Eico 667 - OPERATING INSTRUCTIONS; Initial Setup Procedures; Tube Testing - Continuation

PAGE
4
‘
-jEWQL,
6
67 TUBE
TESTER
At
the
1
position for either
transistor
type,
the
meter
is
inserted
in
the
collector
circuit
in series
with
a
IK current-limiting
resistor
to
measure
the
current
(I
ceo
)
under
these
conditions.
At
either
2
position, a
200Kresistor
is
connected
between
the
collector
side
of
the
power
supply
and
the
base to put a small
current
into
the
base. The
current
gain,
Beta,
is then
read
on
the
meter,
which remains
in the
collector
circuit.
WARNING:
Be
certain
as to
the type
of
transistor
(n-p-n
or p-n-p)
you
aretesting.
Testing
a
transistor
using
the
positions
designated
for
the
opposite
type
may
damage
the
tester
meter
or
the
transistor.
Note
that
shorted
transistors
may
cause the
meter to
read
past full
scale
at
the
"N-P-N
1"
or
"P-N-P
1".
Should
this
occur, turn
the
switch
back
to the
"TUBE"
position
immediately
and
discard
the
defective
transistor,
after
you have
first
checked
to see
that
the
correct
test position
was used
for the
particular
type.
SPECIAL
SOCKET
CONNECTIONS
—
Several
socket
terminal
connections
are
not
standard
and
should
be
noted.
The
pilot
light
socket
in
the center
of
the
NOVAR
socket
is connected
across
the
selected
filament
voltage
(shell
to ground,
center
post to
filament
switch
arm).
The
center
of the loctal
socket is
connected
to
ground.
The
sub-miniature
in-line
socket
has
no
numbers
assigned
to its seven
terminals.
In the
Model
667,
these
terminals
are
connected
to the
push-
switches
as
if
they were
numbered 1
to
7
beginning
at the index
dot on
the panel.
However,
a
consistent
connection
procedure
has been
established
(the roll
chart
settings
are
given
accord-
ingly),
which
is as follows: With
tube
base and
socket
indexes
matched
(dot
or spur
on tube
base to dot
at
right
of socket
on
the panel),
the
tube leads
are
inserted
in order
so as not
to skip
any
socket
terminals starting
from
the
extreme
right.
OPERATING
INSTRUCTIONS
PRELIMINARY
STEPS
FOR TUBE
OR TRANSISTOR
TESTING
1.
Insert
the power
plug
in a
105-130
volts
AC,
60
cps
line
outlet.
Do not
use a
DC
line
outlet
or
any AC
line outlet
other
than
specified
above.
2.
Turn
the tester
on
by
rotating
the LINE
ADJ.
control
clockwise
from
AC-OFF.
3.
Set
the
TRANSISTOR
TEST
selector
to
TUBE, regardless
of
whether
it
is a
tube or
transistor
that
is to
be tested.
4.
Make
a preliminary
line
adjust
by
holding
down
the LINE
button
while
turning
the LINE
ADJ. control
until the
meter
pointer
is
over
the
LINE
ADJ.
mark
on
the meter
(center
scale).
Release
the LINE
button at
the
conclusion
of the
adjustment.
TUBE TESTING
CONTINUED
5.
Press
the RESET
button to release
any
button
which may
be
down
from
a
previous
setting.
Make
sure the
TRANSISTOR
TEST
selector
is set at
"TUBE".
6.
Move
all
15
lever
switches
down
to the
"1"
position.
7. Rotate one or
both
roll
chart
wheels
until
the
tube
type
you wish
to test
appears
in one
of
the
windows.
Obsolete
types
will
be
found
in a
supplement
to
this manual.