National Instruments NI 9209 Manual

CALIBRATION PROCEDURE
NI 9209
16-Channel Differential/32-Channel Single-Ended, ±10 V, 24-Bit
Analog Input Module
This document contains the verification and adjustment procedures for the NI 9209. For more
information about calibration solutions, visit ni.com/calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Test Conditions......................................................................................................................... 3
Initial Setup............................................................................................................................... 3
Verification ............................................................................................................................... 4
Differential Voltage Accuracy Verification ..................................................................... 4
Single-Ended Voltage Accuracy Verification .................................................................. 6
Adjustments .............................................................................................................................. 7
Voltage Accuracy Adjustment.......................................................................................... 7
EEPROM Update ..................................................................................................................... 8
Reverification ........................................................................................................................... 8
Accuracy Under Calibration Conditions .................................................................................. 9
Worldwide Support and Services ............................................................................................. 9
Software
Calibrating the NI 9209 requires the installation of NI-DAQmx 15.1 or later on the calibration
system. 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.

2|ni.com |NI 9209 Calibration Procedure
Documentation
Consult the following documents for information about the NI 9209, NI-DAQmx, and your
application software. All documents are available on ni.com and help files install with the
software.
NI cDAQ-9174/9178 USB Chassis Quick Start
NI-DAQmx installation and hardware setup
NI 9209 Getting Started Guide
NI 9209 specific information.
NI 9209 Datasheet
NI 9209 specifications and calibration interval.
NI DAQmx Help
Information about creating applications that use the NI-DAQmx driver
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

NI 9209 Calibration Procedure |© National Instruments |3
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.
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9209 meets
published specifications.
• Keep connections to the device as short as possible. Long cables and wires act as antennas,
picking up extra noise that can affect measurements.
• Verify that all connections to the device are secure.
• Use shielded copper wire for all cable connections to the device. Use twisted-pairs wire to
eliminate noise and thermal offsets.
• Maintain an ambient temperature of 23 ± 5 °C. The device 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 9209 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9209.
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.
Table 1. Recommended Equipment
Equipment
Recommended
Model Minimum Requirements
Source Fluke 5500A Use a source with gain error ≤260 ppm and an
offset error ≤70 uV.
cDAQ Chassis NI cDAQ-9178 —
Connection
Accessory
NI 9923 —

4|ni.com |NI 9209 Calibration Procedure
6. Launch Measurement & Automation Explorer (MAX).
7. Right-click the device name and select Self-Test to ensure that the module is working
properly.
Verification
The following performance verification procedures describe the sequence of operation and test
points required to verify the NI 9209 and assumes that adequate traceable uncertainties are
available for the calibration references.
Differential Voltage Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9209.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9209 to the calibrator as shown in Figure 1.
Figure 1. Differential Voltage Accuracy Connections
Note If the calibrator outputs are truly floating, connect the negative output to a
quiet earth ground as well as COM to give the entire system a ground reference.
3. Set the calibrator voltage to a Test Point value indicated in Table 4.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples.
a. Create and configure an AI voltage task on the NI 9209 according to Table 2.
1 Connections when using a calibrator with a guard connection.
2 Connections when using a calibrator with no guard connection.
Table 2. NI 9209 Configuration for Voltage Accuracy Verification
Input Range
Scaled Units Terminal ConfigurationMin Max
-10 10 Volts Differential
NI 9209Calibrator
AIx–
AIx+
COM
HI
LO
Guard
NI 9209Calibrator
AIx–
AIx+
COM
HI
LO
12

NI 9209 Calibration Procedure |© National Instruments |5
b. Configure the AI voltage task according to Table 3. Set the ADC timing mode to
high-resolution.
c. Start the task.
d. Average the readings.
e. Stop and clear the task.
6. Compare the average to the limits in Table 4.
Note The test limits listed in Table 4 are derived using the values in Table 8.
Note The uncertainty of the calibration standard is not included in these limits.
7. Repeat step 5 and 6 with the ADC timing mode on the NI 9209 set to high-speed.
8. Set the calibrator to Standby mode (STBY).
9. Repeat steps 3 through 8 for each test point listed in Table 4.
10. Disconnect the calibrator from the device.
11. Repeat steps 1 through 10 for each voltage channel on the NI 9209.
Table 3. NI 9209 Voltage Timing Configuration
ADC Timing
Mode Sample Mode Samples to Read Sample Rate
High-Resolution N Samples 519 S/s
High-Speed N Samples 75 500 S/s
Table 4. NI 9209 Verification Test Limits for Differential Voltage Accuracy
Range (V) Test Point 2-Year Limits
Minimum Maximum Location
Value
(V)
Lower Limit
(V)
Upper Limit
(V)
-10.00000 10.00000 Pos FS 10.00000 9.98972 10.01028
-10.00000 10.00000 Mid 0.00000 -0.00058 0.00058
-10.00000 10.00000 Neg FS -10.00000 -10.01028 -9.98972

6|ni.com |NI 9209 Calibration Procedure
Single-Ended Voltage Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9209.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9209 to the calibrator as shown in Figure 2.
Figure 2. Single-Ended Voltage Accuracy Connections
Note If the calibrator outputs are truly floating, connect the negative output to a
quiet earth ground as well as COM to give the entire system a ground reference.
3. Set the calibrator voltage to a Test Point value indicated in Table 6.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples.
a. Create and configure an AI voltage task on the NI 9209 according to Table 5.
b. Configure the AI voltage task according to Table 3 on page 5. Set the ADC timing
mode to high-resolution.
c. Start the task.
d. Average the readings.
e. Clear the task.
1 Connections when using a calibrator with a guard connection.
2 Connections when using a calibrator with no guard connection.
Table 5. NI 9209 Configuration for Voltage Accuracy Verification
Input Range
Scaled Units Terminal ConfigurationMin Max
-10 10 Vo l t s Single-Ended/RSE
NI 9209Calibrator
COM
AIx
HI
LO
Guard
NI 9209Calibrator
COM
AIx
HI
LO
1 2

NI 9209 Calibration Procedure |© National Instruments |7
6. Compare the average to the limits in Table 6.
Table 6. NI 9209 Verification Test Limits for Single-Ended Voltage Accuracy
Note The test limits listed in Table 6 are derived using the values in Table 8.
Note The uncertainty of the calibration standard is not included in these limits.
7. Repeat step 5 and 6 with the ADC timing mode on the NI 9209 set to high-speed.
8. Set the calibrator to Standby mode (STBY).
9. Repeat steps 3 through 8 for each test point listed in Table 6.
10. Disconnect the calibrator from the device.
11. Repeat steps 1 through 10 for each voltage channel on the NI 9209.
Adjustments
The following performance adjustment procedures describe the sequence of operation required
to adjust the NI 9209.
Voltage Accuracy Adjustment
Complete the following procedure to adjust the voltage accuracy performance of the NI 9209.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9209 to the calibrator as shown in Figure 1.
3. Adjust the NI 9209 voltage accuracy.
a. Initialize a calibration session on the NI 9209. The default password is NI.
b. Input the external temperature in degrees Celsius.
c. Call the DAQmx Get 9209 Calibration Adjustment Points function to obtain an array
of recommended calibration voltages for the NI 9209.
d. Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e. Set the calibrator to Operate mode (OPR).
Range (V) Test Point 2-Year Limits
Minimum Maximum Location
Value
(V)
Lower Limit
(V)
Upper Limit
(V)
-10.00000 10.00000 Pos FS 10.00000 9.99014 10.00986
-10.00000 10.00000 Mid 0.00000 -0.00056 0.00056
-10.00000 10.00000 Neg FS -10.00000 -10.00986 -9.99014

8|ni.com |NI 9209 Calibration Procedure
f. Call and configure the NI 9209 gain instance of the adjustment function according to
Table 7 with the input terminal configuration set to Differential.
g. Set the calibrator to Standby mode (STBY).
h. Repeat steps d through g for each calibration voltage in the array.
i. Repeat steps d through h for each channel.
j. Repeat steps d through i with the input terminal configuration set to
Single-Ended/RSE as shown in Figure 2.
k. Disconnect the calibrator from the NI 9209.
l. Short the voltage channels to the NI 9209 AIGND.
m. Call the DAQmx Adjust 9209 Offset Calibration for the physical channel(s) adjusted
in the RSE and Differential sections. For example, if you adjusted all the channels,
then the physical channels should be cDAQ1Mod8/ai0:31.
Note If adjusting the channel(s) in differential and single-ended mode, the physical
channel(s) should be a union of the channels specified in both configurations.
n. Close and commit the calibration session.
4. Remove the connections from the NI 9209.
EEPROM Update
When an adjustment procedure is completed, the NI 9209 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 7. Gain Adjustment Configuration
Physical Channel Reference Value
cDAQMod8/aixThe reference value from the array of adjustment points

NI 9209 Calibration Procedure |© National Instruments |9
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 9209 installed in slot 8 of an NI cDAQ-9178 chassis
• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty
Note For operational specifications, refer to the most recent NI 9209 Datasheet
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 8. NI 9209 Accuracy Under Calibration Conditions
Input Channels Percentage of Reading Percentage of Range*
Differential 0.097% 0.0055%
Single-Ended 0.093% 0.0053%
* Range equals 10.4 V for voltage.

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376908B-01 Jul16
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