Keithley 2461 Reference Manual

Model 2461
Interactive SourceMeter® Instrument Reference Manual Section 7:
Introduction to TSP operation
2461-901-01 A/November 2015 7-17
Operator precedence
Operator precedence in Lua follows the order below (from higher to lower priority):
• ^ (exponentiation)
• not, - (unary), ! (logical NOT)
• *, /, <<, >>
• +, -, &, |, ^^
• .. (concatenation)
• <, >, <=, >=, ~=, !=, ==
• and
• or
You can use parentheses to change the precedences in an expression. The concatenation ("..") and
exponentiation ("^") operators are right associative. All other binary operators are left associative. The
examples below show equivalent expressions.
Equivalent expressions
reading + offset < testValue/2+0.5
=
(reading + offset) <
((testValue/2)+0.5)
3+reading^2*4
=
3+((reading^2)*4)
Rdg < maxRdg and lastRdg <=
expectedRdg
=
(Rdg < maxRdg) and (lastRdg <=
expectedRdg)
-reading^2
=
-(reading^2)
reading^testAdjustment^2
=
reading^(testAdjustment^2)
Functions
With Lua, you can group commands and statements using the function keyword. Functions can
take zero, one, or multiple parameters, and they return zero, one, or multiple values.
You can use functions to form expressions that calculate and return a value. Functions can also act
as statements that execute specific tasks.
Functions are first-class values in Lua. That means that functions can be stored in variables, passed
as arguments to other functions, and returned as results. They can also be stored in tables.
Note that when a function is defined, it is stored in the run-time environment. Like all data that is
stored in the run-time environment, the function persists until it is removed from the run-time
environment, is overwritten, or the instrument is turned off.
Create functions using the function keyword
Functions are created with a message or in Lua code in either of the following forms:
function myFunction(parameterX) functionBody end
myFunction = function (parameterX) functionBody end

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV