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Spectrum Analyzer Mode Key Descriptions
Spectrum Analyzer Mode Functions
adds an offset value to the displayed reference level. Offsets
are entered by using the number/units keypad. Entering
an offset does not affect the trace or the attenuation value.
Reference-level offsets are used when gain or loss occurs
between a device under test and the -analyzer input. Thus,
the signal level measured by the analyzer is the level at the
input of an external amplitude-conversion device. When an
amplitude offset is entered, its value is displayed on the left
side of the screen (as opposed to frequency offsets which
are displayed at the bottom of the screen). To eliminate
an offset, press
REF
LVL OFFSET , 0
C--dBmV]
or
(+dBmV].
Pressing
(j-1
also sets the offset to zero. Reference-level
offsets are entered using the numeric keypad. See
also
the
EXTERNAL PREAMPG
softkey
description.
Front-Panel Key Access
(j-1
changes the analyzer 3
dB
resolution bandwidth. As the
resolution bandwidth is decreased, the sweep time is
increased to maintain amplitude calibration. Resolution
bandwidth is also related to span. As span is decreased, the
resolution bandwidth is decreased. A
“#”
mark appears
next to RES BW on the screen to indicate that it is not
coupled. To recouple the resolution bandwidth, press
RES
BW AUTO MAN so that AUTO is underlined. The
resolution bandwidth can be changed using the step keys,
the knob, or the numeric keypad.
Front-Panel Key Access [AUTO
COUPLE]
or
m
6-122