Philips pm3232 - Z Modulation; Output Sockets

85
3.2.10.
Z
MODULATION
—
Depress
switch SK4,
+
switch
SK8,
AUTO
switch
SK10
and
BEAM SELECTOR
switch
A SK14
—
Apply
a
positive-going square-wave
voltage
of
20 V, repetition
rate
100 Hz, to
Z MOD
socket
BU7
—
Apply
a
signal which
is synchronous
with
the
former
square-wave voltage
to
Y/\ Input
socket
BUS
—
Check
that
the trace
is blanked during
the positive pulse
3.2.11.
OUTPUT
SOCKETS
3.2.11.1.
Calibration voltage on
CAL
socket
BUI (R761)
—
Check,
with the
aid of an accurate peak-peak
voltmeter, that
the voltage on
CAL
socket
BUI has
a
value
of 600
mVp.p
+
or
—
0,7
%;
if necessary,
readjust potentiometer
R761 (Fig.
3.12.)
—
Check
that the pulse does
not
show
overshoot
and that the repetition frequency
is 2
kHz
+
or
—
20
%
3
2.11.2.
Time-base voltage on
TB OUT socket
BU6
—
Depress
AUTO switch
SK10
—
Set
TIME/cm switch
SK2 to
2
ms
—
Check
that the amplitude
of
the sawtooth voltage
on
TB OUT
socket
BUG is 6 V
+
or
—
20
%
86
Fig,
3,
12,
Adjusting
Fig,
3,
U.