Keithley SourceMeter 2400 Series - Table 19 SCPI Commands; Built-In Math Functions; Table 20 Command Sequence for Power Measurement Example

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Quick Results Guide 39

Remote command programming

SCPI commands

SCPI commands for the built-in math functions are listed in Table 19.

NOTE The percent deviation math function is not provided as a built-in math function for

remote operation. However, it can be conﬁgured as a user-deﬁned expression (see

CALCulate[1] commands in Section 18 of the 2400 Series SourceMeter User’s

Manual).

Programming example

The programming example in Table 20 conﬁgures the SourceMeter to operate as a power

meter (power = V x I). Programming examples for other math functions are provided in the

2400 Series SourceMeter User’s Manual (see CALCulate1 subsystem in Section 18).

Table 19

SCPI commands; built-in math functions

Command Description

:CALCulate:MATH:NAME <name> Select math expression; <name> = “POWER”, “OFF-

COMPOHM”, “VOLTCOEF” or “VARALPHA”.

:CALCulate:STATe <b> Enable/disable math; <b> = ON or OFF.

:CALCulate:DATA? Query math data.

Table 20

Command sequence for power measurement example

Command* Comments

*RST Restore GPIB defaults (source 0V, measure I).

:SOUR:VOLT:RANG 0.2 Select the 200mV source range.

:SENS:FUNC “VOLT”, “CURR” Select V and I meaurement functions.

:SENS:CURR:PROT 100e-3 Set current compliance to 100mA.

:SENS:VOLT:RANG:AUTO ON Select auto range for voltage measurements.

:SENS:CURR:RANG:AUTO ON Select auto range for current measurements.

:CALC:MATH:NAME “POWER” Select the power math expression.

:CALC:STAT ON Enable math.

:OUTP ON Turn output on.

:INIT Trigger source-measure action.

:CALC:DATA? Request power reading.

:OUTP OFF Turn output off.

*SourceMeter must be addressed to talk after sending :CALC:DATA? to acquire power reading.

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