Define Math Expression - Keithley SourceMeter 2400 User Manual

18-30 SCPI Command Reference
Define math expression
[:EXPRession] <form> or [:DEFine] <form>
:CALCulate[1]:MATH[:EXPRession] <form>
:CALCulate[1]:MATH[:EXPRession][:DEFine] <form>
Parameters
<form> = mathematical formula using instrument readings, numbers
and standard math operator symbols. See "Description" for details.
Query
:MATH?
Description
Use either of these two commands to define a math formula using mea-
sure and source readings, numeric constants, and standard math operator
symbols. After the math expression is defined, it will be assigned to the
name that was created using the :NAME command and will become the
selected math expression. See
details.
Valid parameter names for measure and source readings include:
VOLTage
CURRent
RESistance
TIME
Valid math operators and their operations are listed as follows:
+
-
*
/
^
log
ln
sin
cos
tan
exp
NOTE The log and ln operations are performed on the absolute value of the specified
number. For example, log (100) = 2 and log (-100) = 2.
Expressions are evaluated according to the following precedence rules:
1.
2.
3.
4.
5.
6.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
2400 Series SourceMeter
Define math formula
Define math formula
Query user-defined math expression
"NAME <name>," page 18-24
Use V-Measure or V-Source reading
Use I-Measure or I-Source reading
Use ohms reading
Use timestamp reading
Add
Subtract
Multiply
Divide
Exponent
Logarithmic, base 10
Natural log
Sine
Cosine
Tangent
x
e
Enclosed by parentheses
Unary operators (+ and -)
^ (exponentiation)
* (multiplication) and / (division)
+ (addition) and - (subtraction)
Left to right.
®
User's Manual
for more