When operating in a high-gain state, the FLIR Ax5 requires a NUCActionLong operation whenever it heats or cools through approximately 0, 40, or 65°C. For example, NUCActionLong is required if the Ax5 is powered on at –10°C and then is heated to +10°C. The NUCActionLong operation takes approximately 0.1 second longer than the normal NUCAction operation, and allows the Ax5 to automatically load calibration terms that are appropriate for the current operating temperature range.

Additionally, when switching between high-gain and low-gain modes, NUCActionLong is needed in order to load the new calibration terms required for the gain switch to complete.

Note that if NUCActionLong or NUCAction is sent while requesting a switch between high gain and low gain or vice versa, the image can become corrupted. A restart of the camera should solve the issue. Thus, avoid sending NUC commands during gain switching.