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10 (A
Trigger
circuit
only}: External
trigger
signal is attenuated
by
a
factor
of
10.
STARTS
AFTER DELAY
(8
Trigger
circuit
only}: B
Sweep
runs
immediately
after the delay
time
selected
by
the
DELAY-TIME
POSITION
control.
When making
differential
time
measurements
you
must use this
mode
to
obtain
valid measurements. On
instruments
equipped
with
a DM44
you
must use this mode
to
obtain valid
measurements
when using the
TIME
or
1/TIME
functions.
43. External Trigger
Inputs-Input
connectors
for
ex-
ternal
trigger
signals.
HORIZONTAL
AND POWER
44a. A AND B
TIME/DIV
AND DELAY
TIME-A
TIME/DIV
switch
.(clear plastic skirt) selects the sweep
rate
of
the
A Sweep
circuit
for
A sweep
only
operation and
selects
the
basic delay
time
(to be used
by
the
DELAY-
TIME
POSITION
control}
for
delayed sweep operation. B
TIME/DIV
switch
(pull
out
and rotate
to
unlock}
selects the
sweep rate
for
the
B Sweep
circuit
for
delayed sweep
operation
only. A VAR
control
must be in
the
calibrated
detent
for
calibrated A Sweep rates. When
both
TIME/DIV
switches
are
fully
counterclockwise
to
the X-Y position,
the
horizontal
(X-axis}
display
is the
CH
1
input.
44b. DM44 A AND B
TIME/DIV
AND DELAY
TIME-
The controls operate in the same manner
as
37a above.
The A TIME/DIV switch also
controls
the
TIME
lamps and
decimal
point
location when the DM44 is in the
TIME
or
1/TIME MODE.
45.
FINE/POSITION-Positions
the display
horizontal-
ly
for
A sweep and B Sweep
or
on
the
X-axis in the X-Y
mode.
46. X10
MAG-Increases
displayed sweep rate
by
a
factor
of
10.
It extends fastest sweep rate
to
1
nanosecond/division. The magnified sweep
is
the
center
division
of
the unmagnified
display
(0.5 division
either
side
of
the center graticule line}.
47.
VAR-Provides
continuously
variable sweep rates
between the calibrated settings
of
the
A
TIME/DIV
switch.
It extends the slowest A Sweep rate
to
at least 1.25
seconds/division. The A Sweep rate is calibrated when the
control
is
set
fully
clockwise
to
the calibrated detent.
Must
be in the detent position
to
make accurate differential
time
measurements. On instruments equipped
with
a DM44 the
VAR control must
be
in the detent
position
to
make
accurate measurements in the
TIME
and
1/TIME
func-
tions.
48. UNCAL
Lamp-Indicates
the A Sweep rate
is
uncalibrated (VAR
control
out
of
the calibrated detent}.
@
466/464 DM44 Operators
13
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