National Instruments 9211 Manuel

CALIBRATION PROCEDURE

NI 9211

This document contains the verification and adjustment procedures for the National Instruments

9211. 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....................................................................................................... 4

Adjustment................................................................................................................................ 5

Accuracy Adjustment ....................................................................................................... 5

EEPROM Update ..................................................................................................................... 6

Re-Verification ......................................................................................................................... 6

Accuracy Under Calibration Conditions .................................................................................. 6

Where to Go for Support .......................................................................................................... 7

Software

Calibrating the NI 9211 requires the installation of NI-DAQmx 9.2 or later on the calibration

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

LabVIEW, LabWindows™/CVI™, 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 9211 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9211, 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 9211 Operating Instructions and Specifications

NI 9211 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 5520A locked in

the 3.3 V range

A high-precision voltage source with ≤7μV of

uncertainty at 75 mV and ≤2μV of uncertainty

at 0 V and an output impedance <5 Ω.

Chassis NI cDAQ-9178 —

Connection

Accessory

NI 9932 —

NI 9211 Calibration Procedure |© National Instruments Corporation |3

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9211 meets

published specifications.

• Keep connections to the NI 9211 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 9211 are secure.

• Use shielded copper wire for all cable connections to the NI 9211. Use twisted-pairs wire

to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 10 minutes to ensure that the NI 9211 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9211.

1. Install NI-DAQmx.

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

3. Connect the NI cDAQ-9178 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 NI cDAQ-9178 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 NI cDAQ-9178 chassis. Leave slots 1 through 7 of the

NI cDAQ-9178 chassis empty.

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

6. Connect the power source to the NI 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 9211 and assumes that adequate traceable uncertainties are

available for the calibration references.

4|ni.com |NI 9211 Calibration Procedure

Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9211.

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

2. Connect the NI 9211 to the calibrator as shown in Figure 1.

Figure 1. Accuracy Verification Connections

3. Set the calibrator output 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 channel according to Table 2.

b. Configure the AI voltage channel timing according to Table 3.

c. Start the task.

d. Read samples from the NI 9211.

e. Average the samples for each channel.

f. Clear the task.

Table 2. NI 9211 AI Voltage Channel Configuration

Input Terminal

Configuration

Minimum

Value (V)

Maximum

Value (V)

Physical

Channels Units Autozero

Differential -0.08 0.08 cDAQMod8/ai0:3 Volts Every

Sample

Table 3. NI 9211 Timing Configuration

Samples Per Channel Sample Mode Rate (S/s)

100 Finite 7

Calibrator

NI 9211

TC3–

COM

TC3+

TC2–

TC2+

TC1–

TC1+

TC0–

TC0+

Guard

NI 9211 Calibration Procedure |© National Instruments Corporation |5

6. Compare the average sample for each channel to the test limits in Table 4.

Note The test limits listed in Table 4 are derived using the values in Table 6.

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

8. Repeat steps 3 through 7 for each test point in Table 4.

9. Disconnect the calibrator from the NI 9211.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9211.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9211.

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

2. Connect the NI 9211 to the calibrator as shown in Figure 1.

3. Set the calibrator output to 0.07 V.

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

5. Adjust the NI 9211.

a. Open a calibration session on the NI 9211.

b. Input the external temperature in degrees Celsius.

c. Call and configure the NI 9211 adjustment function according to Table 5.

d. Close the calibration session.

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

7. Disconnect the calibrator from the NI 9211.

Table 4. NI 9211 Test Limits

Test Point 1-Year Limits

Location Value (V) Lower Limit (V) Upper Limit (V)

Max 0.075000 0.074959 0.075041

Mid 0-0.000013 0.000013

Min -0.075000 -0.075041 -0.074959

Table 5. Adjustment Configuration

Physical Channels Reference Value

cDAQMod8/ai0:3 0.07

6|ni.com |NI 9211 Calibration Procedure

EEPROM Update

When an adjustment procedure is completed, the NI 9211 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.

Re-Verification

Repeat the Verification section to determine the As-Left status of the device.

Note If any test fails Re-Verification 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 9211 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 9211 Operating

Instructions/User Guide and Specifications online at ni.com/manuals.

Table 6. NI 9211 Accuracy Under Calibration Conditions

Gain Error Offset Error

370 ppm 13 μV

372137B-01 Mar13

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

legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance

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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