Keithley SourceMeter 2600 Series Reference Manual page 277

Series 2600 System SourceMeters Reference Manual
Functions and attributes
Commands can be function based or attribute based.
Functions
Function based commands are used to control actions or activities. For example,
performing a voltage measurement is a function (action) of an SMU. A function
based command is not necessarily directly related to a Series 2600 operation. For
example, the
Each function consists of a function name followed by a set of parenthesis (
the function does not have a parameter, the parenthesis set is left empty.
Examples:
digio.writeport(15)
digio.writebit(3, 0)
smua.reset()
digio.readport()
The results of a function call are used by assigning the return values to variables
and accessing those variables. The following code will measure SMU A voltage
and return the reading:
reading = smua.measure.v()
print(reading)
Output:
The above output indicates that the voltage reading is 2.36V.
For a function that returns one value, the function call can be used in an
expression. For example:
if smua.measure.v() > 5 then
...
end
Attributes
An attribute is a characteristic of an instrument feature or operation. For example,
some characteristics of an SMU source include the source function, range and
output level.
Assigning a value to an attribute
An attribute-based command can be used to assign a new value to an attribute.
For many attributes, the value can be in the form of a discrete number or a
predefined identifier. For example, filter type is an attribute. The moving average
filter is selected by assigning the attribute to either of the following values:
or
0 smuX.FILTER_MOVING_AVG
function will logically AND two numbers.
bit.bitand
2.360000e+00
Return to
Instrument Control Library 12-3
Sets digital I/O lines 1, 2, 3 and 4 high.
Sets line 3 low (0).
Returns SMU A to its default settings.
Reads the digital I/O port.
.
Section 12 topics 2600S-901-01 Rev. A / May 2006
). If
()