Instructions

5.2.3 [Zero Span]

Sets the span of the analyzer to 0 Hz. Both the start and stop

frequencies will equal the center frequency and the horizontal axis

will denote time. The analyzer here is measuring the time domain

characteristics of amplitude, located at the corresponding

frequency point. This will help to observe the signal (especially for

modulated signal) at time domain.

5.2.4 [Last Span]

Changes the span to the previous span setting.

5.3

【

AMPTD

】

Amplitude

Sets the amplitude parameters of the analyzer. Through these

parameters, signals under measurement can be displayed at an

optimal view with minimum error. The pop out amplitude menu

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:

Ref

− a

+ a

≤

mix

(5-3)

Ref

and

denotes the reference level, the input

attenuation, the preamplifier, and the max mixing level,

respectively.