158
-
Check
that the
pulse
top is
straight
within
2% and
that
the
rise time
is
as short
as
possible; if
necessary,
readjust
potentiometers
R253A
and
R254A
or
select
a different
value for
capacitors
C222
and
C223
on
the
intermediate
Y
amplifier
adjusting board
-
Increase
the
repetition
rate of
the
input
signal
to 100
kHz
—
Check
that
the
pulse
is
straight
within
2%
and
that
the
rise time
is
as short
as possible,
if
necessary,
readjust
trimmers
C221
on
the
intermediate
Y
amplifier
board
-
Select
C200
on the
intermediate
amplifier
(unit
12)
to
such
a value
(between
3p3
and
6p8)
that the
square
wave
response
is
optimal
-
Set the
generator
frequency
to
30 kHz
—
Set the
m.t.b.
controls
to obtain
a suitable,
triggered
display
-
Check
that
the top
of
the
displayed
pulse
is straight
within
2%;
if necessary
,
readjust
trimmer
C616
on the
final
Y
amplifier
board
—
Set
the
generator
frequency
to 100
kHz
—
Set the
m.t.b.
controls
to
obtain
a suitable, triggered
display
Check
that
the
top of
the
displayed
pulse
is straight
within
2%;
if necessary,
select
a
different
value
for
resistor
R646
on
the
final Y
amplifier
board
-
Check
the
square-wave
response
in positions
5 mV/DIV
and
2
mV/DIV
of
the AMPL
switch
at
input
voltages
of
30 mV
and 12
mV. The
pulse
top
aberrations
must not
exceed
2%
-
Pull
the
channel
A
Y
POSITION
control
to INVERT
—
Repeat
the checks
described
above;
the response
must
be
the
same and the
pulse
top aberrations
must
remain
within
2%
—
Depress
push-button
0 of the
channel
A signal-coupling
controls
Depress
push-button
ADD of the
display-mode
controls and check
that the response
does not
change
—
Check that the
pulse top aberrations
remain
within
±2%
—
Remove the
input
signal
3.4.
10.6.
Square-wave
response
channel
^(unit
12)
—
Depress
push-button
B of the display-mode
controls (SI
)
—
Push
the channel
A
POSITION
control to NORM position
—
Depress
push-button
DC of the channel
B
signal-coupling
controls
—
Set the
channel
B
AMPL
switch
to 10 m V/DIV
and its vernier
to
CAL
—
Set the
XMagnifier
in the XI
position
—
Depress push-button
MTB of
the X deflection
controls
(S2)
—
Depress push-button
B of the m.t.b.
trigger source-controls
(22)
—
Set
the
m.t.b. TIME/DIV switch
to a suitable value
-
Set the d.t.b. TIME/DIV
switch
to OFF
—
Apply
a square-wave voltage
of 60 mV, rise
time
1
ns, repetition rate 2
kHz,
to
channel
B input
—
Determine (for
example with the
use
of
an auxililiary potentiometer) the value
for R356 that gives
the best square wave
response.
A
resistor
with the selected value (between
1k6
and 4k7) must be
soldered
on the
unit
—
Check that
the pulse top is straight within
2% and the rise time is
as
short
as possible; if necessary
readjust
potentiometer R255B
or select
a
different value for capacitor
C324
on
the intermediate
Y
amplifier adjusting board
—
Increase the repetition
rate of the input signal
to 30
kHz
—
Put the instrument in the Magn X10
mode for
better
waveform analysis
—
Check that
the pulse top is straight within
2% and that the rise time is as short as possible; if necessary,
readjust potentiometers
R253B and R254B or select
a
different value for capacitors
C322
and
C323
on
the intermediate Y amplifier adjusting
board
—
Increase
the repetition
rate of the input signal
to
100 kHz
—
Check that
the
pulse
top is straight within
2%
and that the
rise
time is
as
short as possible;
if
necessary,
readjust
trimmers C321
(this one also affects channel
A) on
the intermediate amplifier board
—
Select
C300
on
the intermediate amplifier
(unit
12)
to
such
a
value (between
3p3
and
6p8)
that the
square wave
response
is optimal
—
Check the
square-wave response
in
position
5 mV/DIV and 2
mV/DIV
of the AMPL switch
at input
voltages
of 30 mV and 12 mV.
The pulse
top aberrations must not exceed 2%
-
Pull
the channel B POSITION
control
to
INVERT
—
Repeat the
checks described
above; the response
must be the same and the pulse top aberrations must
remain within
2%
—
Depress
push-button
O
of the
channel
B
input-coupling
controls
—
Depress push-button
ADD of the display-mode
and check that the response does
not change
—
Check that the
pulse
top aberrations remain within
±
2%
—
Remove the
input signal
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