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Tektronix 475A - Vertical Gain Check; Basic 475 A Timing Check; DM44 Timing Check

Tektronix 475A
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Vertical
Gain
Check
Obtain
a
Normal
Sweep
Display
presentation
of
the
calibrator
square-wave
voltage.
Set
the
appropriate
VOLTS/DIV
switch
to
the
50
mV
position
and
the
Input
Coupling
switch
to
DC.
Make
sure
the
VAR
VOLTS/DIV
control
is
in
the
calibrated
detent.
Check
that
the
vertical
deflection
is
5.8
to
6.2
divisions.
Basic
475A
Timing
Check
(60
Hertz
Line
Only)
Obtain
a
Normal
Display.
Set
the
A
TIME/DIV
switch
to
5
ms
position,
Set
the
A
Trigger
SOURCE
switch
to
LINE.
Push
the
TRIG
VIEW
switch
and
hold
itin.
This
displays
a
sample
of
the
line
voltage.
Use
the
A
Trigger
LEVEL
control
to
vertically
position
the
top
of
the
display
to
within
the
display
area.
Use
the
horizontal
position
control
to
position
the
left
peak
to
the
left
graticule
edge
(see
Fig.
12),
Verify
the
horizontal
distance
between
the
first
and
the
fourth
peaks
is
9.8
to
10.2
divisions.
If
the
fourth
peak
is
not
visible,
verify
the
horizontal
distance
between
the
first
and
the
third
peaks
is
6.53
to
6.79
divisions.
DM44
Timing
Check
(60
Hertz
Line
Only)
Perform
the
Basic
475A
Timing
Check
to
verify
the
accuracy
of
the
horizontal
deflection
system.
Leave
controls
set
as
for
the
Basic
475A
Timing
Check
except
as
follows:
8
TIME/DIV
HORIZ
DISPLAV
B
SOURCE
FUNCTION
A
TIME
5
us
A
INTEN
i
STARTS
AFTER
DELAY
TIME
To
move
the
time-
measurement
point
to
the
right
of
the
reference
point.
9,8
TO
10.2
LIL
H-
HEC
E
ER
A
E
1738-14
Fig.
12.
Basic
475A
timing
check.
30
475A/DM44
Operators

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