6-84 Chapter6
Front-Panel Key Reference
Sweep
Sweep Cont
Single
Switches the analyzer between the continuous-sweep mode and the
single-sweep mode. Pressing
Sweep (Single) puts the analyzer in
single-sweep mode. Press
Single on the front panel, to enable a sweep
when in single-sweep mode. When
Sweep (Cont) is selected, one sweep
follows another as soon as it is triggered. Pressing
Preset, or turning the
power on, selects continuous sweep.
Swp Coupling
SR SA
Selects stimulus-response (SR) or spectrum-analyzer (SA) auto-coupled
sweep times. In stimulus-response mode, auto-coupled sweep times are
usually much faster for swept-response measurements.
Stimulus-response auto-coupled sweep times are typically valid in
stimulus-response measurements when the system’s frequency span is
less than 20 times the bandwidth of the device under test.
Gate On Off Requires Option 1D6 (Time Gate). Turns the gate function on and off.
When set to
Gate (On), the video signal that is digitized is controlled by
the gate circuitry. The gate circuitry switches between two states. When
the gate is “open”, the normal video signal of the analyzer is passed
through the video filters to the peak detectors and digitizer of the
analyzer. When the gate is “closed”, the video filters, peak detectors,
and digitizer are given a signal at the bottom of the display.
The gate function requires that a gate trigger signal be connected to the
GATE TRIG/EXT TRIG IN (TTL) input on the rear panel. When the gate
function is on, the state of the gate appears at the
GATE/HI SWP OUT
(TTL) rear panel connector. A TTL high output indicates that the gate is
open. The gate out signal is only valid while the analyzer is sweeping.
Between sweeps, the gate out signal is invalid. You can adjust the gate
delay and gate length using an oscilloscope to view the gate out signal.
The analyzer sweep time should be set to a large value (50 sec) during
the adjustment so that the gate signal is valid most of the time. When
the adjustment is done you can set the analyzer back to the desired
sweep time, or set it back to
Auto Couple.
NOTE This function is not available when Trig Delay (On) is selected.
Gate Setup Requires Option 1D6 (Time Gate). Accesses the following menu keys
that allow you to setup various gate parameters:
Trig Type
Edge Level Allows you to select between Edge and Level triggering
of the gate.
Trig Type (Edge) opens the gate in response
to an edge trigger on the trigger input after a delay set
in
Gate Delay. The gate stays open for the selected Gate
Length. When Trig Type (Level) is selected, the gate is
open as long as the trigger input is true, as defined
under the
Level Setup key. Key Access: Sweep, Gate
Setup
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