National Instruments NI 9251 Handbuch

CALIBRATION PROCEDURE

NI 9251 with mini XLR

2 AI, 3 Vrms, 24 Bit, 102.4 kS/s/ch Simultaneous, AC/DC Coupling

This document contains the verification and adjustment procedures for NI 9251 with

mini XLR. For more information about calibration solutions, visit ni.com/calibration.

Contents

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

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

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

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 9251 with mini XLR requires the installation of NI-DAQmx 16.1 or later on

the calibration system.

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

LabWindows™/CVI™, ANSI C, and .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 9251 with mini XLR,

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 9251 with mini XLR Getting Started Guide

NI 9251 with mini XLR connection information

NI 9251 with mini XLR Datasheet

NI 9251 with mini XLR circuitry and specifications

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

Test Equipment

The following table 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.

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Calibrator

Fluke 5502A, Fluke 5522A,

Fluke 5530A

Use a high-precision voltage

source with gain error of

<100 ppm and offset error

<0.1 mV.

BNC (F) to Banana

Adapter

Pomona Electronics 1269 —

2| ni.com | NI 9251 Calibration Procedure

Table 1. Recommended Equipment (Continued)

Equipment Recommended Model Requirements

BNC (M) to BNC (M)

Coupler

Pomona Electronics 3533 Characteristic impedance :

50 Ω

BNC F-F-F-T-Connector Pomona Electronics 3284 Characteristic impedance :

50 Ω

mXLR to BNC (M) Cable

(quantity 2)

NI 140150A-XXX

• 0R46 for 0.46 m

• 0R91 for 0.91 m

• 2R4 for 2.4 m —

Chassis NI cDAQ-9178 —

Test Conditions

The following setup and environmental conditions are required to ensure the device 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 device measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9251 with mini XLR.

1. Install NI-DAQmx.

2. Make sure that the NI cDAQ-9178 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 using

the ground screw.

c) Attach the other end of the wire to the system safety ground.

NI 9251 Calibration Procedure | © National Instruments | 3

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 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 procedure describes the sequence of operation and

provides test points required to verify the NI 9251 with mini XLR. The verification procedure

assumes 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 9251 with

mini XLR.

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

2. Connect the NI 9251 with mini XLR to the calibrator as shown in the following figure.

Figure 1. Analog Input Verification Connections

NI 9251Calibrator

AI0–

AI0+

Chassis GND

AI1+

AI1–

Note The chassis ground lug connection to ground is the

NI 9251 with mini XLR ground connection.

3. Set the calibrator voltage to a Test Point value indicated in the NI 9251 with mini XLR

Verification Test Limits table.

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

5. Acquire and average samples for each channel.

a) Create and configure an AI voltage task according to the following

NI 9251 with mini XLR AI Voltage Task Configuration table.

Table 2. NI 9251 with mini XLR AI Voltage Task Configuration

Minimum (V) Maximum (V) Scaled Units Physical Channels Channel Configuration

-4.243 4.243 Volts AI0:1 DC Coupled

4| ni.com | NI 9251 Calibration Procedure

b) Configure the task timing according to the following NI 9251 with mini XLR Timing

Configuration table.

Table 3. NI 9251 with mini XLR Timing Configuration

Sample Mode Samples Per Channel Rate (kS/s)

Finite Samples 10240 102.4

c) Start the task.

d) Read the samples from the NI 9251 with mini XLR.

e) Average the samples for each AI channel.

f) Clear the task.

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

7. Compare the averaged samples to the limits in the NI 9251 with mini XLR Verification

Test Limits table to verify the input accuracy. If the value is within these limits, the device

passes the test.

8. Repeat steps 3 through 7 for each test point in the NI 9251 with mini XLR Verification

Test Limits table.

9. Disconnect the calibrator from the device.

Table 4. NI 9251 with mini XLR Verification Test Limits

Test Point 2-Year Limits

Location Value (V) Lower Limit (VDC) Upper Limit (VDC)

Minimum -1.9 -1.905161 -1.894839

Mid-scale 0 -0.002885 0.002885

Maximum 1.9 1.894839 1.905161

Note The test limits listed in the NI 9251 with mini XLR Verification Test Limits

table are derived using values from the NI 9251 with mini XLR Accuracy Under

Calibration Conditions table.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9251 with mini XLR.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the

NI 9251 with mini XLR.

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

2. Connect the NI 9251 with mini XLR to the calibrator as shown in the Accuracy

Verification section.

NI 9251 Calibration Procedure | © National Instruments | 5

3. Adjust the NI 9251 with mini XLR.

a) Initialize a calibration session on the NI 9251 with mini XLR. The default password

is NI.

b) Input the external temperature in degrees Celsius.

c) Call the NI 9251 with mini XLR get C Series adjustment points function to obtain an

array of recommended calibration voltages for the NI 9251 with mini XLR.

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 9251 with mini XLR adjustment function according to

NI 9251 with mini XLR Adjustment Configuration table.

Table 5. NI 9251 with mini XLR Adjustment Configuration

Physical Channel Reference Value

cDAQ1Mod8/AI0:1 The actual value of the voltage output of the calibrator

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

h) Repeat steps d through g for each point in the array.

i) Close the calibration session.

4. Disconnect the NI 9251 with mini XLR from the calibrator.

EEPROM Update

When an adjustment procedure is completed, the NI 9251 with mini XLR 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.

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 the

Worldwide Support and Services section for assistance in returning the device to NI.

Accuracy under Calibration Conditions

The values in the following table are based on calibrated scaling coefficients, which are stored

in the onboard EEPROM.

6| ni.com | NI 9251 Calibration Procedure

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

• Ambient temperature 23 °C ± 5 °C

• NI 9251 with mini XLR installed in slot 8 of an NI cDAQ-9178 chassis

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

Table 6. NI 9251 with mini XLR Accuracy under Calibration Conditions

Device Percent of Reading (Gain Error) Percent of Range1

NI 9251 with mini XLR ±0.1198% ±0.0680%

Note For operational specifications, refer to the most recent

NI 9251 with mini XLR Datasheet online at ni.com/manuals.

Worldwide Support and Services

The NI 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 NI product. Product registration facilitates technical

support and ensures that you receive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliance with the Council of the

European 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.

NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas,

78759-3504. NI 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.

1Range equals 4.243 V.

NI 9251 Calibration Procedure | © National Instruments | 7

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.

376360A-01 April 10, 2017

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