National Instruments NI 9219 Calibration Procedure
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National Instruments NI 9219 Calibration Procedure

4-channel, 24-bit, universal analog input module
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CALIBRATION PROCEDURE
NI 9219
4-Channel, 24-Bit, Universal Analog Input Module
This document contains information for calibrating the NI 9219. For more information on
calibration, visit
ni.com/calibration
Contents
Software.................................................................................................................................... 2
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 4
Initial Setup............................................................................................................................... 5
Verification............................................................................................................................... 5
Voltage Accuracy Verification ......................................................................................... 5
Thermocouple Accuracy Verification .............................................................................. 8
Current Accuracy Verification ......................................................................................... 10
2-Wire Resistance Accuracy Verification ........................................................................ 11
Quarter-Bridge Accuracy Verification ............................................................................. 13
4-Wire Resistance Accuracy Verification ........................................................................ 15
4-Wire RTD Accuracy Verification ................................................................................. 17
3-Wire RTD Accuracy Verification ................................................................................. 19
Half-Bridge Accuracy Verification .................................................................................. 22
Full-Bridge Accuracy Verification ................................................................................... 27
Adjustment................................................................................................................................ 31
Voltage and Thermocouple Accuracy Adjustment .......................................................... 31
Current Accuracy Adjustment .......................................................................................... 32
4-Wire and 2-Wire Resistance Accuracy Adjustment...................................................... 33
Half-Bridge Accuracy Adjustment ................................................................................... 35
Full-Bridge Accuracy Adjustment.................................................................................... 37
EEPROM Update ..................................................................................................................... 38
Reverification ........................................................................................................................... 38
Accuracy Under Calibration Conditions .................................................................................. 38
NI Services ............................................................................................................................... 40
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  • Page 1: Table Of Contents

    CALIBRATION PROCEDURE NI 9219 4-Channel, 24-Bit, Universal Analog Input Module This document contains information for calibrating the NI 9219. For more information on calibration, visit ni.com/calibration Contents Software............................ 2 Documentation.......................... 2 Test Equipment......................... 2 Test Conditions......................... 4 Initial Setup..........................5 Verification..........................

  • Page 2: Software

    Software Calibrating the NI 9219 requires the installation of NI-DAQmx 9.3 or later on the calibration system. You can download NI-DAQmx from . NI-DAQmx supports ni.com/downloads 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.
  • Page 3 1 V ≤ μ V offset error in smallest range. ≤ Current Accuracy 270 ppm uncertainty for current, ≤ 2 nA offset error in smallest range NI 9219 Calibration Procedure | © National Instruments Corporation | 3...

  • Page 4: Test Conditions

    • Keep relative humidity below 80%. • Allow a warm-up time of at least 10 minutes to ensure that the NI 9219 measurement circuitry is at a stable operating temperature. 4 | ni.com | NI 9219 Calibration Procedure...

  • Page 5: Initial Setup

    Complete the following steps to set up the NI 9219. Install the NI-DAQmx driver software. Install the NI 9219 in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the NI cDAQ-9178 chassis empty. Launch Measurement & Automation Explorer (MAX).
  • Page 6 Acquire a voltage reading with the DMM. Record this measurement as V Acquire and average samples. Create an AI voltage task on the NI 9219 according to Table 2. Table 2. NI 9219 Configuration for Voltage Accuracy Verification Measurement Type...
  • Page 7 Sample Timing Type High Resolution On Demand Start the task. Acquire 20 voltage readings with the NI 9219 and average the readings. Record the average of the readings as V channel Clear the task. Perform the following calculation using the recorded V and V values.

  • Page 8: Thermocouple Accuracy Verification

    Note Set the source output to zero. 10. Repeat steps 2 through 9 for all test points on the NI 9219. 11. Repeat steps 2 through 10 for all channels on the NI 9219. 12. Disconnect the source and the DMM from the device.
  • Page 9 Note 10. Set the source output to zero. 11. Repeat steps 2 through 10 for all test points on the NI 9219. 12. Repeat steps 2 through 11 for all channels on the NI 9219. 13. Disconnect the source and the DMM from the device.

  • Page 10: Current Accuracy Verification

    Current Accuracy Verification Complete the following steps to verify the current accuracy of an NI 9219. Connect the NI 9219 to the DMM and source as shown in Figure 3. Figure 3. Current Accuracy Verification Connections to the NI 9219 AMPS I–...

  • Page 11: 2-Wire Resistance Accuracy Verification

    Set the source to zero. Repeat steps 2 through 8 for all test points listed in Table 10. 10. Repeat steps 2 through 9 for all channels listed on the NI 9219. 11. Disconnect the source and the DMM from the device.
  • Page 12 Connect the NI 9219 to the resistor and the DMM as shown in Figure 4. Connect the leads of the DMM as close as possible to the terminals on the NI 9219 to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 2-wire measurement.

  • Page 13: Quarter-Bridge Accuracy Verification

    NI 9219. • Connect the leads of the DMM as close as possible to the terminals on the NI 9219 to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 quarter-bridge measurement.
  • Page 14 Create an AI voltage channel in the 1 V range on the NI 9219. Commit the task to place the NI 9219 in voltage mode. This prevents the module from interfering with the resistance measurements of the DMM. Configure the DMM for a 4-wire resistance measurement in the appropriate range according to the appropriate test point from Table 16.

  • Page 15: 4-Wire Resistance Accuracy Verification

    Connect the NI 9219 to the resistor and the DMM as shown in Figure 6. Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 (HI and LO) connect to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 4-wire measurements.
  • Page 16 Create an AI voltage channel in the 1 V range on the NI 9219. Commit the task to place the NI 9219 in voltage mode. This prevents the module from interfering with the resistance measurements of the DMM. Configure the DMM for a 4-wire resistance measurement in the appropriate range according to the appropriate test point from Table 19.

  • Page 17: 4-Wire Rtd Accuracy Verification

    Connect the NI 9219 to the resistor and the DMM as shown in Figure 7. Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 (HI and LO) connect to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 4-wire measurements.
  • Page 18 Create an AI voltage channel in the 1 V range on the NI 9219. Commit the task to place the NI 9219 in voltage mode. This prevents the module from interfering with the resistance measurements of the DMM. Configure the DMM for a 4-wire resistance measurement in the appropriate range according to the appropriate test point from Table 22.

  • Page 19: 3-Wire Rtd Accuracy Verification

    3-Wire RTD Accuracy Verification Complete the following steps to verify the 3-Wire RTD accuracy of an NI 9219. Connect the NI 9219 to the resistor and the DMM as shown in Figure 8. Connect the Ω and Ω leads of the DMM directly to the spring-terminal connector of the NI 9219 and senseHI the Ω...
  • Page 20 DMM as close as possible to the senseHI same point where the LO lead from the NI 9219 connects to the resistor and the Ω the Ω leads of the DMM directly to the spring-terminal connector of the NI 9219.
  • Page 21 Acquire and average samples. Create an AI RTD task on the NI 9219 according to Table 23. Table 23. NI 9219 Configuration for 3-Wire RTD Accuracy Verification Measurement Excitation Excitation Resistance Type Min (°C) (°C) Source Value Config 3-Wire RTD Internal 0.0005...

  • Page 22: Half-Bridge Accuracy Verification

    The test limits listed in Table 25 are derived using the values in Table 53. Note 10. Disconnect the resistor from the device. 11. Repeat steps 1 through 10 for all test points on the NI 9219. 12. Repeat steps 1 through 11 for all channels on the NI 9219. Half-Bridge Accuracy Verification Complete the following steps to verify the half-bridge accuracy of an NI 9219.
  • Page 23 . Using a range larger than necessary creates unwanted additional noise. ExcitationModule Connect the NI 9219 to DMM1, DMM2, and the voltage source as shown in Figures 11, 12, or 13 for the appropriate test point value indicated in Table 30. Observe the following conditions when connecting the equipment to the NI 9219.
  • Page 24 Figure 11. Half-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 2) V– Source 1 kΩ ± 1% 5 kΩ ± 1% DMM1 5 kΩ ± 1% DMM2 EX+ (3) 1 kΩ ± 1% HI (4) Ch x EX– (5) NI 9219 Figure 12.
  • Page 25 Enable Auto Zero on DMM1. Configure DMM2 for a voltage measurement in the 10 V range. Enable Auto Zero on DMM2. Create an AI bridge (V/V) task on the NI 9219 to Table 26. Table 28. NI 9219 Configuration for Half-Bridge Accuracy Verification Measurement...
  • Page 26 The test limits listed in Table 30 are derived using the values in Table 53. Note 11. Repeat steps 6 through 10 for all test points. 12. Repeat steps 1 through 11 for all channels on the NI 9219. 26 | ni.com | NI 9219 Calibration Procedure...

  • Page 27: Full-Bridge Accuracy Verification

    Full-Bridge Accuracy Verification Complete the following steps to verify the full-bridge accuracy of an NI 9219. Connect the NI 9219 to DMM1 as shown in Figure 14. Figure 14. Full-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 1) DMM1...
  • Page 28 . Using a range larger than necessary creates unwanted additional noise. ExcitationModule Connect the NI 9219 to DMM1, DMM2, and the source as shown in Figures 15 or 16 for the appropriate test point value indicated in Table . Observe the following conditions when connecting the equipment to the NI 9219.
  • Page 29 Enable Auto Zero on DMM1. Configure DMM2 for a voltage measurement in the 1 V range. Enable Auto Zero on DMM2. Create an AI bridge (V/V) task on the NI 9219 to Table 33. Table 33. NI 9219 Configuration for Full-Bridge Accuracy Verification Measurement...
  • Page 30 –11.9 11.9 120 Ω Config. 3 –12.6 12.6 ±5% 11. Repeat steps 6 through 10 for all test points. 12. Repeat steps 1 through 11 for all channels on the NI 9219. 30 | ni.com | NI 9219 Calibration Procedure...

  • Page 31: Adjustment

    0.125 Input the external temperature in degrees Celsius. Call the NI 9219 get C Series adjustment points function to obtain an array of recommended calibration voltages for the NI 9219. Set the source to a reference value determined by the array of recommended calibration voltages.

  • Page 32: Current Accuracy Adjustment

    No Bridge Input the external temperature in degrees Celsius. Call the NI 9219 get C Series adjustment points function to obtain an array of recommended calibration currents for the NI 9219. Set the source to a reference value determined by the array of recommended calibration current.

  • Page 33: 4-Wire And 2-Wire Resistance Accuracy Adjustment

    Connect the NI 9219 to the resistor and the DMM as shown in Figure 6. Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 (HI and LO) connect to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 4-wire measurements.

  • Page 34: 4-Wire Rtd, 3-Wire Rtd, And Quarter-Bridge Accuracy Adjustment

    Connect the NI 9219 to the resistor and the DMM as shown in Figure 7. Connect the sense leads of the DMM as close as possible to the same point that the sense leads of the NI 9219 (HI and LO) connect to the resistor to ensure that the DMM reference measurements include the same lead wire resistance as the NI 9219 4-wire measurements.

  • Page 35: Half-Bridge Accuracy Adjustment

    Adjust the NI 9219 Half-Bridge accuracy. Initialize a calibration session on the NI 9219. The default password is Call and configure the NI 9219 setup calibration function, to place the channel in RTD mode, according to Table 41. NI 9219 Calibration Procedure | © National Instruments Corporation | 35...
  • Page 36 Observe the following conditions when connecting the equipment to the NI 9219. • Connect the leads of DMM1 as close as possible to the terminals on the NI 9219. • Connect the HI lead of DMM2 as close as possible to the same point that the HI lead of the NI 9219 connects to the resistor network.

  • Page 37: Full-Bridge Accuracy Adjustment

    NI 9219. • Connect the leads of DMM1 as close as possible to the terminals on the NI 9219. • Connect the HI lead of DMM2 as close as possible to the same point that the HI lead of the NI 9219 connects to the resistor network.

  • Page 38: Eeprom Update

    Repeat steps i through o for every value in the array. Close the calibration session. Disconnect the DMMs and the resistors from the device. Repeat steps 1 through 3 for each channel on the NI 9219. EEPROM Update When an adjustment procedure is completed, the NI 9219 internal calibration memory (EEPROM) is immediately updated.
  • Page 39 –62.5 mV/V 62.5 mV/V Full-Bridge 7.8 mV/V –7.8125 mV/V 7.8125 mV/V 1526 For operational specifications, refer to the most recent NI 9219 Operating Note Instructions and Specifications online at ni.com/manuals NI 9219 Calibration Procedure | © National Instruments Corporation | 39...

  • Page 40: Ni Services

    For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and...

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