Controls, Connectors, and lndicators-2230 Operators
®
3-8
AVERAGE Acquisition mode
can
be
used
for mul-
tiple record averaging. A normalized algorithm
is
used
for continuous display of the signal at full
amplitude during the averaging process. The
amplitude resolution increases with the number of
weighted acquisitions included
in
the display.
The
default
mode
for REPETITIVE Store mode
is
AVERAGE.
The
averaging weight (the number of
weighted waveform acquisitions included
in
each
average display) is
MENU
selectable. The default
average weight
is
1 /4. The number of sweeps
(SWP
LIMIT) allowed to occur before averaging
stops
is
also
MENU
selectable. The averaging
process
is
reset by changing
any
control that
causes
an
acquisition reset.
ACCPEAK Acquisition mode causes accumulation
of peaks over multiple acquisitions. The largest
maximum
and
smallest minimum samples
are
retained for
each
trigger-referenced acquisition
record.
For
20
µS
per division to 5 s per division,
hardware peak detection
is
used, updating max-
imum
and
minimum samples within
each
time
base clock period.
The
ACCPEAK display
is
reset
by changing
any
control that causes
an
acquisi-
tion reset. ACCPEAK
mode
is
valid for triggered
acquisitions only
and
is
not operational
in
untrig-
gered modes
(see
Table
3-2).
SMOOTH Processing mode reorders acquired
data for correct slope
and
interpolates the data
for drawing a smooth waveform. Smoothing looks
at
the
change
in
data point values between adja-
cent sample intervals. If the change
in
value does
not exceed certain limits, the values
are
inter-
preted
as
a continuous slope for drawing vectors
or dots. If the value change exceeds the inter-
preted "no-change" limit, the data point value
is
not modified,
and
the vectors drawn
in
the display
will show a discontinuity
in
the waveform. This
method of display of the waveform data provides
a smoothed display of the waveform, yet retains
the glitch-catching capabilities of PEAKDET or
ACCPEAK modes.
STORE
Mode A SEC/DIV Multiplier-Functions
only
in
the
STORE
mode
at SEC/DIV switch settings
of 0.1,
0.2,
and
0.5
s/div.
When
pressed
in,
the A
Sweep time
base
of these three settings
is
increased
by a factor of
10
to 1 s/div, 2 s/div,
and
5 s/div.
Releasing
the button returns the STORE mode time
base to
X1.
The
X10
MAG
control
is
still functional
on
waveforms acquired at the slow STORE mode
SEC/DIV settings.
@ Variable SEC/DIV and
4K
COMPRESS
Control-
Controls the
NON
STORE sweep time per division
and
compresses STORE mode waveform records.
@
Variable SEC/DIV-Continuously varies the
uncalibrated
NON
STORE sweep time per division
to at least four times the calibrated time per divi-
sion set by the SEC/DIV switch (increases the
slowest
NON
STORE A Sweep time per division
to at least 2
s).
The Variable SEC/DIV control
does not affect the storage time base for acquir -
ing
or displaying signals.
4K
COMPRESS-If the Variable SEC/DIV control
is
rotated out of the CAL detent position during
waveform acquisitions or SAVE
mode,
a 4K
record
is
compressed
by
a factor of four (4K
COMPRESS) to display the acquired data
in
one
display window. For 4K COMPRESS the
SEC/DIV is further multiplied
by
4.
In
PEAKDET
or ACCPEAK acquisition modes, peaks are
acquired but not displayed when 4K COMPRESS
is
selected.
X10 Magnifier
Switch-Magnifies
the
NON
STORE
displays or expands the STORE acquisition
and
SAVE waveform displays
by
10 times. STORE mode
displays
are
expanded
when
the Variable SEC/DIV
knob
is
pulled to the out position (X10
PULL).
The
SEC/DIV
scale
factor readouts
are
adjusted to
correspond to the correct SEC/DIV of the displayed
waveform (either
NON
STORE or
STORE).
Magnification of the
NON
STORE
displays occurs
around the center vertical graticule division; STORE
mode displays
are
expanded around the active CUR-
SOR.
The
display window for STORE
mode
X10
expanded waveforms
may
be
positioned using the
CURSORS Control to view
any
one-window portion
of the acquisition record.
@ HORIZONTAL
MODE
Switch-Determines the
operating
mode
of the horizontal deflection system
in
both
NON
STORE
and
STORE.
For STORE
mode,
the switch selects the acquisition time base
and
storage
mode
(either A SEC/DIV or B SEC/DIV).
A-Only
the A Sweep
is
displayed.
NON
STORE
time
base
and
STORE
acquisitions
are
controlled
by
the A SEC/DIV switch.
The
A SEC/DIV switch
setting
is
displayed
on
the crt readout.
BOTH-Alternates the
NON
STORE
display
between the A Intensified
and
B
Delayed
Sweeps.
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