6. Oscilloscope Function
6. Oscilloscope Function
Dual waveform computation
Displays a waveform with CH A and CH B. CH A+CH B, CH A-CH B, CH B-
CH A added or subtracted.
6 - 9.
MATH
(Model 820 is not available)
Enter and press key.
OFF :
erase all data or math
DWM :
indicates Dual Waveform computation
FFT :
indicates Fast Fourier Transform of CH A, CH B
CH A / CH B waveforms viewed on the screen can be calculated to produce a
new waveform through the math operations and displayed on the screen in real
time.
Note.
When CH A/CH B waveform and MATH waveform overlap making observation
difficult, the MATH waveform vertical position(OFFFSET) can be adjusted by
rotating the ENCODER knob when the MATH menu open.
Note.
The source for dual waveform computation are CH A and CH B respectively. When
the vertical scale differ, the MATH waveform vertical scale will automatically be set
to the higher sensitivity vertical scale.
MATH waveform vertical scale factor
FFT
(Fast Fourier Transform)(model 840, 860 only)
Calculates and updates the FFT to determine the properties of the signal
frequency on the screen in real time.
- Source : CH A/CH B
FFT waveform Horizontal Unit
- Vertical axis : 1dB/2dB/5dB/10dB when perform FFT, set div of voltage(Y-
axis) FFT waveform is displayed depend on dB setting.
- Window : Rectangular/Hamming/Hanning/Blackman-harris. Select type
of Window to perform FFT. Each Window has different
Frequency, AMP characteristics.
Math
Dual waveform math(+,
─
) and FFT support. Math function supports Dual wave
form math such as(+), (
─
) and 4 windows in FFT such as Rectangular,
Hamming, Hanning and Blackman-Harris.
44
Hand-held Digital Oscilloscope Meter
45