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Type 576
SECTION 2
OPERATING INSTRUCTIONS
Change
information,
if any, affecting this section will be found at the rear of the manual.
WA RlfllfG
I
The
Type 576
is
considered safe as shipped.
Any
modification of the interlock
system
in order
to
over-
ride its
purpose
of
protecting
operators from danger-
ous voltages,
will make
operation of the instrument
potentially
hazardous.
Operators
of the instrument
should always be aware of the fact that when the
red
light is on dangerous voltages may appear
at
the Col-
lector terminals.
General
This section of the instruction manual provides information
necessary for operating the Type 576 and for using it to test
various semiconductor
devices. Included are
setup
proce-
dures. a description of the Type 576
controls
and
connectors.
a
discussion
of
the theory of the instrument, a first time
operation
procedure
,
and
general
operating
information.
Also included is
a
section
describing the use
of
the Type 576 for measuring the
characteristics
of
various semi-conductor
devices.
INITIAL CONSIDERATIONS
Cooling
The Type
576
maintains
a safe .operating
temperature when
operated
in
an
ambient temperature between
oo
c
(32
°F)
and
50°C (122
°F)
.
Adequate
clearance on
all
sides of
the
instru-
ment
should
be provided to
assure
free
air
flow and dissipation
of
heat
away
from the instrument. A thermal
cutout
in
the
in-
strument provides
thermal protection by disconnecting the
power to the instrument if the internal temperature
exceeds
a
safe operating
level. Power is automatically restored when
the
temperature returns to
a safe
level. It
should
be noted that the
instrument
will
turn
off
under
certain conditions of
high
collec-
tor
supply current output or
high
step
generator
current output
even
though the instrument is being
operated
in
an ambient
temperature
which
is within the
specified
range
.
See
foot notes
in
the
Specification section
for further information.
Operating Voltage and Frequency
The Type
576 can be operated
from
either
a 115-volt
or a
230-volt
line
voltage source
.
The LINE VOLTAGE
SELECTOR
assembly
,
located
on
the rear panel
,
allows conversion of
the
instrument
so
that it may be
operated
from one line
voltage
or
the
other.
In
addition,
this
assembly changes
the
connections
of
the power
transformer
primary
to allow selection of
one
of
three regulating ranges
(see
Table
2-1).
The assembly also
in-
cludes
the two line fuses
.
When the instrument is
converted
from
115-volt
to
230-volt operation or vice
versa,
the
assembly
selects
the proper fuse to provide the
correct
protection for the
instrument.
REV MAR 1985
The Type
576
may be
operated
from
either
a 50 Hz
or
a
60Hz
line
frequency
.
In order to
synchronize
the
step
genera-
tor
with
the
collector supply,
the 60Hz-50 Hz switch, located
on
the Type 576 rear panel below the LINE VOLTAGE
SELEC-
TOR assembly
,
must be
set
to the position which
corresponds
to the line frequency being
used.
Use the following procedure to
convert
this instrument
be-
tween line
voltages
,
regulating ranges
or
line
frequencies:
1.
Disconnect the
instrument
from the power
source
.
Range Selector
Switch Position
LO (switch bar
in
left
holes)
M
(sw1lch bar
in
m1ddle
holes)
HI
(SWIICh
bar
in
nght
holes)
TABLE 2-1
Regulating Ranges
Regulating Range
115 Volts
230 Volts
Nominal
Nominal
90
to
110
vol
ts
180
to 220 volts
104
to 126
volts
208 to 252 volts
11
2 to 136
volts
224
to 272 volts
Fig.
2-1. Line
Voltage
Selector
assembly and 60Hz
switch
on
the
rear
panel
(shown
with
cover removed).
2-1
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