Applications
Time Ratio
The Delta Time
(~t)
function also can measure the percent ratio between
two
different time intervals, such as the period and width of a pulse, which define duty
factor.
1.
Display the signal with SEC/DIV and VAR set for one cycle over exactly
five horizontal divisions.
2.
Activate
~t
and align the two vertical cursors with the beginning and end
of
the high portion
of
the pulse. Measure the low portion
of
the pulse if you
want
to
measure the portion
of
the cycle that
is
low (see Figure 3-5).
If the portion
of
the pulse you are measuring is less than 1 division wide (20%),
you can improve the accuracy of the measurement. Activate the
X1
0 MAG, without
changing
SEC/DIV or VAR, and align the cursors with the magnified pulse. The
RATIO reading will be 10 times the actual ratio.
The
CRT readout displays the
ratiO,
in
percent, between the separation
of
the
two cursors and the five-division reference
interval. When the two cursors are
separated by five divisions, the readout indicates
100%.
3-10
TIME
RATIO
L
-
A1
0.0
V
RATIO
32.9%
REF
C
t-dJ
','
V
ERENCE
URSOR
"
I
'r'
2V
I
J.1
'T
DELTA
CURSOR
I
I
I
"1'
20.1/-1s
I
REFERENCE
I
-INTERVAL_
(5
DIVISIONS)
TEST
~SIGNAL
(3832-18) 5854-16
Figure 3-5. Time ratio (duty factor).
2465A/2455A/2445A Operators
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