National Instruments 9238 Gebrauchs- und Pflegehandbuch

CALIBRATION PROCEDURE

NI 9238

4-Channel, ±0.5 V, 24-Bit Simultaneous, Channel-to-Channel Isolated

Analog Input Module

This document contains the verification and adjustment procedures for the NI 9238. 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............................................................................................................................... 4

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

Adjustment................................................................................................................................ 6

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

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

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

Software

Calibrating the NI 9238 requires the installation of NI-DAQmx 14.1 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 9238 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9238, 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 9238 Operating Instructions and Specifications

NI 9238 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 mapping C enums to .NET enums

Table 1. Recommended Equipment

Equipment

Recommended

Model Requirements

Calibrator Fluke 5500A Use a high-precision voltage source with an accuracy

of ≤60 ppm and offset error ≤6µV.

Chassis NI cDAQ-9178 —

NI 9238 Calibration Procedure |© National Instruments |3

Test Conditions

The following setup and environmental conditions are required to allow the NI 9238 to meet the

performance levels shown in Table 2:

• Keep connections to the NI 9238 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 NI 9238 are secure.

• Use shielded copper wire for all cable connections to the NI 9238. 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 9238 measurement

circuitry is at a stable operating temperature.

Initial Setup

Refer to the NI cDAQ-9174/9178 Quick Start for information about how to install the software

and hardware and how to configure the device in Measurement & Automation Explorer (MAX).

Complete the following steps to set up the NI 9238.

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. Use the ground screw to connect the ring lug to the ground terminal on the side of the

NI cDAQ-9178.

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 MAX.

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

properly.

4|ni.com |NI 9238 Calibration Procedure

Verification

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

points required to verify the NI 9238. The verification procedure assumes that the calibration

references have traceable uncertainties that meet the requirements listed in the Test Equipment

section.

Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9238.

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

2. Connect the NI 9238 to the calibrator, as shown in Figure 1.

Figure 1. NI 9238 Calibration Connections

3. Set the calibrator voltage to a selected Test Point value in Table 2.

A properly functioning NI 9238, when calibrated according to the conditions described in

this document, can be expected to have gain and offset errors within the limits shown.

The following accuracy table is valid for calibration under the following conditions:

• Ambient temperature 23 °C ± 5 °C

• Slot 8 of the NI cDAQ-9178 chassis is occupied by the NI 9238

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

Calibrator

NI 9238

AI3–

AI3+

AI2–

AI2+

AI1–

AI1+

AI0–

AI0+

NI 9238 Calibration Procedure |© National Instruments |5

Note Values in Table 2 should be used for calibration verification only. These

values only apply under the specific calibration conditions described in this

document, and are not to be construed as general operational specifications of the

NI 9238. For operational specifications, refer to the most recent NI 9238 Operating

Instructions and Specifications at ni.com/manuals.

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

5. Acquire and average samples.

a. Create and configure an AI voltage task according to Table 3.

b. Configure the task timing according to Table 4.

c. Start the task.

d. Read samples from the NI 9238.

e. Average the samples.

f. Clear the task.

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

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

8. Repeat steps 3 through 7 for each test point in Table 2.

9. Disconnect the NI 9238 from the calibrator.

Table 2. NI 9238 Accuracy Verification Test Limits

Range

Test Point

(V)

1-Year Limits

Minimum

(V)

Maximum

(V)

Upper Limit

(V)

Lower Limit

(V)

-0.5 0.5 -0.45 -0.44956 -0.45044

0 0.00006 -0.00006

0.45 0.45044 0.44956

Table 3. NI 9238 Voltage Task Configuration

Physical Channels

Range

Minimum (V) Maximum (V)

AI0:3 -0.5 0.5

Table 4. NI 9238 Task Timing Configuration

Sample Mode Samples per Channel Rate (kS/s)

Finite Samples 5000 50

6|ni.com |NI 9238 Calibration Procedure

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9238.

Complete the following procedure to adjust the accuracy performance of the NI 9238.

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

2. Connect the NI 9238 to the calibrator, as shown in Figure 1.

3. Adjust the NI 9238.

a. Initialize a calibration session on the NI 9238. The default password is NI.

b. Input the external temperature in degrees Celsius using the set temperature C Series

function.

c. Call the NI 9238 get C Series adjustment points function to obtain an array of

recommended calibration voltages for the NI 9238.

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 9238 adjustment function according to Table 5.

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

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.

j. Clear the task.

4. Disconnect the NI 9238 from the calibrator.

EEPROM Update

When an adjustment procedure is completed, the NI 9238 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.

Table 5. Accuracy Adjustment Configuration

Physical Channel Reference Value

cDAQMod8/aixA reference value from the array of adjustment points.

374757A-01 Jul15

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. NI MAKES

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

ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable

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

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 conditions listed in the Test Conditions section before returning your

device to NI. Refer to the Where to Go for Support section for assistance in returning

the device to NI.

Where to Go for Support

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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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

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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

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