Operating
Instructions —
Type
175
Interconnecting
10-32
x
1
'A
bolt
Power
cable
(Type
175
to
Type
575)
and
nut (2)
Fig.
6-5.
Typo 575
tllt-mountod
on
Typo
175.
OR
VOLTAGE
PER
DIVISION
and
the
HORIZONTAL
VOLTS/DIV.
switches
on
the
Type
575 must be set
to
EXT.
For
convenience,
power
Io
the
Type
575
can
be
obtained
from
the
POWER
TO
TYPE
575
connector
on
the
rear
of
the
Type
175.
In
this
case,
power
Io
both
instruments will
be
controlled
by the
Type
175
POWER
ON
switch.
How
ever,
if
it
is
intendod
that
the
Type
575
will
be
used
fre
quently
without
the
Type
175,
it
may
be
connected
indepen
dently
to
its
own
power
source,
if
desired.
It
is
not
recom
mended
Io
have
power
applied
to
the
Type
175
when
the
Type
575 is
turned
off.
A
discussion
of
the
front-panel
controls
of
the
Type
175
and
their
relationship
to
the
front-panel
controls
of
the
Type
575
follows.
With
the
VERTICAL
CURRENT
OR
VOLTAGE
PER
DIVISION
ond
HORIZONTAL
VOLTS/DIV.
switches
on
the
Type
575 set
to
EXT.,
all
other
controls
on
the
Type
575
whose
functions are
duplicated
by
controls
on
the
Type
175
have
no effect
on
the
operation
of
the
instruments.
VERTICAL
DISPLAY Switch
The
VERTICAL
DISPLAY
switch
on
the
Type
175
takes the
place
of
the
VERTICAL
CURRENT
OR
VOLTAGE
PER
DIVI
SION
switch
on
the
Type
575,
except
that
there
is
no
pro
visions
for
displaying
base
volts
vertically
on
the
Type
175.
The
VERTICAL
DISPLAY
switch
selects
the
amplitude
of
the
signal
fed
to
the
Vertical
Amplifier
of
the
Type
575.
This
signal
is
proportional
to
the
collector
current
flowing
through
the
transistor
under
test.
The
POSITION
control,
AMPLIFIER
CALIBRATION
switch,
and
DC.
BAL.
adjustment
in
the
VERTICAL
block
of
the
Type
e
575
perform
exactly
the
same
functions
os
they
do
without
the
Type
175.
COLLECTOR
SWEEP
Block
All
of
the
controls
in
the
COLLECTOR
SWEEP
block
of
the
Type
175
perform
the
same
functions,
except
for
range
of
operation,
as
the corresponding
controls
on
the Type
575.
On
the
Type
175,
there
is
no
DISSIPATION
LIMITING
RE
SISTOR
switch;
the
300-ohm
resistor inserted
in
series
with
the collector
of
the
transistor
in
one of
the
PEAK
VOLTS
RANGE
switch
positions
is
the
only
dissipation
limiting
re
sistor
available
in
the
Type
175.
If
you wish
to
insert
ad
ditional
external
dissipation
limiting
resistors,
connect
them
in
series
with
the
collector
of
the transistor
under test.
With
these
additional
resistors
inserted
in
the circuit,
it
will be
necessary
to use test leads
connected
to
the
V^
EXT.
INPUT
terminals,
as
described
in
the
discussion
of
the
Transistor
Test
Panel,
for
accurate
presentation
of
collector-to-emitfer
voltages.
BASE STEP GENERATOR
Block
All
of
the
controls
in
the
BASE
STEP
GENERATOR
block
of
the
Type
175
perform
the
same
functions,
except
for
range
of
operation,
as
the
corresponding
controls
on
the
Type
575.
The
Display Selector switch
(REPETITIVE-SINGLE
FAMILY),
the
STEP/FAMILY
control,
and
the STEPS/SEC.
switch
on
the
Type
575 perform
the
same
functions
as
they
do
without
the
Type
175.
Transistor
Test Panel
The
Transistor
Tost
Panel
of
the
Type
175
is
basically
the
same
as
that
of
the
Type
575. Special connectors
and
cables
are
provided
for
high-current
applications
and
for elimina
tion
of
measurement
errors due
to
voltage
drops
in
high-cur-
rent-carrying
leads.
As with
the
Type
575
panel,
the
collector,
base,
and
emitter
connections
arc
made
to
the
binding
posts
C, B and
E,
respectively.
If
a
peak
collector
current
of
more
than
about
25 amperes
is
expected,
connect
the
collector
and
emitter
to
the
large
C
and
E
terminals
on
the
Type
175
through
the
high-current
test
cables
provided.
With
long
leads
to
the
collector
and emitter of
high-cur-
rent
transistors,
or
with
dissipation limiting
resistors
inserted
in
series
with
a
transistor, the voltage
drop
in
the
leads
themselves
may
be
enough
to
introduce
a
significant
error
into
the
voltage
across the
transistor
as
seen
by
the
oscillo
scope.
This
problem
can
be
eliminated
by
connecting
test
leads
from
the
collector
and
emitter
of
the
transistor under
test
to
the
red
and
black Vco
EXT.
INPUT
terminals,
respec
tively.
These
test
leads
are
essentially
non-current-carrying
and
provide a
more
accurate
indication
to
the
Horizontal
Amplifier
of
the
voltage
at
the
transistor
itself.
Also, the voltage
drop
in
a
high-current-carrying
emitter
lead
can
cause
some
loss
in
the
base-drive
voltage
at
the
transistor,
thereby
making
each
base
step
less
than
that
in
dicated
by
the
setting
of the
STEP
SELECTOR
switch. (This
applies
only
when
the
STEP
SELECTOR
is
in one of
the
VOLTS/STEP
positions.)
For
this
reason,
when
high-current
transistors
are being
tested
with
voltage
steps
at the
base,
6-3
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 ...
Page 6: ...NOTES ...
Page 26: ...NOTES ...
Page 48: ...NOTES ...
Page 54: ...Recalibration Type 575 C706 Fig 5 3 Left Side View 5 6 ...
Page 56: ...NOTES ...
Page 100: ...INPUT AMPLIF1E ...
Page 104: ...TYPE 575 TRANSISTOR CURVE TRACER ...
Page 108: ...OSCILLATOR 4OOV UNREG TYPE 575 TRAN5I5TOR CURVE TRACER AB ...
Page 115: ... 300 ...
Page 119: ...Type 175 Tent S N 570 PARTS LIST CORRECTION Change to Q233 151 0137 00 2N21U8 MIO 298 1165 ...
