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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.
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