8 2.07 2 7.2 10 21.5 16.4 2.28 2.2 8.1 11 pF VR = 1 V, f = 1 MHz VR = 2 V, f = 1 MHz VR = 25 V, f = 1 MHz VR = 28 V, f = 1 MHz Capacitance ratio CT2/C T25 CT1/C T28 ∆CT/C T 6.3 9 - VR = 2 V, VR .