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No o o o t t t t e e e e : : : :
T T T T h h h h e e e e
d d d d i i i i f f f f f f f f e e e e r r r r e e e e n n n n c c c c e e e e
t r r r r i i i i g g g g g g g g e e e e r r r r
c c c c a a a a n n n n
i i i i d d d d e e e e n n n n t t t t i i i i f f f f y y y y
t t t t h h h h e e e e
o f f f f t t t t h h h h e e e e p p p p u u u u l l l l s s s s e e e e . . . . I I I I n n n n t t t t h h h h e e e e o o o o t t t t h h h h e e e e r r r r w w w w o o o o r r r r d d d d , , , , t t t t h h h h e e e e o o o o v v v v e e e e r r r r t t t t i i i i m m m m e e e e t t t t r r r r i i i i g g g g g g g g e e e e r r r r o o o o c c c c c c c c u u u u r r r r s s s s b b b b a a a a s s s s e e e e d d d d o o o o n n n n p p p p u u u u l l l l s s s s e e e e i i i i d d d d e e e e n n n n t t t t i i i i f f f f i i i i c c c c a a a a t t t t i i i i o o o o n n n n . . . . I I I I t t t t i s s s s s s s s i i i i m m m m i i i i l l l l a a a a r r r r t t t t o o o o t t t t h h h h e e e e > > > > m m m m o o o o d d d d e e e e o o o o f f f f t t t t h h h h e e e e p p p p u u u u l l l l s s s s e e e e w w w w i i i i d d d d t t t t h h h h t t t t r r r r i i i i g g g g g g g g e e e e r r r r , , , , b b b b u u u u t t t t n n n n o o o o t t t t t t t t h h h h e e e e s s s s a a a a m m m m e e e e . . . .
6.10 Example 10: Using Math Functions to Analyze
Waveforms
Using math functions to analyze input waveforms is another advantage of the digital oscilloscope.
For example, you want to get the instantaneous difference between two channel waveforms. By
using the math function of the oscilloscope, you can get a better representation of the waveform
on the screen. To observe this signal, follow the steps below.
1.
Set the Probe option attenuation to 10X.
2.
Open CH1 and CH2 at the same time, both with the attenuation of 10X.
3.
Push the AUTOSET button to trigger a stable waveform.
4.
Push the MATH MENU button to see the Math menu.
Push the Operation option button and select 'CH1+CH2'.
5.
6.
Turn the horizontal SEC/DIV and the vertical VOLTS/DIV knobs to properly scale the
waveform for easy check.
In addition, the oscilloscope also supports the - and FFT functions. For a detailed analysis on FFT,
refer to
Chapter 5.3.1 Math
No o o o t t t t e e e e : : : :
Y Y Y Y o o o o u u u u
s s s s h h h h o o o o u u u u l l l l d d d d
o t t t t h h h h e e e e r r r r w w w w i i i i s s s s e e e e , , , , d d d d i i i i f f f f f f f f e e e e r r r r e e e e n n n n c c c c e e e e s s s s i i i i n n n n p p p p r r r r o o o o b b b b e e e e c c c c o o o o m m m m p p p p e e e e n n n n s s s s a a a a t t t t i i i i o o o o n n n n w w w w i i i i l l l l l l l l a a a a p p p p p p p p e e e e a a a a r r r r a a a a s s s s e e e e r r r r r r r r o o o o r r r r s s s s i i i i n n n n t t t t h h h h e e e e d d d d i i i i f f f f f f f f e e e e r r r r e e e e n n n n t t t t i i i i a a a a l l l l s i i i i g g g g n n n n a a a a l l l l . . . .
As illustrated in the above figure, input a 1KHz sine wave from CH1 and a 1KHz square wave from
DS2002A Series Digital Storage Oscilloscope User Manual
b b b b e e e e t t t t w w w w e e e e e e e e n n n n
t t t t h h h h e e e e
o o o o v v v v e e e e r r r r t t t t i i i i m m m m e e e e
p p p p u u u u l l l l s s s s e e e e
y y y y o o o o u u u u
n n n n e e e e e e e e d d d d
a a a a c c c c c c c c o o o o r r r r d d d d i i i i n n n n g g g g
FFT.
c c c c o o o o m m m m p p p p e e e e n n n n s s s s a a a a t t t t e e e e
b b b b o o o o t t t t h h h h
a a a a n n n n d d d d
t t t t h h h h e e e e
d d d d e e e e l l l l a a a a y y y y
t t t t o o o o
y y y y o o o o u u u u r r r r
s s s s e e e e t t t t
t t t t i i i i m m m m e e e e
p p p p r r r r o o o o b b b b e e e e s s s s
b b b b e e e e f f f f o o o o r r r r e e e e
p p p p e e e e r r r r f f f f o o o o r r r r m m m m i i i i n n n n g g g g
Application Examples
t t t t r r r r i i i i g g g g g g g g e e e e r r r r s s s s
i i i i s s s s
t t t t h h h h a a a a t t t t
t t t t h h h h e e e e
a a a a n n n n d d d d
t t t t r r r r i i i i g g g g g g g g e e e e r r r r
o o o o n n n n
t t t t h h h h e e e e
m m m m a a a a t t t t h h h h
o o o o v v v v e e e e r r r r t t t t i i i i m m m m e e e e
a a a a n n n n y y y y
p p p p o o o o i i i i n n n n t t t t
o o o o p p p p e e e e r r r r a a a a t t t t i i i i o o o o n n n n ; ; ; ;
58
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