National Instruments PXIe-4339 Handbuch

CALIBRATION PROCEDURE

NI PXIe-4339

8 Ch, 24-bit, 25.6 kS/s Universal Bridge Input Module

This document contains the verification and adjustment procedures for the National Instruments

PXIe-4339 module. For more information about calibration solutions, visit ni.com/

calibration.

Contents

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

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

Test Equipment......................................................................................................................... 3

Connecting the TB-4339/B/C........................................................................................... 3

Test Conditions......................................................................................................................... 5

Initial Setup............................................................................................................................... 5

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

Voltage Mode Accuracy Verification............................................................................... 6

Ratio Mode Accuracy Verification................................................................................... 7

Adjustment................................................................................................................................ 21

Adjustment Procedure ...................................................................................................... 21

EEPROM Update ..................................................................................................................... 28

Reverification ........................................................................................................................... 29

Specifications............................................................................................................................ 29

Where to Go for Support .......................................................................................................... 29

Software

Calibrating the NI PXIe-4339 requires the installation of NI-DAQmx on the calibration system.

Driver support for calibrating the NI PXIe-4339 was first available in NI-DAQmx 14.5.1. For

the list of devices supported by a specific release, refer to the NI-DAQmx Readme, available on

the version-specific download page or installation media.

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.

ni.com/manuals

DeutschFrançais

2|ni.com |NI PXIe-4339 Calibration Procedure

Documentation

Consult the following documents for information about the NI PXIe-4339, NI-DAQmx, and

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

the software.

NI PXIe-4339 and TB-4339/B/C Installation Guide and Terminal Block Specifications

NI-DAQmx driver software installation and hardware setup

NI PXIe-4339 User Manual

NI PXIe-4339 usage and reference information

NI PXIe-4339 Specifications

NI PXIe-4339 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

NI PXIe-4339 Calibration Procedure |© National Instruments |3

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.

Table 1. Recommended Equipment

Equipment Recommended Model Requirements

Calibrator Fluke 5700 If this instrument is unavailable, use a

calibrator that can provide DC voltage

values in the range of 0 to ±10 V with an

accuracy of 50 ppm of output or better

and a DC offset error of 4 µV or better.

PXI Express

Chassis

NI PXIe-1062Q —

Connection

Accessory

TB-4339/B/C —

4|ni.com |NI PXIe-4339 Calibration Procedure

Connecting the TB-4339/B/C

The TB-4339/B/C provides connections for the NI PXIe-4339. Figure 1 shows the pin

assignments of the TB-4339/B/C.

Caution Always have the NI PXI Express chassis powered off when inserting a

module into the chassis.

Figure 1. TB-4339/B/C Pin Assignments

Each channel consists of two terminal connections specific to that channel as shown in Table 2.

Parallel connections to the input channels are used for verification and adjustment.

Refer to Table 2 for the analog signal names of the TB-4339/B/C.

Table 2. TB-4339/B/C Analog Signal Names

Signal Name Signal Description

AI+ Positive input voltage terminal

AI-Negative input voltage terminal

CH2 CH3

CH0 CH1

CH5CH4

CH6 CH7

PFI0

DGND

AOGND

AIGND

T–

T+

T–

T+

T–

T+

T–

T+

T–

T+

T–

T+

T–

T+

SCA

SCA SCA

SCA

RS+

EX+

AI+

AO+

RS–

EX–

AI–

RS+

EX+

AI+

AO+

RS–

EX–

AI–

AI+

AI–

EX–

AI+

AI–

EX–

AO+

RS–

EX+

AO+

RS–

EX+

RS+

AI+

AI–

EX–

AI+

AI–

EX–

AO+

RS–

EX+

AO+

RS–

EX+

RS+

RS+RS+

RS+

EX+

AI+

AO+

RS–

EX–

AI–

RS+

EX+

AI+

AO+

RS–

EX–

AI–

QTR

S/NS/N

155411A-01L155411A-01L

NI TB-4339NI TB-4339

J15

CR2

R22

R10

R21

J11

J10

R18

R11R15

J18

J16

R23

R16

J12

J19

R24

J17

R25

R12

R26

R13

CR1

J13

J14

R19

R14

R20

FOR PATENTS: NI.COM/PATENTS

N114N114

NI PXIe-4339 Calibration Procedure |© National Instruments |5

Complete the following steps to connect the TB-4339/B/C.

1. Install the NI PXIe-4339 and the TB-4339/B/C modules in the NI PXI Express chassis

according to the instructions in the NI PXIe-4339 and TB-4339/B/C Installation Guide and

Terminal Block Specifications.

2. For voltage verification and adjustment, connect the calibrator to the TB-4339/B/C as

shown in Figure 2.

• If the calibrator has a guard connection, leave it disconnected.

• If the calibrator output is floating, you must connect the negative output to AIGND.

Figure 2. Calibrator to TB-4339/B/C Voltage and Ratio Mode Connections

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

AI4+

AI4–

AI5+

Voltage Out

AI5–

AI6+

AI6–

AI7+

AI7–

TB-4339/B/C

Calibrator

6|ni.com |NI PXIe-4339 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the NI PXIe-4339

meets published specifications.

• Keep connections to the NI PXIe-4339 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 TB-4339/B/C are secure.

• Use shielded copper wire for all cable connections to the TB-4339/B/C. Use twisted-pair

wire to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ± 5 °C. The NI PXIe-4339 temperature will be

greater than the ambient temperature.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 15 minutes to ensure that the NI PXIe-4339 measurement

circuitry is at a stable operating temperature.

• Ensure that the PXI/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.

Initial Setup

Refer to the NI PXIe-4339 and TB-4339/B/C Installation Guide and Terminal Block

Specifications 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 identifier. Each

function call uses this identifier to determine which DAQ device to verify or to verify

and adjust. This document uses Dev1 to refer to the device name. In the following

procedures, use the device name as it appears in MAX.

Verification

The following performance verification procedures describe the sequence of operation and

provide test points required to verify the NI PXIe-4339. The verification procedures assume that

adequate traceable uncertainties are available for the calibration references.

The NI PXIe-4339 has eight independent analog input channels. Each channel can be configured

for voltage mode or ratio mode. Voltage mode is used to measure voltages, and ratio mode is

used to provide excitation and measure from bridge-based sensors.

You can verify voltage mode for any or all of the channels depending upon your desired test

coverage. Ratio mode verification requires the use of voltage mode channels to internally

measure the excitation voltage of the ratio mode channel that is being verified. Voltage mode

channels used in ratio mode verification require that you determine gain adjust and offset adjust

values (ratio verification adjustment factors) prior to verifying ratio mode accuracy.

NI PXIe-4339 Calibration Procedure |© National Instruments |7

Voltage Mode Accuracy Verification

Complete the following steps to verify the voltage mode accuracy of the NI PXIe-4339.

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

2. Connect the calibrator to the TB-4339/B/C as shown in Figure 2.

• If the calibrator has a guard connection, leave it disconnected.

• If the calibrator output is floating, you must connect the negative output to AIGND.

3. Set the calibrator voltage output to a Test Point value for the appropriate Range shown in

Table 4, beginning with the values in the first row.

For the first test point, set the calibrator to operate mode (OPR) to enable output.

4. Acquire a voltage measurement with the NI PXIe-4339.

a. Create a DAQmx task.

b. Create and configure the AI channel according to the values shown in Table 3.

c. Start the task.

d. Average the readings that you acquired.

e. Clear the task.

f. Compare the resulting average to the Lower Limit and Upper Limit values in Table 4.

If the result is between these values, the device passes the test.

Table 3. AI Voltage Mode Setup

Configuration Value

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

Task AI Voltage

Sample Mode Finite number of samples

Sample Clock Rate 100

Samples Per Channel 100

Maximum Value Appropriate maximum range value from Table 4

Minimum Value Appropriate minimum range value from Table 4

Units Vo l t s

Table 4. Voltage Mode Accuracy Limits

Range (V)

Test Point (V) Lower Limit (V) Upper Limit (V)Minimum Maximum

-0.1 0.1 -0.095 -0.095131 -0.094869

-0.1 0.1 0-0.000074 0.000074

8|ni.com |NI PXIe-4339 Calibration Procedure

5. For each value in Table 4, repeat steps 3 through 4 for all channels.

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

7. Disconnect the calibrator from the terminal block.

Ratio Mode Accuracy Verification

Ratio mode verification uses paired channels in voltage mode to measure the excitation voltage

of the ratio mode channel that is being verified. The paired channels are connected via internal

circuitry on the NI PXIe-4339. The channel pairs are CH0 and CH1, CH2 and CH3, CH4 and

CH5, and CH6 and CH7.

To verify ratio mode accuracy, you will acquire a voltage measurement (Vmeas) for each paired

channel at 0 V and 9 V outputs. From these results, you can determine the ratio verification

adjustment factors, including the gain adjust (Gadj) and offset adjust (Oadj) values. The ratio

verification adjustment factors are then used to calculate the voltage adjustment (Vadj) value

for the paired channel.

-0.1 0.1 0.095 0.094869 0.095131

-0.2 0.2 -0.19 -0.190203 -0.189797

-0.2 0.2 0-0.000089 0.000089

-0.2 0.2 0.19 0.189797 0.190203

-0.5 0.5 -0.475 -0.475418 -0.474582

-0.5 0.5 0-0.000133 0.000133

-0.5 0.5 0.475 0.474582 0.475418

-10 10 -9.5 -9.507261 -9.492739

-10 10 0 -0.001561 0.001561

-10 10 9.5 9.492739 9.507261

Table 4. Voltage Mode Accuracy Limits (Continued)

Range (V)

Test Point (V) Lower Limit (V) Upper Limit (V)Minimum Maximum

NI PXIe-4339 Calibration Procedure |© National Instruments |9

Figure 3 shows the CH0/CH1 channel pair with CH0 configured for ratio mode verification and

CH1 configured to measure CH0 excitation voltage.

Figure 3. Ratio Mode Accuracy Verification

Complete the following steps to verify the ratio mode accuracy of the NI PXIe-4339.

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

2. Connect the calibrator to the TB-4339/B/C as shown in Figure 2.

• If the calibrator has a guard connection, leave it disconnected.

• If the calibrator output is floating, you must connect the negative output to AIGND.

3. Set the calibrator voltage output to 0 V.

4. Set the calibrator to operate mode (OPR) to enable output.

x1, x20,

x50, x100

EX1+

EX1–

EX0+

I/O

Connector

RS0+

AI0+

RS0–

EX0–

AI0–

Programmable

Excitation

Gain=1

or 0.25

Analog

Anti-Alias

Filter

Gain = 0.25

ADC

Reference

Input

2.5 V

–

EX1+

RS1+

AI1+

RS1–

EX1–

AI1–

Programmable

Excitation

Gain=1

or 0.25

x1, x20,

x50, x100

Analog

Anti-Alias

Filter

Gain = 0.25

ADC

Reference

Input

2.5 V

–

EX0+

EX0–

CH1

CH0

Vref +

–

10 |ni.com |NI PXIe-4339 Calibration Procedure

5. Acquire a voltage measurement with the NI PXIe-4339.

a. Create a DAQmx task.

b. Create and configure the AI channels according to the values shown in Table 5.

c. Start the task.

d. Average the readings that you acquired, and record the values as chx_zero, where x

is the channel number.

e. Clear the task.

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

6. Set the calibrator voltage output to 9 V.

7. Set the calibrator to operate mode (OPR) to enable output.

8. Acquire a voltage measurement with the NI PXIe-4339.

a. Create a DAQmx task.

b. Create and configure the AI channels according to the values shown in Table 5.

c. Start the task.

d. Average the readings that you acquired, and record the values as chx_9V, where xis

the channel number.

e. Clear the task.

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

9. Calculate the gain adjust (Gadj) and offset adjust (Oadj) of each channel using the

chx_zero and chx_9V values recorded in the previous steps according to the following

equation:

Gadj_chx = 9/(chx_9V - chx_zero)

Oadj_chx = chx_zero

Table 5. AI Voltage Mode Setup

Configuration Value

Channel Name Dev1/ai0:7

Task AI Voltage

Sample Mode Finite number of samples

Sample Clock Rate 100

Samples Per Channel 100

Maximum Value 10

Minimum Value -10

Units Vo l t s

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