Philips PM 3266 - 3.4.8. Time-base generators

153
—
Pull
the
TB
MAGN
switch
to xIO
-
Check
that
the xIO
pilot
lamp
lights
up
-
Change
the
repetition
rate
of
the
input
voltage
to
.1
/is
—
Check
that the
centre
8 cycles
have
a
total
width of
8
DIV;
if
necessary,
readjust
potentiometer
R1706
on
the
time-base
board
—
Push
the
TB
MAGN
switch
to x1
-
Set the
m.t.b.
TIME/DIV
switch
to
.1 /ts
—
Check
that
the
centre
8
cycles
have
a total
width of
8 DIV; if
necessary,
readjust
trimmer
capacitor
C916
on
the
time-base
board
—
Check
that
the
other
positions
of the
m.t.b.
TIME/DIV
switch,
using
the
appropriate
input
signals;
tolerance ±
2
% at an
ambient
temperature
of
20
to
-t30
°C.
-
Check
that
the
control range
of the
m.t.b.
TIME/DIV
vernier
control
is 1
:2,6
to
1
:3,5 and that
the pilot
lamp
UNCAL
lights
up as
soon
as the vernier
is
out of its
CAL
position.
3.4.8.2.
Delayed
time-base time coefficients
(unit
8)
—
Depress
push-button
A
of
the
display-mode
controls
(SI
)
-
Depress
push-button
DEL'D
TB of the
X deflection controls
(S2)
—
Depress
push-button
AUTO of the
trigger-mode
controls
(S8)
—
Depress
push-button
DC of the
d.t.b. trigger-coupling
controls
—
Rotate the
DELAY TIME
control (R1
)
fully
anti-clockwise (minimum
delay
time)
—
Push the
TB
MAGN switch
to x1
-
Depress
push-button
A of the
d.t.b. trigger-source
controls
(S21
)
—
Set the
m.t.b. TIME/DIV
switch
to 2
ms
and its
vernier
to CAL
—
Set the
d.t.b. TIME/DIV switch
to
1 ms and
its
vernier
to CAL
—
Check that
the time-base
UNCAL
lamp
is
off
—
Apply
a
time-marker
signal of
600 mV,
repetition rate 1 ms,
to
the
channel
A input
—
Set the channel
A AMPL
switch
to .1 V/DIV and its vernier to
CAL
—
Adjust the
d.t.b. LEVEL control
for
a
stationnary display
—
Check
that the
centre 8 cycles have
a
total width of
8
DIV;
if
necessary,
readjust
potentiometer R1326
on the time-base
board
—
Set the m.t.b. TIME/DIV
switch
to 10
ms
—
Set the
d.t.b. TIME/DIV switch
to 5
ms
—
Change
the repetition rate
of the input signal
to 5
ms
—
Check
that the centre
8
cycles have
a total
width of
8 DIV; if necessary, readjust
potentiometer R1318
on the
time-base
board
—
Set the
m.t.b.
TIME/DIV switch
to
2
/ns
—
Set
the
d.t.b. TIME/DIV
switch
to
1
jus
—
Change the
repetition rate of the input signal
to
1
jus
—
Check that
the centre
8
cycles have
a total
width
of 8 DIV;
if
necessary, readjust
potentiometer R1321
on
the time-base board
—
Set the m.t.b. TIME/DIV
switch to
.2
/us
—
Set the
d.t.b. TIME/DIV switch to
.1
/us
—
Change the repetition
rate of the input signal
to
.1
/us
—
Check that the
centre
8
cycles have
a
total width of
8
DIV; if necessary,
readjust trimmer capacitor
Cl
311
on
the
time-base board
—
Check the
sweep times in all other positions of the d.t.b. TIME/DIV switch;
tolerance
±
2%
in temperature
range
-t20
...
+30
°C. Keep during this check
the
DELAY TIME
control fully
anti-clockwise
and the
m.t.b.
TIME/DIV
switch
one position slower
than the d.t.b. TIME/DIV switch.
—
Check that the control range of the
d.t.b.
TIME/DIV vernier control
is 1
:2,6
to
1
:3,5
and that
the
pilot
lamp UNCAL lights up
as soon as
the vernier
is out of its CAL position.
3.4. 8.3. Delay
time (unit
9)
—
Depress push-button
A
of the
display-mode controls (SI
)
—
Depress push-button DC of
the channel A signal-coupling controls
—
Depress
push-button
MAIN
TB of the X defleclion
controls
(S2)
—
Depress
push-button AUTO
of the trigger-mode controls (S8)
—
Depress
push-button A of the
m.t.b.
trigger-source
controls (S22)
—
Depress
push-button MAIN TB of the
d.t.b.
trigger-source controls
(S21
)
—
Push the
TB MAGN switch to position x1