I am not familiar with QTM or Geratherm systems but if they provide analog output signals, you can use an independent A/D acquisition system (along with a computer) to collect these signals. In doing so, the signals will be synchronized. Alternatively, if either the QTM or Geratherm system has an analog input channel and the other an analog output signal, the output signal can be fed into the system with the analog input channel. There are other possibilities but I would need more details (e.g., desired sampling rates and durations).