Tektronix 576 - Page 14

O p erating Instructions-Type 576
O FF S
E
T
M UL T
Cont r ol
ST
EP
S
B utton

P rovides
PUL S ED ST EP S
B utto n s
ST EP F AM I LY
Bu ttons
R AT E B uttons
2-6
O
PP OS E -Allows zero
ste p of Ste p
Generator outp
u t to be offset as
many as 10
ste p s below its zero off-
set level .
P rovi d es calibrated offset of
ste p Gen-
erato r outp ut to ±10
times AM PL I-
T UD E setting w hen eit h
e r O FF SET
AID or O FF S
E
T O
PP
OS
E button is
p r essed .
ste p s of normal du ration
(ste p lasts for entire
p
erio d of r
ate
cycle) .
Allows Ste p Generator outp ut to be
a pp lie d to Device U nde r Test for only
α po r tio n of no r mal ste p d uration .
Pu lse d ste p s occu r at p ea
k
of
Collector
Sup p ly o u t p u t .
300 μ s-Selects p ulse d ste p s with
d
uration of 300 μ s . Collecto r Sup-
ply is automatically switc h e d to DC
mo d e .
80 μ s-Selects pulse d ste p s wit h
d u ratio n of 80 μs . Collector Sup p ly
ί s a u tomatically switc he d to DC
mo d e .
300 μs an
d 80 μ s- Wh en buttons
are
p
r
esse d toget h er, selects pu lsed
ste
p
s
wit h d uration of 300 μs ; h ow-
ever, Collector Su pp ly is not auto-
matically switc he d to DC mo de .
Allows
ste p s to be gene r ate d in re p eti-
tive families or one family at α time
.
ON
REP - P rovi d es re p etitive Ste
p
Generato r outp ut .
O FF SI NG LE - Pr ovi d es one family
of ste p s w h
e
n
ever button is presse d .
Once button
h as been p resse d , Ste p
Gene r ator
is turne d off until
presse d again
or until ON REP but-
ton is pressed .
Selects rate at
w h ic h ste ps are gene r a-
te d .
N O R
M- P rovi d es normal Ste p Gen-
erato r rate of
1 Χ normal Collector
Su pp ly r
ate (120 ste p s p er secon d
for 60
H z line fre q uency) .
2X-Provides rate of two times nor-
mal rate .
.5X-Provides
rate of one h alf nor-
mal
r
ate .
2 Χ and .5X- Wh en buttons a r e
p resse d toget h er, p rovi d es normal
rate but wit h ste
p
transistions oc-
curing at p ea k of Collector Su pp ly
sweep .
ST
EP /O FF SE T
P O L A R ITY IN-
VERT B utton
ST
EP MUL T .1 Χ
B utton
Controls
Te r minal
Selector
Switc
h
LEF T-O FF-R IG HT
Switch
Inte r loc k
Switch
Connectors
A dap
ter
Connectors
2Χ
and
.5X-Provides normal rate
but with ste p transitio n s occur r ing
at p ea
k of Collecto r Su pp ly sweep .
Allows c
h ange of p olarity of Step Gen-
erator
out p ut (from p olarity set by
P
O
L A R ITY switch ) .
P rovides 0 .1
times multiplication of
ste p am p litu d e,
but
does
not effect
offset .
Stand ard
Test F ixture
Selects way in w
h
ic
h Ste p Generator is
a pp lie d to Device U
nder Test . In all
positions Collector Su pp
ly output is
connected to Collector
terminal .
EMITTER GR O UN D
E D- E mitter
of Device U nd er Test is
connecte d
to groun d .
ST EP G EN -Ste
p Gene r ator is
ap p lie d to base
te r minal of
Device U
n
d
er Test . N o r mal op-
erating p osition
.
OPEN (O R ΕΧΤ )- B ase te r minal
of Device Under Test op en . Ex-
ternal signal a pp lie d to ΕΧΤ
B AS E O R EMITINPUT connec-
tor, will be app lie d to base ter-
min al .
SHOR T- B ase terminal of
De-
vice Und er Test is s
h
orte
d to
emitter terminal
.
B AS
E
G R O UN
D E D- B ase terminal
of Device
U n d er Test is connecte d
to ground
. Step Generator polarity
is inverted .
OPEN (O R ΕΧΤ )- E
mitter ter-
minal of
Device Un d er Test is
op
en . E xternal signal a p plie d to
ΕΧΤ B AS
E
O
R
EMIT
I NPU T
con nector,
will
be
a pp lie d to
emitter terminal
.
STEP G EN -I n verte d Ste
p Gen-
e r ator out p u
t is a pp lie d to emit-
ter of
Device Un d er Test .
Selects w h ic h device
(c h oice of 2) is to
be teste d , left or rig
h t .
E nables Collector Su pp ly w hen P rotec-
tive Box is in p lace an d li d is close d .
Allows connection of various test
ad a p te r s to Stan d ar d Test F ixture .
Connecto r s will acce p t stan d ar d size