Can you suggest alternative procedure for the determination of Rth?

An alternative procedure for determining Rth (the Thevenin equivalent resistance) involves using the open-circuit voltage method. First, measure the open-circuit voltage (Voc) across the terminals of the circuit where Rth is to be found. Then, short the output terminals and measure the short-circuit current (Isc). Finally, Rth can be calculated using the formula Rth = Voc/Isc, providing a straightforward approach to determine the Thevenin resistance without modifying the original circuit significantly.