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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 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.
attenuation
A general term used to denote a decrease of signal magnitude in
transmission from one point to another. Attenuation may be expressed as
a scalar ratio of the input to the output magnitude in decibels.
bandwidth selectivity
This is a measure of the analyzer’s ability to resolve signals unequal in
amplitude. It is the ratio of the 60
dB
bandwidth to the 3
dB
bandwidth
for a given resolution filter (IF’). Bandwidth selectivity tells us how steep
the Iilter skirts are. Bandwidth selectivity is sometimes called shape
factor.
battery-backed RAM
Random access memory (RAM) data retained by a battery. RAM memory
cards can contain data that is maintained with a battery. Refer also to
nonvolatile memory.
blank mode
This is an analyzer function that stores any active trace in the analyzer’s
reserved memory, and blanks the display. The stored trace may be either
A, B, or C.
Glossary-3