VOL
TS/DIV
and VAR VOL
TS/DIV
controls
so the CH 2
display
is
about
the
same
amplitude
as
the undesired
portion
of
the CH 1 display (see Fig. 19A).
3.
Set the VERT
MODE
switch
to
ADD. Slightly
readjust the CH
2 VAR VOL
TS/DIV
control
for
maximum
cancellation
of
the undesired signal
component
(see Fig.
198).
AMPLITUDE COMPARISON
MEASUREMENTS
If comparisons
of
an
unknown
signal with a reference
signal are repetitious (e.g., on an assembly line test) it
is
possible to obtain more accurate easily read
measurements if
the
VAR VOL
TS/DIV
control is adjusted
to
set the reference signal
to
an exact
number
of
divisions.
The
unknown
signal can then be
quickly
and easily
compared with
or
adjusted to an exact
number
of
divisions.
Other
unknown
signals may be measured
without
disturbing
the setting
of
the VAR VOL
TS/DIV
control
by
establishing a vertical conversion
factor
and
an
arbitrary
deflection factor. The
amplitude
of
the reference signal
must
be
known
before a vertical conversion factor can be
established.
Determine the vertical conversion factor using this
formula:
Vertical
Conversion
Factor
reference signal amplitude (volt)
vertical
deflection
(divisions)
VOLTS/DIV
X switch
setting
Determine the
arbitrary
deflection factor using the
formula:
Arbitrary
Deflection
Factor
Vertical
Conversion X
Factor
VOLTS/DIV
switch
setting
To
measure the
amplitude
of
an
unknown
signal, set
the
VOL
TS/DIV
switch to a setting that provides
sufficient
vertical
deflection
to
make an accurate measurement.
Do
not
readjust the VAR VOL
TS/DIV
control. Measure
the
vertical
deflection
in divisions and calculate the
amplitude
of
the
unknown
signal using the
following
formula:
Signal
Amplitude
Arbitrary
Vertical
deflection
X deflection
factor
(divisions)
40
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