Tektronix SC 502, Instruction Manual

Page: 50 / 127

e. Check-that the horizontal open i ng, at screen
center, is less t h a n 0.4 graticule divi sion.
f. Disconnect all ca
b
l
e
s and ret urn the
front-panel
co
n
t
r
o
l
s to the prel imi nary setti n gs.
1 9. Check the Trigger
Sensitivity (below
5
MHz)
SECONDS/DIV
VOL TS/DI V
(CH
1
and
CH 2)
DC-GND-AC
.5
jJ
.5
DC
a.
Connect
a
5 MHz si gnal from the l eveled si ne-wave
generator
through
a 50 0
coaxial cable, to
a 50 O termi na­
tion,
to the CH 1
i
n
p u
t
con nector.
b.
Adj ust
the generator' output
am pl itude for 0.4
graticule
di vision on the crt screen.
c. Check-that a tri ggered positi ve-goi ng di spl ay can
be
obtai ned
at
some setting
of
the TRIGG ERING LEVEL
control.
d. Set the
SLOPE switch
to
-
positi on.
e.
C heck-that a
triggered negative-goi ng di splay ca n
be
obtai ned
at
some setti ng
of the
TRI GGER ING
LEVEL
control.
1.
Release
the AUTO button (Normal Mode) .
g. Check-repeat
parts c
through
e .
h. Depress the COUPL ac LF REJ
switch.
i. Check-repeat parts c t
h
r
o u g h e.
j.
Release
the ac
LF R EJ
switch (out
positi on) and
press i n t he
COU PL AC pushbutton.
k. Check-repeat parts c through e.
I.
Release the AC pushbutton and press the AUTO
button.
REV E APR 1980
Calibration Procedure-SC
502
Performance Check
m.
Connect
a
5 M Hz
signal
from the leveled si ne-wave
generator
through
a 50 0 coaxial cable, to a 50 0 termi na­
tion, to the CH
2
input con nector.
n.
Set
the front-panel controls as follows:
MO D E
SO U R CE
SLOPE
CH 2
CH 2
+
o. Repeat parts b th r
o
u
g
h I of the
above procedure to
check the trigger sensitivity for CH 2.
20.
Trigger Sensitivity (5 MHz
to 1 5
MHz)
a.
Change the generator
f
r equ
e n
cy
to
15 MHz and
adjust
t he
output freq uency for
15
MHz.
b. Adj ust the generator am pl it ude for one gra t i c
u
l e
division of
display o n t h e c rt screen.
c.
Set
the SLO PE switch to + position.
d.
Check-that
a triggered positive-goi ng
display
can
be obtai ned at some setti n g of the TRI GG ERING LEVEL
control .
e. Reset the
SLOPE
switch to
-
positi on.
1.
Check-that
a triggered
negative-goi ng
displ ay can
be
obtai ned at some setti ng
of the TRI GG ERING
LEV EL
control .
g.
Release the AUTO button
(Normal Mode) .
h.
Check-repeat
parts c t hrou g h f.
i.
Press the
LF R EJ
button.
j. Check-repeat
parts
c
through f.
k. Release the AC and LF
REJ
pushbuttons to
the
out
position
and
press the
COU P L AC
switch.
I .
Check-repeat parts
c through 1.
4·7