A speech-responsive command and control system and methodology for use in a signal measurement system, enabling an operator to control certain features and functions of the oscilloscope without using manual or graphical controls. The dimmer switch prevents multiple re-strikes by avoiding multiple firings of a controllably conductive switching device of the dimmer circuit by limiting the high-end light intensity of the fluorescent lamp. Each first terminal is electrically connected to fixed electrodes of microactuators equal in number to the second number. A plurality of windows are formed in the wheel disc. The method includes retrieving an indication of a translation change for a telecommunications switch from storage and placing a test call to test whether the translation change was successful.