5
.Menu Interpretation
32
modulated signal) at time domain.
5.2.4 [Last Span]
Changes the span to the previous span setting.
5.3
【
AMPTD
】
bottom softkey
Key access: [AMPTD] softkey at the bottom of the screen
Sets the amplitude parameters of the analyzer. Through these
parameters, signals under measurement can be displayed at an
optimal view with minimum error. The amplitude submenu
includes [Ref Level], [Attenuation Auto Manual], [
Scale/Div
],
[Scale Type Lin Log], [Ref Offset], [Ref Unit], and [Preamplifier
On Off].
5.3.1 [Ref Level]
Activate reference level function and sets the maximum power or
voltage for display window.
Key points:
This value is affected by a combination of maximum mixing level,
input attenuation, and preamplifier. When you adjust it, the input
attenuation is adjusted under a constant max mixing level,
meeting:
L
Ref
−
a
RF
+
a
PA
≤
L
mix
(5-3)
L
Ref
,
a
RF
,
a
PA
and
L
mix
denotes the reference level, the input
attenuation, the preamplifier, and the max mixing level,
respectively.
You can modify this parameter using the numeric keys, knob, or
direction keys.
