Philips PM 3266 - Page 159

164
Ripple
% SUBDIVat
maximum
Noise
Vt
SUBDIV
at maximum
Microscopy
%
SUBDIV
at maximum
Converter
interference
%
SUBDIV
at
maximum
Instability
of the
trace
%
SUBDIV
at maximum
Parasitic
Z
modulation
must
not
be
visible
3.4.14.
Effect
of the
mains
voltage
variations
-
Depress
push-button
CHOP
of the
display-mode
controls
(SI
)
-
Depress
push-button
MAIN
TB of
the
X
deflection
controls
(S2)
—
Pull
the
TB
MAGN
switch
to xIO
—
Set
the
m.t.b.
TIM
E/D
IV
switch to
2 ms
and its
vernier
to
CAL
—
Set
the
d.t.b. TIME/DIV
switch
to
OFF
—
Depress
push-button
AUTO of
the
trigger-mode
controls
—
Set
both
AMPL switches
to
0.5 V/DIV
and their
verniers
to CAL
—
Depress
push-buttons
AC of the
signal-coupling
controls
-
Interconnect
the
CAL socket
and
inputs
A and
B
-
Vary the
mains
voltage
by.+ and
-
10
%
-
Check
that neither
trace
height
nor trace
width
changes
and that the
briliance
remains
the
same
3.4.15.
Horizontal
amplifier
3.4.15.1.
Bandwidth
—
Depress
push-button
B of the
display-mode
controls
(SI
)
-
Depress
push-button EXT
X DEFL
of the X deflection
controls
(S2)
—
Push the
TB
MAGN switch
to x1
—
Depress
push-button
A
of
the
m.t.b. trigger-source
controls
(S22)
—
Apply
a
sine-wave voltage
of
3 Vp.p, frequency
2 kHz,
to
the
channel
A
input
—
Check
that the
trace width
is
6
DIV
—
Increase
the frequency
of the input
signal
to 2
MHz
—
Check
that the trace width
is at least
4,2
DIV
3. 4. 15.2. Phase di
fference
—
Depress push-button
CHOP of the
display-mode controls
(SI
)
-
Push the Y
POSITION controls
to
NORMAL
—
Set both
AMPL
switches
to 5
mV/DIV
and their verniers
to
CAL
—
Depress push-buttons DC
of
the signal-coupling
controls
—
Depress
push-button
EXT X
DEFL of
the X deflection controls
(S2)
—
Depress
push-button A (B) of the m.t.b. trigger-source
controls
(S22)
—
Apply a sine-wave
voltage of
30
mVp.p, frequency
100 kHz, to
both
input A and B
—
Check that the phase
difference
does not exceed
3
°
(see
Fig.
3.28.)
in which
£
equals the
sine of
the
phase
error
angle.
A