National Instruments NI 9223 Handbuch

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

DeutschFrançais

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

374922C-01 Jul14

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

product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National

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

National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party

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NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR

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