switch (pull
out
and rotate
to
unlock) selects the
sweep rate for the B Sweep circuit for delayed sweep
operation only. VAR control must
be
in
the cali·
brated
detent
for calibrated A Sweep rates.
When
the A TIME/DIV switch
is
rotated fully counter-
clockwise
to
the
X·Y
position, the horizontal (X-axis)
deflection
is
controlled by
the
Channel 1 input signal.
SA
AND B TIME/DIV AND DELAY TIME Switches
(used with
DM44)-0peration
is
the same
as
36a.
The A TIME/DIV switch also controls the TIME
indicators and decimal
point
location when the DM44
is
in
the TIME
or
1/TIME Function.
@POSITION
Control-Positions the display horizontal-
ly
for A Sweep and B Sweep, or on the X-axis (hor·
izontally)
in
the
X-Y
mode. Provides both coarse and
fine control action. Reverse the direction
of
rotation
to
actuate fine positioning action.
@ X10
MAG
Switch-When pressed in, increases
dis-
played sweep rate
by
a factor of 10. Extends fastest
sweep rate
to
2 nanoseconds/division. The magnified
sweep expands the center division of the unmagnified
display (0.5 division either side of the center graticule
line).
@ VAR Control-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. It must
be
in
the
detent
posi·
tion
to
make accurate differential time measure·
ments. On instruments equipped with a DM44,
the
V
AR
control must be
in
the
detent
position
to
make
accurate measurements
in
the TIME and 1/TIME
functions.
@UNCAL
Indicator-LED
illuminates
to
indicate
that
the
A Sweep rate
is
uncalibrated (VAR control
is
out
of
the
calibrated detent).
@ X10
MAG
Indicator-LED
illuminates
to
indicate
that
the
X 10 magnifier
is
on.
SDELAY
TIME POSITION
Control-Selects
the
amount
of
delay time between
the
start
of
A Sweep
and start of B Sweep. Delay time
is
variable
to
at
least
10 times the time indicated by
the
A TIME/DIV
switch.
14
465B/DM44
Operators
@
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