National Instruments 9232 Manual

CALIBRATION PROCEDURE

NI 9230/9232

This document contains the verification and adjustment procedures for the NI 9230 and NI 9232.

For more information on calibration, visit ni.com/calibration.

Contents

Software.................................................................................................................................... 1

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

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

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

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

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

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

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

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

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

Reverification ........................................................................................................................... 6

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

Worldwide Support and Services ............................................................................................. 7

Software

Calibrating the NI 9230/9232 requires the installation of NI-DAQmx on the calibration system.

Table 1 shows the necessary versions for each connector variation.

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.

Table 1. Calibration System Software Requirements

Connector Variation Version Requirements

Screw-Terminal NI-DAQmx 14.5 or later

BNC NI-DAQmx 15.5 or later

2|ni.com |NI 9230/9232 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9230/9232, NI-DAQmx, and

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

software.

NI cDAQ-9174/9178 USB Chassis Quick Start

NI-DAQmx installation and hardware setup

NI 9230 Getting Started Guide

NI 9230 specific information

NI 9230 Datasheet

NI 9230 specifications and calibration interval

NI 9232 Getting Started Guide

NI 9232 specific information

NI 9232 Datasheet

NI 9232 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 9230/9232 Calibration Procedure |© National Instruments |3

Test Equipment

Table 2 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 2.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9230/9232

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 23 °C ±5 °C. The device 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 9230/9232 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9230/9232.

1. Install NI-DAQmx.

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

3. Connect the NI 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 NI 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 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.

Table 2. Recommended Equipment

Equipment

Recommended

Model

Parameter

Measured Requirements

Calibrator Fluke 5700A Accuracy,

Adjustment

Use a high-precision voltage source

with an accuracy ≤100 ppm.

Chassis NI cDAQ-9178 All —

4|ni.com |NI 9230/9232 Calibration Procedure

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 procedures describe the sequence of operation and

provide test points required to verify the NI 9230/9232. The verification procedures assume 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 9230/9232.

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

2. Connect the NI 9230/9232 to the calibrator as shown in Figure 1.

Figure 1. Accuracy Verification Connections

3. Set the calibrator voltage to a Test Point value indicated in Table 5.

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

5. Acquire and average samples of each channel.

a. Create and configure an AI voltage task on the NI 9230/9232 according to Table 3.

Table 3. NI 9230/9232 Configuration for Accuracy Verification

Min (V) Max (V) Scaled Units

Physical

Channels

Channel

Configuration

-30 30 Volts AI0:2 DC Coupled

NI 9230/9232 with

Screw-Terminal

Calibrator

AI1

–

AI0

–

AI2

–

NI 9230/9232

with BNC

Calibrator

AI1

AI0

AI2

–

NI 9230/9232 Calibration Procedure |© National Instruments |5

b. Configure the AI voltage task timing according to Table 4.

c. Start the task.

d. Average the samples acquired for each channel.

e. Stop and Clear the task.

6. Compare the average to the limits in Table 5.

Note The test limits listed in Table 5 are derived using the values in Table 7.

Note The uncertainty of the calibration standard is not included in these limits.

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

8. Repeat steps 3 through 7 for each test point in Table 5.

9. Disconnect the calibrator from the device.

Adjustment

The following performance adjustment procedure describesthe sequence of operation required

to adjust the NI 9230/9232.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9230/9232.

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

2. Connect the NI 9230/9232 to the calibrator as shown in Figure 1.

3. Adjust the NI 9230/9232.

a. Initialize a calibration session on the NI 9230/9232. The default password is NI.

b. Input the external temperature in degrees Celsius.

Table 4. NI 9230/9232 Timing Configuration

Sample Mode Samples Per Channel Rate kS/s

NI 9230 Finite Samples 1280 12.8

NI 9232 Finite Samples 10240 102.4

Table 5. NI 9230/9232 Verification Test Limits for Accuracy

Range Test Point 1-Year Limits

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

-30 30 Max 28.5 28.46853 28.53147

Mid 0.00 -0.007245 0.007245

Min -28.5 -28.53147 -28.46853

6|ni.com |NI 9230/9232 Calibration Procedure

c. Call the NI 9230/9232 DAQmx Get C Series Calibration Adjustment Points function

to obtain an array of recommended calibration voltages for the NI 9230/9232.

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 9230/9232 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 9230/9232 from the calibrator.

EEPROM Update

When an adjustment procedure is completed, the NI 9230/9232 internal calibration memory

(EEPROM) updates immediately.

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 following calibration specifications are valid under the following conditions:

• Ambient temperature 23 ±5 °C

• NI 9230/9232 installed in slot 8 of an NI cDAQ-9178 chassis

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

Table 6. Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixThe reference value from the array of adjustment points

373901G-01 Jun16

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

Note The test limits listed in Table 5 are derived using the values in Table 7.

Note For operational specifications, refer to the most recent NI 9230 Datasheet or

NI 9232 Datasheet 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

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Communities using the manufacturer’s declaration of conformity. This system affords the user

protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC

for your product by visiting ni.com/certification. If your product supports calibration,

you can obtain the calibration certificate for your product at ni.com/calibration.

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provide up-to-date contact information, support phone numbers, email addresses, and current

events.

Table 7. NI 9230/9232 Accuracy Under Calibration Conditions

Percent of Reading (Gain Error) Percent of Range*(Offset Error)

0.085% 0.023%

*Range equals 31.5 V

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