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D-8 Signal Processing Sequence and Data Flow Model 2750 Multimeter/Switch System User’s Manual

NOTE For the following discussion, a “data array” is defined as the group of data ele-

ments 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 14-5, for details).

For example, assume the selected data elements to be returned by a read com-

mand 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 per-

form one measurement cycle. The INIT command can then be used to initiate the mea-

surement 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 mea-

surement 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 sec-

ond measurement cycle then overwrites the 20 data arrays in the sample buffer.

2750-900-01.book Page 8 Wednesday, August 3, 2011 7:56 AM

Keithley 2750 User Manual

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