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residual FM
The inherent short-term frequency instability of an oscillator in the
absence of any other modulation. In the case of analyzers, we usually
expand the definition to include the case where the local oscillator is
swept. Residual FM is usually specified in peak-to-peak values, because
they are most easily measured on the display, if they are visible at all.
residual responses
These are discrete responses seen on an analyzer display although no
input signal is applied.
resolution
Refer to frequency resolution
resolution bandwidth
The ability of an analyzer to display adjacent responses discretely
(hertz, hertz decibel down). This term is used to identify the width of
the resolution bandwidth filter of an analyzer at some level below the
minimum insertion-loss point (maximum deflection point on the display).
The 3
dB
resolution bandwidth is specified; for others, it is the 6
dB
resolution bandwidth.
rose-n-fell
For digital displays, this is the display detection mode in which the value
displayed at each point on a trace is based upon whether or not the video
signal both rose and fell during the frequency or time interval represented
by the point. If the video signal only rose or only fell, the maximum
value is displayed. If the video signal both rose and fell, the maximum
value during the interval is displayed by odd-numbered points, and the
minimum value by even-numbered points. To prevent the loss of a signal
occurring during an even-numbered interval, the maximum value of the
signal during this interval is preserved. At the next (odd-numbered)
interval, the value displayed is the greater value carried over, or the
maximum, that occurs during the current interval.
sample
The instantaneous value of an incoming signal. On digital displays, each
displayed point of the signal indicates the instantaneous value of the
signal for that part of the frequency span or time interval represented by
the point.
Glossary-22