National Instruments PXIe-4340 Manual

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
C1
B1
A1
COPYRIGHT 2015
S/N 159026B-01L NI TB-4340
EX+
EX–
RS+
RS–
AI+
AI–
CT
AIGND
CHANNEL 0
EXCITATION
VERIFICATION
EX+
EX–
RS+
RS–
AI+
AI–
CT
AIGND
CHANNEL 2
EXCITATION
VERIFICATION
EX+
EX–
RS+
RS–
AI+
AI–
CT
AIGND
CHANNEL 1
EX+
EX–
RS+
RS–
AI+
AI–
CT
AIGND
CHANNEL 3
PFIO
DGND
R11
R10
R13
R12
R15
R14
R17
R16
R
C

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.

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377011A-01 Aug16
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Note If any test fails verification, verify that you have met the verification test
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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.
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