A transistor region of a first semiconductor layer and a capacitor region in the first semiconductor layer are isolated. The position sensing detector has a photo-response non-uniformity of less than 2% and a position detection error of less than 10 \u03bcm across the active area. The detector optics assembly comprises a field-free tube, asymmetrical with respect to the electron optical axis; the asymmetry can be introduced by offsetting the field-free tube from the electron optical axis or by chamfering the end of the tube. The pendulum bracket and thus, the sight ring, may be stabilized by operation of a stabilizing pin and supported in a limited pivoting configuration with respect to the frame, by means of a pendulum bracket support. A safe end state is assured even if the system reset signal on an input pin of the electronic device is logically disconnected from the internal reset connection to the core logic, as often occurs in boundary-scan and related testing. A second voltage is measured across the second resistor.