Ceyear 4041 Series, User Manual

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Chapter VIII Channel Scanner Mode (Option)
108
7.3.8 Audio spectrum menu
Span
Audio Spectrum
Scale/Div
10.0dB
Ref Position
·[Span]: Press
【
Audio Spectrum
】
→[Span] to set the span of the audio spectrum. The
span set here shall be big enough to display the audio signal and related harmonics.
You can change it by using the numeric keys and selecting a frequency unit, or by
using
【 ↑ 】 【 ↓ 】
keys and the knob.
·[Scale/Div]: Press
【
Audio Spectrum
】
→[Scale/Div] to set the scale of the audio
spectrum to facilitate the observation of the audio spectrum traces. You can change the
scale unit by using the numeric keys and selecting the frequency unit [dB] or [-dB], or
by using
【 ↑ 】 【 ↓ 】
keys and the knob.
·[Ref Position]: Press
【
Audio Spectrum
】
→[Ref Position] to set the reference position
of the audio spectrum to facilitate the observation of the audio spectrum traces. You
can change the reference position by using the numeric keys and clicking OK, or by
using
【
↑
】 【
↓
】
keys and the knob.
7.3.9 Audio waveform menu
Sweep Time
Audio Waveform
Scale/Div
20.0%
·[Sweep Time]: Press
【
Audio Waveform
】 →[Sweep Time] to set the sweep time of the
audio waveform. The measurement results are more stable if the sweep time set here is
longer and the sampling points are more.
·[Scale/Div]: Press
【
Audio Waveform
】
→[Scale/Div] to set the scale of the audio
waveform to facilitate the observation of the audio spectrum traces. You can change the
scale unit by using the numeric keys and then selecting [%] or clicking OK, or by using
【 ↑ 】 【 ↓ 】
keys and the knob.
·[Special Attention]: The scale unit changes with the change of types of
demodulation signals. When the AM signal is measured, the scale unit is
percentage (%). When the FM signal is measured, the scale unit is frequency unit
(Hz, kHz or GHz). When the PM signal is measured, the scale unit is radian
(Rad).