Basic Applications-2230 Operators
6.
Use
the CURSORS control to move the active cur-
sor to the minimum level of the waveform.
7.
Push
the SELECT C1/C2 button to select the other
cursor,
and
use
the CURSORS control to move the active
cursor to the maximum level of the waveform.
8.
Set
the
VOL TS/DIV
switch
and
the
VOL TS/DIV
Variable control (or
signal
amplitude)
for
a
tN
readout
of
100%.
NOTE
The
SA
VE
ACQUISITION mode button may be
pressed
in
at
this time to save the acquired
waveform for as long as desired. Voltage and time
measurements may be made on the
SA
VE
waveform
with less trigger jitter.
9.
Use
the CURSORS control to move the active cur-
sor down the waveform's leading edge until the
AV
readout
is
90%.
10. Push the SELECT C1/C2 button to select the other
cursor,
and
use
the CURSORS control to move the active
cursor
up
the waveform's leading edge until the
AV
readout
is
80%
(see
Figure 6-5).
6V1
=80.
0%
f
/':,
=10
.00rs
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l
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. <
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•!\,.•.~-
I
90
/~r---+-....
CURSOR
-
...
AT
90%
GRATIC
ULE
I
j
I
ACTIVE
-
CURSOR
-
-:-
AT
10%
GRATICULE
rYI
10
..
-
-
I
......
..........
0¾·
.
I
2V
SAM
l=>LE
5
1S
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4998-18
Figure 6-5. Rise time, cursor method.
11
.
Read
the pulse rise time from the crt delta time
readout.
6-8
Waveform Comparison
Repeated comparisons of newly acquired signals with a
reference signal for amplitude, timing, or pulse-shaped
analysis may
be
easily
and
accurately made using the
SAVE
REF
function of the instrument.
1.
Preset instrument controls
and
obtain a baseline
trace.
2.
Set the STORE/NON STORE switch to the STORE
position (button
in).
3.
Select a VOL TS/DIV switch setting that gives the
desired vertical deflection.
4.
Set the A SEC/DIV switch to display the reference
signal with the desired sweep rate.
5.
Push
in
the SAVE
REF
button.
6.
Push
in
the MEMORY 1 button to store the refer-
ence waveform into reference memory
1.
7.
Acquire the waveform that
is
to
be
compared with - -
the reference waveform.
NOTE
A stored reference will remain displayed until the
DISPLAY ON/OFF button for the stored reference is
again pushed while in WAVEFORM REFERENCE
mode. Switching the instrument to NON STORE
removes stored waveforms from the display,
but
the
saved reference waveforms remain
in
the digital
storage memory for use upon return to a storage
mode. A new reference waveform is saved when the
SA
VE
REF button and then a DISPLAY ON/OFF
button are pushed while
in
WAVEFORM REFER-
ENCE mode .
8.
Use
the selected channel's Vertical POSITION con-
trol to overlay the newly acquired waveform
on
the refer-
ence waveform for making the comparison
(see
Figure
6-6). The· vertical deflection
and
sweep rate remain cali-
brated to allow direct measurement from the graticule, or
cursors may
be
used to determine voltage or time
differences.
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