Operating
Instructions
—
Type
575
FIs
2-7.
Function
of
tott-panel
controls.
Setting
Up
The Front-Panel Controls
In
displaying
transistor
curves
on
the
Type
575 we are
concerned
with two
considerations.
..
properly
displaying
the
curves we
wish
to
interpret,
and
protecting
the transistor
un
der
tost
from
damage.
If we
know
quite
a
bit
about
the
transistor.
..
that
is,
if
we
know
such
factors
as
the
collector
dissipation
rating,
col
lector
current
and
emitter
current
ratings, colloctor-fo-basc
and
collector-to-cmitler
voltage
ratings.
.
.then
we can
set
up"
the
front-panel
of
the
instrument
without
danger
of
damag
ing
the
transistor.
However,
if
all
we
know is
whether the
transistor
is
an
NPN
or
a
PNP,
more
care
must
be
exercised
when
setting
up
the
front-panel
controls.
The
General
Procedure
that
follows
is
an
outline
of
the
steps
involved in
setting
up
the
front-panel
controls
to
obtain
a
collector
family
of
curves.
Following
the
General
Proce
dure is
a
step by
step procedure for
setting
up
the
controls
for
a
transistor
of
unknown
characteristics,
to
obtain
a
col
lector
family,
and
then
a
procedure
for
obtaining
a
collector
family
for
a
transistor
of
known characteristics.
General Procedure
Indicator
Unit
1.
The
INTENSITY
control
is
turned
to
mid-scale;
this
will
prevent
damage
to
the
ert
phosphor
when
the
power
is
turned
on.
2.
The
POWER
switch
is
turned
ON,
so
that
the
instru
ment
can
be
warming
up
while
it
is being
set
up for
use.
Test Panel
3.
The
Configuration
switch
is
set
to the EMITTER
GROUNDED
position
(if
a
common-emitter
configura
tion
is
desired).
4.
The
Comparison
switch
(TRANSISTOR
A-TRANSISTOR
B)
is
set
to
the
center
position;
this
prevents the
appli
cation
of
any
voltage
or
current
to
the
transistor
socket.
Collector
Sweep
Block
5.
The
POLARITY switch is
set
to
the
proper
polarity
for
an NPN
or
a
PNP
transistor.
6. The
DISSIPATION
LIMITING RESISTOR
switch
is set
to
the
proper value
to
prevent
excessive collector
dissi
pation.
7. The
PEAK
VOLTS
RANGE
and
the
PEAK
VOLTS
switches
are
set
for
the
proper
amplitude
of
collector
sweep
voltage.
Base Step Generator Block
8.
The
Display
switch
is
set
to
REPETITIVE
so
that
we
may
view
a
continuous
display.
9.
The
STEPS/FAMILY
control
is
adjusted for the
number
of
curves we
wish
to
display.
10. The
POLARITY
switch
is
set
to
—
if
the
transistor
under
test
is
a
PNP
(since
we
are
in
the
grounded-emitter
con
figuration),
or
to
4-
if
an
NPN
transistor
(again
in
the
grounded-emitter
configuration).
11. The
STEPS/SEC.
switch
is
set for
the
desired
step
rate
of
the
Base Step Generator
(either
120
or
240
steps/
second).
12. The
STEP SELECTOR
is
set
for
the
current
per
step
or
voltage per
step
that
we
wish
to apply
to
the
base.
12.(c)
If
voltage
steps
ore
applied
to
the
base
of
the
transistor
under
test, the
proper
value
of
SERIES
RESIS
TOR
must
be
switched
into
the
circuit
to
limit
the
base
current.
2-5
Summary of Contents for 175
Page 4: ...VWTICM OINltAlO TRANSISTOR CUM TRACfR UB l COUlClO r hokizoniai VCKIJ O lUnK Hix M Type 575 z ...
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Page 54: ...Recalibration Type 575 C706 Fig 5 3 Left Side View 5 6 ...
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Page 100: ...INPUT AMPLIF1E ...
Page 104: ...TYPE 575 TRANSISTOR CURVE TRACER ...
Page 108: ...OSCILLATOR 4OOV UNREG TYPE 575 TRAN5I5TOR CURVE TRACER AB ...
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Page 119: ...Type 175 Tent S N 570 PARTS LIST CORRECTION Change to Q233 151 0137 00 2N21U8 MIO 298 1165 ...