Self-Calibrating the PXIe-4145 in MAX

Self-calibration adjusts the PXIe-4145 for variations in the module environment. The PXIe-4145 modules are externally calibrated at the factory, however you should perform a complete self-calibration after you install the module.

  1. Install the PXIe-4145 and let it warm up for the recommended warm-up time listed in the PXIe-4145 Specifications.
    Note Warm up begins when the PXI chassis has been powered on and the operating system has completely loaded.
  2. (Optional) Set properties to save the self-calibration data to the EEPROM.
    Note By default, the corrections determined by self-calibration remain in memory until the driver is unloaded or the device is reset or shut down. If you want your self-calibration data to survive power cycling and device resetting, set the niDCPower Self Calibration Persistence property to Write to EEPROM or the NIDCPOWER_ATTR_SELF_CALIBRATION_PERSISTENCE attribute to NIDCPOWER_ATTR_VAL_WRITE_TO_EEPROM prior to performing self-calibration. This setting saves the calibration data to the onboard EEPROM. Because EEPROM has a limited life, NI recommends that you save your self-calibration data to EEPROM no more than once per day.
  3. Self-calibrate the PXIe-4145 by clicking the Self-Calibrate button in MAX or calling niDCPower Cal Self Calibrate (niDCPower_CalSelfCalibrate).
    Note Low energy transients can appear at the output terminals of your PXIe-4145 during certain situations, such as power-up, power-down, device driver loading, and self-calibration. Additionally in these situations, the output is pulled to ground through a 10 kΩ resistor.

    The energy of the transients is typically less than 1 µJ, which is not enough to cause damage to most loads. However, some extremely sensitive devices could be affected. Additionally, the presence of the 10 kΩ pulldown to ground could pose a problem for some loads. If you suspect your load could be affected, NI recommends that you disconnect all power supplies and SMU connections while performing any of the above operations. To avoid transients caused by a power failure, consider employing an uninterruptible power supply system.