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Tektronix 475A - Page 21

Tektronix 475A
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37.
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.
38.
UNCAL
Lamp--Indicates
the
A
Sweep
rate
is
uncalibrated
(VAR
contro!
out
of
the
calibrated
detent).
39.
X10
MAG
Lamp—
Indicates
that
the
X10
magnifier
is
on.
40a.
DELAY
TIME
POSITION--Provides
variable
sweep
delay
to
more
than
10
times
the
delay
time
indicated
by
the
A
TIME/DIV
switch.
40b.
DM44
DELAY
TIME
POSITION—
Operates
in
the
same
manner
as
41a.
Also,
when
the
DMAA
is
in
the
TIME
or
1/TIME
function,
this
control
operates
in
conjunction
with
the
A
TIME
control.
The
DELAY
TIME
POSITION
contro!
moves
both
the
reference
point
and
ihe
time-
measurement
point.
The
A
TIME
control
moves
only
the
time-measurement
point.
With
the
time-measurement
point
to
the
left
of
the
reference
point
the
Readout
indicates
a
negative
time
difference.
NOTE
You
can
modify
your
instrument
to
make
the
DELAY
FIME
POSITION
control
move
only
the
reference
point.
The
procedure
for
making
this
modification
Is
located
in
the
Operating
Information
section
of
the
DM44
Service
manual.
41.
CALIBRATOR—A
combination
current
loop/square-wave
voltage
output
that
permits
the
operator
to
compensate
voltage
probes
and
check
vertical
gain,
current
probes
and
oscilloscope
operation.
It
is
not
intended
to
verify
time-base
calibration.
42.
POWER—
Turns
instrument
power
on
and
off.
43,
LOW
LINE
Lamp—Indicates
that
the
applied
line
voltage
is
below
the
lower
limit
of
the
regulating
range
selected
by
the
Regulating
Range
Selector.
44.
HORIZ
DISPLAY—Determines
the
mode
of
opera-
tion
for
the
horizontal
deflection
system.
A:
Horizontal
deflection
provided
by
A
Sweep
at
a
sweep
rate
determined
by
the
setting
of
the
A
TIME/DIV
switch.
B
sweep
is
inoperative.
@
475A/DM44
Operators
13

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