Stanford Research Systems SR780, Руководство по эксплуатации и программированию

Страница: 179 / 497

Keypad 3-33
SR780 Network Signal Analyzer
[Auto Range Ch2]
[Auto Range Ch2] toggles Channel 2 Input Ranging between Manual and Auto. In
Manual Ranging, the Input Range is set within the [Input] menu. In Auto Ranging, the
Input Range is adjusted automatically according to the Ch2 AutoRange Mode (also in the
[Input] menu). In Normal Auto Range, only overloads cause the range to change. In
Tracking Auto Range, the Input Range moves up for overloads and down when the signal
falls below half scale.
In Swept Sine group, Auto Range is always tracking.
The Ch2 Input Range indicator at the top of the screen will be shown in inverse if Ch2 is
Auto Ranging.
Auto Range responds to all frequencies present at the input (except those attenuated by
AC coupling), not just those within the measurement span.
[Link] [Auto Range Ch2] toggles the Input Ranging of both channels.
Command: A2RG (?) {i}
[Span Up]
In FFT group, [Span Up] increases the FFT frequency Span of both displays by a factor
of 2. This provides a way of adjusting the spans regardless of which menu is displayed.
The Span is adjusted with either a fixed start, Center or End frequency depending upon
which frequency was most recently anchored in the [Frequency] menu.
In Octave group, [Span Up] moves the octave measurement span of both displays up by
an octave.
[Span Up] affects each display independently if their frequency parameters are unlinked.
[Span Up] has no affect for Swept Sine measurements.
[Link] [Span Up] is the same as [Span Up].
Command: FSPN (?) d {, i}
[Span Down]
In FFT group, [Span Down] decreases the FFT frequency Span of both displays by a
factor of 2. This provides a way of adjusting the spans regardless of which menu is
displayed. The Span is adjusted with either a fixed Start, Center or End frequency
depending upon which frequency was most recently anchored in the [Frequency] menu.
In Octave group, [Span Down] moves the octave measurement span of both displays
down by an octave.
[Span Down] affects each display independently if their frequency parameters are
unlinked.
[Span Down] has no affect for Swept Sine measurements.