Analog+ Display Mode - HP 8590 E-Series User Manual

Glossary
absolute amplitude accuracy
The degree of correctness or uncertainty (expressed in either volts or dB power). It includes
relative uncertainties plus calibrator uncertainty. For improved accuracy, some spectrum
analyzers specify frequency response relative to the calibrator as well as relative to the
midpoint between peak-to-peak extremes. Refer also to relative amplitude accuracy.
active function readout
The area of a display screen where the active function and its state are displayed.
The active function is the one that was completed by the last key selection or
remote-programming command.
active marker
The marker on a trace that can be repositioned by front-panel controls or programming
commands.
active trace
The trace (commonly A, B, or C) that is being swept (updated) with incoming signal
information.
adjacent channel power
The measure of transmitter signal leakage into adjacent channels. The measured value is
usually expressed as the ratio of the power in the adjacent channel to the channel power.
amplitude accuracy
The general uncertainty of a spectrum analyzer amplitude measurement, whether relative
or absolute.
analog + display mode
A display mode of the HP 8590 Series Spectrum Analyzers that digitally simulates an analog
display. The spectrum analyzer takes several samples of the signal amplitude at each
horizontal point as it sweeps across the screen. The samples are displayed as individual dots
on the screen that are not connected. This analog-like trace data is available along with
the normal digital display features like hard copy output, screen annotation and titles, and
complete marker functions.
analog display
A display where the trace data is generated by deflecting the electron beam to match the
signal amplitude as it sweeps across the screen. The refresh rate of the trace data is equal
to the spectrum analyzer sweep rate. Refer also to CRT persistence.
ASCII
The acronym for American Standard Code for Information Interchange. It is an eight-part
code (7 bits plus parity check) used for data (information) interchange. An ASCII value is
a specific combination of bits ranging from 0 to 255 that represent characters in machine
language that computers and controllers can understand.
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