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Tektronix 114 - Page 25

Tektronix 114
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Maintenance
and
Calibration
—
Type
114
Fig.
4-17.
Test setup
for
checking external
triggerin
g
16.
Check
external
triggering
and
trigger
out
put
operation
a.
Set
the
Type
114
PERIOD
control
to
1
µ
S,
s
et
the
WIDTH
control
to
100
nS
and
set
the
VARIABLE
controls
to
CAL.
b.
Connect
a
50
Ω
coax
from
the
Type
180A
MARKER
OUT
connector
to
the
Type
114
EXTERNAL
TRIGGER
—
IN
PUT
connector.
Set
the
Type
180A
for
1
microsecond
markers.
c.
Connect
a
50
Ω
coax
from
the
Type
114
TRIGGER
OUT
PUT
connector
to
the
Type
1A1
Chonnel
1
input
(see
Fig.
4-17).
Set
the
Type
1A1
MODE
switch
to
CH
1.
Set
the
Type
1A1
Channel
1
VOLTS/CM
switch
to
1.
d.
Set
the
Type
547
TIME/CM
IB]
switch
to
1
µ
SEC
and
adjust
the
TRIGGER
LEVEL
control
for
a
stable
display.
Check
for
1
pulse/cm
of
3
volts
amplitude
±1
volt.
e.
Insert
the
50
Ω
termination
between
the
coax
and
the
Type
1A1
Channel
1
input
connector.
Change
the
Channel
1
VOLTS/CM
switch
to
.2.
The
amplitude
of
the
trigger
pulse
from
the
Type
114
should
now
be
between
0.4
and
0.7
volt
as
measured
on
the
crt.
f.
Switch
the
Type
114
TRIGGER
switch
back
and
forth
between
LEADING
EDGE
and
TRAILING
EDGE.
The
display
on
the
crt
should
flicker
slightly
and
show
minor
differences
between
the
leading
edge
and
trailing
edge
trigger
pulses.
g.
Turn
the
Type
114
PERIOD
control
to
EXTERNAL
TRIG
GER
and
note
that
the
display
remains
the
same.
Return
the
PERIOD
control
to
1
µS
17.
Check
pulse
risetime,
falltime,
and
aber
rations
a.
Set
the
Type
547
TIME/CM
(B
)
switch
to
.2
µ
SEC.
Set
the
Type
1A1
VOLTS/CM
switch
to
2.
b.
Remove
the
50
Ω
coax
from
the
Type
1
1
4
TRIGGER
OUTPUT
connector
and
connect
it
to
the
OUTPUT
connector.
Check
to
sec
that
the
50
Ω
termination
is
between
the
50
Ω
coax
and
the
Type
1A1
Channel
1
input
connector.
Set
the
Type
114
AMPLITUDE
control
for
maximum
positive
output.
c.
Obtain
stable
triggering
and
adjust
the
AMPLITUDE
—
VARIABLE
control
for
5
cm
of
vertical
deflection.
d.
Rotate
the
Type
114
WIDTH
—
VARIABLE
control
for
2
complete
cycles
in
the
10
cm
of
the
graticule
(see
Fig.
4-18).
e.
Check
that
the
aberrations,
such
as
those
shown
in
Fig.
4-18
do
not
exceed
5%
peak-to-pe
a
k
(2
’
/
2
mm
or
1
'/
4
minor
graticule
division).
f.
Change
the
AMPLITUDE
switch
to
—
3
to
10
V
and
re
peat
the
aberration
check.
g.
Change
the
AMPLITUDE
switch
back
to
+3
to
10
V.
Change
the
Type
547
TIME/CM
(B)
switch
to
.1
µ
SEC
and
obtain
a
stable
display.
4-11

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