Tektronix 2247A

Performance Check Procedure
c.
Connect
the
time-mark
generator
Marker
Out
through
a
50
1)
coaxial
cable
and
a
50
2
terminator
to
the
digital
delay
(DD
501)
Events
Input.
Connect
the
time-mark
generator
Trigger
Out
through
a
50
2
coaxial
cable
and
a
50
©
terminator
to
the
digital
delay
Start
Input.
Connect
the
digital
delay
Dly'd
Trig
Out
through
a
50
coaxial
cable
and
a
50
2
terminator
to
the
CH
2
input
connector.
d.
Set
the
digital
delay
Count
to
00000,
the
Events
Slope
to
+,
and
the
Start
Slope
to
+.
e.
Press
the
CURSOR
VOLTS
button.
Select
(TO
AUTO
TRACKING
MENU).
Check
that
TRACK
TRIG
LVL
is
underlined.
(If
It
is
not
under-
lined,
select
TRACK
TRIG
LVL
from
the
AUTO
TRACKING
menu.)
f.
Press
the
COUNTER/TIMER
button.
Select
FREQ.
g.
Adjust
the
digital
delay
trigger
levels
so
that
all
TRIG'D
lights
are
on.
Check
for
a
frequency
readout
of
approximately
10
MHz;
If
not,
readjust
the
Events
and/or
Start
trigger
level
on
the
digital
delay
until
the
readout
Is
10
MHz.
h.
Position
the
trace
In
the
middle
of
the
crt.
|.
Press
the
COUNTER/TIMER
button.
Select
WIDTH.
J.
Set
the
digital
delay
Count
to
09999.
The
trace
should
dim
out.
(Inten-
sity
may
need
to
be
readjusted
to
see
the
pulse.)
k. Set the B Trigger SLOPE to ~.
|.
CHECK—the
Trigger
tracking
cursor
falls
in
the
middie
of
the
waveform;
If
not,
push
the
B
TRIGGER
MODE
Tt
button
and
CHECK
again.
m.
WRITE
DOWN—the
readout
(It
should
be
about
20
ns)
In
ws.
(If
the
readout
Is
20
ns,
write
down
0.02
ys.)
Keep
the
readout
in
the
10
to
35
ns
range
by
adjusting
the
digital
delay
trigger
level
slightly.
n. Set the B SLOPE to“.
0.
WRITE
DOWN—the
readout
In
jis.
It
should
be
about
999
pis.
ADD
this
to
the
readout
noted
In
step
m.
7-58
2247A
Operators
at
a
Eg
Ea
CF