National Instruments NI-9361 Manuel

NI-9361

CALIBRATION PROCEDURE

NI 9361

8-Channel Counter Input Module

This document contains the verification procedure for the NI 9361. For more information

about calibration solutions, visit ni.com/calibration.

Contents

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

Documentation.......................................................................................................................... 1

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

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

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

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

Accuracy Under Calibration Conditions...................................................................................5

Worldwide Support and Services.............................................................................................. 5

Software

Calibrating the NI 9361 requires the installation of NI-DAQmx 14.5 or later on the calibration

system. You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports

LabVIEW, LabWindows™/CVI™, ANSI C, and Microsoft 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 the NI 9361, 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 9361 Getting Started Guide

NI 9361 specific information

NI 9361 Datasheet

NI 9361 specifications and calibration interval

NI-DAQmx Readme

Operating system and application software support in NI-DAQmx

NI DAQmx Help

Information about creating applications that use the NI-DAQmx driver

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

Test Equipment

The following table lists the equipment recommended for the performance verification

procedure. If the recommended equipment is not available, select a substitute using the

requirements listed.

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Frequency Standard NI PXIe-6674T,

NI PXIe-6614, or

Keysight 33250A

A highly stable clock source that is

able to generate 1 MHz, 5 V TTL

output with ≤±5 ppm total accuracy

Chassis NI cDAQ-9178 —

Connection

Accessory

NI 9923 —

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9361 meets

published specifications.

2| ni.com | NI 9361 Calibration Procedure

• Keep connections to the NI 9361 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 9361 are secure.

• Maintain an ambient temperature of 23 °C ± 5 °C. The NI 9361 temperature will be

greater than the ambient temperature.

• Keep relative humidity below 80%.

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).

Note When a device is configured in MAX, it is assigned a device name. Each

function call uses this device name to determine which device to calibrate. This

document uses Dev_name to refer to the device name. In the following procedures,

use the device name as it appears in MAX.

Complete the following steps to set up the NI 9361.

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) Connect the ring lug to the ground terminal on the side of the NI cDAQ-9178 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.

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.

Verification

The following performance verification procedure describes the sequence of operation and

provides test points required to verify the NI 9361. The verification procedure assumes that

adequate traceable uncertainties are available for the calibration references.

Base Clock Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9361.

1. Connect the Frequency Standard to the NI 9361 as shown in the following figure. Use the

NI 9923 to make the connections.

NI 9361 Calibration Procedure | © National Instruments | 3

Figure 1. Base Clock Accuracy Verification Connections

OUT

GND

NI 9361

DI-

Frequency

Standard DI+

COM

2. Acquire a Base Clock Accuracy sample.

a) Configure the NI 9361 in single-ended mode with the settings in Table 2.

b) Configure the Frequency Standard with the settings in Table 3.

c) Start task.

d) Wait at least 20 ms after starting the acquisition before reading the data in order to

provide time for the measurement to become valid.

e) Read the measurement value for the Base Clock Accuracy.

f) Compare the Base Clock Accuracy measurement to the test limits in Table 4.

Table 2. NI 9361 Configuration

Test

Points

NI 9361 Settings

Counter

Channel

Measurement

Type

Measurement

Method

Measurement

Time

Divisor Maximum

Measurable

Period

1 MHz ctr0 Frequency Dynamic

Averaging

0 10,000 0

Note To configure Measurement Time, Divisor, and Maximum Measurable

Period, you must explicitly set these properties with the DAQmx Channel

Property Node after calling DAQmx Create Channel.

Table 3. Frequency Standard Settings

Frequency Format Duty Cycle

1 MHz TTL 50%

Table 4. NI 9361 Base Clock Accuracy Verification Test Limits

Test Point Lower Limit Upper Limit

1,000,000 Hz 999,950 Hz 1,000,050 Hz

If the Base Clock Accuracy verification procedure determines that the NI 9361 is outside

of the limits, refer to Worldwide Support and Services for assistance in returning the

device to NI.

4| ni.com | NI 9361 Calibration Procedure

Accuracy Under Calibration Conditions

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

• Ambient temperature of 23 °C ± 5 °C

• NI 9361 installed in slot 8 of an NI cDAQ-9178 chassis

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

Table 5. NI 9361 Base Clock Accuracy

Test Point Specification Limit

1 MHz 50 ppm

Note For operational specifications, refer to the most recent NI 9361 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

other services.

Visit ni.com/register to register your National Instruments product. Product registration

facilitates technical support and ensures that you receive important information updates from

NI.

National Instruments corporate headquarters is located at 11500 North Mopac Expressway,

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 1 866 ASK MYNI (275 6964). 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.

NI 9361 Calibration Procedure | © National Instruments | 5

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for 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 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 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.

375074A-01฀Mar15

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