National Instruments NI 449 Series Calibration Procedure
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National Instruments NI 449 Series Calibration Procedure

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  • Page 1 PXI-4496...

  • Page 2: Table Of Contents

    NI 449x Calibration Procedure Français Deutsch ni.com/manuals This document contains information about calibrating the National Instruments 449x devices. For more information about calibration, visit ni.com/calibration Contents Software Requirements......................1 Documentation Requirements ....................2 Calibration Interval........................2 Test Equipment......................... 3 Test Conditions......................... 4 Calibration Procedures ......................

  • Page 3: Documentation Requirements

    Calibration Interval National Instruments recommends an external calibration interval of one year for the NI 449x. Additionally, self-calibration can be performed as desired, but is recommended when the operating temperature exceeds 5 °C from the operating temperature of the previous calibration.

  • Page 4: Test Equipment

    Test Equipment National Instruments recommends that you use the equipment in Table 1 for calibrating the NI 449x. Table 1. Recommended Equipment Recommended Parameter Equipment Model Measured Minimum Requirements Calibrator Fluke 5700A AI AC Frequency Range: coupled 20 Hz to 92.2 kHz...

  • Page 5: Test Conditions

    Table 1. Recommended Equipment (Continued) Recommended Parameter Equipment Model Measured Minimum Requirements BNC Cable Pomona Characteristic Impedance: Electronics 5697 50 Ω NI 4495/4496/4497/ 4498/4499: quantity 17 NI PXIe-4492: quantity 9 BNC T-Connector Pomona Adjustment Characteristic Impedance: Electronics 4896 50 Ω NI 4495/4496/4497/ 4498/4499: quantity 15 NI PXIe-4492:...

  • Page 6: Calibration Procedures

    Test limits in Tables 3 through 8, and Tables 13 through 15 are based upon the May 2012 edition of the NI 449x Specifications. Refer to the most recent NI 449x Specifications online at ni.com/manuals NI 449 x Calibration Procedure | © National Instruments | 5...

  • Page 7: Analog Input Performance Verification

    Analog Input Performance Verification This section verifies the analog input (AI) performance of all NI 449x devices. Refer to the NI 449x Specifications for the number of channels and performance specifications. AI Offset Verification Complete the following steps to verify the AI offset: Connect a BNC shorting cap to channel AI 0 on the device and wait 5 seconds for the inputs to settle.
  • Page 8 Table 6. Supported Gain Settings Device Gain Settings NI 4492 NI 4495 0 dB, 20 dB NI 4496 NI 4497 NI 4498 0 dB, 10 dB, 20 dB, 30 dB NI 4499 NI 449 x Calibration Procedure | © National Instruments | 7...

  • Page 9: Ai Ac Coupled Gain Accuracy Verification

    If verifying an NI 4492/4497/4499, separately verify AC and DC coupling for each supported gain setting including 0 dB at sample rates of 102.4 kS/s and 204.8 kS/s. Refer to Table 6 for the gain settings supported by supported by NI 449x devices. Repeat steps 1 through 8 for all input channels on the device.
  • Page 10 Table 7 lists the amplitude and frequency to use for each gain setting. When performing step 3, adjust the gain parameter appropriately. NI 449 x Calibration Procedure | © National Instruments | 9...

  • Page 11: Ai Flatness Verification

    Table 10. NI 4492/4496/4497/4498/4499 Supported Gain Settings Device Gain Settings NI 4492 NI 4496 0 dB, 20 dB NI 4497 NI 4498 0 dB, 10 dB, 20 dB, 30 dB NI 4499 If verifying an NI 4492/4497/4499, repeat steps 2 through 8 for each gain setting that your device supports.
  • Page 12 Table 12. Supported Gain Settings Device Gain Settings NI 4492 NI 4495 0 dB, 20 dB NI 4496 NI 4497 NI 4498 0 dB, 10 dB, 20 dB, 30 dB NI 4499 NI 449 x Calibration Procedure | © National Instruments | 11...

  • Page 13: Ai Dc Coupled Gain Accuracy Verification

    Table 13. Maximum AI Flatness Specifications (Relative to 1 kHz) Frequency Band Flatness (dB) 20 Hz to 20 kHz ±0.005 20 kHz to 45 kHz ±0.016 45 kHz to 92.2 kHz ±0.08 Table 14. AI Flatness Limits Test Limit Calibrator Output Frequency (Hz) 0.99942 * V 1.00058 * V...
  • Page 14 5 mV. The calculated average is used to verify the DC coupled gain accuracy of channel AI 0 at the 0 dB gain setting, at the 204.8 kS/s sample rate. NI 449 x Calibration Procedure | © National Instruments | 13...

  • Page 15: Timebase Frequency Accuracy Verification (Optional)

    If verifying an NI 4495, repeat steps 2 through 7 for each gain setting that your device supports. Refer to Table 17 for the gain settings supported by NI 449x devices. In step 2, change the output of the voltage source based on the gain setting that is being verified. Table 15 lists the DC voltage to use for each gain setting.

  • Page 16: Adjustment

    Connect the output of the calibrator to all input channels on the device, using the BNC T-connectors to split the signal in a tree formation to all the inputs. Configure the calibrator to output a 200 mV signal at 1 kHz. NI 449 x Calibration Procedure | © National Instruments | 15...
  • Page 17 Initialize the AI calibration using the DAQmx Initialize External Calibration VI, as shown below. Note Refer to the NI-DAQmx function parameters for the LabVIEW input values. LabVIEW Block Diagram NI-DAQmx Function Call Call with the DAQmxInitExtCal following parameters: deviceName: Dev_name password: calHandle: &myCalHandle...

  • Page 18: Analog Input Adjustment For Ni 4492/4497/4499 Devices

    Note Refer to the NI-DAQmx function parameters for the LabVIEW input values. LabVIEW Block Diagram NI-DAQmx Function Call Call with the DAQmxInitExtCal following parameters: deviceName: Dev_name password: calHandle: &myCalHandle NI 449 x Calibration Procedure | © National Instruments | 17...
  • Page 19 Configure the calibrator to output a tone with the amplitude and frequency listed in the 0 dB gain row of Table 19. Table 19. Calibrator Output for AI AC Coupled Calibration Adjustment on NI 4492/4497/4499 Calibrator Output Device Gain Amplitude (V Frequency (Hz) 0 dB 6.36...
  • Page 20 NI 449x devices. When performing step 7, adjust the output of the voltage source based on the amplitudes in Table 20. When performing step 8, adjust the gain and reference voltage parameters appropriately. NI 449 x Calibration Procedure | © National Instruments | 19...

  • Page 21: Updating The Calibration Date And Time Without Performing Adjustment

    10. Finish the AI calibration with the DAQmx Close External Calibration VI, as shown below. Use the action if there has been any error during the AI calibration or if you do not cancel want to save the new AI calibration constants in the device EEPROM. Use the action if you want to save the new AI calibration constants in the device EEPROM.

  • Page 22: Where To Go For Support

    Instruments Patents Notice at ni.com/patents. 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. © 2008–2012 National Instruments. All rights reserved.

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