Basic Applications-2230 Operators
SA
VE REF Display
1 . Acquire the waveform to
be
used
as
a reference
using the previous "SAVE Mode Display" procedure.
2. Push
in
the SAVE
REF
push button.
3.
Push
in
one
of
the DISPLAY ON/OFF buttons. The
waveform is stored
in
the Reference MEMORY selected
by the DISPLAY ON/OFF button pushed.
4.
If the SAVE
REF
display contains the active cursor,
use the Menu to horizontally expand or compress the
SAVE
REF
display
by
a factor of
up
to 10 times, if desired.
The display is expanded horizontally
in
both directions
from the active cursor
and
is
correctly scaled for the
switch settings. A waveform acquired at 2
mV
per division
cannot be vertically expanded,
and
a waveform acquired
at
5 V per division cannot
be
vertically compressed.
5.
Push
the appropriate DISPLAY ON/OFF button
(without first pushing the SAVE
REF
button) to retrieve
and display a stored reference waveform. A new reference
waveform is saved each time the SAVE
REF
button is
pushed
and
then a DISPLAY ON/OFF button is pushed.
ACCPEAK or PEAKDET Displays
1 . Preset the instrument controls
and
obtain a baseline
display.
2.
Set the STORE/NON STORE switch to the STORE
position (button
in).
3.
Adjust the A TRIGGER LEVEL control to obtain a
stable display
of
the waveform to
be
stored. This ensures
that the trigger
and
the waveform to
be
stored are syn-
chronized, especially
on
low-repetition-rate waveforms.
4.
Select either PRETRIG ACQUISITION mode to
acquire 7/8 of the waveform before the trigger event or
POST TRIG ACQUISITION mode to acquire 7/8 of the
waveform that occurs after the trigger.
NOTE
Using the
MENU,
the trigger point can be selected to
be any point within the acquisition record.
5.
Set the WAVEFORM REFERENCE/MENU SELECT
switch to the MENU SELECT position (button out).
6-4
6.
Use the MENU SELECT switches to select
ACCPEAK or PEAKDET.
7. Set the WAVEFORM REFERENCE/MENU SELECT
switch to the WAVEFORM REFERENCE position (button
in).
A VERA GE
Mode
Display
1 . Preset the instrument controls
and
obtain a baseline
display.
2.
Set the STORE/NON STORE switch to the STORE
position (button
in).
3.
Adjust the A TRIGGER LEVEL control to obtain a
stable display of the waveform to
be
stored. This ensures
that the trigger
and
the waveform to
be
stored are syn-
chronized, especially
on
low-repetition-rate waveforms.
4.
Select either PRETRIG ACQUISITION mode to
acquire 7 /8 of the waveform before the trigger event or
POST TRIG ACQUISITION mode to acquire 7/8 of the
waveform that occurs after the trigger.
5.
Set the WAVEFORM REFERENCE/MENU SELECT
switch to the MENU SELECT position (button out).
6.
Use the MENU SELECT switches to select AVER-
AGE.
7.
Use the Menu to change the number
of
sweeps
accumulated
in
the display before the Averaging (acquisi-
tions) stop, if desired. The number
is
automatically set to
infinity at power-up.
8.
Use the Menu to change the Weight
of
the last
(current) acquisition
in
the average, if desired. The Weight
is
automatically set to 1/4 at power-up.
NOTE
The
Weight
of
the
last (current) acquisition to be
averaged into the display is selectable from 1/2 to
1 /256
in
powers
of
2.
A normalized algorithm
is
used
to display
the
averaged signal. Averaging continues
until a new mode is selected
or
SWP LIMIT is
reached. Display
of
the
average continues until a
new mode is selected. Changing a front-panel con-
trol that affects the data being acquired restarts the
averaging process; the algorithm displays the new
average
at
full amplitude.
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