282 Chapter4
Key Function Descriptions
Key Descriptions
SWEEP Activates the sweep time function and accesses a menu
of sweep-related functions, which are as follows: SWP
TIME AUTO MAN, SWEEP CONT SGL, GATE ON
OFF, GATED VIDEO, DLY SWP [ ], DLY SWP ON OFF,
GATE DLY [ ], GATE LEN [ ], EDGE POL POS NEG,
and GATE CTL EDGE LVL.
SWEEP also activates the
sweep-time function.
Front-panel key access: SWEEP
SWEEP CONT SGL Allows you to select continuous sweep or single
sweep mode. Pressing
SWEEP CONT SGL so that CONT
is underlined, activates the continuous-sweep mode.
Continuous sweep mode is the default mode. Pressing
SWEEP CONT SGL so that SGL is underlined,
activates the single-sweep mode. Press SGL SWP to
restart the sweep at the next trigger. When the
single-sweep mode is active, an S appears at the left
edge of the display.
Front-panel key access:
SWEEP or TRIG
SWP CPL SR SA Allows the user to choose a stimulus-response (SR) or
spectrum-analyzer (SA) auto-coupled sweep time. In
spectrum analyzer mode, the sweep times are coupled
so that the measurement remains calibrated. In
stimulus-response mode, auto-coupled sweep times are
usually faster for swept-response measurements.
Stimulus-response auto-coupled sweep times are
typically valid in stimulus-response measurements
when the system frequency span is less than 20 times
the bandwidth of the device under test. When a
stimulus-response sweep time is chosen, an E appears
in the special functions area at the left side of the
display screen.
Front-panel key access:
AUX CTRL
SWP TIME AUTO MAN Adjusts the sweep time of the spectrum analyzer.
To change the sweep time, use the data keys, the step
keys, or the knob. A line under MAN indicates that the
sweep time can be manually set. A line under AUTO,
indicates a coupled sweep time based on the resolution
bandwidth, span, and video bandwidth settings. When
the sweep time is in manual mode, press SWP TIME
AUTO MAN until AUTO is underlined to return the
sweep time to coupled mode.
In stimulus response, auto-coupled sweep-time mode
(SR), sweeps are usually much faster than spectrum
analyzer, auto-coupled sweep time mode (SA).
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