National Instruments 9252 Manual

CALIBRATION PROCEDURE

NI 9252

8 AI, ±10 V, 24 bit, 50 kS/s/ch Simultaneous

This document contains the verification and adjustment procedures for NI 9252. 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................................................................................................................................3

Accuracy Verification....................................................................................................... 3

Adjustment................................................................................................................................ 5

Accuracy Adjustment........................................................................................................5

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

Reverification............................................................................................................................6

Accuracy under Calibration Conditions....................................................................................6

Revision History....................................................................................................................... 7

Worldwide Support and Services.............................................................................................. 7

Software

Calibrating the NI 9252 requires the installation of NI-DAQmx 19.1 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 9252, 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 9252 Getting Started Guide

NI 9252 connection information

NI 9252 Datasheet

NI 9252 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 Use a high-precision DC voltage source

with a gain uncertainty of <57 ppm and an

offset uncertainty of <0.6 mV.

Chassis NI cDAQ-9178 —

DSUB Connection

Accessory1

NI 9923 —

1For NI 9252 with DSUB variant

2| ni.com | NI 9252 Calibration Procedure

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.

• 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 9252.

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.

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 9252. 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 9252.

NI 9252 Calibration Procedure | © National Instruments Corporation | 3

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

2. Connect the NI 9252 to the calibrator as shown in the following figure.

Figure 1. Analog Input Verification Connections

NI 9252Calibrator

AIx–

AIx+

COM

Guard

NI 9252Calibrator

AIx–

AIx+

COM

1. Connections when using a calibrator with a guard connection.

2. Connections when using a calibrator with no guard connection.

Note If the calibrator outputs are truly floating, connect the negative output to

a quiet earth ground as well as COM to give the entire system a ground

reference.

3. Set the calibrator voltage to a Test Point value indicated in the NI 9252 Verification Test

Limits table.

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

5. Acquire and average samples.

a) Create and configure an AI voltage channel according to the following NI 9252 AI

Voltage Task table.

Table 2. NI 9252 AI Voltage Task

Physical Channels Range Terminal Configuration

cDAQMod8/AI0:7 ±10.5 V Differential

b) Configure the AI voltage channel timing according to the following NI 9252 Task

Timing table.

Table 3. NI 9252 Task Timing

Samples Per Channel Acquisition Mode Rate (kS/s)

1000 Finite Samples 50

c) Set the filter frequency to 3125 Hz using the Channel Property ( Analog Input »

General Properties »Filter »Frequency ).

d) Start the task.

e) Read the samples from the NI 9252.

f) Average the samples.

g) Clear the task.

6. Compare the averaged samples to the limits in the NI 9252 Verification Test Limits table

to verify the input accuracy. If the values are within these limits, the device passes the

test.

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

4| ni.com | NI 9252 Calibration Procedure

8. Repeat steps 3 through 7 for each test point in the NI 9252 Verification Test Limits table.

9. Disconnect the calibrator from the device.

Table 4. NI 9252 Verification Test Limits

Test Points 2-Year Limits

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

Min -10.0000 -10.0166 -9.9834

Mid 0.0000 -0.0026 0.0026

Max 10.0000 9.9834 10.0166

Note The test limits listed in the NI 9252 Verification Test Limits table are derived

using values from the NI 9252 Accuracy Under Calibration Conditions table.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9252.

Accuracy Adjustment

Complete the following procedure to adjust the accuracy performance of the NI 9252.

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

2. Connect the NI 9252 to the calibrator as shown in the Accuracy Verification section.

3. Adjust the NI 9252.

a) Initialize a calibration session on the NI 9252. The default password is NI.

b) Input the external temperature in degrees Celsius.

c) Call the NI 9252 get C Series adjustment points function to obtain an array of

recommended calibration voltages for the NI 9252.

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 9252 adjustment function according to NI 9252

Adjustment Configuration table.

Table 5. NI 9252 Adjustment Configuration

Physical Channel Reference Value

cDAQ1Mod8/AI0:7 The actual value of the voltage output of the calibrator

Note The module acquisition is started each time the adjust function is

called. There is a delay of approximately 550 µs from the acquisition start

until module data becomes available.

NI 9252 Calibration Procedure | © National Instruments Corporation | 5

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.

j) Clear the task.

4. Disconnect the NI 9252 from the calibrator.

EEPROM Update

When an adjustment procedure is completed, the NI 9252 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.

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

• Ambient temperature 23 °C ± 5 °C

• NI 9252 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 9252 Accuracy under Calibration Conditions

Device Percent of Reading (Gain Error) Percentage of Range (Offset Error)2

NI 9252 0.14% 0.025%

Note For operational specifications, refer to the most recent NI 9252 Datasheet

online at ni.com/manuals.

2Range equals 10.5 V.

6| ni.com | NI 9252 Calibration Procedure

Revision History

Part Number Edition Date Section Changes

378062B-01 August 2020 Accuracy

Verification

Added callout notes to the analog input

verification connections figure

Updated Channel Property setting

sequence in step 5.c)

Updated the verification test limits table

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 information about the services NI offers.

Visit ni.com/register to register your NI product. Product registration facilitates technical

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

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

78759-3504. NI also has offices located around the world. For support in the United States,

create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For

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.

NI 9252 Calibration Procedure | © National Instruments Corporation | 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.

378062B-01 September 2, 2020

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