One may wish to generate compact RC ladder models describing the measured transients in SPICE format. For this purpose using MicReD’s THERMODEL program is recommended. THERMODEL can also be used to create HTML files that document the major measurement results as well as the generated RC ladder model(s).
Select the Invoke THERMODEL item of the Evaluation menu if you wish to post-process the measured transients with the THERMODEL program. Before actually invoking THERMODEL, the channel is to be selected, for which model generation is requested (Figure 5-18): press the radio button at the corresponding channel number.
The T3Ster software prepares all necessary files for an easy usage of THERMODEL in a folder specified by the user. If THERMODEL is installed and licensed, its user interface will be started. For details using THERMODEL refer to the THERMODEL Users’ Manual.
Basically, model generation is immediately performed with the default settings for THERMODEL, by pressing the RUN button in the Identification panel of THERMODEL. THERMODEL results are shown in Figure 5-19 and in Figure 5-20.
Note, that the implementations of the NID method in the T3Ster software and in THERMODEL are different. In the T3Ster software Bayes-iteration is used for the deconvolution while in THERMODEL this step is performed by Fourier inverse filtering. That is why – due to the different features of these algorithms – the same type of functions (such as e.g. time-constant spectra or structure functions) calculated by the different programs may show minor differences.
Figure 5-18: Selecting the transient curve of a channel for post-processing
by the THERMODEL program
Figure 5-19: Generated compact thermal model for the transfer function measured
on channel 2: Twin Cauer-ladder model together with the measured response and
the response of the generated model in THERMODEL and the response in the T3Ster
software (in the background)
Figure 5-20: Compact dynamic RC model generated by THERMODEL