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•
Zoom indicates that the measurement range is within the zoomed time base
region.
To use "Zoom", first enable the
Horizontal System
(
Label
It is used to set the label for the math operation results. For setting methods, refer to
descriptions in
Grid
For setting methods, refer to the descriptions in
Parameter Setting
•
When the operator is "Intg", click or tap the Offset input field and use the pop-
up numeric keypad to set the DC offset calibration factor of the input signal. You
can also use the corresponding multipurpose knob to set the value.
•
When the operator is "Diff", click or tap Smooth input field and use the pop-up
numeric keypad to set the number of smooth times for the differential
operation. You can also use the corresponding multipurpose knob to set the
value.
9.3
FFT Operation
FFT (Fast Fourier Transform) is used to transform time-domain signals to frequency-
domain components (frequency spectrum). This oscilloscope provides FFT operation
function which enables you to observe the time-domain waveform and spectrum of
the signal at the same time. FFT operation can facilitate the following works:
•
Measure harmonic components and distortion in the system;
•
Display the characteristics of the noise in DC power;
•
Analyze vibration.
In the Math menu, click or tap the Operator drop-down button to select FFT to
access the menu as shown in
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Zoom Mode (Delayed Sweep)
).
To Turn the Channel Label Display On/Off
Figure 9.7
in the Horizontal menu
.
To Set the Screen Grid
.
Math Operation
.
HDO4000 User Guide
135
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