National Instruments PXIe-4340 Handbuch

CALIBRATION PROCEDURE

NI PXIe-4340

4 Ch, 24-bit, 25.6 kS/s Simultaneous AC LVDT Input Module

This document contains the verification procedure for the National Instruments PXIe-4340

module.

Contents

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

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

PXIe-4340 Verification ............................................................................................................ 3

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

Connecting the TB-4340 .......................................................................................... 4

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

Initial Setup....................................................................................................................... 6

Accuracy Verification....................................................................................................... 6

Excitation Accuracy ................................................................................................. 6

Ratiometric Accuracy ............................................................................................... 9

EEPROM Update ............................................................................................................. 10

Specifications............................................................................................................................ 10

Worldwide Support and Services ............................................................................................. 10

Software

Calibrating the NI PXIe-4340 requires the installation of NI-DAQmx on the calibration system.

Driver support for calibrating the PXIe-4340 was first available in NI-DAQmx 16.1. 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

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2|ni.com |NI PXIe-4340 Calibration Procedure

Documentation

Consult the following documents for information about the PXIe-4340, NI-DAQmx, and your

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

software.

NI PXIe-4340 and TB-4340 User Guide and Terminal Block Specifications

NI-DAQmx driver software installation and hardware setup.

NI PXIe-4340 User Manual

PXIe-4340 usage and reference information.

NI PXIe-4340 Device Specifications

PXIe-4340 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-4340 Calibration Procedure |© National Instruments |3

PXIe-4340 Verification

This section provides information for verifying the PXIe-4340.

Test Equipment

Table 1 lists the equipment recommended for the performance verification procedures of the

PXIe-4340. If the recommended equipment is not available, select a substitute using the

requirements listed in Table 1.

Table 1. Recommended Equipment for PXIe-4340 Verification

Equipment Recommended Model Requirements

DMM PXI-4070 Use a DMM that has an accuracy

of ≤±60 µV when measuring

0 VDC with 10 Vpk AC and

≤±(0.05% + 10 mVrms) when

measuring 7 Vrms AC signals

from 400 Hz to 10 kHz.

PXI Express Chassis PXIe-1062Q If this chassis is unavailable, use

another PXI Express chassis,

such as the PXIe-1082 or

PXIe-1078.

Connection Accessory TB-4340 —

4|ni.com |NI PXIe-4340 Calibration Procedure

Connecting the TB-4340

The TB-4340 provides connections for the PXIe-4340. Figure 1 shows the pin assignments of

the TB-4340.

Figure 1. TB-4340 Circuit Board Parts Locator Diagram

S/N 159026B-01L NI TB-4340

EX+

EX–

RS+

RS–

AI+

AI–

AIGND

CHANNEL 0

EXCITATION

VERIFICATION

EX+

EX–

RS+

RS–

AI+

AI–

AIGND

CHANNEL 2

EXCITATION

VERIFICATION

EX+

EX–

RS+

RS–

AI+

AI–

AIGND

CHANNEL 1

EX+

EX–

RS+

RS–

AI+

AI–

AIGND

CHANNEL 3

PFIO

DGND

R11

R10

R13

R12

R15

R14

R17

R16

NI PXIe-4340 Calibration Procedure |© National Instruments |5

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

You can verify the accuracy for any or all channels depending on the desired test coverage.

Refer to Table 2 for the analog signal names of the TB-4340.

Test Conditions

The following setup and environmental conditions are required to ensure the PXIe-4340 meets

published specifications:

• Keep connections to the PXIe-4340 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-4340 are secure.

• Use shielded copper wire for all cable connections to the TB-4340. Use twisted-pair wire

to eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C. The PXIe-4340 temperature will be

greater than the ambient temperature. Maintain an internal device temperature range of

Tcal ± 5 °C for the PXI-4070.1

• Keep relative humidity below 80%.

• For valid test limits, the device must be within ±5 °C and 24 hours of the last

self-calibration.

Table 2. TB-4340 Analog Signal Names

Signal Name Signal Description

Excitation Verification + Positive excitation terminal for gross checks

Excitation Verification - Negative excitation terminal for gross checks

EX+ Positive excitation terminal

EX- Negative excitation terminal

RS+ Positive remote sense terminal

RS- Negative remote sense terminal

AIGND Analog input ground

AI+ Positive input voltage terminal

AI- Negative input voltage terminal

CT LVDT center tap connection

1 Tcal is the internal device temperature recorded by the PXI-4070 at the completion of the last

self-calibration.

6|ni.com |NI PXIe-4340 Calibration Procedure

• Allow a warm-up time of at least 15 minutes to ensure that the PXIe-4340 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-4340 and TB-4340 Installation Guide and Terminal Block Specifications

for information about how to install the software and hardware and how to configure the device

in NI 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. This

document uses Dev1 to refer to the device name. In the following procedures, use the

device name as it appears in MAX.

Accuracy Verification

The following performance verification procedures describe the sequence of operations and

provides the test points required to verify the PXIe-4340. The verification procedures assume

that adequate traceable uncertainties are available for the calibration references.

The PXIe-4340 has four independent analog input channels. You can verify the accuracy of any

or all of the channels depending upon your desired test coverage.

Excitation Accuracy

To connect the TB-4340 for excitation verification, install the PXIe-4340 and the TB-4340 in

the PXI Express chassis according to the instructions in the NI PXIe-4340 and TB-4340 User

Guide and Terminal Block Specifications. Do not use the excitation verification terminals as

they are only used for gross field checks and will introduce additional errors.

Complete the following steps to verify the excitation accuracy of the PXIe-4340:

1. Connect the PXI-4070 across the EX+ and EX- terminals of the channel to be verified.

2. Refer to Table 3 to configure the PXI-4070 and acquire a voltage measurement for DC

Offset.

NI PXIe-4340 Calibration Procedure |© National Instruments |7

3. Refer to Table 4 to configure the PXI-4070 and acquire a voltage measurement for AC

Amplitude.

Table 3. PXI-4070 Voltage Measurement Setup for DC Offset

Configuration Value

Function DC Volts

Range 10 V

Digital Resolution 6.5 digits

Aperture Time 100 ms

Autozero Once

ADC Calibration On

Input Impedance 10 MΩ

DC Noise Rejection High Order

Number of Averages 10

Power Line Frequency Dependent upon the local power line characteristics.

Table 4. PXI-4070 Voltage Measurement Setup for AC Amplitude

Configuration Value

Function AC Volts, DC Coupled

Range 50 V

Digital Resolution 6.5 digits

Aperture Time 200 ms

Autozero Once

ADC Calibration On

Input Impedance 1 MΩ

Minimum Frequency 20

Number of Averages 10

Power Line Frequency Dependent upon the local power line characteristics.

8|ni.com |NI PXIe-4340 Calibration Procedure

4. Configure a position measurement with the PXIe-4340.

a. Create a DAQmx task.

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

c. Commit the task.

d. Perform DC Offset and AC amplitude measurement(s) with the DMM.

e. Clear the task.

f. Compare the DC Offset measurement to the Limits in Table 6. If the measurement is

between these values, the devices passes the DC Offset test at this Excitation Voltage.

Table 5. PXIe-4340 AI LVDT Measurement Setup

Configuration Value

Channel Name Dev1/aix, where x refers to the channel number

Task AI Position LVDT

Sample Mode Finite Number of Samples

Sample Clock Rate 25600

Samples per Channel 25600

Maximum Value 1

Minimum Value -1

Voltage Excitation Wire Mode 4-wire

Voltage Excitation Source Internal

Voltage Excitation Value 7

Voltage Excitation Frequency 10000

Sensitivity Units mV/V/mm

Sensitivity 1

Units Meters

Table 6. DC Offset

Measurement Limits

DC Offset (All Amplitudes) ±10 mV

NI PXIe-4340 Calibration Procedure |© National Instruments |9

g. Compare the AC Amplitude measurement to the Excitation Accuracy Limits in

Table 7. If the measurement is between these values, the device passes the

AC Amplitude test at this Excitation Voltage.

5. Repeat step 4 for the other Voltage Excitation Values in Table 7.

6. Repeat steps 1 to 5 for each additional channel to be verified.

7. Disconnect the PXI-4070 from the TB-4340.

Ratiometric Accuracy

Complete the following steps to connect the TB-4340 for ratiometric accuracy verification:

1. Install the PXIe-4340 and the TB-4340 in the PXI Express chassis according to the

instructions in the NI PXIe-4340 and TB-4340 User Guide and Terminal Block

Specifications.

2. Connect AI+ and AI- according to the measurements in Table 8 for each measurement.

Complete the following steps for each measurement test point to verify the ratiometric accuracy

of the PXIe-4340:

1. Connect the channel as shown in Table 8. Leave all other pins disconnected.

2. Configure the channel as shown in Table 5 for 7 Vrms excitation.

3. Perform the configured AI LVDT measurement and average the acquired measurements.

4. Compare the resulting average to the Minimum Limit and Maximum Limit values shown in

Table 8. If the result is between these values, the device passes the test.

Table 7. Excitation Accuracy Limits

Measurement Nominal Maximum Limit Minimum Limit

Excitation Amplitude 7 Vrms Point 7 Vrms 7.35 Vrms 6.65 Vrms

Excitation Amplitude 5 Vrms Point 5 Vrms 5.25 Vrms 4.75 Vrms

Excitation Amplitude 3 Vrms Point 3 Vrms 3.15 Vrms 2.85 Vrms

Excitation Amplitude 1 Vrms Point 1 Vrms 1.05 Vrms 0.95 Vrms

Table 8. Verification Connections

Measurement Short AI+ to Short AI- to

Nominal

Reading

Maximum

Limit

Minimum

Limit

1 V/V EX+ EX- 1 V/V 1.0004000 V/V 0.999600 V/V

0 V/V AI- AI+ 0 V/V 0.000150 V/V -0.000150 V/V

-1 V/V EX- EX+ -1 V/V -0.999600 V/V -1.000400 V/V

Note: NI-DAQmx returns units scaled for length, while the PXIe-4340 accuracy is specified as a voltage

ratio. With sensitivity set to 1 mV/V/mm and output units set to meters as in Table 5, 1 meter is numerically

equivalent to 1 V/V.

377011A-01 Aug16

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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.

Note If any test fails verification, verify that you have met the verification test

conditions before returning your device to NI. Refer to Worldwide Support and

Services section for assistance in returning the device to NI.

EEPROM Update

In order to update the calibration date to track when the last verification was successfully

completed, initialize, and close a calibration sessions for Dev1 using the DAQmx Initialize

External Calibration VI and the DAQmx Close External Calibration VI.

Specifications

Refer to the NI PXIe-4340 Device Specifications document for detailed PXIe-4340 specification

information.

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

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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.

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information, support phone numbers, email addresses, and current events.

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