How can accurate thrust measurements be obtained for a micro gas turbine engine that is fixed to a static test bed during performance testing? I am exploring methods suitable for small-scale engines where direct force measurement is challenging due to low thrust levels. Are there preferred techniques or sensor arrangements (e.g., load cells, strain gauges, thrust stands) that provide reliable data without compromising structural integrity or introducing significant vibration errors? Insights on calibration procedures and data filtering methods for dynamic thrust output would also be appreciated.