Horizontal And Power - Tektronix 465B Instruction Manual

Operating Instructions—
465B
Service
Figure
2-5.
Trigger controls,
connectors,
and
indicators.
1)
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).
32)
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 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
functions.
UNCAL
Indicator—
LED
illuminates to indicate
that
the
A
Sweep
rate
is
uncalibrated
(VAR
control
is
out
of
the
calibrated detent)
(34)
X10
MAG
Indicator—
LED
illuminates to indicate
that the
X10
magnifier
is
on.
HORIZONTAL
AND POWER
Refer to Figure
2-6
for
location
of
items 29 through 40
(35)
DELAY
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.
(29)
A
AND
B TIME/DIV
AND
DELAY TIME Switches—
TIME/DIV
(clear plastic
skirt)
selects
the
sweep
rate
of
the
A Sweep
circuit for
A Sweep
operation only
Also
selects
the basic
delay time (used
in
conjunc-
tion
with 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.
VAR
control
must be
in
the
calibrated
detent
for
calibrated
A Sweep
rates.
When
the
A TIME/DIV
switch
is
rotated
fully
counterclockwise
to the
X-Y
position,
the
horizontal (X-axis) deflection
is
con-
trolled
by the
Channel
1
input
signal
(30)
POSITION
Control—
Positions the display horizon-
tally for
A Sweep and B
Sweep,
or
on the X-axis
(horizontally)
in
the
X-Y mode.
Provides
both coarse
and
fine control action.
Reverse the direction of
rotation to
actuate fine positioning action
POWER
Switch—
PULL
ON
turns instrument
power
on;
button
pushed
in
turns
power
off.
(37)
POWER ON
Indicator—
LED
illuminates
when
power
is
applied to the instrument.
(3fi)
HORIZ DISPLAY
Switches— Four push button
switches determine the
mode
of
operation
for the
horizontal deflection
system.
A—
Horizontal deflection
is
provided
by
A Sweep
at
a sweep
rate
determined
by the
setting of
the
A
TIME/DIV
switch.
Only
A Sweep
is
displayed,
B
Sweep
is
inoperative.