National Instruments PXIe-4322 Manual

CALIBRATION PROCEDURE
NI PXIe-4322
8-Channel, Isolated Voltage/Current Analog Output Module
This document contains the verification and adjustment procedures for the National Instruments
PXIe-4322 module. For more information about calibration solutions, visit ni.com/
calibration.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Connecting the TB-4322 .................................................................................................. 3
Test Conditions......................................................................................................................... 5
Initial Setup............................................................................................................................... 5
Verification ............................................................................................................................... 6
Voltage Output Mode Accuracy Verification .................................................................. 6
Current Output Mode Accuracy Verification ................................................................... 8
Adjustment................................................................................................................................ 9
Voltage Output Mode Adjustment Procedure .................................................................. 9
Current Output Mode Adjustment Procedure................................................................... 11
EEPROM Update ..................................................................................................................... 12
Re-Verification ......................................................................................................................... 12
Specifications............................................................................................................................ 12
Where to Go for Support .......................................................................................................... 13
Software
Calibrating the NI PXIe-4322 requires the installation of NI-DAQmx 9.7 or later on the
calibration system. 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 ADE that you intend to use.

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Documentation
Consult the following documents for information about the NI PXIe-4322, NI-DAQmx, and
your application software. All documents are available on ni.com and help files install with the
software.
NI PXIe-4322 and TB-4322 Installation Guide and Terminal Block Specifications
Contains: NI-DAQmx installation and hardware setup
NI PXIe-4322 User Manual
Contains: NI PXIe-4322 specific information
NI PXIe-4322 Specifications
Contains: NI PXIe-4322 specifications and calibration interval
NI-DAQmx Readme
Contains: Operating system and application software support in NI-DAQmx
NI-DAQmx Help
Contains: Information about creating applications that use the NI-DAQmx driver
LabVIEW Help
Contains: LabVIEW programming concepts and reference information about NI-DAQmx
VIs and functions
NI-DAQmx C Reference Help
Contains: Reference information for NI-DAQmx C functions and NI-DAQmx C properties
NI-DAQmx .NET Help Support for Visual Studio
Contains: 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-4322 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.
Connecting the TB-4322
Caution Always have the NI PXI Express chassis powered off when inserting a
module into the chassis.
The TB-4322 terminal block provides connections to the NI PXIe-4322. Figure 1 shows the
connector location for each TB-4322 channel.
Table 1. Recommended Equipment
Equipment
Recommended
Model Requirements
DMM NI PXI-4071 Use a DMM that can provide both voltage and
current measurements.
Accuracy of 20 ppm or better in the smallest range
to measure 16 V, and offset error of 2.4 µV or
better in the smallest range to measure 1 V.
Accuracy of 165 ppm or better in the smallest
range to measure 20 mA, and offset error of 3 nA
or better in the smallest range to measure 100 µA.
PXI Express
Chassis
NI PXIe-1062Q —
Connection
Accessory
TB-4322 —

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Figure 1. TB-4322 Pinout Locations
1. Connect the DMM to the TB-4322.
• For voltage verification and adjustment connect the DMM to the TB-4322 as shown
in Figure 2 for each channel.
or
• For current verification and adjustment connect the DMM to the TB-4322 as shown
in Figure 3 for each channel.
Figure 2. DMM to TB-4322 Voltage Mode Connections
Figure 3. DMM to TB-4322 Current Mode Connections
®
TB-4322
FOR PATENTS:NI.COM/PATENTS
AO7+
AO7–
AO6+
AO6–
AO5+
AO5–
AO4+
AO4–
AO3+
AO3–
AO2+
AO2–
AO1+
AO1–
AO0+
AO0– J9
©COPYRIGHT 2012
DMM TB-4322
AO+
AO–
HI
LO
Voltage In
DMM TB-4322
AO+
AO–
HI
LO
Current In

NI PXIe-4322 Calibration Procedure |© National Instruments |5
Each channel consists of two terminal connections specific to that channel as shown in Table 2
and must be verified and adjusted individually. Do not make serial or parallel connections for
verification or adjustment.
Test Conditions
The following setup and environmental conditions are required to ensure the NI PXIe-4322
meets published specifications.
• Keep connections to the NI PXIe-4322 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-4322 are secure.
• Use shielded copper wire for all cable connections to the TB-4322. Use twisted-pairs wire
to eliminate noise.
• Maintain an ambient temperature of 23 °C ± 5 °C.
• The NI PXIe-4322 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-4322 measurement
circuitry 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.
Initial Setup
Refer to the NI PXIe-4322 and TB-4322 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 with MAX, it is assigned a device identifier.
Each function call uses this identifier to determine which DAQ device to verify or,
verify and adjust.
Table 2. TB-4322 Analog Signal Names
Signal Name Signal Description
AO+ Positive output terminal
AO- Negative output terminal

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Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI PXIe-4322. The verification procedures assume that
adequate traceable uncertainties are available for the calibration references.
The NI PXIe-4322 has eight independent isolated analog output channels. Each channel can be
configured as voltage output mode or current output mode. You can verify either voltage or
current for any or all of the channels depending upon your desired test coverage.
Voltage Output Mode Accuracy Verification
Complete the following procedure to verify the voltage mode accuracy of the NI PXIe-4322:
1. Connect the DMM to the TB-4322 as shown in Figure 2 for the first channel you want to
verify.
2. Use the information in Table 3 to configure the DMM.
Table 3. DMM Voltage Setup
Configuration Value
Measurement Vo l t a g e
Range
1 V (for 0 V test point)
Minimum range to measure 16 V
(for all other test points)
Digits Resolution 7.5
Aperture Time 100 ms
Autozero On
ADC Calibration On
Input Impedance
Offset Nulling On
10 MΩ
DC Noise Rejection High order
Number of Average 1
Power Line Frequency Dependent upon the local power line characteristics.

NI PXIe-4322 Calibration Procedure |© National Instruments |7
3. Generate a voltage with the NI PXIe-4322.
a. Create a task.
b. Create and configure the AO channel according to the values found in Table 4.
c. Write the voltage value to the task.
d. Use the DMM to read the voltage measurement value.
e. Clear the task.
f. Compare each measured value to the Upper Limit and Lower Limit values in Table 5.
4. Repeat step 3 for all voltage values listed in Table 5.
5. Disconnect the DMM from the terminal block.
6. Repeat steps 3 through 5 for every channel.
Table 4. AO Voltage Mode Setup
Configuration Value
Channel Name Dev1/aox, where xrefers to the channel number.
Task AO Voltage
Maximum Value 16
Minimum Value -16
Units Vo l t s
Table 5. Voltage Mode Accuracy Limits
Test Points (V) Lower Limit (V) Upper Limit (V)
-15.2 -15.2032 -15.1968
0-0.00112 0.00112
15.2 15.1968 15.2032

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Current Output Mode Accuracy Verification
Complete the following procedure to verify the current mode accuracy of the NI PXIe-4322:
1. Connect the DMM to the TB-4322 as shown in Figure 3 for the first channel you want to
verify.
2. Set the DMM for current measurement and use the information in Table 6 to configure
the DMM.
3. Generate a current with the NI PXIe-4322.
a. Create a task.
b. Create and configure the AO channel according to the values in Table 7.
Table 6. DMM Current Setup
Configuration Value
Measurement Current
Range
100 µA (for 0 mA test point)
Minimum range to measure 20 mA
(for all other test points)
Digits Resolution 6.5
Aperture Time 100 ms
Autozero On
ADC Calibration On
DC Noise Reduction High order
Number of Average 1
Power Line Frequency Dependent upon the local power line characteristics.
Table 7. AO Current Mode Setup
Configuration Value
Channel Name Dev1/aox, where xrefers to the channel number.
Task AO Current
Maximum Value 0.02
Minimum Value -0.02
Units Amps

NI PXIe-4322 Calibration Procedure |© National Instruments |9
c. Write the current value to task.
d. Use the DMM to read the current measurement value.
e. Clear the task.
f. Compare each measured value to the Upper Limit and Lower Limit values in Table 8.
4. Repeat step 3 for all current values listed in Table 8.
5. Disconnect the DMM from the terminal block.
6. Repeat steps 3 through 5 for every channel you want to verify.
Adjustment
The following performance adjustment procedures describe the sequence of operation required
to adjust the NI PXIe-4322.
Voltage Output Mode Adjustment Procedure
Complete the following procedure to adjust the voltage mode accuracy of the NI PXIe-4322:
1. Connect the DMM to the TB-4322 as shown in Figure 2 for the channel you want to adjust.
2. Use the information in Table 9 to configure the DMM.
Table 8. Current Mode
Test Points (mA) Lower Limit (mA) Upper Limit (mA)
-19 -19.0101 -18.9899
0-0.0038 0.0038
19 18.9899 19.0101
Table 9. DMM Voltage Setup
Configuration Value
Measurement Vo l t a g e
Range
Minimum range to measure 16 V
(for the first to tenth test points)
1 V (for the eleventh test point)
Digits Resolution 7.5
Aperture Time 100 ms
Autozero On
ADC Calibration On

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3. Adjust the NI PXIe-4322 voltage output accuracy.
a. Open a calibration session for the NI PXIe-4322. The default password is NI.
b. Connect the DMM to the TB-4322 as shown in Figure 2 for one channel.
c. Call the 4322 instance of the DAQmx Get SC Express Calibration Adjustment Point
function to obtain 11 points for adjustment.
d. Call the DAQmx Setup SC Express Calibration function and configure it as follows:
e. Measure the voltage using the DMM.
f. Call the 4322 instance of the DAQmx Adjust SC Express Calibration function and
configure it as follows:
g. For each adjustment point from first to tenth, repeat steps d to f.
h. For eleventh point, change the DMM input range to 1 V then repeat steps d to f.
i. Repeat steps b to h for every channel.
j. Close the calibration session.
4. Disconnect the DMM from the terminal block.
Input Impedance
Offset Nulling On
10 MΩ
DC Noise Rejection High order
Number of Averages 1
Power Line Frequency Dependent upon the local power line characteristics.
Physical Channels Output Type Output Value
Dev1aox Vo l t a g e The value obtained from step c.
Physical Channels Reference Value
Dev1aox The voltage value obtained in step e.
Table 9. DMM Voltage Setup (Continued)
Configuration Value