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TDS 310, TDS 320 & TDS 350 Programmer Manual
2Ć23
Waveform Data/Record Lengths
You can transfer multiple points for each waveform record. You can transfer a
portion of the waveform or you can transfer the entire record. The DATa:STARt
and DATa:STOP commands let you specify the first and last data points of the
waveform record.
When transferring data into the oscilloscope you must specify the location of
the first data point within the waveform record. For example, when
DATa:STARt is set to 1, data points will be stored starting with the first point in
the record, and when DATa:STARt is set to 500, data will be stored starting at
the 500
th
point in the record. DATa:STOP will be ignored when transferring
data into the oscilloscope as the oscilloscope will stop reading data when
there is no more data to read or when the record length has been reached.
When transferring data from the oscilloscope you must specify the first and
last data points in the waveform record. Setting DATa:STARt to 1 and
DATa:STOP to the record length always returns the entire waveform.
Waveform Data Locations and Memory Allocation
The DATa:SOUrce command specifies the location of the data when transferĆ
ring waveforms from the oscilloscope. You can transfer multiple waveforms at
one time by specifying more than one source.
You can transfer only one waveform to the oscilloscope at a time. Waveforms
sent to the oscilloscope are always stored in one of the two reference
memory locations. You specify the reference memory location with the
DATa:DESTination command. The waveform should be 1000 data points in
length.
NOTE
The TDS 310, TDS 320, and TDS 350 accept waveforms that are
v1000 data points long. The oscilloscope will truncate waveforms
larger than 1000 data points.
Waveform Preamble
Each waveform that is transferred has an associated waveform preamble that
contains information such as the horizontal scale, vertical scale, and other
settings in place when the waveform was created. Refer to the WFMPre
commands starting on page 2Ć164 for more information about the waveform
preamble.
Scaling Waveform Data
Once the oscilloscope has transferred the waveform data to the controller, the
oscilloscope converts the waveform data points into voltage values for analyĆ
sis using information from the waveform preamble.