National Instruments Eight-slot USB Chassis NI cDAQ-9172 Handbuch

CALIBRATION PROCEDURE

cDAQ Chassis and Controllers

This document contains information for calibrating NI CompactDAQ (cDAQ-913x/917x/

918x/919x) chassis and controllers. For more information about calibration, visit ni.com/

calibration.

Software Requirements

Calibrating cDAQ chassis and controllers requires the installation of NI-DAQmx on the

calibration system. NI recommends using the latest NI-DAQmx driver. Refer to the

NI-DAQmx Readme to ensure support for the chassis or controller you want to calibrate, as

well as for the C Series digital module you are using. You can download NI-DAQmx from

ni.com/downloads. NI-DAQmx supports many programming languages, including 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.

Documentation

Consult the following documents for information about cDAQ chassis and controllers,

C Series modules, and the NI-DAQmx driver. All documents are available on ni.com/manuals;

help files install with the software.

Quick start for your cDAQ chassis or controller

The quick start provides instructions for installing and configuring your cDAQ

chassis or controller and C Series module.1

User manual for your cDAQ chassis or controller

The user manual provides information about your cDAQ chassis or controller.2

1The NI cDAQ-9172 User Guide and Specifications provides instructions for installing and

configuring your cDAQ-9172 and C Series module.

2The NI cDAQ-9172 User Guide and Specifications provides information about the cDAQ-9172

chassis.

Specifications for your cDAQ chassis or controller

The specifications provides detailed specifications for your cDAQ chassis or

controller.3

Getting started guide for your C Series module

The getting started guide for your C Series module provides information about

wiring to your C Series digital module.

NI-DAQmx Readme

Provides operating system and application software support in NI-DAQmx.

NI-DAQmx Help

Provides information about creating applications that use the NI-DAQmx driver.

NI-DAQmx C Reference Help

Provides reference information for NI-DAQmx C functions and NI-DAQmx

C properties.

Calibration Interval

NI recommends a calibration interval of one year for cDAQ chassis and controllers. Adjust the

recommended calibration interval based on the measurement accuracy demands of your

application.

Test Equipment

The following table lists the equipment required for calibrating your chassis or controller. If

you do not have the recommended instruments, use the minimum requirements to select

substitute equipment.

Table 1. Recommended Test Equipment

Equipment Recommended Models Minimum Requirements

Counter Keysight 53131A/53220A Counter accuracy to ±5 ppm

C Series Digital Module NI 9401 or NI 9402 —

3The NI cDAQ-9172 User Guide and Specifications provides detailed specifications for the

cDAQ-9172 chassis.

2| ni.com | cDAQ Chassis and Controllers Calibration Procedure

Table 1. Recommended Test Equipment (Continued)

Equipment Recommended Models Minimum Requirements

(NI 9401) Front-Mounted

Terminal Block

NI 9924 or NI 9934 Terminal block for 25-pin DSUB

modules

(NI 9401) BNC-to-Leads

Cable

— BNC male-to-leads cable with a

length suitable for the application

(NI 9402) BNC Cable NI part number 781887-01 BNC male-to-BNC male cable with

a length suitable for the application

Test Conditions

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

controller meets published specifications:

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

wires act as antennas, picking up extra noise that can affect measurements.

• Maintain an ambient temperature of 23 °C ± 5 °C. The cDAQ chassis/controller

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 cDAQ chassis/controller is

at a stable operating temperature.

• Consult the user documentation for the counter for the recommended warm up time (at

least 45 minutes) to ensure that the counter circuitry is at a stable operating temperature.

Calibration Procedure

The calibration process includes the following steps:

1. Initial Setup—Set up the chassis or controller, install the module, and configure them in

Measurement & Automation Explorer (NI MAX).

2. Counter Verification—Verify the existing operation of the chassis or controller. This step

confirms whether the cDAQ chassis or controller is operating within the published

specifications.

Initial Setup

Refer to the quick start for your cDAQ chassis or controller for instructions on installing the

application and NI-DAQmx driver software, setting up your chassis or controller, installing

your C Series digital module, and confirming the system is operating properly.4 If you are

4For the cDAQ-9172, refer to the NI cDAQ-9172 User Guide and Specifications for installation

information.

cDAQ Chassis and Controllers Calibration Procedure | © National Instruments | 3

using the NI 9401 for verification, refer to the NI 9924 User Guide and Specifications for

installation information.

Note (cDAQ-9172) You must install the C Series digital module in slot 5 or 6 of

the chassis.

Counter Verification

CompactDAQ chassis and controllers have only one timebase to verify, so only Counter 0

needs to be checked. It is not possible to adjust this timebase, so only verification can be

performed. Complete the following steps to verify the counter on the cDAQ chassis or

controller.

1. Connect the external counter to the C Series digital module.

•(NI 9401) Connect the positive input of CHANNEL 1 to DIO 3 (pin 19) and the

negative input to COM (pin 1) using a BNC-to-leads cable, as shown in the

following figure.

Figure 1. NI 9401 and NI 9924 Signal Connections to the External Counter

CHANNEL 1 CHANNEL 2

CHANNEL 3

COM

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

•(NI 9402) Connect CHANNEL 1 to the DIO 0 BNC with a standard BNC cable, as

shown in the following figure.

4| ni.com | cDAQ Chassis and Controllers Calibration Procedure

Figure 2. NI 9402 Signal Connections to the External Counter

DIO 3

GND

DIO 2

GND

DIO 0

GND

DIO 1

GND

CHANNEL 1 CHANNEL 2

CHANNEL 3

2. Call DAQmxCreateTask to configure Counter 0 with the following parameters:

•Frequency = 5000000

•Scaled Units = Seconds

•Idle State = Low

•Initial Delay = 0

•DAQmx Timing Instance = Implicit

•Generation Mode = Continuous Pulses

•Samples to Write = 1000

3. Call DAQmxStartTask to start the generation of a square wave

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

5. Take a measurement of the square wave using the external counter.

6. Compare the counter reading to the limits in the following table.

Table 2. cDAQ Counter Limits

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

5 4.99975 5.00025

7. Call DAQmxStopTask to stop the generation.

8. Call DAQmxClearTask to clear the generation.

9. Disconnect the external counter from the C Series module.

The counter on the cDAQ chassis/controller is now verified.

If the cDAQ chassis or controller does not fall within the desired specifications, return it to NI

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

to NI.

cDAQ Chassis and Controllers Calibration Procedure | © National Instruments | 5

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.

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 websites, which provide up-to-date contact information,

support phone numbers, email addresses, and current events.

Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for

information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their

respective companies. For patents covering NI 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. 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 NI 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.

373718B-01 May 4, 2017

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