2400 Series SourceMeter
®
User’s Manual
Data Flow
C-3
The SENSE block represents the basic measured readings of voltage, current, and resis-
tance. If Filter is enabled, the readings will be filtered. The SENSE block also measures
time for the timestamp.
When the INITiate command is sent, the programmed number of source-measure opera-
tions are performed and the respective data is temporarily stored in the Sample Buffer. For
example, if 20 source-measure operations were performed, then 20 sets of data will be
stored in the Sample Buffer. Data from this buffer is then routed to other enabled data flow
blocks.
Assuming that all functions are enabled, the data that is output by the read commands
(FETCh?, CALC1:DATA?, CALC2:DATA?, TRACe:DATA?, and CALC3:DATA?)
depend on which data elements are selected. With all elements selected, available data will
include voltage, current and resistance readings as well as the time stamp and status infor-
mation. Note that if a measurement function is not enabled, then either the NAN (not a
number) value or the source reading will instead be used. (See
Section 18
, “
FORMat sub-
system
,” for details).
After all source-measure operations are completed, the SourceMeter returns to the idle
state. The data stored in the Sample Buffer will remain there until data from another
source-measure cycle overwrites the buffer. Data in the Sample Buffer is lost if the
SourceMeter goes to the local state (REM annunciator off).
NOTE
With no data in the Sample Buffer, the FETCh?, CALCulate1:DATA?, and
CALCulate2:DATA? commands to read data will display the message “Data
corrupt or stale.”
FETCh?
This command is used to read data stored in the Sample Buffer. If, for example, there are
20 data arrays stored in the Sample Buffer, then all 20 data arrays will be sent to the com-
puter when FETCh? is executed. Note that FETCh? does not affect data in the Sample
Buffer. Thus, subsequent executions of FETCh? acquire the same data.
The READ? command performs an INITiate and then a FETCh? The INITiate triggers a
new source-measure cycle which puts new data in the Sample Buffer. FETCh? reads that
new data. The MEASure? command places the SourceMeter in a “one-shot” source-
measure mode and then performs a READ?. See
Section 17
, “
SCPI Signal Oriented Mea-
surement Commands
,” for more information on READ? and MEASure?.
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Содержание SourceMeter 2400
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