National Instruments NI 4495 Calibration Procedure
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National Instruments NI 4495 Calibration Procedure

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Summary of Contents for National Instruments NI 4495

  • Page 1 PXI-4495...

  • Page 2: Table Of Contents

    Where to Go for Support ......................21 Software Requirements Calibrating the NI 4492/4497/4499 requires NI-DAQmx 9.2 or later. Calibrating the NI 4495/4496/4498 requires NI-DAQmx 8.8 or later. You can download the NI-DAQmx driver from . NI-DAQmx supports Self-Calibration and External Calibration in ni.com/downloads...

  • 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

    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...

  • 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

    0 (dB) Physical channel Dev_name/ai0 Coupling NI 4492: AC or DC NI 4495: DC NI 4496: AC NI 4497: AC or DC NI 4498: AC NI 4499: AC or DC Dev_name is the name shown for the NI 449x in MAX.
  • Page 8 AI 0 at the 0 dB gain setting. If verifying an NI 4495, compare this value to the limits in Table 4. The average is the offset for channel AI 0 at the 0 dB gain setting.

  • Page 9: Ai Ac Coupled Gain Accuracy Verification

    AI AC Coupled Gain Accuracy Verification Note This section does not apply to the NI 4495. Skip this section if verifying an NI 4495. Complete the following steps to verify AC coupled gain accuracy: Connect the output of the calibrator to channel AI 0 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

    Connect the output of the calibrator to channel AI 0 on the device. If verifying an NI 4495/4496/4498, configure the calibrator to generate a tone with the amplitude and frequency listed in the 0 dB gain row of Table 7. Wait 5 seconds for the inputs to settle.
  • Page 12 Set the amplitude to the value listed in Table 7 for the NI 4495/4496/4498 or Table 8 for the NI 4492/4497/4499 for the specific gain setting. When performing step 3, adjust the gain parameter appropriately.

  • 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.

  • Page 16: Adjustment

    Performing the calibration adjustment procedure automatically updates the calibration constants, date, and temperature in the EEPROM on the NI 449x device. There are two different adjustment procedures. One applies to the NI 4495/4496/4498 devices. The other applies to the NI 4492/4497/4499 devices.
  • 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.

This manual is also suitable for:

Ni 449 seriesNi 4496Ni 4498Ni 4492Ni 4497Ni 4499 ... Show all

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