Tektronix 576 - Page 19

28 .
Set t he following Ty p
e 576 controls to :
MAX
PEAK VO L TS

15
VA R IA BLE CO LLE CTO R

F ully Counterclock wise
S
UPPL Y
(T
h e p r otective box may be r
emove d if d esire d .)
29 . Turn t h
e
VA R IA
BLE CO LLE CTO R S UPPL
Y
co
n -
trol until t he d iagonal trace
reac h es t h e center of t
he C
R
T
graticule . Pull
out on t he PEAK
P
O
WER W ATTS switc h
and set it
to 220 . N ote t h at t h e d iagonal trace lengt h ens as
t he switc h is turne d t h ro ugh its r
ange . Also note t h at t h e
S ER I E S RE SISTO RS d ecrease as t
he maximum p ea k power
is inc r ease d .
30 . Allow t h
e
MAX
PEAK VO L TS switc h an d t he
PEAK P O WER W ATTS switc h to
become interloc ke d an d
switc h to 75 . Note t h at t h
e maximum p ea k p ower value
r emains at 220 an d t h at t h
e
S
ER I ES RE SISTO R S values
change .
31 . Set t he following Ty p
e 576 controls to :
ΜΑΧ PEAK
VO L TS

15
PEAK P O WER W ATTS

0 .1
LEF T-O FF-R IG H T
O FF
32 . R emove t he resistor
from t he d io de a da p ter and
re-
p lace it with α silicon dio d
e . Align t h e d io de so t h at its
cat h o d e is connecte d to
the emitter te r minal .
33 . Set th e LEF T-O FF-R
IG H T switc h to R IG
H T an d
turn t h e V A R IA BLE CO
LLE CTO R S UPPL Y cont r ol
cloc k -
wise
. N ote th e d is p lay of t
h efo r ward voltage ch
aracteristic
of t
h e diod e . (see F ig . 2-8)
.
34 . Set
th e CO LLE CTO RS UPPL
Y P
O
L A R ITY switc h
to -(
Ρ
Ν
Ρ ) .
Note
t h e d is p lay of th e
reverse voltagec h arac-
teristic
of th e d io d e (see Fig . 2-8) .
Ρ Ε
ER ,0
DIV
F ig .
2S . Di s p lay o f f o r wa r d a nd reverse
b i as characteristics of a
signa
l d i
ode
.
Ope r ating Instr u ctions-Type 576
35 . Set t he following Ty pe 576 controls to :
P O L A R ITY

+ (
ΝΡΝ )
MOD E DC
Note t h at t he d is p lay of t he forwar d
voltage d iode ch ar-
acteristic h as become α s p ot . T
he s p
ot in
d icates the current
con d ucte d by t h
e
d io d
e
an
d
t
h evoltage across it .
36 . Turn t h e VA R IA BLE CO LLE CTO R S UPPL
Y con-
trol countercloc k wise . N ote t h at t
he s p ot traces out t he
d io de c h aracteristic .
37 .
Set t h e following Ty pe 576 controls
to :
VER
TICA L 1 μ , A
H O R IZO
N TA L 2 V CO LLE CTO
R
V
ertical P OSITIO N Dis p lay Centere d
VA R IA BLE CO LLE
C-

Fully Clock wise
TO R S UPPL Y
MOD E NO R M
LEF T-O FF-R IG HT LEF T
38 . A d j ust t h e L OO
P
I N G CO
MPEN SATIO N control for
minimum trace wid t h (see Fig .
2-9) .
tt
F
ig .
2-9
.
Ad j u st m ent of L OO
PIN G CO MPEN S ATI ON control .
39 . Set t h efollowi ng Ty p e 576 controlsto :
VER TIC A L

5 mA
V ertical P OSITIO N Switc h centere d
V A R IA BLE CO LLE
C-

Fu lly
Countercloc k wise
TO R S UPPL
Y
MOD E AC
LEF T-O FF-R IG H T O FF
2- 11
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