manuals.
Worldwide Support and Services
The National Instruments website 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.
Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and
other services.
Visit ni.com/register to register your National Instruments product. Product registration
facilitates technical support and ensures that you receive important information updates from NI.
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.
Table 7. NI 9222/9223 Accuracy Under Calibration Conditions
Module Gain Error Offset Error (mV)
NI 9222 0.031% 2.466
NI 9223 0.043% 2.430

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374922C-01 Jul14
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