Voltage measurement calibration methods and junction circuits. In one embodiment, the junction circuit includes a capacitor and a voltage adjustment circuit. The junction circuit is electrically coupled to an output of a capacitive voltage divider circuit. The capacitor is electrically coupled between the output of the capacitive voltage divider circuit and a reference terminal. The voltage adjustment circuit is electrically coupled between the output of the capacitive voltage divider circuit and an output of the junction circuit. The voltage adjustment circuit includes an adjustable impedance component configured to adjust a voltage gain of the voltage adjustment circuit.