National Instruments NI 9269 Manual

NI-9269

CALIBRATION PROCEDURE
NI 9269
This document contains the verification and adjustment procedures for the
National Instruments 9269. For more information about calibration solutions, visit ni.com/
calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 3
Initial Setup............................................................................................................................... 3
Verification ............................................................................................................................... 3
Accuracy Verification....................................................................................................... 3
Adjustment................................................................................................................................ 5
Accuracy Adjustment ....................................................................................................... 5
EEPROM Update ..................................................................................................................... 6
Reverification ........................................................................................................................... 6
Accuracy Under Calibration Conditions .................................................................................. 6
Where to Go for Support .......................................................................................................... 7
Software
Calibrating the NI 9269 requires the installation of NI-DAQmx 9.6 or later on the calibration
system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports
LabVIEW, LabWindows™/CVI™, ANSI C, and .NET. When you install NI-DAQmx, you only
need to install support for the application software that you intend to use.

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Documentation
Consult the following documents for information about the NI 9269, 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 Quick Start
NI-DAQmx installation and hardware setup
NI 9269 Operating Instructions and Specifications
NI 9269 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
DMM NI 4070 DMM Use a multiranging 6 1/2 digit
DMM with a voltage accuracy of
±40 ppm.
Chassis NI cDAQ-9178 —

NI 9269 Calibration Procedure |© National Instruments |3
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9269 meets
published specifications.
• Keep connections to the NI 9269 as short as possible. Long cables and wires act as
antennae, picking up extra noise that can affect measurements.
• Verify that all connections to the NI 9269 are secure.
• Use shielded copper wire for all cable connections to the NI 9269. Use twisted-pair wire to
eliminate noise and thermal offsets.
• Maintain an ambient temperature of 23 °C ± 5 °C. The NI 9269 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 9269 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9269.
1. Install NI-DAQmx.
2. Make sure that the NI cDAQ-9178 power source is not connected.
3. Insert the module into 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 device is working
properly.
Verification
The following performance verification procedure describes the sequence of operation and test
points required to verify the NI 9269 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 9269.
1. Set the DMM to Standby mode (STBY).
2. Connect the DMM to the NI 9269 as shown in Figure 1.

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Figure 1. Accuracy Verification Connections
3. Set the DMM to read DC voltage in the minimum range required to cover the NI 9269
output range of ±10 V.
4. Acquire a sample.
a. Create and configure an AO voltage channel according to Table 2.
b. Start the task.
c. Generate a voltage output according to Table 3.
d. Wait the appropriate amount of time for the DMM measurement to settle.
e. Read the NI 9269 output voltage measurement from the DMM.
f. Clear the task.
5. Compare the DMM measurement to the test limits in Table 4.
6. Repeat steps 3 through 5 for each test point in Table 4.
7. Disconnect the DMM from the NI 9269.
8. Repeat steps 1 through 7 for each channel on the NI 9269.
Table 2. NI 9269 AO Voltage Channel Configuration
Input Range
Scaled Units Terminal ConfigurationMin Max
-10 10 Vo l t s Differential
Table 3. NI 9269 Output Configuration
Samples Per Channel Timeout
110.0
NI 9269DMM
AOx–
AOx+
HI
LO

NI 9269 Calibration Procedure |© National Instruments |5
Table 4. NI 9269 Accuracy Verification Test Limits
Note Test limits in Table 4 are derived using the values in Table 6.
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9269.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9269.
1. Adjust the NI 9269.
a. Initialize a calibration session on the NI 9269. The default password is NI.
b. Input the external temperature in degrees Celsius.
c. Call the NI 9269 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9269.
d. Connect the DMM to the NI 9269 as shown in Figure 1.
e. Set the DMM to read DC voltage in the minimum range required to cover the NI 9269
output range of ±10 V.
f. Call and configure the NI 9269 setup calibration function with the DAC value
obtained from the array of recommended calibration voltages.
g. Wait the appropriate amount of time for the DMM measurement to settle.
h. Read the NI 9269 output voltage measurement from the DMM.
i. Call and configure the NI 9269 adjustment function according to Table 5.
j. Repeat steps f to i for each calibration voltage in the array.
k. Close the calibration session.
l. Disconnect the DMM from the NI 9269.
2. Repeat step 1 for each channel on the NI 9269.
Range (V) Test Point 1-Year Limits
Min Max Location Value (V)
Lower
Limit (V)
Upper
Limit (V)
-10.000 10.000 Max 9.500000 9.492730 9.507271
-10.000 10.000 Mid 0.000000 -0.001571 0.001571
-10.000 10.000 Min -9.500000 -9.507271 -9.492730
Table 5. Adjustment Configuration
Physical Channel Reference Value
cDAQMod8/aoxThe NI 9269 output voltage measured from the DMM.

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EEPROM Update
When an adjustment procedure is completed, the NI 9269 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 Where to
Go for Support for assistance in returning the device to NI.
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 9269 installed in slot 8 of an NI cDAQ-9178 chassis
• Slots 1 through 7 of the NI cDAQ-9178 chassis are empty
Table 6. NI 9269 Accuracy Under Calibration Conditions
Note For operational specifications, refer to the most recent NI 9269 Operating
Instructions and Specifications online at ni.com/manuals.
Gain Error Offset Error
0.060% 0.015%
*Range equals 10.47 V

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375931A-01 May13
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