Keysight Technologies B2900 Series, User Manual

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Keysight B2900 User’s Guide, Edition 5 6-17
Function Details
Math Expression
Math Expression
B2900 provides a math function for performing calculations using the measurement
result data. The calculation result can be displayed and used for the limit test and
trace statistics.
For the predefined math expressions, see “Predefined Math Expressions” .
To define a math expression, see the Keysight B2900 SCPI Command Reference .
Math expressions can be defined by using the :CALC:MATH commands. For
resources effective for the expression, see
“Resources Used in the Expressions” .
To use the math function, see “Math Expression dialog box” on page 4-32 .
To display the calculation result, see “Graph View” on page 4-19 and “Measure
Result dialog box” on page 4-40 .
Predefined Math Expressions
The following math expressions have already been defined in B2900. The
predefined math expressions are not cleared by the power off and on operations.
• Power (POWER)
• Offset Compensated Ohms (OFFCOMPOHM)
• Varistor Alpha (VARALPHA)
• Voltage Coefficient (VOLTCOEF)
In the following formula, [ c ] specifies the channel (1 or 2) used for the
measurement.
POWER
Calculates power using the following formula.
POWER = VOLT[ c ] * CURR[ c ]
OFFCOMPOHM
Calculates offset compensated ohms (resistance) using the following formula.
OFFCOMPOHM = (VOLT[ c ][1]
-
VOLT[ c ][0]) / (CURR[ c ][1]
-
CURR[ c ][0])
where, VOLT[ c ][0] and CURR[ c ][0] are the data measured with a current output
level, and VOLT[ c ][1] and CURR[ c ][1] are the data measured with a different
current output level or zero output.