Heathkit IG-18 User Manual

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.

Heathkit IG-18 Specifications

General

Brand	Heathkit
Model	IG-18
Category	Test Equipment
Language	English