National Instruments PXIe-4480 Calibration Procedure
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National Instruments PXIe-4480 Calibration Procedure

6-channel, 24-bit, 1.25 ms/s dsa analog input
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CALIBRATION PROCEDURE
PXIe-4480/4481
6-Channel, 24-bit, 1.25 MS/s DSA Analog Input
This document contains the verification and adjustment procedures for the PXIe-4480 and
PXIe-4481 Dynamic Signal Acquisition (DSA) analog input modules. The procedures for the
PXIe-4481 are a subset of those for the PXIe-4480, specifically with regards to the absence of
the charge measurement function, which is available on the PXIe-4480, but not the PXIe-4481.
However, for clarity, the adjustment procedures for each module are listed separately. For more
information about calibration solutions, visit
.
ni.com/calibration
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3
Connecting the PXIe-4480/4481 .............................................................................................. 6
Test Conditions......................................................................................................................... 12
Initial Setup............................................................................................................................... 12
Verification ............................................................................................................................... 12
Adjustment (PXIe-4480) .......................................................................................................... 21
Adjustment (PXIe-4481) .......................................................................................................... 28
Reverification ........................................................................................................................... 33
Updating the Calibration Date without Performing Adjustment.............................................. 33
Specifications............................................................................................................................ 33
Where to Go for Support .......................................................................................................... 34

Software

Calibrating the PXIe-4480/4481 requires the installation of NI-DAQmx on the calibration
system. NI-DAQmx 16.1 added driver support for the PXIe-4480/4481. 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-DAQmx supports LabVIEW,
ni.com/downloads
™
™
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.

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  • Page 1: Table Of Contents

    PXIe-4481 Dynamic Signal Acquisition (DSA) analog input modules. The procedures for the PXIe-4481 are a subset of those for the PXIe-4480, specifically with regards to the absence of the charge measurement function, which is available on the PXIe-4480, but not the PXIe-4481.

  • Page 2: Documentation

    Documentation Consult the following documents for information about the PXIe-4480/4481, NI-DAQmx, and your application software. All documents are available on and help files install with the ni.com software. PXIe-4480/4481 Getting Started Guide NI-DAQmx driver software installation and hardware setup PXIe-4480/4481 Specifications...

  • Page 3: Test Equipment

    Table 1 lists the equipment recommended for the performance verification and adjustment procedures for the PXIe-4480. Table 2 lists the same for the PXIe-4481. If the recommended equipment is not available, select a substitute using the minimum requirements listed in the table.
  • Page 4 The minimum quantity corresponds to one channel at a time. The maximum quantity corresponds to all six channels simultaneously. † Charge verification/adjustment is optional. 4 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 5 Cable Instruments SHB12X-6BNC BNC Shorting Cap Pomona AI Offset Resistance: ≤50 Ω (quantity 6) Electronics 5085 Pomona Electronics 3840-50 BNC (F) to Banana Plug Pomona AI Gain Adapter Electronics 1269 NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 5...

  • Page 6: Connecting The Pxie-4480/4481

    The minimum quantity corresponds to one channel at a time. The maximum quantity corresponds to all six channels simultaneously. Connecting the PXIe-4480/4481 This section describes the options in connecting the PXIe-4480/4481 to the calibration equipment. Voltage Offset Accuracy Verification/Adjustment Figure 1 illustrates the connections for voltage offset accuracy verification/adjustment.
  • Page 7 Figure 2. Voltage Gain Accuracy/Flatness Connections (Six Channels) Calibrator BNC T-Connector Banana Plug Adapter InfiniBand 12X-6BNC Cable BNC Cable PXIe-4480/4481 Secure the cable to the module front panel using the cable connector Note jackscrews. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 7...
  • Page 8 Figure 3. Voltage Gain Accuracy/Flatness Connections (One Channel) Calibrator InfiniBand 12X-6BNC Cable Banana Plug Adapter PXIe-4480/4481 BNC Cable Secure the cable to the module front panel using the cable connector Note jackscrews. 8 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 9 BNC Cable Banana Plug Adapter InfiniBand 12X-6BNC Cable 10-32 to BNC Interface Cable PXIe-4480 Calibration Capacitor Secure the cable to the module front panel using the cable connector Note jackscrews. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 9...
  • Page 10 Figure 5 illustrates the connections for IEPE current accuracy verification. Figure 5. IEPE Current Accuracy Connections Digital Multimeter InfiniBand 12X-6BNC Cable Banana Plug Adapter PXIe-4480 BNC Cable Secure the cable to the module front panel using the cable connector Note jackscrews. 10 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 11 Figure 6. Timebase Accuracy Connections Function Generator InfiniBand 12X-6BNC Cable BNC Cable PXIe-4480/4481 BNC Shorting Cap Secure the cable to the module front panel using the cable connector Note jackscrews. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 11...

  • Page 12: Test Conditions

    The following setup and environmental conditions are required to ensure the PXIe-4480/4481 meets published specifications. • Keep connections to the PXIe-4480/4481 as short as possible. Long cables and wires act as antennas, picking up extra noise that can affect measurements. •...
  • Page 13 Voltage Offset Accuracy Verification Complete the following steps to verify the voltage offset accuracy: Using the equipment described in Table 1 (PXIe-4480) or Table 2 (PXIe-4481), connect the module as shown in Figure 1. Create and configure an AI voltage task on the device as shown in Table 3.
  • Page 14 Complete the following steps to verify the voltage gain accuracy: Using the equipment described in Table 1 (PXIe-4480) or Table 2 (PXIe-4481), connect the module to the calibrator as shown in Figure 2 (six channels) or Figure 3 (analog input channel 0).
  • Page 15 Complete the following steps to verify the voltage gain flatness: Using the equipment described in Table 1 (PXIe-4480) or Table 2 (PXIe-4481), connect the module to the calibrator as shown in Figure 2 (six channels) or Figure 3 (analog input channel 0).
  • Page 16 Repeat steps 2 through 8 for each range setting of the device. When performing step 2, configure the calibrator output to the amplitude and frequency indicated for the range to be verified. When performing step 3, set the range parameter to 5, 1, and 0.5 as required. 16 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 17 1kHz 1kHz Charge Input Performance Verification (PXIe-4480 only) This section verifies the charge input performance of the PXIe-4480. Charge Gain Accuracy Verification Complete the following steps to verify the charge gain accuracy. Using the equipment described in Table 1, connect analog input channel 0 of the module to the calibrator as shown in Figure 4.
  • Page 18 Calculate the RMS amplitude of the acquired fundamental harmonic. Compare this amplitude to the appropriate charge limits in Table 10. The calculated amplitude is used to verify the gain accuracy of the measured analog input channel at the 20,000 pC range setting. 18 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 19 Physical channel /ai0 Dev_name Range 10 (V) Coupling Terminal configuration Pseudodifferential Excitation (IEPE) 0.004 (A) Acquisition mode Finite number of samples Sample rate 102,400 Samples per channel 10,240 Start the task. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 19...
  • Page 20 Acquire readings with the PXIe-4480. The readings are not used; the task is simply run to set the device configuration. Measure the output current on the digital multimeter. Stop and clear the task. Compare this value to the appropriate limit in Table 13.

  • Page 21: Adjustment (Pxie-4480)

    Stop and clear the task. Adjustment (PXIe-4480) If the PXIe-4480 successfully passed each of the verification procedures within the As Left test limits without adjustment, then an adjustment is recommended, but not required, to warrant the published specifications for the next calibration interval. If the device was not within the As Left test limits, you can perform the adjustment procedure to improve the device accuracy and reset the calibration interval.
  • Page 22 It is possible to adjust the PXIe-4480 in either of two methods. The Minimum Time method adjusts the voltage gain of all channels in parallel, utilizing the cable connections shown in Figure 2. Alternatively, the Minimum Cabling method adjusts the voltage gain of each channel sequentially, utilizing the cable connections shown in Figure 3.
  • Page 23 17. Using the equipment described in Table 1, connect the output of the calibrator through the calibration capacitor to device input channel 0, as shown in Figure 4. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 23...
  • Page 24 EEPROM. Use the action if you want to save the new calibration constants in the device commit EEPROM. The device is now calibrated with respect to the external sources. 24 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 25 Minimum Cabling Method Complete the following performance adjustment procedures to adjust the PXIe-4480 using the “minimum cabling” method. To view a programming block diagram that provides an overview of this adjustment procedure, go to and enter the Info Code ni.com/info...
  • Page 26 18. Repeat steps 8 through 17 for each input channel, changing the cable connections accordingly and substituting the physical channels parameter with the channel being calibrated. All channels must be adjusted for gain for the calibration to be valid. Note 26 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 27 EEPROM. Use the action if you want to save the new calibration constants in the device commit EEPROM. The device is now calibrated with respect to the external sources. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 27...

  • Page 28: Adjustment (Pxie-4481)

    Updating the Calibration Date without Performing Adjustment section. The external calibration interval is listed in the PXIe-4480/4481 Specifications. An adjustment is required at least once within this interval. Performing the adjustment procedure automatically updates the calibration constants, date, and temperature in the device EEPROM.
  • Page 29 (DAQmx Adjust DSA AI DAQmxAdjustDSAAICalWithGainAndCoupling Calibration With Gain and Coupling VI from the DAQmx Adjust DSA AI Calibration Polymorphic VI), using the following parameters: calHandle: myCalHandle coupling: DAQmx_Val_AC gain: referenceVoltage: NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 29...
  • Page 30 Info Code ni.com/info PXIe448x Initialization Call (DAQmx Initialize External Calibration VI) to initialize the DAQmxInitExtCal calibration, using the following parameters: deviceName: Dev_name password: calHandle: &myCalHandle 30 | ni.com | NI PXIe-4480//4481 Calibration Procedure...
  • Page 31 DAQmxSetup4480Calibration calHandle: myCalHandle physical channels: cal mode: DAQmx_Val_Voltage Set the physical channels parameter to the channel of the device being Note calibrated, where 0, for example, represents channel 0. NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 31...
  • Page 32 EEPROM. Use the action if you want to save the new calibration constants in the device commit EEPROM. The device is now calibrated with respect to the external sources. 32 | ni.com | NI PXIe-4480//4481 Calibration Procedure...

  • Page 33: Reverification

    You can update the calibration date without performing the adjustment procedure. This might be appropriate if the PXIe-4480/4481 successfully passed each of the verification procedures within the As Left test limits without adjustment. Complete the following steps to update the...

  • Page 34: Where To Go For Support

    NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.

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Pxie-4481

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