HP 8591C User Manual page 347

The 3 dB resolution bandwidth is speciEed; for others, it is the 6 dB
resolution bandwidth.
RS-232
A means of communication between devices, such as printers, plotters,
computers, modems, and analyzers. (The devices need to have RS-232
interfaces). Unlike the HP-IB interface bus, the RS-232 interface bus is
used for serial (not parallel) transmission.
scale factor
The per-division calibration of the vertical axis of the display.
scrambled
To alter an electronic signal so that a decoding device is necessary to
receive the signal.
shape factor
Refer to bandwidth selectivity.
single-sweep mode
The analyzer sweeps once when trigger conditions are met. Each sweep
is initiated by pressing an appropriate front-panel key, or by sending a
programming command.
Key labels displayed on a screen or monitor that are activated by
mechanical keys surrounding the display or located on a keyboard.
software. Front-panel key selections determine which menu (set of
softkeys) appears on the display.
span
Span equals the stop frequency minus the start frequency. The span
setting determines the horizontal-axis scale of the analyzer display.
span accuracy
The uncertainty of the indicated frequency separation of any two signals
on the display.
spectrum analyzer
A device that effectively performs a Fourier transform and displays the
individual spectral components (sine waves) that constitute a time-domain
signal.
Glossary- 14