Tektronix 576 - Display Amplifier Calibration

e . C HE CK
F
O
R-PER VER T DI V rea d o u t coinciding
wit h setting of t
he VER TICA L switc h u sing CO LLE CTO R
current units
. (T h e rea dout s h oul d be blan k for t he ST EP
G EN p osition of t he switc
h .)
f . Set t he Ty pe 576 DIS PL AY O FF S
E
T Selector
switc h
to VER T Χ 10 an d turn t he VER TICA
L switc h t h roug h out
its range .
g
. C HE CK
F
O
R-PER VER T DI V rea dout of 10 times
less t han t he
setting
of
t h e VER TICA L switc h u sing CO L -
LE CTO R current units
.
h . Set t he Ty p e 576 M OD
E switc h to LE A K AG E an d
t he DIS PL AY O FF SE T
Selector switc h to NO RM (OFF) .
i . Turn t h e VER TICA L
switc h t h ro ugh out its range .
j . C HE CK
F
O R-PER
VER T DI V rea d out coinciding
wit h setting of
t he VER TICA L switc h using EM ITT ER cur-
rent units .
k . Set t he DIS PL AY O FF S
E
T
Selector switc h to V ΕR Τ
Χ 10 and turn t he VER TICA L switc
h t h roug hout its range .
wit h t he setting of t
h e H
O
R IZO N TA L switc h . (T he readout
sh oul d be blan k
for t he
ST
EP G EN p osition of t he switc
h .)
ο . Set t he DIS PL AY O
FF SET Selector switc h to
H O R IZ Χ 10 and
turn t h e HOR IZO N TA L switc h through-
out its ra n ge .
ρ . C HE CK F O R-PER HOR IZ DI
V rea dout of 10 times
less t han t h esetting of t h e H O R IZO N TA L switc h
.
q . T u rn t he Ty pe 576 A MPL IT U D E switc h t
h
roug
hout
its
range .
r . C HE CK F O R-PER ST
EP
rea d
out coinci d ing with t he
setting of t he A MPL IT
U
DE
switc h .
s . P ress t h
e
Ty p
e
576 ST
EP Μ U L T .1 Χ button an d turn
t he ΑΜΡ L 1 ΤU DE switc
h
t
h roug hout its r ange .
t . C HE CK F O R-PER
ST EP rea dout 10 times less t h an
t h e setti n g of t h
e
A
MPL IT U D E switc h .
υ . R elease STEP MUL T .1 Χ button .
P erfo r mance C h ec k /Calibration-Type 576
ΝΟΤΕ
It is α tedious p rocess to c h ec k all t h e p ossi b le p osi-
tions of t h e VER TICA L a nd AMPL IT UD
E switc h es
w h ic h will pr ovi de α β OR g m
PER DI V readout . T he
following p rocedure c
h
ec
k
s only
t h at all β OR g m
PER
DI
V fi b er-optics will lig h t up .
ν . Set t he Ty pe 576 V E R TICA L and A MPL IT U D
E
switc h es as sh own in Table 5-2 .
TA
BLE 5-2
C h ec
k β
OR g m
PER DI V R eadout
DIS PL AY A MPL I F I ER S
7 . Ad j ust B alance of
H
orizontal
Dis
p
lay Am p lifier
α . Set t he Ty p e 576 DIS PL AY O FF SE T Selector switc h
to ΗΟ R ΙΖ X10 and position t he sp ot to t he center of t h e
gratic u le using t he F I NE P OSITIO N controls .
b . Set t
he
Ty p
e 576
DIS
PL
AY O
FF
S
E T
Selector switc
h
to H O R IZ Χ 1 .
c . C HE CK F O R -Spot in
center of gratic u le .
d . AD JU ST- R 681, H O R IZ C EN T ad j ustment, on
t he
DIS PL AY AMP circuit boar d (see F ig . 5-6) if t h
e s p ot is not
centere d .
e .

R
ep
eat p
arts α t h ro ughc until no movement of t he spot
occurs
between t he two settings of t he DIS PL AY O FF SET
Selector switc h .
f . Set t h e following Ty p
e
576
controls to :
DIS PL AY O FF S
E
T Selector

ΗΟ
R ΙΖ Χ 10
H O R IZO N TA L 1 V CO
LLE CTO R
5-9
VER TICA L
AMPL IT U D E β OR g m
PER DI V
200 μΑ
2V 100
μ
200 μΑ .1
V 2 m
200 μΑ .05
μΑ 4 k
500 μΑ .1 μΑ 5
k
500 μΑ .2 μΑ 2 .5 k
500 μΑ 1 μ , Α 500
Ι . C HE CK F O R-PER VER T DI V rea dout of 10 times less
t
h
an
t he setting of t h e VER TICA L switc h using EM ITT ER
current . ( R ea d out s h oul d be blan k for 1 ηΑ , 2 ηΑ αη d 5 ηΑ
settings of V Ε RΤ 1CA L swi tc h .)
ω . C HE CK FOR-0 O R g m PER
wit h t heth ird column of Table 5-2 .
χ
. Set t
he fol lowing Ty pe 576
DI V reado u t coinci d ing
controls to :
VER TICA L .5 Α
m . Set t he Ty p
e
576
DIS PL AY O FF S ET Selector
DIS PL AY O FF SE T Selector N O RM (O
FF)
switc h to N O RM (O FF) and
turn t he H O R IZO N TA L
H
O
R IZO N TA L 2 V CO LLE CTO R
switc h t h roug h out its range .
A
MPL IT U D E 2 V
η C HE CK
F
O
R-PER ΗΟ R ΙΖ DI V rea d out
coinci d ing