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displayed average noise level
The noise level viewed on the analyzer’s display after narrowing the
video bandwidth setting enough to reduce the peak-to-peak noise
fluctuations. The resulting noise display is essentially a straight line.
Usually this term refers to the analyzer’s own internally generated
noise as a measure of sensitivity. It is typically specified in
dBm
under
conditions of minimum resolution bandwidth and minimum input
attenuation.
DLP
The abbreviation for downloadable program. A single programming
command or a sequence of programming commands used to perform
specific operations.
DLPs
can be made up of several functions, variables,
and traces defined by the program creator. The DLP can be downloaded
from one electronic storage medium into another and executed without a
controller.
drift
The slow (relative to sweep time) change of signal position on the display
as a result of a change in local oscillator frequency versus sweep voltage.
While analyzer drift may require periodic retuning, it does not impair
frequency resolution.
dynamic range
The power ratio
(dB)
between the smallest and largest signals
simultaneously present at the input of an analyzer that can be measured
with some degree of accuracy. Dynamic range generally refers to
measurement of distortion or intermodulation products.
EM1
The abbreviation for electromagnetic interference. An
EM1
measurement
determines how much an undesired electromagnetic disturbance impairs
the reception of a desired electromagnetic signal.
Glossary-8