Tektronix DSA8300, Programmer'S Manual

Page: 61 / 455

Command Groups
Waveform Data and 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. You can use the
DATa:STARt and DATa:STOP commands to specify the
fi rst and last data points
of the waveform record. The instrument supports record lengths of 50, 100, 250,
500, 1000, 2000, 4000, 8000, and 16000 samples. The maximum record length
for mag view waveforms is 4000 points.
When transferring data into the instrument, you must fi rst specify the record
length of the destination waveform record. To specify the record length, use
the WFMInpre:NR_Pt command. Next, specify the
fi rst data point within the
waveform record. For example, when you set DATa:STARt to 1, data points will
be stored starting with the
fi rst point in the record. The instrument will ignore the
value set by DATa:STOP when reading in data. It will stop reading in data when
there is no more data to read, or when it has reached the speci
fi ed record length.
When transferring data from the instrument, you must specify the fi rst and last
data points in the waveform record. Setting DATa:STARt to 1 and DATa:STOP to
the record length will always return the entire waveform.
Waveform Data Locations
and Memory Allocation
The DATa:SOUrce and DATa:TIMebase commands specify the waveform source
and waveform timebase when transferring a waveform from the instrument. You
can only transfer one waveform at a time.
Waveforms sent to the instrument are always stored in one of the eight reference
memory locations. You use the DATa:DESTination command to specify a
reference memory location.
Waveform Preamble
Each waveform that you transfer has an associated waveform preamble that
contains information such as the horizontal scale, the vertical scale, and other
settings in effect when the waveform was created. The values returned by the
WFMOutpre query commands are set by the previous curve query. Therefore,
to have a valid set of preamble and data, you must perform a CURVe? query
followed by a WFMOutpre? query. Refer to the individual WFMInpre and
WFMOutpre commands for more information.
DSA8300 Programmer Manual 2-45