Tektronix 7B10 Instruction Manual page 60

Calibration Part
I
-7B10
Performance Check
A2.
CHECK
TRIGGERING
MODES
j.
Remove
the low-frequency function generator cable
from
the
vertical
amplifier unit
and
connect
the high-
SETUP CONDITIONS frequency sine-wave generator
to
the
amplifier input
with
a
10X
attenuator.
NOTE
If
the
preceding
step
was
not performed,
first
refer
to
the Triggering System
Preliminary
Control Settings, then proceed with
the
following
instructions.
a.
Set the
TRIGGERING LEVEL
control
for
a stable
display
(TRIG'D
light on).
b.
CHECK
—
For
a
free-running
display with the
TRIG'D
light off
when
the
TRIGGERING LEVEL
control
is
set
fully
clockwise and
fully
counterclockwise.
c.
Set the
TRIGGERING
MODE
to
NORM.
d.
Set the
TRIGGERING LEVEL
control
for a
stable display
(TRIG'D
light on).
e.
CHECK
-For
no
display (TRIG'D
light
off)
when
the
TRIGGERING LEVEL
control
is
set
fully
clockwise
and
fully
counterclockwise.
f.
Set
the
TRIGGERING LEVEL
control
for
a stable display
(TRIG'D
light on).
g.
Set the
TRIGGERING
MODE
to
SINGLE
SWP
and
the
SOURCE
to
EXT.
h.
CHECK-Press
the
SINGLE
SWP
RESET
push
button
and check
that
the
READY
light
is
on.
i.
CHECK
—
For
one
sweep
and
that the
READY
light
is
out
after
completion
of
that
sweep
when
the
INT
SOURCE
push
button
is
pressed
(oscilloscope intensity
may
need
to
be increased
to
view
the single-sweep
display).
k.
Set the time base
TRIGGERING
MODE
to
HF SYNC
and
the
TIME/DIV
to
2
ns.
l.
Set the high-frequency sine-wave
generator
and
amplifier plug-in
unit deflection factor
for
approximately
a
1
-division display
of
250
MHz
signal.
m.
CHECK--For
a stable display
(TRIG'D
light on)
at
all
positions
of
the
TRIGGERING LEVEL
control.
n.
Set the
TRIGGERING
MODE
to
AUTO,
SOURCE
to
EXT,
and
TIME/DIV
to
10
ps-
A3.
CHECK
EXTERNAL
LEVEL
RANGE
SETUP CONDITIONS
NOTE
If
the preceding
step
was
not performed,
first
refer
to
the Triggering
System
Preliminary
Control
Settings,
then proceed
with
the
following
instructions.
a.
CHECK
—
That
all
levels of the positive slope
may
be
selected
for
the
sweep
starting point as the
TRIGGERING
LEVEL
control
is
rotated
throughout
its
range
(indicates
an
external
level
range
of at least plus
and minus
1
5
volts).
Check
that
the display
is
not triggered
at
either
end
of
the
LEVEL
control
rotation.
b.
CHECK-Change
the
TRIGGERING SLOPE
to
(-)
and
repeat
part a
for
the negative slope
of
the
waveform.
5-9