36
2.2.9.
Operation
of
the
storage
functions
MEMORY
OFF
mode
WRITE
mode
FAST
mode
If
the
STORE
and
WRITE
buttons
are
depressed
the
storage
function
is
switched
off
and
the
instrument
functions
as
a
normal
oscilloscope.
In
this
mode,
the
INTENS
knob
controls
the
brightness of
the displayed
waveform.
The
FOCUS
knob
is used
to
obtain
maximum
sharpness
of the
display.
Blocking
the
memory
system. If
the
instrument
is waiting
in
the FAST
mode
(after the
ERASE
cycle has
ended) for
the
time-base
sweep,
the
instrument
can only
be put in
the
MEMORY
OFF
mode and
not in
the WRITE
or
STORE
mode.
The
instrument
can
be put in
the WRITE
or STORE
mode if
the
complete
erase/write
cycle
of the FAST
mode
has been
completed:
in other words,
only
after
the time-base
has
run
and the image
transfer
has occurred.
WARNING:
In the MEMORY
OFF
position,
especially
in
the EXT
X DEFL
mode, excessive
intensity for
a
prolonged
period
may damage
the c.r.t.
The
waveform is
recorded with
normal writing
speed. The
position of
the INTENS control
determines
the intensity
of
the waveform
that
is written on
the storage layer of the
c.r.t.
Depending on the position
of
the
PERSISTENCE
control,
a rapidly vanishing
picture
will be written on
a
green background
(control
entirely counter-clockwise)
or
a
slowly
vanishing trace
on a black background
(control
adjacent
to its first clockwise
stop). The PERSISTENCE
can
be
set to suppress
any
flickering
when
displaying a low
frequency signal.
For a signal with
a
low
repetition
rate and a short rise-time
the PERSISTENCE
can be
set
so
up
to
fill
up the
trace
in
order to obtain
a
clear
and
steady display.
The writing speed can
be increased
by a factor of approximate-
ly 10
by putting the
PERSISTENCE
control in the
MAX
position.
The waveform
is recorded with high
writing
speed.
The
position of the INTENS control
determines
the intensity of
the waveform that is written
on the
storage layer of the c.r.t.
This
mode is
a
single
shot mode. If
the VIEW TIME control
is out of
the
MAX
position
the following
cycle is
repetitively
performed.
The stored picture is
ereased and after that
another picture
is written when
the time-base is triggered.
After
an adjustable viewing time the following cycle starts
with the erasure of the
c.r.t. screen.
The viewing time is
adjustable
with the
VIEW
TIME
control between
3
seconds
(control
entirely
counter-clockwise) and 8 seconds (control
adjacent
to its first clockwise stop).
If
the
VI
EW TIME knob
is switched
to the
MAX
position,
recording of a new picture only
occurs after
the
ERASE
button has been depressed. In
this mode
it is also possible
to transfer
the instrument
to the STORE mode after the
time-base has run and
a new picture is written.
For this
function
proceed as follows:
put
the instrument
in
the FAST
mode and ERASE
the
picture.
After
this, the
instrument
will wait for
a
trigger
signal. Now depress the
STORE
pushbutton
and the
instrument will transfer
to the
STORE
mode after
the new
picture
is written. To obtain
a
good
quality picture,
the waiting
period for the trigger
signal
must
not exceed
one minute.
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