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J
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l
l
J
J
l
r
100····
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....
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....
9a-\-+-
A__)
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~
1
•
.._~,......_-+-~---11
't..
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..
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(1738-15)
2037-15
Fig. 15. DM44
timing
check.
External Horizontal Gain Check
(If
X-Y
operation
is
to
be used.) Use
~teps
1through3
of
the Basic Oscilloscope Displays procedure
for
obtaining a
Normal
Sweep Display
of
the
calibrator
square-wave
voltage waveform; then, set the
TIME/DIV
switch
to
X-Y.
With the
calibrator
signal connected to the CH 1
OR
X
input
connector and the
CH
1 VOL
TS/DIV
switch set to
50
mV,
the crt display
should
be
two
dots separated
horizontally by 5.75 to 6.25 divisions.
PEAK-TO-PEAK VOLTAGE
MEASUREMENTS-AC
Obtain a Normal Display. Make sure the VAR
VOL TS/DIV
control
is
in
the
calibrated detent. Vertically
position the display so the
lower
portion
coincides
with
a
horizontal graticule line (see Fig. 16,
Point
A).
Horizontally
position the display so one
of
the
upper
peaks coincides
with
the center vertical
graticule
line (see Fig.
16,
Point B).
Measure the vertical deflection from peak-to-peak (Point
A
to
Point B).
NOTE
If
the amplitude measurement
is
critical
or
if
the
trace
is
thick
as
a result
of
hum
and/or
noise on the
signal.
a more accurate
measurement
can be
ob-
tained
by
measuring from the
top
of
a peak to the top
of
a valley. This
will
subtract
the trace thickness from
the measurement.
@
466/464 DM44 Operators
35
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