What procedure would you use to verify experimentally that there is no gate current in the range over which a JFET can operate?

To verify that there is no gate current in a Junction Field-Effect Transistor (JFET), one can set up a simple circuit where a JFET is connected with a high-impedance ammeter in series with the gate terminal. By applying a range of gate-source voltages (Vgs) and measuring the current, one should observe that the ammeter reads zero across the entire operational range, confirming that the gate current is negligible. Additionally, this can be reinforced by using an oscilloscope to monitor any transient signals at the gate, further validating the absence of gate current.