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4- 18 Agilent B2900 SCPI Command Reference, Edition 2

Subsystem Commands

:CALCulate:MATH[:EXPRession][:DEFine]

Table 4-2 Arithmetic and Unary Operators

Predefined math expressions

The following math expressions are already defined in the instrument. The

predefined math expressions are not cleared by the power off/on operations.

•Power (POWER)

• Offset Compensated Ohms (OFFCOMPOHM)

• Varistor Alpha (VARALPHA)

• Voltage Coefficient (VOLTCOEF)

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 data measured with the current output

level, and VOLT[c][1] and CURR[c][1] are data measured with a different current

output level or zero output.

This function is effective for reducing measurement errors in low resistance

measurements.

VARALPHA Calculates varistor alpha using the following formula.

VARALPHA = log(CURR[c][1] / CURR[c][0]) / log(VOLT[c][1] / VOLT[c][0])

where, CURR[c][0] and VOLT[c][0] are measurement data at a point on a varistor’s

non-linear I-V characteristics curve, and CURR[c][1] and VOLT[c][1] are data at

another point.

Priority of task Operator Description

High

Low

( ) Parentheses

+ and - Unary plus operator and unary minus operator

^ Exponentiation operator

* and / Multiplication operator and division operator

+ and - Additive operator and subtraction operator

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Agilent Technologies B2902 Manuale di Servizio Pagina 140