In this view all measured points are plotted (and after evaluation also the smoothed curve shown in the Smoothed response view). The x axis is scaled in time [sec], and is usually logarithmic. The y axis is the voltage change on the measurement channel, converted to temperature difference [°C] using a calibration factor. This scale does not refer to absolute temperature, the lower end of the measurement range is shown as 0°C.
Figure 3-5: Measured curves in a multi-chip module, in still air chamber
Figure 3‑5 shows measured transients in a multi-chip module. Components are always measured in a certain measurement environment, in this case the module was mounted on a board of given size and placed in a closed chamber.
One of the chips had been powered by 200 mW for a prolonged time, the cooling was captured after switching off the power. Channel 0 shows the cooling of the chip powered, the other channels show heat transfer towards the other chips.
Figure 3-6: Detail view of Figure 3‑5
Figure 3‑6 demonstrates the quality of the measurement.
