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7-8 Relative and Math

Remote math operations

Math commands

Table 7-3 summarizes commands to control the math functions. See Section 17 for more

detailed information on these and other math commands.

Math programming example

Table 7-4 summarizes the basic command sequence for voltage coefﬁcient testing, which is

a change in resistance of resistive elements with applied voltage. Although such changes in

resistance with voltage are present in virtually all resistors to at least some degree, voltage

coefﬁcients are most noticeable in high-value resistors (>10

Ω).

See Figure 7-2 for DUT

connections.

This example sets up the SourceMeter as follows:

• Source function: volts

• Sense functions: all

• Source delay: 1sec

• Start voltage: 10V

• Stop voltage: 50V

• Math expression: voltage coefﬁcient

Table 7-3

Math commands

Command Description

:CALCulate:MATH:NAME <name>

:CALCulate:STATe <state>

:CALCulate:DATA?

Select match expression (name = “POWER”, “OFF-

COMPOHM”, “VOLTCOEF”, “VARALPHA”).

Enable/disable math (state = ON or OFF).

Query math data.

Keithley 6430 User Manual

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