A test and measurement system including an electro-optical accessory with an electro-optical sensor configured to output a modulated output signal, a device under test connected to the electro-optical accessory with a variable input signal, and a processor. The electro-optical accessory includes two sets of electrodes in which a sensitivity of the first set of electrodes is different from a sensitivity of the second set of electrodes. The processor in the test and measurement system is configured to modify the modulated output signal from the electro-optical voltage accessory to reconstruct the variable input signal of the electro-optical voltage accessory that exceeds the linear input range of the optical sensor.