
on the D i s p l a y is not updated u n t i l ! the new
measurement cycle is completed.
Even if decimal point place and leading zeroes
are corrected, and a new measurement value
then appears on the L E D display, it may be
inaccurate due to display delay. Please keep it
in mind.
6 - 3
Duty cycle measurement mode
The duty cycles of digit signals can be meas-
ured by placing the counter in the time inter-
v a l measurement mode.
The duty cycle can be measured by specifying
the t w o edges (negative-going edge and positive-
going edge) of the t w o signals on channels A
and B . Select the positive-going edge (leading
edge of T 1 ) of the signal on channel A while
select the negative-going edge ( t a i l i n g edge of T 1 )
of the signal on channel B .
The duty cycle measurement mode can s t a r t when
the positive-going edge of the channel-A signal is
detected and then ends when the negative-going
edge of the channel-B signal is detected.
Use (+) slope f o r the C H A N N E L A selection
while ( - ) slope f o r the C H A N N E L B selection.
See F i g u r e 5.
Next, the period (place the counter in the period
measurement mode t h a t is to be discussed next)
should be measured. The measurement period
d a t a w i l l be used in the f o l l o w i n g expression to
calculate the duty cycle.
D u t y cycle = T V c y c l e x 100%
Figure 5 D u t y cycle measurement
35
Cycle •
Содержание FC-757
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