l
l
J
J
display
is at the B sweep rate. The start
of
the B sweep rate
portion
can be changed
by
adjusting the DELAY
TIME
POSITION
control.
4.
If
your
instrument
is equipped with a DM44, mixed
sweep
displays
of
two
signals can be obtained at the same
time.
The
DM44
will
indicate the time difference between
the
beginning
of
the
B sweep
portions
of
the
two
displays.
To
obtain
two
mixed sweep displays set
the
FUNCTION
switch
to
TIME
and the VERT
MODE
switch
to
ALT.
The
DELAY
TIME
POSITION
control
positions
both
mixed
displays.
The
fl.
TIME
control
positions
only
the CH 2
mixed
display.
X-Y DISPLAY
1.
Preset the
instrument
controls
as
given in step 1
of
Normal
Sweep Display, then turn the
instrument
power
on.
Allow
several minutes
for
instrument
warm-up.
2.
Set the
TIME/DIV
switches
to
X-Y and
the
VERT
MODE
switch
to
CH
2.
Apply
the vertical signal to the
CH
2 OR Y
input
connector
and the horizontal signal to
the
CH
1 OR X
input
connector.
3.
Advance
the
INTENSITY
control
until
the
display
is
visible. If
the
display
is
not visible
with
the INTENSITY
control
at midrange, press the BEAM FINDER pushbutton
and adjust the CH 1 and CH 2 VOL
TS/DIV
switches until
the display
is
reduced in size, both vertically and
horizon-
tally. Center the compressed
display
with
the POSITION
controls (CH 2 POSITION vertically, Horizontal ·
POSITION horizontally); release the BEAM FINDER
pushbutton. Adjust the FOCUS
control
for
a well-defined
display.
SINGLE SWEEP DISPLAY
1.
Obtain a Normal Sweep Display. For random
signals, set the
trigger
circuit
to
trigger
on a signal that
is
approximately the same
amplitude
and
frequency
as
the
random signal.
2.
Push the SINGL SWP
button
on the A TRIG
MODE
switch. The next trigger pulse starts the sweep and
displays a single trace. If
no
triggers are present, the
READY lamp lights, indicating the A Sweep Generator
circuit
is
set and waiting
to
be triggered.
3.
After the sweep
is
complete, the
circuit
is
"locked
out"
and the READY lamp is out. Press the
SINGL
SWP
button
to prepare the
circuit
for
another
single-sweep
display.
@
466/464 DM44 Operators
21
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