Operating
Instructions
—
Type
575
The
base-source
voltage
is
displayed
vertically
when
the
STEP
SELECTOR
switch
is
in
the
VOLTS
PER
STEP
range.
The
display
is
that
of
the
voltage
steps
which
are
occuring
ahead
of
the
SERIES
RESISTOR.
The
calibration
is indi
cated
by
the
STEP
SELECTOR
switch
except
that
it
is
also
in
volts
per
major
division
as
well
as
volts
per
step.
EXT.
This
switch
position
permits
the vertical
de
amplifier
to
be
driven
by
an
external
signal
applied
through
connectors
on
the
back
panel
of
the
instrument,
or
on
instruments
after
S/N 3659
through
the
pins
of
the
Type 175
adaptor
socket.
The
external signal may
be
either
single-ended
or
push-pull.
POSITION.
This
control
permits
the
display
to
be
moved
vertically
over
the
entire
face
of
the
ert
without
introduc
ing
distortion
into
the
display.
AMPLIFIER
CALIBRATION.
A
three-position
switch
with
two
spring-return
positions
used
to
check
the
ZERO
position
and
the
calibration
of
the
vertical
amplifier.
DC
BAL.
This
control
is
adjusted
to
permit
changing
of
the
amplifier
sensitivity
without
changing
the position of
the
display.
Horizontal
Block
VOLTS/DIV.
BASE
VOLTS.
Selects
the base
voltage
of
the
transistor
under
test
for
the
horizontal
display.
The
sensi
tivity is determined
by
the
resistance
of
an
attenuator.
COLLECTOR
VOLTS.
Selects
the
voltage
on
the
collector
of
the
transistor
under
test
for
the
horizontal
display.
The
various
switch
positions
in this
range
either
change
the
gain
of
the
horizontal
amplifier
or
introduce
attenuation
of
the collector
voltage
signal
applied
to
the
input
of
the
horizontal
amplifier.
BASE
CURRENT
OR
BASE SOURCE
VOLTS.
The
description
of
this
switch
position
is
the
same
as
that
given
in
the
VERTICAL
BLOCK
under
the
same
heading,
except
that
the
display
is
horizontal
instead
of
vertical.
EXT. The
description
of
this
switch
position
is
the
same
as
that
given
in
the VERTICAL
BLOCK
under
the
same head
ing,
except
that
the
display
is
horizontal
instead
of
vert
ical.
POSITION.
This
control
permits
the
display
to
be
moved
horizontally
over
the
entire
face
of
the
CRT
without
in
troducing
distortion
into
the
display.
AMPLIFIER
CALIBRATION.
A
three-position
switch
with
two
spring-return
positions
used
to check
the
ZERO
position
and
the
calibration
of
the
horizontal
amplifier.
DC
BAL.
This
control
adjusts
the
tube-current
balance
in
the
direct-coupled horizontal amplifier
to
permit
changing
of
the amplifier
sensitivity
without
changing
the
position
of
the
display.
Test
Panel
TRANSISTOR
A,
TRANSISTOR
B.
A
three-position
switch
which,
in
either
outside
position,
connects
the
two binding
posts and
the
transistor
socket
indicated
to
the
appropriate
circuitry
within
the
instrument.
In
the
center (off)
position,
it
disconnects
all
power
from
the
transistor,
sockets
and
binding
posts.
EMITTER
GROUNDED,
BASE
GROUNDED.
A
reversing
switch
in
the
base
and
emitter
leads
of
the
transistor
sockets.
It
permits small
transistors
to
be
rapidly
switched between
the
grounded-emitter
and
grounded-base
configurations.
This
switch
does
not
reverse
binding
post connections.
Interpreting
Type
575 Curves
The
following
displays are
devoted
to
some
typical
tran
sistor
displays
and
their
meaning.
While
no
attempt
is
made
to
explain
transistor
terminology
and
parameters,
it
is
hoped
that
these
diagrams
and
curves
will
help
the
operator
to
arrive
at
the
desired
answer
in
less
time,
and
perhaps better
understand
the
operation
of
the
instrument
in
so
doing.
The
transistor
used
in
most
of
the
following
tests
is
the
2N407
PNP
junction
transistor.
The
curves
are
not
necessarily
typical
of
the
average
2N407 as
a
number
of
different
tran
sistors
were
used
in
order
to
best
demonstrate
certain
char
acteristics.
Other
curves
shown
include
those for
the
point
contact
transistor,
Zener
diode,
gaseous
voltage-regulator
tube
NE2,
tetrode
transistor,
photodiode
and
phototransistor.
An
attempt
has
been
made
to
portray
all
of
the
voltages
and
currents that
appear
in
transistor
specifications;
i.e.,
Vce,
Vbe,
Vcb,
BV
ce,
BV
ceo
,
Ico,
lebo,
leo,
etc.
Also,
since
some
manu
facturers
employ
the
hybrid
h
parameters
while
others
use
the r
parameters
(as
in
low-frequency
equivalent
T circuit),
measurements
of
both types
have been
included.
Note: The measurements
obtained
on
the
Type
575 are
valid
for
low-frequency operation only; other
equipment
is
required
for
high-frequency
testing.
The
effects
of temperature
on transistor
operation
are
very
important;
this
can
be
noted
in
the
top two
curves on page
2-7.
The
temperature
effects
can
be
portrayed
with
the
aid
of a
thermocouple
or
heat
box,
or
by
means
of
an
oil
bath
and
heating
element.
@®i
2-9
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 ...