Keithley SourceMeter 2600 Series Reference Manual page 59

Series 2600 System SourceMeters Reference Manual
Programming overview
What is a chunk?
A chunk is a single programming statement or a sequence of statements that are
executed sequentially. There are non-scripted chunks and scripted chunks.
Single statement chunk – The following programming statement is a chunk:
print ("This is a chunk")
When the above chunk is executed, it returns the following string:
This is a chunk
Multiple statement chunk – A chunk can also contain multiple statements. Each
statement in the line of code is to be separated by whitespace. The following
chunk contains two statements:
print ("This is a chunk") print ("that has two statements")
When the above chunk is executed, the two statements are executed sequentially
and the following strings are returned:
This is a chunk
that has two statements
Multiple chunks – The following two lines of code are two chunks. The first chunk
sets the source level of SMU A to 1V and the second chunk turns the output on.
smua.source.levelv = 1
smua.source.output = smua.OUTPUT_ON
Scripted chunk – In a script environment, the chunk is the entire listing of test
programming code. If the two statements in the above example were created as a
script, then those two lines of code would be considered one chunk. See the topic
below,
What is a script?
The Series 2600 utilizes a Test Script Processor (TSP) to process and run
individual chunks or programs called scripts. A script is a collection of instrument
control commands and programming statements.
how to create (and load) a script named "test." When this script is run, the
message "This is a test" will be displayed on the Series 2600 and sent to the PC.
As shown, a script is made up of a chunk of programming code that is framed by
shell commands. The first shell command in
"test." The last shell command marks the end of the script.
The chunk in
executed, the test messages will be sent and displayed. The following command
executes the chunk:
"What is a script?"
Figure 2-1 consists of three lines of code. When the chunk is
test()
Return to
TSP Programming Fundamentals 2-7
Figure 2-1
Figure 2-1
Section 2 topics 2600S-901-01 Rev. A / May 2006
shows an example of
loads the script named