NI 671x/672x/673x Calibration Procedure

Calibration Executive 6.0 Help

Edition Date: July 2020

Part Number: 374564Y-01

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This topic contains information for calibrating the NI 671x/672x/673x using Calibration Executive.

Calibration Executive Procedure Features:

Adjustment

Supported
Manual Mode

Supported
Selectable Test Points

Unsupported

Approximate Test Time: (NI 671x) 8 minutes, (NI 672x) 35 minutes, (NI 673x) 11 minutes

Test Equipment| Test Conditions| Device Setup| Troubleshooting Guidelines| Test Limit Equations

Test Equipment

The following table lists the test equipment required to calibrate NI 671x/672x/673x modules.

Instrument Recommended Model Where Used Requirements
Calibrator Fluke 5700A Adjustment If that instrument is unavailable, use a high-precision voltage source that is at least 50 ppm accurate for 12- and 13-bit boards and 10 ppm for 16-bit boards.
DMM PXI-4070, Agilent 3458A Analog Output If these instruments are unavailable, use a multi-ranging 5 1/2-digit DMM with an accuracy of 40 ppm
Counter Agilent 53131A Counter If this instrument is unavailable, use a counter with an accuracy of 0.01%.
DAQ Accessory SCB-68 Adjustment,
Analog Output,
Counter
Shielded I/O connector block with 68 screw terminals for easy signal connection to 68- or 100-pin DAQ devices.
CB-68LP, CB-68LPR, TBX-68 Low-cost termination accessories with 68 screw terminals for easy connection of field I/O signals to 68-pin DAQ devices.
Shielded DAQ Cable SH68-68-EP Adjustment,
Analog Output,
Counter
Use with NI 671x/672x/673x modules with a 68-pin SCSI II connector.
SH68-C68-S Use with PXI-6722/6723.
Chassis* PXI-1042, PXI-1042Q Use with PXI modules.
* During calibration, PCI devices must be connected directly to the computer. PCI devices should be tested without using any PCI extender systems.

NoteNote   The Calibration Executive procedure runs in automated mode if you use IVI-supported calibration standards.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 671x/672x/673x meets published specifications.

  • Keep connections to the module short. Long cables and wires act as antennas, picking up extra noise, which can affect measurements.
  • Use shielded copper wire for all cable connections to the module.
  • Use twisted-pair wire to eliminate noise and thermal offsets.
  • Maintain a temperature between 18 and 28 °C. To operate the module at a specific temperature outside this range, calibrate the device at that temperature.
  • Keep relative humidity below 80%.
  • Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry is at a stable operating temperature.
  • (PXI) Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters are clean, and that the empty slots contain filler panels.

Device Setup

To set up the module for calibration, complete the following steps:

  1. Install the module in the chassis or host computer.
  2. Configure the hardware with MAX. Refer to the help files within MAX or visit ni.com/support for more configuration information.
  3. Launch the Calibration Executive procedure and complete the setup wizard.
  4. Connect the module and the standards following the instructions provided by Calibration Executive.
  5. When the Calibration Executive procedure prompts you to enter the device name, enter the NI-DAQmx device number assigned to the NI 671x/672x/673x device by MAX when you configured the hardware.
NoteNote  If the device fails after calibration, refer to the Troubleshooting Guidelines section. If the device still fails after you complete the troubleshooting procedures, return it to NI for repair or replacement.

Troubleshooting Guidelines

This section describes common problems you might encounter when calibrating an NI 671x/672x/673x device and explains how to correct the problem.

If the device is not recognized by MAX, verify that you followed the configuration guidelines. Additional configuration information is available at ni.com/support. If MAX fails to recognize the device after you reconfigure and refresh (<F5>), contact NI technical support.

If the device fails after calibration, complete the following steps:

  1. Check the connections and run the Calibration Executive procedure again.
  2. If the calibration still fails, try generating the failed Test Points using the test panel in MAX. For example, if the analog output (AO) failed at 9.99 V on channel 1, complete the following steps:
    1. Launch the test panel in MAX.
    2. Click the Analog Output tab.
    3. Select channel 1 from the Channel Selection pull-down menu.
    4. Set the DC voltage to 9.99 V.
    5. Click Update Channel.
    6. Read the value from the DMM.

If the reading from the DMM still fails after you complete steps 1 and 2, contact NI for repair or replacement. If the reading passes, you can change the calibration report to indicate the passing value.

NoteNote   If you have Microsoft Access 2000 or later, you can also modify the database containing the test results. The default installation directory of this database is Program Files\National Instruments\Calibration Executive\Databases\Calibration Reports.mdb.

Test Limit Equations

The following test limits are derived from the published specifications.

Voltage

TestLimits = TestValue M [abs ( TestValue ) * % of reading + Offset]

Frequency

TestLimits = TestValue M [abs ( TestValue ) * 0.01%]

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