Controls, Connectors,
and
lndicators-2230 Operators
STORAGE CONTROLS
Refer
to
Figure 3-5 for location of items
39
through 42.
@
STORE/NON
STORE
Switch-Selects
either the
NON
STORE or the STORE waveforms for display.
The STORE acquisition system
is
turned off while
NON
STORE
is
selected, keeping the last-acquired
STORE waveform
in
memory. Selects
NON
STORE
when out
and
STORE when pressed
in.
@ ACQUISITION
Controls-Determine
the method of
acquiring
and
displaying the acquired STORE
waveform.
1K/4K Switch (Record
Length)-Selects
an
acquisition record length of either
one
screen
(1
K)
or four screens
(4K).
Pressing the button
in
selects 1 K record length,
and
pressing it again to
release it returns to 4K record length acquisitions.
In
either case, the displayed waveform has 100
data points per horizontal graticule division
(50
if
two
channels are acquired).
When a waveform
is
acquired using the B time
base, switching between record lengths also
changes the delay time position setting
by
the
same factor of four. The B DELAY TIME POSI-
TION control must
be
repositioned to obtain the
same delay.
When the 4K record length
is
selected, a one-
screen
(1
K)
window of the acquisition
is
displayed,
and
a bar graph
is
used to indicate the
position of the displayed window within the
record. Turn the CURSORS Position control to
move the display window to any position within
the record.
The 4K acquisition record
can
be
compressed to
a length of 1 K
by
rotating the Variable SEC/DIV
control out of the CAL detent position. The
SEC/DIV readout
is
adjusted to reflect the correct
time per division of the displayed waveform. The
acquisition record may
be
magnified using the
X10 Magnifier.
PRETRIG/POST TRIG Switch-Positions the
trigger point for acquisitions either near the end
(PRETRIG) or the beginning (POST TRIG) of the
waveform. A T
is
displayed
on
the waveform
to
indicate the trigger point. Pressing the button
in
sets the trigger point to PRETRIG; out
is
the
POST TRIG position. Other trigger positions may
be
selected
via
the menu.
ROLL/SCAN
Switch-Selects
either ROLL or
SCAN acquisition
and
display mode. When
pressed
in
(ROLL mode), at SEC/DIV switch set-
tings from
0.1
s per division to 5 s per division the
triggers are disabled for NORM
and
P-P
AUTO
Trigger modes,
and
the signals are continuously
acquired
and
displayed. The waveform display
scrolls from right to left across the crt with the
latest samples appearing at the right edge of the
crt. At SEC/DIV switch settings from
0.1
s per
division to 5 s per division
in
SGL SWP Trigger
mode, SCAN/ROLL/SCAN storage mode
is
selected.
At SEC/DIV switch settings of 0.05 s per division
and
faster, the ROLL/SCAN switch
is
not tune- - -
tional,
and
waveform samples require a triggering
event to complete the acquisition before the
display
is
updated.
When the ROLL/SCAN switch
is
in
the out posi-
tion (SCAN mode), the A TRIGGER Mode con-
trols
are
functional. For NORM Trigger mode, the
pretrigger waveform
is
updated
by
the trigger
and
the post trigger scans from the trigger position to
the right. For SGL SWP, SCAN mode
is
overrid-
den by SCAN/ROLL/SCAN. Triggers are disabled
in
P-P
AUTO
and
TV
FIELD Trigger modes.
STORE
•
•:
11011
STORE
4998-08
Figure 3-5. Storage controls.
3-12
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