acquiring
and
viewing both channel input signals
at sweep rates of 0.5
ms
per division
and
faster.
Channel 1
and
Channel 2 STORE mode signals
are acquired on alternate acquisition cycles at
one-half the sampling rate of a single-channel
acquisition.
CHOP-Switches
the nonstore display between
the Channel 1
and
Channel 2 vertical input sig-
nals during the sweep. The chopped switching
rate for
NON
STORE mode (CHOP frequency)
is
approximately 500 kHz. Chopped STORE mode
signals are acquired
on
alternate time-base clock
cycles with each channel being acquired at one-
half the sampling rate of a single-channel acquisi-
tion.
In
STORE mode at sweep speeds of 5 µs
per division or faster,
CHOP
becomes ALT mode.
BW
LIMIT
Switch-When
pressed
in
while
in
NON
STORE mode, the bandwidth of the vertical
amplifier system
and
the A Trigger system
is
lim-
ited to approximately
20
MHz. This reduces
interference from unwanted high-frequency sig-
nals when viewing low-frequency signals.
In
STORE mode, pressing
in
the
BW
LIMIT switch
reduces only the trigger bandwidth. Press the
switch a second time to release the switch
and
regain
full
bandwidth.
X-Y
Switch-Automatically selects X-Y mode
when pressed
in.
The
CH
1 input signal provides
- - horizontal deflection for X-Y displays,
and
the
CH
2 input signal provides vertical deflection.
In
STORE mode,
CH
1
and
CH
2 signals are
acquired
in
a chopped manner with no more than
100
ns
between corresponding sample points
on
opposite channels, with the
CH
1 signal being
sampled before the
CH
2 signal. The sampling
mode
and
sampling rate
are
controlled
by
the A
or
the B SEC/DIV switch (depending
on
the Hor-
izontal Display mode). The
X-Y
waveform
is
acquired
in
SAMPLING mode
and
displayed with
dots. Set the SEC/DIV controls to obtain at least
10 samples per cycle of the highest frequency
component
in
both the X
and
the Y input signals.
The sampling rate
is
determined by the formula
50/(SEC/DIV)
Hz.
@ Vertical POSITION Controls-Control the vertical
display position of the
CH
1
and
CH
2 signals.
In
STORE mode, the controls determine the vertical
position of displayed waveforms during acquisition
and
in
SAVE mode. Any portions of a signal being
acquired that are outside the dynamic range of the
AID converter
are
blanked when positioned
on
screen.
The
Vertical POSITION controls
can
also
reposition a vertically expanded SA
VE
waveform so
that portions of the waveform outside the graticule
area
can
be
observed.
Controls, Connectors, and
lndicators-2230
Operators
In
NON
STORE X-Y
mode,
the
CH
2 POSITION
con-
trol
vertically
positions
the
display,
the
horizontal
POSITION
control
positions
the
display
horizontally,
and
the
CH
1 POSITION control
is
not active. In
STORE mode, both the
CH
1 POSITION control
and
the Horizontal POSITION control affect the horizon-
tal position of the displayed waveform.
@ A/B SWP SEP Control (NON STORE
only)-While
in
NON
STORE mode, vertically positions the B
Sweep trace with respect to the A Sweep trace
when the HORIZONTAL MODE
is
BOTH.
PRB
ADJ
Connector-Provides
an
approximately
0.5
V,
negative-going, square-wave voltage (at
approximately 1 kHz) for compensating voltage
probes
and
checking the operation of the
oscilloscope's vertical system. It
is
not intended to
verify the accuracy of the vertical gain or the hor-
izontal time-base circuitry.
@ GND
Connector-Provides
an
auxiliary ground con-
nection directly to the instrument chassis via a
banana-tip jack.
HORIZONTAL
Refer to Figure 3-3 for location of items
20
through
26.
@ SEC/DIV
Switches-Determine
the SEC/DIV setting
for both the
NON
STORE sweeps
and
the STORE
mode waveform acquisitions. To obtain calibrated A
and
B
NON
STORE sweeps, the Variable SEC/DIV
control must
be
in
the CAL detent.
In
STORE mode, the SEC/DIV switches determine
the default acquisition
and
display modes, set the
sampling rate,
and
establish the seconds-per-division
scale factor of the displayed waveforms.
The
SEC/DIV parameters displayed
on
the crt readout
are for the waveforms identified
by
CURSORS.
Table 3-2 lists the default Storage
and
Display
modes with respect to the SEC/DIV switch setting
and
the selected Trigger mode.
The
default modes
may
be
changed
by
selecting the Acq Mode Setup
Table
in
the
menu.
Waveforms of SCAN,
and
ROLL
displays
are
updated one data point at a time.
All
data points of a RECORD display
are
updated at the
same time (total record replacement).
3-5
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