PXI-4132 Thermal Protections and Precautions

The PXI-4132 is protected against excessive temperatures and will shut down in the presence of excessive heat.

In the event of an overtemperature condition, NI-DCPower reports an error and disables the output of the instrument. The output relays also disconnect HI and LO from the output connector to prevent the PXI-4132 from sinking power. Once the PXI-4132 is disabled, the error condition must be cleared by resetting the instrument in order to resume normal operation.

During normal sourcing operation (up to 2 W output), the thermal protection should not engage over the rated ambient temperature range of the instrument. Also, sinking power levels within the rated specifications of the instrument should not trigger the thermal protection when the instrument is within the ambient temperature range.

Hot Surface Do not touch the outer shield of the PXI-4132 as it may become very hot during an overtemperature condition.

Thermal protection may also become engaged if the output becomes unstable because of inductive loads in the highest current range. If you are operating the PXI-4132 within the rated specifications and the thermal protection is engaging, consider whether instability may be a factor in overtemperature operation of your instrument.