National Instruments PXIe-4357 Manuale

CALIBRATION PROCEDURE

NI PXIe-4357

This document contains information about calibrating National Instruments PXIe-4357

SC Express modules using NI-DAQmx. For more information about calibration, visit ni.com/

calibration.

Contents

Software Requirements............................................................................................................. 1

Documentation Requirements .................................................................................................. 2

Calibration Interval................................................................................................................... 2

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

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

Calibration Procedure ............................................................................................................... 3

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

Connecting the Calibrator to the Module ................................................................. 4

Verification ....................................................................................................................... 5

4-Wire Accuracy Verification .................................................................................. 5

Adjustment Procedure ...................................................................................................... 7

Specifications............................................................................................................................ 9

Where to Go for Support .......................................................................................................... 10

Software Requirements

Install NI-DAQmx 9.5 or later on the calibration computer. NI-DAQmx includes high-level

function calls to simplify the task of writing software to calibrate modules. You must have the

proper module driver installed on the calibration system before calibrating the module.

Note NI recommends that you install the NI-DAQmx driver software before

physically installing the NI PXIe-4357. NI-DAQmx, available at ni.com/

downloads, configures and controls the NI PXIe-4357.

NI-DAQmx supports a number of programming languages, including LabVIEW,

LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET.

ni.com/manuals

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Documentation Requirements

The following documents are your primary references for writing your calibration utility with

NI-DAQmx. You can download the latest version of these documents from the NI Web site at

ni.com/manuals.

• The NI PXIe-4357 and TB-4357 Installation Guide and Terminal Block Specifications

provides instructions for installing and configuring the NI PXIe-4357 module and TB-4357

accessory. This document also contains TB-4357 specifications.

• The NI PXIe-4357 User Manual describes how to use the NI PXIe-4357.

• The NI PXIe-4357 Specifications lists the specifications for the NI PXIe-4357.

• The NI-DAQmx Help includes information about creating applications that use the

NI-DAQmx driver.

• The NI-DAQmx C Reference Help includes information about the functions in the driver.

Calibration Interval

National Instruments recommends a calibration interval of one year for the NI PXIe-4357. You

should adjust the recommended calibration interval based on the measurement accuracy

demands of your application.

Test Equipment

National Instruments recommends that you use the equipment in Table 1 for calibrating an

NI PXIe-4357 module.

Table 1. Recommended Equipment

Equipment Recommended Model(s) Requirements

Calibrator Fluke 5520A If this instrument is unavailable,

use a calibrator that can provide

resistance values in the range of

0Ωto 400 Ωwith 0.01 Ω

resolution, an accuracy of 90 ppm

or better, and automatic lead-wire

compensation.

PXI Express chassis NI PXIe-1062Q —

Connection accessory TB-4357 terminal block Screw terminal accessory for the

NI PXIe-4357.

Test Conditions

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

published specifications:

• Keep connections to the module as short as possible. Long cables and wires act as antennae,

picking up extra noise that can affect measurements.

• Use shielded copper wire for all cable connections to the module. Use twisted-pair 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 15 minutes to ensure that the measurement circuitry of the

module is at a stable operating temperature.

• Ensure that the PXI Express chassis fan speed is set to HIGH, that the fan filters are clean,

and that the empty slots contain filler panels. For more information, refer to the Maintain

Forced-Air Cooling Note to Users document available at ni.com/manuals.

Calibration Procedure

This section provides instructions for verifying the performance of the NI PXIe-4357.

The calibration process consists of the following steps:

1. Initial Setup—Install the module and configure it in Measurement & Automation Explorer

(MAX).

2. Verification—Verify the existing operation of the module. This step confirms whether the

module is operating within the published specifications prior to adjustment.

3. Adjustment Procedure—If necessary, perform an external calibration that adjusts the

module calibration constants with respect to a known calibration source.

4. Reverification—Repeat the verification procedure to ensure that the module is operating

within the published specifications after adjustment.

Initial Setup

You must configure the module in Measurement & Automation Explorer (MAX) to

communicate with NI-DAQmx.

Complete the following steps to configure a module in MAX. Refer to the NI PXIe-4357 and

TB-4357 Installation Guide and Terminal Block Specifications for complete installation

instructions.

1. Install the NI-DAQmx driver software.

Caution Always have the PXI Express chassis turned off when inserting a module.

2. Insert the module into an available slot in the PXI Express chassis.

3. Install the terminal block.

4. Power on the chassis.

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5. Launch MAX.

6. Expand Devices and Interfaces to confirm that MAX detects the module.

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

properly.

Note When a module is configured with MAX, it is assigned a module name. Each

function call uses this module name to determine which DAQ module to calibrate.

This document uses Dev1 to refer to the module name. In the following procedures,

use the module name as it appears in MAX.

Connecting the Calibrator to the Module

Refer to the specific verification or calibration procedure section for information describing the

required module connections. Each channel consists of a group of four pins specific to that

channel. Before connecting or disconnecting the calibrator from the module, always set the

calibrator to standby mode (STBY).

Refer to Figure 1 for the pin assignments of the TB-4357.

Figure 1. TB-4357 Pin Assignments

EX–

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

EX–

EX+

AI–

AI+

C H 0 C H 5 C H 10 C H 15

C H 1 C H 6 C H 11 C H 16

C H 2 C H 7 C H 12 C H 17

C H 3C H 8 C H 13C H 18

C H 4 C H 9 C H 14 C H 19

J2 J7

J8J3

J9J4

J10J5

J11J6

TB–4357 152646A–01L S/N

FOR PATENTS: NI.COM/PATENTS

Refer to Table 2 for the analog signal names of the TB-4357.

Verification

Verification determines how well the module is meeting its specifications. By completing this

procedure, you can see how the module has drifted over time, which helps you determine the

appropriate calibration interval for your application. The NI PXIe-4357 has 20 independent

analog input channels. You can conduct verification on any or all of them, depending upon your

desired test coverage.

4-Wire Accuracy Verification

Complete the following steps to test the 4-wire accuracy of the module.

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

2. Make the following connections to the TB-4357 for the channel you want to verify. Refer

to Figure 2 for visual reference. Refer to the Connecting the Calibrator to the Module

section for the pin assignments and signal names of the TB-4357.

Figure 2. 4-Wire Accuracy Verification Connections

3. Zero the calibrator with the ohms-only zero (OHMS ZERO) operation. Refer to the

calibrator documentation for more information about zeroing the calibrator.

4. Set the calibrator output for 4-wire compensation (COMP 4-wire).

5. Set the calibrator resistance output to a 0 Ω.

6. Set the calibrator to operate mode (OPR).

7. Create a task.

Table 2. TB-4357 Analog Signal Names

Signal Names Signal Descriptions

EX– Excitation current return

EX+ Positive excitation current output

AI– Negative analog input

AI+ Positive analog input

Calibrator

AUX HI

AUX LO

TB-4357

CH X

EX+

AI+

AI–

EX–

6|ni.com

8. Create and configure an AI Resistance channel according to the values in Table 3.

9. Configure the timing properties for the task.

10. Start the task.

11. Acquire 10 points of data.

12. Average the readings that you acquired and record the result.

13. Clear the task.

14. Repeat steps 5 through 13 for all calibrator output values listed in Table 4. NI recommends

that you verify all values, although you can save time by verifying only the values used in

your application.

15. Compare the measured result for each value to the Upper Limit (

)and Lower Limit (

)

values in Table 4. If the results are all between these values, the module passes the test.

16. Set the calibrator to standby mode (STBY).

17. Disconnect the calibrator from the module.

18. Repeat steps 2 through 17 for every channel you want to verify.

Table 3. 4-Wire Configuration Values

Configuration Value

Channel Name Dev1/aix, where xrefers to the channel number

Min Input Limit 0

Max Input Limit 400

Units Ohms

Resistance Configuration 4-wire

Current Excitation Source Internal

Current Excitation Value 0.0009

Sample Clock Rate (Hz) 10

Sample Mode Finite Samples

Samples to Read 10

Adjustment Procedure

Use the adjustment procedure to adjust the gain and offset calibration constants for each channel.

At the end of each calibration procedure, these new constants are stored in the external

calibration area of the EEPROM. These values are password-protected, which prevents the

accidental access or modification of any calibration constants adjusted by the metrology

laboratory. The default password is NI. You can calibrate as many or as few channel and

excitation configurations as desired. The calibration routine for the NI PXIe-4357 uses a

two-point calibration to determine the gain and offset adjustment calibration constants.

Complete the following steps to test the accuracy of the module.

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

2. Make the following connections to the TB-4357 for the channel you want to adjust. Refer

to Figure 3 for visual reference. Refer to the Connecting the Calibrator to the Module

section for the pin assignments and signal names of the TB-4357.

Note All connections shown in Figure 3 must be made using discrete connections.

Figure 3. Adjustment Connections

Table 4. 4-Wire Mode Accuracy Test Limits

Test Point (Ω)Lower Limit (Ω)Upper Limit (Ω)

0–0.034 0.034

50 49.946 50.054

100 99.926 100.074

150 149.906 150.094

200 199.886 200.114

250 249.866 250.134

300 299.846 300.154

350 349.826 350.174

400 399.806 400.194

Calibrator

AUX HI

AUX LO

TB-4357

CH X

EX+

AI+

AI–

EX–

8|ni.com

3. Zero the calibrator with the ohms-only zero (OHMS ZERO) operation. Refer to the

calibrator documentation for more information about zeroing the calibrator. This step can

be skipped if an OHMS ZERO has already been executed on the calibrator as required by

the calibrator for the specified accuracy.

4. Set the calibrator output for 4-wire compensation (COMP 4-wire).

5. Set the calibrator resistance output to 100 Ω. This is the first calibration point.

6. Set the calibrator to operate mode (OPR).

7. Open a calibration session on your module using the DAQmx Initialize External

Calibration VI. The default password is NI.

8. Call the DAQmx Adjust 4357 Calibration VI.

9. Set the calibrator to output a resistance of 350 Ω. This is the second calibration point.

10. Call the DAQmx Adjust 4357 Calibration VI.

LabVIEW Block Diagram NI-DAQmx Function Call

Call DAQmxInitExtCal with the following

parameters:

deviceName: Dev1

password: NI

calHandle: &calHandle

LabVIEW Block Diagram NI-DAQmx Function Call

Call DAQmxAdjust4357Cal with the

following parameters:

calHandle: calHandle

physicalChannel: Dev1/ai

, where

refers to

the channel number.

refValues: [100]

numRefValues: 1

LabVIEW Block Diagram NI-DAQmx Function Call

Call DAQmxAdjust4357Cal with the

following parameters:

calHandle: calHandle

physicalChannel: Dev1/ai

, where

refers to

the channel number.

refValues: [350]

numRefValues: 1

11. Save the adjustment to the EEPROM, using the DAQmx Close External Calibration VI.

This VI also saves the date, time, and temperature of the adjustment to the onboard memory.

Note If an error occurs during adjustment, no constants will be written to the

EEPROM.

12. Repeat steps 1 through 11 for each channel to be adjusted.

13. Set the calibrator to standby mode (STBY).

14. Disconnect the calibrator from the module.

The module is now calibrated with respect to your external source. After calibrating the module,

you must reverify the accuracy of the module. To do this, repeat the Verification section.

Specifications

The specifications in Table 5 are provided for reference only, refer to the NI PXIe-4357

Specifications and NI PXIe-4357 User Manual for detailed specification and application

information. The values in Table 5 are based on calibrated scaling coefficients, which are stored

in the onboard EEPROM. The following calibration specifications are for 23 °C ±5 °C.

LabVIEW Block Diagram NI-DAQmx Function Call

Call DAQmxCloseExtCal with the following

parameters:

calHandle: calHandle

action: DAQmx_Val_Action_Commit

Table 5. NI PXIe-4357 Measurement Accuracy, 1 Year, 23 °C ±5 °C Max, 4-Wire Mode

Offset Error (Ω)Gain Error (% of Reading)

0.034 0.04

373441A-01 Mar12

CVI, LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are trademarks of National

Instruments Corporation. Refer to the Trademark Information at ni.com/trademarks for other National Instruments trademarks. The mark

LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States

and other countries. 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 Patents Notice at ni.com/patents. 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.

Where to Go for Support

The National Instruments Web site 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 Web sites, which provide up-to-date contact information,

support phone numbers, email addresses, and current events.

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