Heathkit IG-18 User Manual

Page 42
Plug the line cord into an AC outlet.
Turn the POWER switch ON.
Adjust the FEEDBACK control until the
panel meter reads between 6 and 8 on the
0-10 scale.
Set the external voltmeter to read 10 volts
AC.
( ) Connect
the external voltmeter common lead
to the black sine wave output binding post.
Connect the other voltmeter lead to the red
sine wave output binding post.
( ) Rotate the METER CAL control clockwise
until the panel meter reads the same, on
the 0-10 scale, as the voltmeter.
( ) Disconnect the external voltmeter.
NOTE: During the following adjustments the
panel meter pOinter may seem to vary errati-
cally. This is normal. If you encounter difficul-
ties, make the control adjustments in small
increments and allow the instrument time to
stabilize after each adjustm ent.
( ) Turn the SINE WAVE AMPLITUDE control
(fine) to approximately the 3 o'clock posi-
tion.
Adjust the BIAS control until you obtain a
maximum panel meter reading.
Turn the SINE WAVE AMPLITUDE (fine)
control fully clockwise.
Adjust the FEEDBACK control until the
panel meter reads 10 volts.
NOTE: In the following two steps, if no change
can be detected in the panel meter reading, it
will not be necessary to readjust the feedback
control.
) Turn the TENS FREQUENCY switch to each
position, 10 through 100. Leave the switch
in the position where the panel meter indi-
cates the lowest voltage.
( ) Turn the MULTIPLIER switch to eachposi-
hon, Xl through X1000. Leave the switch
in the position where the panel meter indi-
cates the lowest voltage.
( ) Readjust the FEEDBACK control until the
panel meter indicates 10 volts.
This completes the adjustments of the Audio
Generator. Turn off the power and remove the
AC plug from the socket. Proceed with the Final
Assembly on Page 45.
ADJUSTMENTS WITH AC VOL TMETER AND
OSCILLOSCOPE
Set the controls and switches as follows:
POWER SWITCH: OFF.
MULTIPLIER: X100.
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 AMPLITUDE switch
(coarse): 10 volts.
) SQUARE W AVE AMPLITUDE control (fine):
Fully clockwise.
) 600 S1 LOAD: EXT.
NOTE: The following controls are located on
the wave generator circuit board. Refer to
Figure 1 (fOld-out from Page 36) for their loca-
tion. Position each control at its center of ro-
tation.
BIAS.
FEEDBACK.
SYMMETRY.
METER CAL.

Heathkit IG-18 Specifications

General

Brand	Heathkit
Model	IG-18
Category	Test Equipment
Language	English