National Instruments 9220 Manuale

CALIBRATION PROCEDURE

NI 9220

This document contains the verification and adjustment procedures for the National

Instruments 9220. In this document, the NI 9220 with spring terminal and the NI 9220 with

DSUB are referred to inclusively as the NI 9220. For more information about calibration

solutions, visit ni.com/calibration.

Contents

Software Requirements............................................................................................................. 2

Documentation.......................................................................................................................... 2

Test Equipment......................................................................................................................... 3

Test Conditions......................................................................................................................... 3

Initial Setup............................................................................................................................... 3

Verification ............................................................................................................................... 4

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

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

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

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

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

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

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

ni.com/manuals

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2|ni.com |NI 9220 Calibration Procedure

Software Requirements

Calibrating the NI 9220 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.

Documentation

Consult the following documents for information about the NI 9220, 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

NI-DAQmx installation and hardware setup

NI 9220 User Guide and Specifications

NI 9220 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

NI 9220 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 9220 meets

published specifications.

• Keep connections to the NI 9220 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 9220 are secure.

• Use shielded copper wire for all cable connections to the NI 9220. 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 9220 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9220.

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.

Table 1. Recommended Equipment

Equipment

Recommended

Model Requirements

Calibrator Fluke 5700A Use a high-precision voltage source with an

accuracy of ≤15 ppm and an output impedance

of ≤50 Ω.

Chassis NI cDAQ-9178 —

DSUB Connection

Accessory

NI 9923 —

4|ni.com |NI 9220 Calibration Procedure

Verification

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

points required to check the NI 9220 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 9220.

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

2. Connect the NI 9220 to the calibrator as shown in Figure 1.

Figure 1. Accuracy Verification Connections

Note If the calibrator outputs are truly floating, connect the negative output to a

quiet earth ground as well as COM to give the entire system a ground reference.

3. Set the calibrator voltage 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.

1 Connections when using a calibrator with a guard connection.

2 Connections when using a calibrator with no guard connection.

Table 2. NI 9220 AI Voltage Channel Configuration

Input Range

Scaled Units Terminal ConfigurationMin Max

-10 10 Vo l t s Differential

NI 9220Calibrator

AIx–

AIx+

COM

Guard

NI 9220Calibrator

AIx–

AIx+

COM

NI 9220 Calibration Procedure |© National Instruments |5

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

c. Start the task.

d. Read samples from the NI 9220.

e. Average the samples.

f. Clear the task.

6. Compare the average of the samples to the test limits in Table 4.

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

7. Repeat steps 3 through 6 for each Test Point in Table 4.

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

9. Disconnect the NI 9220 from the calibrator.

10. Repeat steps 1 through 9 for each channel on the NI 9220.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9220.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9220.

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

2. Connect the NI 9220 to the calibrator as shown in Figure 1.

3. Adjust the NI 9220.

a. Initialize a calibration session on the NI 9220. The default password is NI.

b. Input the external temperature in degrees Celsius.

Table 3. NI 9220 Timing Configuration

Samples Per Channel Acquisition Mode Rate (kS/s)

10,000 Finite 100

Table 4. NI 9220 Test Limits

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 9.498485 9.501515

-10.000 10.000 Mid 0.000000 -0.00028 0.00028

-10.000 10.000 Min -9.500000 -9.501515 -9.498485

6|ni.com |NI 9220 Calibration Procedure

c. Call the NI 9220 get C Series adjustment points function to obtain an array of

recommended calibration voltages for the NI 9220.

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 9220 adjustment function according to Table 5.

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 9220 from the calibrator.

5. Repeat steps 1 through 4 for each channel on the NI 9220.

EEPROM Update

When an adjustment procedure is completed, the NI 9220 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 section for assistance in returning the device to NI.

Table 5. Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixThe reference value from the array of adjustment points

372220A-01 Oct12

CVI, LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are trademarks of National

Instruments Corporation. Refer to the Trademark Information at ni.com/trademarks for other National Instruments trademarks. The mark

LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States

and other countries. 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. 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.

Accuracy Under Calibration Conditions

The following calibration specifications are valid under the following conditions:

• Ambient temperature 23 ±5 °C

• NI 9220 installed in slot 8 of an NI cDAQ-9178 chassis

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

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

Note For operational specifications, refer to the most recent NI 9220 User Guide

and Specifications online at ni.com/manuals.

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.

Table 6. NI 9220 Accuracy Under Calibration Conditions

Gain Error Offset Error

0.013% 0.28 mV

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