Operating Information—2230 Service
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 ns' 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 ACCPE1AK 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 2-2).
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.
(2l) 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 XI. The XI0 MAG control is still functional
on waveforms acquired at the slow STORE mode
SEC/DIV settings.
(
52
) Variable SEC/DIV and 4K COMPRESS C ontrol-
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
dices not affect the storage time base for acquir
ing or displaying signals.
4I< 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.
(
53
) 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 (XI0 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 X I0
expanded waveforms may be positioned using the
CURSORS Control to view any one-window portion
of the acquisition record.
(24) 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.
2-11
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