Heathkit IO-4550 - Page 33

Ye
Y2:
INPUT switch AC
VARIABLE Fully clockwise (CAL)
VOLTS/CM 100mV
POSITION Fully counterclockwise (OF F)
HORIZ POS Center the trace on the screet
Channel Y1: Refer to Figures 16 and 21, and perform
the following lettered steps (A-I). Adjust only the
controls that are marked Y1 or associated with
Channel Y1.
A.
Adjust the POSITION control to place the trace
on the horizontal centerline.
Connect
a
1000
Hz
square
wave
signal
to
the
INPUT
connector.
Adjust
the
signal
amplitude
of
this
signal
for
a
trace
4
cm
high.
Readjust
the
amplitude
of
this
signal
as
necessary
in
the
following
steps
to
maintain
a
suitable
size
trace
(1-4
cm).
(If
your
generator
is
a
fixed
amplitude
type,
you
may
use
the
200
mV
or
500
mV
VOLTS
CM
position
to
obtain
the
proper
display
size.)
Adjust trimmer capacitor C107 (+ 10) to obtain
the proper amount of compensation.
Turn
the
VOLTS/CM
switch
to
the
1V
position
(or
2V
or
5V
if
necessary).
Adjust trimmer capacitor C104 (= 100) to
obtain the proper amount of compensation.
Turn
the
VOLTS/CM
switch
to
the
10V
position
(or
20V
or
SOV
if
necessary).
Adjust trimmer capacitor C101 (+ 1000) to
obtain the proper amount of compensation.
Disconnect the square wave signal.
Turn the POSITION control fully
counterclockwise (OFF).
Channel Y2: Turn the TRIG switch to Y2,+. Then
perform the previously lettered steps (A-I). Adjust
only the controls that are marked Y2 or associated
with Channel Y2.
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