HP 8590 E-Series User Manual page 336

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.
the ratio of the 60 dB bandwidth to the 3 dB bandwidth for a given resolution filter
Bandwidth selectivity tells us how steep the filter 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.
broadband response
A signal whose spectrum is wider than the resolution bandwidth of a spectrum analyzer,
and whose repetition frequency is lower than the bandwidth of the spectrum analyzer.
Notice that it is a combination of signal and receiver characteristics that determines when
a signal is classified as broadband. For refining incoming signal responses, select narrower
spans and bandwidths. Refer also to narrowband response.The following checks can help
verify whether or not the response is broadband:
Change the resolution bandwidth. The displayed amplitude should change.
n
change the sweep time.
independent of frequency span.
resolution bandwidth, the displayed amplitude of the responses should decrease.
card reader
See memory card.
channel power
A measure of the total mean power contained within a specified bandwidth. The measured
power is the combination of all discrete signals, modulation, and noise within the
bandwidth.
character set
The set of elementary symbols. These normally include both alpha and numeric codes,
plus punctuation or any other symbol which may be read, stored, or written and used for
organization, control, or representation of data.
CISPR
The acronym for the Comite International Special des Perturbations Radio-electriques
(International Special Committee on Radio Interference) or the International Commercial
EMC Advisory Committee.
Glossary-2
It is
(IF).