National Instruments PXIe-4339 Manual

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
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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+
T–
T+
SCA
SCA
SCA
SCA
SCA
SCA
SCA
SCA SCA
SCA
SCA
SCA
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
QTR
QTR
QTR
QTR
QTR
QTR
QTR
A1
B1
C1
o
S/NS/N
o
155411A-01L155411A-01L
NI TB-4339NI TB-4339
o
J15
CR2
R7
R4
R22
R10
R3
R21
J11
J10
U3
C5
C4
R6
R1
R18
C2
J8
R11R15
J18
J16
R23
R16
R9
R2
J12
J5
J3
J19
C3
U1
R24
J17
J6
J7
U4
R25
R12
R26
C6
J9
C1
R13
CR1
J13
R5
J2
R8
J14
R19
J4
J1
R14
R20
U2
FOR PATENTS: NI.COM/PATENTS
N114N114
COPYRIGHT 2013

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+
HI
LO
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