Keysight B2961A/B2962A SCPI Command Reference, Edition 6 4- 5
Subsystem Commands
CALCulate Subsystem
Parameter definition Definition of a math expression. Up to 256 ASCII characters.
Parameter data type is Expr. The expression must be enclosed
by parentheses. For example, definition=(SOUR2/CURR2).
Maximum of 32 math expressions can be defined including the
predefined math expressions.
Query response definition <newline>
definition returns the definition of the math expression currently selected. For
example, definition returns (SOUR2/CURR2). Response data type is Expr.
Example :CALC:MATH:EXPR:NAME “Expression_for_ch1”
:CALC:MATH:EXPR:DEF
((CURR[1]-CURR[0])*(RES[1]-RES[0]))
:CALC:MATH?
Resources used in the expressions
The following resources can be used in user-defined math expressions.
• Reserved variables
The variables listed in Table 4-1 are reserved for reading the channel output or
measurement data.
Scalar variable is used for spot measurement data.
Vector (array) variable is used for sweep measurement data.
• Math operators
The following operators are available.
• Arithmetic operators: +, -, *, /, ^, see Table 4-2
• Elementary functions: ln, log, sin, cos, tan, exp
The functions log and ln perform the operation after calculating the absolute
value. So if a negative value is specified, they do not result in an error, but
calculate as if a positive value was specified. For example, log(-10) results in
log(10)=1.
• Numeric value
Decimal (0 to 4294967294, 4294967295 indicates -1), binary (32 bit, 0 to
0b11111111111111111111111111111111), or hexadecimal (0 to 0xFFFFFFFF).
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