140
Spectrum type
Select
, the vertical axis reads V or A; select
, the vertical axis reads dB. When the spectrum is linear,
the waveform is shown in Figure 9-4.
Figure 9-4 Spectrum Amplitude as V-Hz
Adjust FFT waveforms
Waveform position
⚫
Select math channel as the current channel. After touching math waveform on the screen with one finger,
adjust the waveform display position by dragging upward and downward, leftward and rightward, or tap
the fine adjustment button in the lower left corner of the screen for fine adjustment
⚫
Move the channel horizontally, tap
, tap the "time base" item, and move the leftmost (0Hz) of
the waveform to the horizontal center of the screen.
Horizontal time base scale
Select math channel as the current channel, tap the time base adjustment button, and adjust the horizontal time base
scale. The horizontal time base is stepped in 1-2-5, and the waveform changes either.
For FFT measurement, the reading of the horizontal axis changes from time to frequency (Hz), and it no longer
shares the same time base with other analog channels. Therefore, before adjusting the horizontal frequency scale,
the math channel must be set as the current channel.
Vertical sensitivity
Tap
or
on the right side of the screen to set the vertical sensitivity (V/div or dB/div) for the channel so
that waveform is displayed on the screen at an appropriate size. The vertical sensitivity factor is stepped in 1-2-5
Summary of Contents for ATO1000 Series
Page 1: ......
Page 2: ...Version Info Version Date Remarks V1 0 2020 06 ...
Page 52: ...Chapter 3 Automotive Test 49 Figure 3 30 Electronic fuel pump test ...
Page 71: ...68 Figure 3 49 K line test ...
Page 79: ...76 Figure 3 57 Mazda 6 Cylinder internal pressure measurement ...
