National Instruments NI 9226 Handbuch

NI-9226

CALIBRATION PROCEDURE

NI 9216/9226

8-Channel, 400 S/s Aggregate, 0 Ωto 400 Ω/4000 Ω,

PT100 RTD/PT1000 RTD C Series Temperature Input Module

This document contains the verification and adjustment procedures for the NI 9216 and NI 9226.

In this document, the NI 9216 and NI 9226 are inclusively referred to as NI 9216/9226. 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

Accuracy Verification....................................................................................................... 4

Adjustments .............................................................................................................................. 6

Accuracy Adjustment ....................................................................................................... 6

EEPROM Update ..................................................................................................................... 7

Reverification ........................................................................................................................... 7

Accuracy Under Calibration Conditions .................................................................................. 7

Worldwide Support and Services ............................................................................................. 8

Software

Calibrating the NI 9216/9226 requires the installation of NI-DAQmx 14.5 or later on the

calibration system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx

supports LabVIEW, LabWindows™/CVI™, ANSI C, Microsoft Visual C++, Microsoft Visual

Basic .NET, and Microsoft Visual C#. When you install NI-DAQmx you only need to install

support for the application software that you intend to use.

2|ni.com |NI 9216/9226 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9216/9226, NI-DAQmx, and

your application software. All documents are available on ni.com and help files install with the

software.

NI cDAQ-9174/9178 Quick Start Guide

NI-DAQmx installation and hardware setup

NI 9216 Getting Started Guide

NI 9216 connection information

NI 9216 Datasheet

NI 9216 circuitry and specifications

NI 9226 Getting Started Guide

NI 9226 connection information

NI 9226 Datasheet

NI 9226 circuitry and specifications

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

NI 9216/9226 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 9216/9226

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 20 °C to 28 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 10 minutes to ensure that the NI 9216/9226 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9216/9226.

1. Install NI-DAQmx.

2. Make sure the cDAQ-9178 power source is not connected to the chassis.

3. Connect the cDAQ-9178 chassis to the system safety ground.

a. Attach a ring lug to a 14 AWG (1.6 mm) wire.

b. Connect the ring lug to the ground terminal on the side of the cDAQ-9178 chassis

using the ground screw.

c. Attach the other end of the wire to the system safety ground.

4. Install the module in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the

cDAQ-9178 chassis empty.

5. Connect the cDAQ-9178 chassis to your host computer.

Table 1. Recommended Equipment

Equipment

Recommended

Models Requirements

Calibrator Fluke 5522A Use a high-precision resistance source with gain

accuracy ≤40 ppm and offset error ≤2 mΩ for the

NI 9216 and offset error ≤20 mΩ for the NI 9226.

Chassis cDAQ-9178 —

4|ni.com |NI 9216/9226 Calibration Procedure

6. Connect the power source to the cDAQ-9178 chassis.

7. Launch Measurement & Automation Explorer (MAX).

8. Right-click the device name and select Self-Test to ensure that the module is working

properly.

Verification

The following performance verification procedure describes the sequence of operation and test

points required to verify the NI 9216/9226. The verification procedure 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 9216/9226.

1. Set the calibrator to Standby mode (STBY).

2. Connect the desired channel of the NI 9216/9226 to the calibrator as shown in Figure 1.

Connect only one channel at a time.

Figure 1. 4-Wire Resistance Connections

3. Set the calibrator as a resistance source to a Test Point value indicated in Table 2.

4. Set calibrator COMP to 4-wire.

Table 2. NI 9216/9226 Accuracy Verification Test Limits

Module

Range Test Point 1-Year Limits

Minimum

(Ω)

Maximum

(Ω)Value (Ω)

Upper

Limit (Ω)

Lower

Limit (Ω)

NI 9216 0 400

00.03 -0.03

100 100.042 99.958

320 320.0684 319.9316

NI 9226 0 4000

00.3 -0.3

1000 1000.43 999.57

3200 3200.72 3199.28

EX+

AUX LO

AUX HI

EX–

RTD–

RTD+

NI 9216/9226

CALIBRATOR 4-Wire Connection

NI 9216/9226 Calibration Procedure |© National Instruments |5

Note The limits are only based on the NI 9216/9226 accuracy. The uncertainty of

calibration standard is not included.

Note The test limits listed in Table 2 are derived using the values in Table 6.

5. Set the calibrator to Operate mode (OPR).

6. Acquire and average samples from one channel.

a. Create and configure a 4-wire AI resistance task on the NI 9216/9226 according to

Table 3.

b. Configure the ADC Timing Mode to High Resolution.

Note Use appropriate channel number in place of “x” in “AIx.” For example, use

AI3 for channel 3.

c. Configure the task timing according to Table 4.

d. Start the task.

e. Read the samples from the NI 9216/9226.

f. Average the samples.

g. Stop and clear the task.

7. Compare the per-channel averages to the limits in Table 2.

8. Set the calibrator to Standby mode (STBY).

9. Repeat steps 3 through 8 for each test point listed in Table 2.

10. Disconnect the NI 9216/9226 channel from the calibrator.

11. Repeat steps 2 through 10 for any other desired channel of NI 9216/9226.

Table 3. NI 9216/9226 Voltage Configuration

Module Physical Channel

Range

Minimum (Ω)Maximum (Ω)

NI 9216 AIx 0 400

NI 9226 AIx 0 4000

Table 4. NI 9216/9226 Task Timing Configuration

Sample Mode Samples Per Channel Rate (S/s)

Finite Samples 10 5

6|ni.com |NI 9216/9226 Calibration Procedure

Adjustments

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9216/9226.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9216/9226.

1. Set the calibrator to Standby mode (STBY).

2. Connect the desired channel of the NI 9216/9226 to the calibrator as shown in Figure 1.

Connect only one channel at a time.

3. Adjust the desired channel of the NI 9216/9226.

a. Initialize a calibration session on the NI 9216/9226. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call the DAQmx Get NI 9216/9226 Calibration Adjustment Points function to obtain

an array of recommended calibration resistance values.

d. Set the calibrator to a reference value determined by the array of recommended

calibration voltages.

e. Set calibrator COMP to 4-wire.

f. Set the calibrator to Operate mode (OPR).

g. Call and configure the NI 9216/9226 adjustment function according to Table 5.

Note Use appropriate channel number in place of “x” in “AIx.” For example, use

AI3 for channel 3.

Note The module acquisition is started each time the adjust function is called.

h. Set the calibrator to Standby mode (STBY).

i. Repeat steps d through h for each point in the array.

j. Close the calibration session with action commit.

4. Disconnect the NI 9216/9226 channel from the calibrator.

5. Repeat steps 2 through 4 to calibrate any other desired channel of NI 9216/9226.

Table 5. Gain Adjustment Configuration

Physical Channel Reference Value

AIx The reference resistance value from the array

of adjustment points

NI 9216/9226 Calibration Procedure |© National Instruments |7

EEPROM Update

When an adjustment procedure is completed, the NI 9216/9226 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.

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 20 °C to 28 °C

• NI 9216/9226 installed in slot 8 of an cDAQ-9178 chassis

• Slots 1 through 7 of the cDAQ-9178 chassis are empty

Note For operational specifications, refer to the most recent NI 9216 Datasheet or

NI 9226 Datasheet online at ni.com/manuals.

Table 6. NI 9216/9226 Accuracy Under Calibration Conditions

Module Gain Error Offset Error

NI 9216 ±0.012% ±0.03 Ω

NI 9226 ±0.013% ±0.3 Ω

375425C-01 Oct18

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limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

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support you have access to everything from troubleshooting and application development

self-help resources to email and phone assistance from NI Application Engineers.

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