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Heathkit IG-18 User Manual

Heathkit IG-18
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DIFFICUL
TY
Measured
voltage
less
than
43
VDC
but
more
than
zero.
No
voltage.
Measured
voltage
about
50
volts.
( )
Turn
the
POWER
switch
off.
This
concludes
the
tests.
Proceed
to
the
Adjust-
ments.
1.
2.
3.
1.
2.
1.
Page
41
POSSIBLE
CAUSE
Diode
D5
or
D6
installed
backwards.
Poor
solder
connections.
Capacitors
Cl,
C2,
C3,
or
C4
installed
backwards.
Transistor
improperly
installed.
Open
circuit
or
short
circuit
on
power
supply
circuit
board.
Zener
diode D7.
ADJUSTMENTS
Two
methods
for
adjusting
the
Audio
Generator
are
provided
below.
The
first
method
uses
only
an
AC
voltmeter,
and
the
second
method
(on
Page
42)
uses
an
AC
voltmeter
and an
oscillo-
scope.
Use
the
second
method
if
you
intend
to
use
the
Audio
Generator
with an
oscilloScope.
This
will
enable
you to
adjust
the
square
wave
Symmetry
control,
which
cannot
be
done
effec-
tively
with
only
a
voltmeter.
ADJUSTMENTS WITH
AC
VOLTMETER ONLY
Set
the
switches
and
controls
as
follows:
)
POWER SWITCH:
OFF.
MULTIPLIER:
XI0.
TENS FREQUENCY: 10.
UNITS
FREQUENCY:
O.
FREQUENCY
control:
O.
NOTE:
The
word
FINE on
the
front
panel
refers
to
the
small
knob on
each
of
the
AMPLITUDE
controls.
COARSE
refers
to
the
large
knob
on
each
of
the
AMPLITUDE
switches.
( ) SINE
WAVE
AMPLITUDE
switch
(coarse):
10
volts.
) SINE
WAVE
AMPLITUDE
control
(fine):
Fully
clockwise.
SQUARE
WAVE
(coarse):
10
volts.
AMPLITUDE
switch
SQUARE WAVE AMPLITUDE
control
(fine):
Fully
clockwise.
600 Q LOAD SWITCH: EXT.
NOTE:
The
following
controls
are
located
on
the
wave
generator
circuit
board.
Refer
to
Figure
1
for
their
location.
Position
each
control
at
its
center
of
rotation.
BIAS.
FEEDBACK.
SYMMETRY.
METER
CAL.

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Heathkit IG-18 Specifications

General IconGeneral
BrandHeathkit
ModelIG-18
CategoryTest Equipment
LanguageEnglish

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