SCPI Command Reference 17-27
Assign unit suffix
:UNITs <name>
:CALCulate[1]:MATH:UNITs <name> Specify units for user-defined calculation
Parameters <name> = Three ASCII characters enclosed in single or double quotes
Query :UNITs? Query units for user-defined calculation
Description This command is used to specify the units suffix name for a user-defined
math calculation. Use three ASCII characters for the units suffix name. If
using fewer than three characters, add spaces to the right of the units name
in the string. For example, if the units name is “Z”, send it as follows:
:calc:math:unit “Z ”
The units name can also be enclosed in single quotes as follows:
:calc:math:unit ‘Z’
Define math expression
[:EXPRession] <form> or [:DEFine] <form>
:CALCulate[1]:MATH[:EXPRession] <form> Define math formula
:CALCulate[1]:MATH[:EXPRession][:DEFine] <form> Define math formula
Parameters <form> = mathematical formula using instrument readings, numbers and
standard math operator symbols. See Description for details.
Query :MATH? Query user-defined math expression
Description Use either of these two commands to define a math formula using measure
and source readings, numeric constants, and standard math operator sym-
bols. 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 :NAME for more details.
Valid parameter names for measure and source readings include:
VOLTage Use V-Measure or V-Source reading
CURRent Use I-Measure or I-Source reading
RESistance Use ohms reading
TIME Use timestamp reading
Valid math operators and their operations are listed as follows:
+ Add
- Subtract
* Multiply
/ Divide
^ Exponent
log Logarithmic, base 10
ln Natural log
sin Sine
cos Cosine
tan Tangent
exp e
x
abs Absolute value
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