National Instruments CDAQ Manual

CALIBRATION PROCEDURE

NI cDAQ Chassis

This document contains information for calibrating the National Instruments cDAQ chassis. For more

information on calibration, visit ni.com/calibration.

Contents

Software Requirements........................................................................................................................ 1

Documentation Requirements.............................................................................................................. 1

Calibration Interval .............................................................................................................................. 2

Test Equipment .................................................................................................................................... 2

Test Conditions .................................................................................................................................... 2

Calibration Procedures......................................................................................................................... 2

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

Verification .................................................................................................................................. 3

Where to Go for Support ..................................................................................................................... 4

Software Requirements

Calibrating the NI cDAQ chassis requires installing the latest NI-DAQmx driver on the calibration

system. You can download the NI-DAQmx instrument driver from ni.com/downloads. NI-DAQmx

supports programming an External Calibration in the LabVIEW, LabWindows™/CVI™, C/C++, C#, and

Visual Basic .NET. application development environments (ADEs). When you install NI-DAQmx, you

only need to install support for the ADE that you intend to use.

Documentation Requirements

For information about NI-DAQmx and NI cDAQ chassis, you can consult the following documents:

•DAQ Getting Started guides—These guides provide instructions for installing and configuring

NI-DAQ devices.

•NI DAQmx Help—This help file contains general information about measurement concepts, key

NI-DAQmx concepts, and common applications that apply to all programming environments.

•NI-DAQmx C Reference Help—This help file contains C reference and general information about

measurement concepts.

The documents above are installed with NI-DAQmx. You also can find the latest versions of the

documentation at ni.com/manuals.

•NI cDAQ-91xx User Guide and Specifications—This document includes detailed information

about your NI cDAQ chassis and provides the published specification values for NI cDAQ chassis.

Refer to the most recent User Guide and Specifications online at ni.com/manuals for

specifications.

ni.com/manuals

DeutschFrançais

NI cDAQ Chassis Calibration Procedure 2 ni.com

•NI cDAQ-9188 Ethernet Chassis Quick Start—This document explains how to install the

application and NI-DAQmx driver software, set up your NI cDAQ-9188 Ethernet chassis and

I/O modules, confirm the system is operating properly, and take your first measurement. You can

find this document at ni.com/manuals.

Calibration Interval

National Instruments recommends a calibration interval of one year for the NI cDAQ chassis. Adjust the

recommended calibration interval based on the measurement accuracy demands of your application.

Test Equipment

National Instruments recommends that you use the equipment in Table 1 for calibrating an NI cDAQ

chassis.

Test Conditions

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

published specifications.

• Keep connections to the C Series module as short as possible. Long cables and wires act as

antennae, picking up extra noise that can affect measurements.

• Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than the

ambient temperature.

• Keep relative humidity below 90%.

• Allow a warm up time of at least 10 minutes to ensure that the measurement circuitry is at a stable

operating temperature.

Calibration Procedures

The calibration process includes the following steps:

1. Initial Setup—Install the device and configure it in Measurement & Automation Explorer (MAX).

2. Verification—Verify the existing operation of the device. This step confirms whether the device is

operating within the published specifications prior to adjustment.

3. Adjustment—If the device does not fall within the desired specifications, return the device to NI for

repair. Refer to Where to Go for Support for assistance in returning the chassis to NI.

4. Reverification—Repeat the verification procedure to ensure that the device is operating within the

published specifications after adjustment.

The first two procedures are described in more detail in the following sections.

Table 1. Recommended Equipment

Equipment Recommended Model Minimum Requirements

Counter Agilent 53131A If this instrument is unavailable, use a

counter accurate to ±5 ppm.

C Series Digital I/O Module NI 9401 or NI 9402 —

C Series Connection Accessory NI 9934 (NI 9401) 25-pin DSUB connector kit.

©National Instruments Corporation 3 NI cDAQ Chassis Calibration Procedure

Initial Setup

Refer to the DAQ Getting Started guides for instructions on installing the software, hardware, and

configuring the NI cDAQ chassis. NI cDAQ-9188 users should refer to the NI cDAQ-9188 Ethernet

Chassis Quick Start.

Verification

This section provides instructions for verifying the counter on an NI cDAQ chassis.

1. Connect the counter to the C Series digital I/O module. Refer to Figure 1 for a connection diagram

of the NI 9401 and NI 9402.

a. Connect the positive input of the counter to DIO 0 on the C Series module.

b. Connect the negative input of the counter to COM or GND on the C Series module.

Figure 1. NI 9401 and NI 9402 Pin Assignments

2. Create and configure a counter output channel according to Table 2.

3. Start the generation of a square wave.

4. Configure the counter to measure frequency and use a 1 MΩ impedance.

5. Take a measurement of the square wave.

6. Compare the counter reading to the limits in Table 3.

Table 2. Counter Output Configuration

Frequency

Scaled

Units

Idle

State

Initial

Delay

DAQmx Timing

Instance

Generation

Mode

Samples to

Write

5000000 Seconds Low 0Implicit Continuous

Pulses

1000

Table 3. NI cDAQ Chassis Counter Limits

Set Point (MHz) Lower Limit (MHz) Upper Limit (MHz)

5 4.99975 5.00025

COM

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

25 DIO 3

GND

DIO 2

GND

DIO 0

NI 9402NI 9401

GND

DIO 1

GND

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 Patent Notice at

ni.com/patents.

7. Stop the generation.

8. Clear the generation.

9. Disconnect the counter from the C Series module.

The counter on the NI cDAQ chassis is now verified.

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, contact your local branch office:

Australia 1800 300 800, Austria 43 662 457990-0, Belgium 32 (0) 2 757 0020,

Brazil 55 11 3262 3599, Canada 800 433 3488, China 86 21 5050 9800,

Czech Republic 420 224 235 774, Denmark 45 45 76 26 00, Finland 358 (0) 9 725 72511,

France 01 57 66 24 24, Germany 49 89 7413130, India 91 80 41190000, Israel 972 3 6393737,

Italy 39 02 41309277, Japan 0120-527196, Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,

Malaysia 1800 887710, Mexico 01 800 010 0793, Netherlands 31 (0) 348 433 466,

New Zealand 0800 553 322, Norway 47 (0) 66 90 76 60, Poland 48 22 328 90 10,

Portugal 351 210 311 210, Russia 7 495 783 6851, Singapore 1800 226 5886,

Slovenia 386 3 425 42 00, South Africa 27 0 11 805 8197, Spain 34 91 640 0085,

Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151, Taiwan 886 02 2377 2222,

Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545

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