151
3.4.
7.3.
Continue
balance
(Unit
12)
—
Depress
push-button
A (B)
of the
display-mode
controls
(SI
)
—
Depress
push-button
0 of
the
channel
A
(B)
signal-coupling
controls
—
Rotate
the
channel
A
(B)
AMPL
vernier
control
between
minimum
and
maximum
-
Check
that
the
trace
does
not
move
more
than
1 DIV
in
the
2 mV/DIV
position,
0,4 DIV
in the
5 mV/DIV
position
and
0,2
DIV
in
the
other
attenuator
positions;
if
necessary,
readjust
potentiometer R212
(R312)
on the
intermediate
amplifier
board.
34.7.4.
Balance
5
mV/div
(unit
12)
-
Depress
push-button
A
(B) of the
display-mode
controls
(SI
)
—
Depress
push-button
0
of
the
channel
A
(B) signal-coupling
controls
-
Centre
the
time-base line,
using
the
POSITION
controls
-
Check that
the
trace
does not
move
more than
1 DIV when
the AMPL switch
is
turned from
5
mV/DIV
to
10 mV/DIV
and
not more
than
0,1
DIV
in
the other
positions
except in
the
2 mV/DIV
position;
if
necessary
readjust
potentiometer
R222
(R322)
on the
intermediate
amplifier
board.
3.4.7. 5. Polarity
(Norm/Invert)
balance
(unit
12)
—
Depress
push-button
A (B) of the
display-mode
controls (SI
)
—
Depress
push-button
0
of the
channel A
(B)
signal-coupling
controls
—
Centre the
time-base line,
using
the POSITION controls
—
Set the channel
A
(B)
AMPL
switch
to
1
0
mV/DIV
—
Check that
the time-base line
does not shift more than
0,3
DIV
when
the channel
A (B) POSITION control
is pulled
to INVERT; if
necessary, readjust
potentiometer R259 (R359) on
the intermediate amplifier
board.
—
Set the
channel A (B)
AMPL
switch
to 2
mV/DIV
—
Check
that the time-base line
does not shift more
than 2
DIV,
see also section 1
.2.2.13.,
when the channel A
(B) POSITION
control is
pulled to INVERT; if necessary,
readjust potentiometer
R259
(R359) on the
intermediate
amplifier
board.
3.4.7. 6. Trigger balance main
time-base (unit
16,
unit
12)
—
Depress push-button
EXT of the m.t.b. trigger-source controls
(S22)
—
Depress push-button TRIG VIEW of the display-mode controls (SI)
—
Depress push-button HF of the m.t.b. trigger-coupling controls (S20)
—
Centre the time-base line using
the
m.t.b. LEVEL potentiometer
—
Depress push-button
DC
of the m.t.b. trigger-coupling controls (S20)
—
Check
that the time-base
line remains in the screen centre; if necessary, readjust potentiometer R729 on
the trigger
source
board
—
Depress push-button A of
the
m.t.b.
trigger-source controls
(S22)
—
Check that the time-base line remains in the
screen centre; if necessary, readjust potentiometer
R426 on
the intermediate amplifier board
—
Depress push-button
B
of the m.t.b. trigger-source
controls
(S22)
—
Check that the trace remains in the screen
centre; if necessary, readjust
potentiometer
R476
on the
intermediate amplifier board
—
Depress push-button EXT of the m.t.b. trigger-source
controls
(S22)
—
Apply a sine-wave signal of 30 mV, frequency 2
kHz,
to
the m.t.b. EXT
input
—
Adjust the m.t.b. LEVEL potentiometer for
a
triggered display
—
Check that the trace
is
written across the centre
of
the
screen; if necessary, readjust
potentiometer
R527
on
the intermediate amplifier board
—
Remove
the
input signal.
3.4. 7.
7.
Trigger balance delayed time-base (unit 12)
—
Depress
push-button DEL'D
TB
of the X
deflection controls (S2)
—
Set the MAIN
TIME/DIV switch to
.5
gs and its
vernier
to
CAL
—
Set the DEL'D
TIME/DIV switch to
.2
ps and its vernier to CAL
—
Depress push-button HF of the d.t.b. trigger-coupling controls
—
Depress push-button
A
of the display-mode
controls (SI
)
—
Set
the channel
A AMPL
switch
to 20
mV/DIV and
its vernier to CAL
—
Depress
push-button
A
of the
d.t.b.
trigger-source controls (S21
)
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