National Instruments NI 9203 Manuel

CALIBRATION PROCEDURE

NI 9203

This document contains the verification and adjustment procedures for the National

Instruments 9203. For more information about calibration solutions, visit ni.com/

calibration.

Contents

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

Documentation.......................................................................................................................... 2

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

Test Conditions......................................................................................................................... 3

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

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

Accuracy Verification....................................................................................................... 4

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

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

Offset Accuracy Adjustment ............................................................................................ 7

EEPROM Update ..................................................................................................................... 7

Re-Verification ......................................................................................................................... 7

Accuracy Under Calibration Conditions .................................................................................. 8

Worldwide Support and Services ............................................................................................. 8

Software

Calibrating the NI 9203 requires the installation of NI-DAQmx 9.2 or later on the calibration

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

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.

2|ni.com |NI 9203 Calibration Procedure

Documentation

Consult the following documents for information about the NI 9203, NI-DAQmx, and your

application software. All documents are available on ni.com and help files install with the

software.

Test Equipment

Table 1 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 in Table 1.

NI cDAQ-9174/9178 Quick Start

NI-DAQmx installation and hardware setup

NI 9203 Operating Instructions and Specifications

NI 9203 specific information, specifications, and calibration interval

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

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Calibrator Fluke 5700A If this instrument is unavailable, use a

high-precision current source with an

accuracy <100 ppm.

Chassis NI cDAQ-9178 —

NI 9203 Calibration Procedure |© National Instruments |3

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9203 meets

published specifications.

• Keep connections to the NI 9203 as short as possible. Long cables and wires act as

antennae, picking up extra noise that can affect measurements.

• Verify that all connections to the NI 9203 are secure.

• Use shielded copper wire for all cable connections to the NI 9203. Use twisted-pairs wire

to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C. The NI 9203 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 NI 9203 measurement

circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9203.

1. Install NI-DAQmx.

2. Make sure the NI cDAQ-9178 power source is not connected.

3. Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the

NI cDAQ-9178 chassis empty.

4. Connect the NI cDAQ-9178 chassis to your host computer.

5. Connect the power source to the NI cDAQ-9178 chassis.

6. Launch Measurement & Automation Explorer (MAX).

7. Right-click the device name and select Self-Test to ensure that the module is working

properly.

Verification

The following performance verification procedures describes the sequence of operation and test

points required to verify the NI 9203 and assumes that adequate traceable uncertainties are

available for the calibration references.

4|ni.com |NI 9203 Calibration Procedure

Accuracy Verification

Complete the following procedure to determine the As-Found status of the NI 9203.

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

2. Connect the NI 9203 to the calibrator. Refer to Figure 1 for a connection diagram.

Figure 1. Accuracy Connections for the NI 9203

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 to Operate mode (OPR).

4. Set the calibrator current to a Test Point value indicated in Table 4.

5. Acquire and average samples.

a. Create and configure an AI current channel according to Table 2.

b. Configure the AI current channel timing according to Table 3.

1 Connections when using a calibrator with a guard connection.

2 Connections when using a calibrator with no guard connection.

Table 2. NI 9203 AI Voltage Channel Configuration

Input

Range

Input Range Scaled

Units Terminal ConfigurationMin Max

Unipolar 0.000 0.020 Amps RSE

Bipolar -0.020 0.020 Amps RSE

Table 3. NI 9203 Timing Configuration

Samples Per Channel Acquisition Mode Rate (S/s)

10k Finite 20k

NI 9203Calibrator

COM

AIx

Guard

NI 9203Calibrator

COM

AIx

1 2

NI 9203 Calibration Procedure |© National Instruments |5

c. Start the task.

d. Read samples from the NI 9203.

e. Average the samples.

f. Clear the task.

6. Compare the average sample to the test limits in Table 4.

7. Repeat steps 4 through 6 for each Test Point in Table 4.

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

9. Disconnect the NI 9203 from the calibrator.

Adjustment

The following performance adjustment procedure describes the sequence of operation required

to adjust the NI 9203.

Gain Accuracy Adjustment

Complete the following procedure to adjust the gain accuracy performance of the NI 9203.

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

2. Connect the NI 9203 to the calibrator. Refer to Figure 1 for a connection diagram.

3. Adjust the NI 9203.

a. Initialize a calibration session on the NI 9203. The default password is NI.

b. Input the external temperature in degrees Celsius.

Table 4. NI 9203 Test Limits

Input

Range

Range (V) Test Point 1-Year Limits

Min Max Location Value (A)

Lower Limit

(A)

Upper Limit

(A)

Unipolar 0.000 0.020 Max 0.020000 0.019980 0.020020

0.000 0.020 Mid 0.010000 0.009988 0.010012

0.000 0.020 Min 0.000000 -0.000004 0.000004

Bipolar -0.020 0.020 Max 0.020000 0.019969 0.020031

-0.020 0.020 Mid 0.000000 -0.000014 0.000014

-0.020 0.020 Min -0.020000 -0.020031 -0.019969

6|ni.com |NI 9203 Calibration Procedure

c. Call and configure the NI 9203 get C Series adjustment points function according to

Table 5 to obtain an array of recommended calibration voltages for both the Unipolar

and Bipolar Input Range.

d. Set the calibrator to a reference value determined by the array of recommended

calibration currents.

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

f. Call and configure the NI 9203:Gain adjustment function according to Table 6 to

adjust the gain for both the Unipolar and Bipolar ranges.

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

h. Repeat steps d through g for each calibration voltage in the array.

i. Disconnect the calibrator from the NI 9203.

j. Close the calibration session.

4. Disconnect the NI 9203 from the calibrator.

5. Repeat steps 2 through 4 for each channel on the NI 9203.

Table 5. Get Adjustment Points Configuration

Input Range

Range

Min Max

Unipolar 0.000 0.020

Bipolar -0.020 0.020

Table 6. Gain Adjustment Configuration

Input

Range

Range Physical

Channel Reference ValueMin Max

Unipolar 0.000 0.020 cDAQMod8/aixThe reference value from the array

of adjustment points

Bipolar -0.020 0.020 cDAQMod8/aixThe reference value from the array

of adjustment points

NI 9203 Calibration Procedure |© National Instruments |7

Offset Accuracy Adjustment

Complete the following procedure to adjust the offset accuracy performance of the NI 9203.

1. On the NI 9203, connect AI3 to COM.

2. Adjust the NI 9203.

a. Initialize a calibration session on the NI 9203. The default password is NI.

b. Input the external temperature in degrees Celsius.

c. Call and configure the NI 9203:Offset adjustment function according to Table 7 to

adjust the offset for both the Unipolar and Bipolar ranges.

d. Close the calibration session.

3. Disconnect AI3 from COM on the NI 9203.

EEPROM Update

When an adjustment procedure is completed, the NI 9203 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.

Re-Verification

Repeat the Verification section to determine the As-Left status of the device.

Note If any test fails Re-Verification after performing an adjustment, verify that

you have met the Test Conditions before returning your device to NI. Refer to

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

Table 7. Offset Adjustment Configuration

Input Range

Range

Physical ChannelMin Max

Unipolar 0.000 0.020 cDAQMod8/aix

Bipolar -0.020 0.020 cDAQMod8/aix

8|ni.com |NI 9203 Calibration Procedure

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 9203 installed in slot 8 of an NI cDAQ-9178 chassis

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

Note For operational specifications, refer to the most recent NI 9203 Operating

Instructions/User Guide and Specifications 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.

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.

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

Table 8. NI 9203 Accuracy Under Calibration Conditions

Input Range

Percent of Reading

(Gain Error)

Percent of Range*

(Offset Error)

Unipolar 0.080% max 0.019%† max

Bipolar 0.082% max 0.033% max

* Range equals 21.5 mA for Unipolar and 43 mA (±21.5 mA) for Bipolar.

† This specification is lower than the Percent of Range typical specification in the NI 9203

Operating Instructions and Specifications because the typical specification shows digits only

to the hundredth place.

372674C-01 Jul15

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National Instruments trademarks. Other

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