D-8 Signal Processing Sequence and Data Flow Model 2701 User’s Manual
NOTE For the following discussion, a “data array” is defined as the group of data
elements that are included with each measured reading. Each data array
includes the reading, as well as the channel, reading number, units, timestamp,
and limits result (see “FORMat:ELEMents <item list>,” page 14-2, for details).
For example, assume the selected data elements to be returned by a read
command include the reading, units designator, and reading number. Now
assume a 1VDC input and the READ? command is sent to trigger two readings
and return the two data arrays. The two returned data arrays would look like
this:
+1.00000000E+00VDC, +00000RDNG#, +1.00000000E+00VDC, +00001RDNG#
(Data Array #1) (Data Array #2)
SENSe and sample buffer
The TRACe:CLEar command clears the data store, INITiate:CONTinuous OFF command
disables continuous initiation, and TRIGger:COUNt 1 configures the instrument to
perform one measurement cycle. The INIT command can then be used to initiate the
measurement cycle. When the INIT command is sent, the programmed number of
measurements (set by the SAMPle:COUNt command) are performed and the respective
data is temporarily stored in the sample buffer.
For example, if 20 measurements were performed (SAMP:COUN 20), then 20 data arrays
will be stored in the sample buffer. Data from this buffer is then routed to other enabled
data flow blocks. The data in the sample buffer remains there until data from another
measurement cycle overwrites the buffer.
NOTE The trigger count (TRIG:COUN) determines how many measurement cycles are
performed. However, only the data arrays for the last measurement cycle end up
in the sample buffer. For example, assume TRIG:COUN 2 and SAMP:COUN 20.
The first measurement cycle stores 20 data arrays in the sample buffer. The
second measurement cycle then overwrites the 20 data arrays in the sample
buffer.
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