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.

2|ni.com |NI 9269 Calibration Procedure

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.

4|ni.com |NI 9269 Calibration Procedure

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+

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.

6|ni.com |NI 9269 Calibration Procedure

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

375931A-01 May13

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National Instruments trademarks. Other

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Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the

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for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data.

Where to Go for Support

The National Instruments Web site 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.

National Instruments corporate headquarters is located at 11500 North Mopac Expressway,

Austin, Texas, 78759-3504. National Instruments also has offices located around the world to

help address your support needs. For telephone support in the United States, create your service

request at ni.com/support and follow the calling instructions or dial 512 795 8248. For

telephone support outside the United States, visit the Worldwide Offices section of ni.com/

niglobal to access the branch office Web sites, which provide up-to-date contact information,

support phone numbers, email addresses, and current events.

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