This subsystem permits processing of measured data in numerical expression format. The operators are +, -, *, / and use of constants and data arrays are permitted.
Command tree: CALCulate<Chn>:MATH
Defines a simple mathematical relation between traces. To calculate and display the new mathematical trace, the mathematical mode must be switched on (CALCulate<Chn>:MATH:STATe ON).
This command places some restrictions on the mathematical expression and the operands. Use CALCulate<Chn>:MATH[:EXPRession]:SDEFine to define general expressions.
<Chn> |
Channel number used to identify the active trace. If unspecified the numeric suffix is set to 1.
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<expression> |
(<operand1><operator1><operand2>[<operator2><operand3>]) |
Parameters |
Operands: See list of trace
names |
*RST value |
–
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SCPI, Command Types |
Confirmed, no query. The defined expression can be queried using CALCulate<Chn>:MATH[:EXPRession]:SDEFine?
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Example: |
*RST; :CALC:MATH:MEM Copy the current state of the default trace Trc1 to a memory trace named 'Mem2[Trc1]'. The memory trace is not displayed. CALC:MATH (CH1DATA / MDATA2) Define a mathematical trace, dividing the data trace by the stored memory trace. The mathematical trace is not displayed CALC:MATH:STAT ON Display the mathematical trace instead of the active data trace.
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Defines a general mathematical relation between traces. To calculate and display the new mathematical trace, the mathematical mode must be switched on (CALCulate<Chn>:MATH:STATe ON).
<Chn> |
Channel number used to identify the active trace.
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'<string>' |
String parameter for the mathematical expression, enclosed in brackets. The string format must correspond to an allowed string in the Define Math dialog.
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Parameters |
Operands, operators and functions; see table below. |
*RST value |
–
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SCPI, Command Types |
Device-specific, command or query. This command also queries a mathematical expression defined via CALCulate<Chn>:MATH[:EXPRession][:DEFine].
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Example: |
*RST; :CALC:MATH:MEM Copy the current state of the default trace Trc1 to a memory trace named 'Mem2[Trc1]'. The memory trace is not displayed. CALC:MATH:SDEF 'Trc1 / Mem2[Trc1]' Define a mathematical trace, dividing the data trace by the stored memory trace. The mathematical trace is not displayed. CALC:MATH:STAT ON Display the mathematical trace instead of the active data trace.
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Expressions defined via CALCulate<Chn>:MATH[:EXPRession]:SDEFine may contain the following elements:
Type |
Complete List |
Description |
Operands |
<Trace name> | |
All traces and memory traces
of the active setup | |
Constants |
e, pi | |
Constants
| |
Operators |
- + , - , * , / , ^ |
Basic arithmetic operations; ^ for exponentiation |
Functions |
linMag (),
dBMag (), Arg (), Re (), Im (), log (), ln (), tan (), atan (), sin (),
asin (), cos (), acos (), |
Mathematical functions with one or two arguments |
Special Functions |
StimVal |
Current stimulus value (see description of operators for User Defined Math) |
Brackets |
( ) |
Priority of operations in complex expressions |
Defines a simple mathematical relation between the active trace and the active memory trace to calculate a new mathematical trace and displays the mathematical trace.
This command places some restrictions on the mathematical expression and the operands. Use CALCulate<Chn>:MATH[:EXPRession]:SDEFine to define general expressions.
<Chn> |
Channel number used to identify the active trace. If unspecified the numeric suffix is set to 1.
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NORMal |
Math. trace = active data trace |
*RST value |
NORMal
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SCPI, Command Types |
Confirmed, with query.
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Example: |
*RST; :CALC:MATH:MEM Copy the current state of the default trace Trc1 to a memory trace named 'Mem2[Trc1]'. The memory trace is not displayed. CALC:MATH:FUNC DIV Define a mathematical trace, dividing the data trace by the stored memory trace. The mathematical trace is displayed instead of the active data trace. CALC:MATH:STAT? The response is 1 (mathematical mode switched on, mathematical trace displayed).
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Copies the current state of the active data trace to a memory trace. If a mathematical trace is active, the data trace associated with the mathematical trace is copied. The memory trace is named Mem<n>[<Data_Trace>] where <n> counts all data and memory traces in the active setup in chronological order, and <Data_Trace> is the name of the associated (copied) data trace.
The exact function of the command depends on the number of memory traces associated to the active data trace:
If no memory trace is associated to the active trace, a new memory trace is generated.
If several memory traces are associated to the active trace, the current measurement data overwrites the last generated or changed memory trace.
To copy a trace to the memory without overwriting an existing memory trace or define a memory trace name, use TRACe:COPY <memory_trc>,<data_trc>. To copy an active mathematical trace use TRACe:COPY:MATH <memory_trc>,<data_trc>
<Chn> |
Channel number used to identify the active trace. |
*RST value |
–
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SCPI, Command Types |
Device-specific, no query
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Example: |
*RST; :CALC:MATH:MEM Copy the current state of the default trace Trc1 to a memory trace named 'Mem2[Trc1]'. The memory trace is not displayed. DISP:WIND:TRAC2:FEED 'Mem2[Trc1]' Display the created memory trace in the active diagram area (diagram area no. 1).
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Activates or deactivates the mathematical mode where the mathematical trace defined via CALCulate<Chn>:MATH[:EXPRession]:SDEFine is calculated and displayed instead of the active data trace. The command is not valid for mathematical traces calculated via CALCulate<Chn>:MATH:FUNCtion.
<Chn> |
Channel number used to identify the active trace.
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<Boolean> |
ON - Display the active data trace |
*RST value |
OFF
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SCPI, Command Types |
Confirmed, command or query.
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Example: |
*RST; :CALC:MATH:MEM Copy the current state of the default trace Trc1 to a memory trace named 'Mem2[Trc1]'. The memory trace is not displayed. CALC:MATH:SDEF 'Trc1 / Mem2[Trc1]' Define a mathematical trace, dividing the data trace by the stored memory trace. The mathematical trace is not displayed CALC:MATH:STAT ON Display the mathematical trace instead of the active data trace.
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Controls the conversion and formatting of the mathematic expression defined via CALCulate<Chn>:MATH[:EXPRession]:SDEFine (see Result is Wave Quantity in the User Def Math dialog).
<Chn> |
Channel number used to identify the active trace.
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<Boolean> |
ON - Result is Wave
Quantity enabled; the analyzer assumes that the result of the mathematical
expression represents a voltage. |
*RST value |
OFF
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SCPI, Command Types |
Device-specific, command or query.
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Example: |
*RST; SWE:TYPE POW Reset the instrument, activate a power sweep, and select a wave quantity a1 for the trace Trc1. CALC:PAR:SDEF 'Trc1', 'a1' Select a wave quantity a1 for the trace Trc1. DISP:WIND:TRAC:FEED 'Trc1' Display the generated trace in the active window. CALC:MATH:SDEF 'StimVal'; STAT ON Define a mathematical trace, dividing the data trace by the stored memory trace. Display the mathematical trace instead of the active data trace. CALC:MATH:WUN ON Take into account that the stimulus value is a voltage (derived from the source power) rather than a dimensionless quantity. The y-axis range of the mathematical trace now exactly corresponds to the power sweep range.
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