EXAMPLE: The VOL TS-mA/DIV control is set to 1 and
the vertical deflection of the signal is 5 divisions.
Su bsti tuti ng:
1 x 1.5 x 5 = 7.5 V
ARBITRARY HORIZONTAL DEFLECTION FACTOR.
The desired signal time to be measured may not be an exact
number of divisions. If the measurement is repetitious (e.g.
on an assembly-I ine test), it is possible to obtain more accu
rate, easily-read measurements if the SEC/DIV control and
the HORIZ MGF VAR control are adjusted to set the de
sired signal timing to an exact number of divisions.
To establish an arbitrary horizontal deflection factor, con
nect a known time-duration reference signal and adjust the
SEC/DIV and HORIZ MGF VAR controls for the desired
horizontal deflection. Be careful not to move the HORIZ
MGF VAR control after this setting.
Determine the horizontal conversion factor using the formu
la:
Horizontal
Conversion
Factor
reference signal time-duration
horizontal
deflection
(divisions)
x SEC/DIV
setting
EXAMPLE: The reference signal time-duration is 2.19 ms
(455 Hz) with the SEC/DIV control set to .2 m, and the
HORIZ MGF VAR control adjusted to provide a horizontal
deflection of 8 divisions.
Substituting:
2.19 ms
8
X
.2 m
1.37
To measure the unknown signal, set the SEC/DIV control to
provide sufficient horizontal deflection to make an accurate
measurement. Do not readjust the HOR I Z MG F VAR control.
Measure the horizontal deflection in divisions and calculate
the time-duration of the unknown signal using the following
formula:
Time-Duration
SEC/DIV
setting
X
horizontal
conversion
factor
horizontal
x deflection
(divisions)
EXAMPLE: The SEC/DIV control is set to 50 µ and the
horizontal deflection is 7 divisions.
Substituting:
50 µ
X
1.37
X
7
479.5 µs
Frequency can be obtained by computing the reciprocal of
the time-duration.
@
213 Operators
25
Summary of Contents for 200 Series
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