Appendix
B-2230
Operators
A:
Flow control must
be
used when sending waveform
A:
The data channel for source
and
target for waveform
data to the oscilloscope at the higher baud rates. That
transfers
is
designated using the REFERENCE
is because the input data buffer
is
only 160 characters WAVEFORM commands
(see
DATa CHAnnel). Either
long and it fills up before the processor is ready to channel of the acquisition or Save Ref memory may
handle the input. Because
of
the nature of binary
be
retrieved from the oscilloscope. Waveform data
data, flow control
can
not
be
used to reliably send or
may
be
sent to either channel
of
a targetted Save Ref
receive binary-encoded curve data. Use either
HEX
or
memory
(see
DATa TARget).
ASCII encoding instead. HEX-coded waveform data
requires fewer characters to
be
transferred than
Q:
What
is
the purpose of the external clock?
ASCII-coded waveform data,
and
therefore is faster
than ASCII format. Also, parity must
be
disabled with
the PARAMETERS switch setting for binary data
A:
The external clock
can
be
used to acquire signals that
transfers. That setting has to
be
made before the
change too slowly for the normal calibrated SEC/DIV
instrument is turned
on
since power-on
is
the only
settings (for example, one sample every hour).
time the switch
is
read.
Another use is to synchronize the 2230
so
that
samples are done
on
selected events.
Q:
What is the size of the oscilloscope's data output
buffer?
Q:
Can
you re-arm Single Sweep via the communication
option?
A:
The output buffer is about 1,000 characters.
A:
The Single Sweep function may
be
armed using the
Q:
Why do I sometimes get
bad
curve data when I
SGLswp ARM command. Single Sweep may also be
operate the
DSO
in
the Repetitive Store Mode?
queried to determine the state
of
the Single Sweep
function (ARM or
DONE).
A:
This problem is caused by not allowing enough
Q:
What
is
the maximum sensitivity
in
digital storage?
sweeps to occur to fill the entire waveform record.
Repetitive Store Mode (random equivalent-time
sampling) depends
on
the probability
of
filling the
A:
It is 2 mV/division, the same as
in
nonstore mode.
waveform record
in
a specified number of sweeps.
The more sweeps that are used to sample
an
input
Can
I compress, expand, or reposition the stored
signal, the more probable it is that the waveform
Q:
record will
be
filled when the waveform
is
asked to
be
waveforms?
--
transferred. If you receive
bad
curve data, you must
allow more sweeps to occur before requesting the
A:
The 2230 has commands for reformatting a target
waveform from the oscilloscope.
reference waveform; the 2220
and
2221
do not.
One way to do this
is
to set the number of sweeps
Q:
What
is
the maximum expansion/compression factor
(via either the oscilloscope's menu controls or a
for stored waveforms with the 2230?
command message) to a value several times larger
than the number
of
sweeps needed for a 50%
probability of filling the record
(see
Controls,
A:
Vertically, the reformat target waveforms may
be
Connectors,
and
Indicators-Section 3 of the expanded or compressed by a factor
of
ten from their
Operators manual). Also, you can set
ROS
and
OPC
acquired VOL TS/DIV setting. Horizontally, the X10
on.
Then, when the specified number of sweeps have
Magnification feature may
be
turned
on
for the
been
acquired, the oscilloscope will issue a single
reformat target waveforms.
SRO (service request). When the controller software
determines that
an
the end-of-acquisition OPC state
Q:
Can
I return a reformatted waveform back to its
caused the service request, it
can
request the
curve data.
original settings?
Q:
When operating
in
ALT or CHOP Vertical Mode, how
A:
Yes.
Query the BASegain to determine the acquired
do I designate from which channel of the acquisition
volts/div setting
and
set the VGAin to that setting. To
or reference memory the waveform data
is
retrieved?
return to the original vertical position, set VPOsition to
How do I designate
in
which channel
of
a reference
0;
turn HMag off to regain the acquired sec/div
memory the waveform data
is
stored when sending
setting.
waveforms to the oscilloscope?
B-18
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