Abstract: A parent menu in the display of an electronic device includes a conditional branch key. The conditional branch key is associated with an action and a branch menu. When the conditional branch key is selected a first time, the action is performed by the electronic device and a visual characteristic of the conditional branch key is visually altered. When the conditional branch key is selected a second time, the branch menu replaces the parent menu in the display.

Abstract: A spectrum analyzer is disclosed. The analyzer includes a detector, a trace memory, a controller, a trace math processor and a display. The controller generates a plurality of frequency selection signal values and records the measured amplitudes at each of the generated frequency selection values to form a measured trace that is stored in slots in the trace memory. The trace math processor performs trace mathematical operations on traces stored in the trace memory to generate a math trace that is stored in the trace memory. The controller stores a plurality of trace math programs, each program corresponding to one of the trace storage slots in the trace memory and specifies the trace mathematical operations that are to be performed to generate a new trace to be stored in that trace storage slot. The controller executes the stored trace math program for each trace slot in a predetermined order.

Abstract: An instrument uses a marker as a passive element for indicating measurement and reference points and also uses the marker to enter data. In response to a user placing the marker on a graph and selecting a predetermined key on a keypad of the instrument, the instrument enters at least one value represented by the marker into an active table.

Abstract: A user interface for an electronic instrument includes a display that displays a signal and a band marker. The band marker demarks a bandwidth of the signal by marking both a start frequency of the bandwidth and a stop frequency of the bandwidth. The electronic instrument performs a function on the bandwidth of the signal between the start frequency and the stop frequency.