Quick Tips
1. If desired, use the zoom feature to magnify the FFT waveform.
2. Use the default dBV RMS scale to see a detailed view of multiple frequencies, even if they have very
different amplitudes. Use the linear RMS scale to see an overall view of how all frequencies compare to
each other.
3. Signals that have a DC component or offset can cause incorrect FFT waveform component magnitude
values. To minimize the DC component, choose AC Coupling on the source signal.
4. To reduce random noise and aliases components in repetitive or single-shot events, set the oscilloscope
acquisition mode to average.
Term interpretation
Nyquist frequency:
The highest frequency that any Real Time Digital Oscilloscope can measure is exactly
half of the sampling rate under the condition of no mistakes, which is called Nyquist frequency. If
under-sampling occurs when the frequency sampled is higher than Nyquist frequency, “False Wave”
phenomenon will appear. So pay more attention to the relation between the frequency being sampled and
measured.
Note:
In FFT mode ,the following setting is prohibited:
1. Window set
2. change source channel in CH1 setup or CH2 setup
3. XY Format in DISPLAY SET
4. “SET 50%” (the triggering level at the vertical point of signal amplitude) in Trigger setting.
5. Autoscale
6. Wave record
Measure 1 and Measure 2
7.14. System State Menu
The system state menu is used to display information about the present horizontal system, vertical system,
trigger system and others. The operation steps are shown as below.
1. Press the
MENU
key and the function menu is displayed at the right of the screen.
2. Press the
MENU
▲
or
MENU
▼
key to select the System State. Four options appear at the bottom of the
screen.
3. Sequentially press
F1
to
F4
key and the corresponding state information will be shown on the screen.
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