PXI modules are designed to operate in a PXI or Compact PCI chassis at specified environmental conditions. Device performance and reliability might be limited at temperatures above the specified operating range. For best performance, take the following precautions:

  • Ensure that the ambient temperature is within the temperature listed in the specifications document for your module, and that the temperature is stable (±5 °C).
  • Follow standard metrology practices.
  • Use a PXI chassis with a well designed cooling system.

Operating the module outside the specified operating temperatures might have the following consequences:

  • Increase bias currents in the electronic components
  • Increase noise
  • Accelerate drifts
  • Decrease product life

Beyond the maximum specified operating temperatures, the circuits perform differently than during the factory calibration, resulting in additional measurement errors which might not be accounted for by the Tempco specifications.

To minimize the temperature rise above ambient, position the chassis away from heat sources and clean the PXI or Compact PCI chassis air filter at regular intervals. Clean air filters are essential to ensuring that the devices operate at peak performance.

Operating under high humidity or dusty conditions can cause leakages between circuit components to increase and result in additional measurement errors.

Chassis Cooling Guidelines

Follow these guidelines to optimize cooling and ensure best performance and reliability:

  • Always run chassis with fans set on high. In newer chassis the settings are HIGH and AUTO. On some older chassis the fan settings might be HI and LO.
  • Cover all empty slots in the chassis with a blank EMC slot filler panel.
  • Remove and clean the inlet filters often to prevent buildup of dust and other foreign material that might restrict airflow.
  • Locate the chassis such that the fan inlets and outlet vents are not obstructed. Keep other objects and equipment a minimum of 3 inches sway from the fan inlets.

For more information regarding cooling considerations, refer to the Specifications document of your chassis.