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6-4
Relationship between period measurement mode
and
time interval mode
It is strongly recommended t h a t the period meas-
urement mode be used instead of the time in-
t e r v a l measurement mode to measure the time
interval between t w o s i m i l a r edges of the same
signal ( f o r example, the time interval between
one positive-going edge and the next
edge of the same signal is measured.).
The reasons are as f o l l o w s :
- If fine resolution is selected, the period measure-
ment mode outputs higher precision measurement
d a t a than the time interval measurement mode
does. In the time interval measurement mode,
as the number of time i n t e r v a l s ( 1 , 10, 100, and
1000)
increases, the error rate w i l l
and
bigger accordingly. A s a result,
ed output values may be displayed more often
because the better resolution requires more dis-
play digits for more accurate measurement is
not assured.
The period
measurement mode produces the same
measurement error, irrespective of
settings.
36
6 - 5
positive-going
be bigger
jitter-affect-
resolution
Use of T R I G
L E V E L
control
T R I G
L E V E L
control
®
the trigger
levels of the input signals to
C H A N N E L A .
If the adjust is pressed (set to
the P R E S E T position), almost the average level
of the input signals is selected as the
level.
A l m o s t the a l l the operations can be
performed based on t h a t
this level should be changed if the signal
w a v e f o r m s shown in figure 6 are processed.
The trigger
level to be selected by setting the
controller to the P R E S E T position
by the broken line a t the bottom in the Figure.
T h i s trigger
level is an average of the pulse
s t r i n g .
However, this level nears the noise found
in the signal w a v e f o r m .
cause a pseudo trigger
error.
T o change the triggering
trigger error, use the T R I G
If the controller
is pulled and rotated in either
direction (clockwise or counterclockwise), the
current level position moves to either a desired
earlier position or later position.
is provided to adjust
trigger
trigger
level.
However,
is indicated
A s a result, it m a y
position to prevent the
L E V E L
control.
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