Intgx - Keithley 4200A-SCS Reference Manual

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Model 4200A-SCS Parameter Analyzer Reference Manual

intgX

This command performs voltage or current measurements averaged over a user-defined period (usually, one AC

line cycle).

int intgi(int instr_id, double *result);

int intgv(int instr_id, double *result);

The averaging is done in hardware by integration of the analog measurement signal over a specified

period of time. The integration is automatically corrected for 50 Hz or 60 Hz power mains.

For a measurement conversion, the signal is sampled for a specific period of time. This sampling time

for measurement is called the integration time. For the intgX command, the default integration time

is set to 1 PLC. For 60 Hz line power, 1 PLC = 16.67 ms (1 PLC/60 Hz). For 50 Hz line power, 1 PLC

= 20 ms (1 PLC/50 Hz).

The default integration time is one AC line cycle (1 PLC). This default time can be overridden with the

KI_INTGPLC option of setmode. The integration time can be set from 0.01 PLC to 10.0 PLC. The

devint command resets the integration time to the one AC line cycle default value.

The only difference between measX and intgX is the integration time. For measX, the integration

time is fixed at 0.01 PLC. For intgX, the default integration time is 1 PLC but can set to any PLC

value between 0.01 and 10.0 by using the setmode command.

rangeX directly affects the operation of intgX. The use of rangeX prevents the instrument

addressed from automatically changing ranges. This can result in an overrange condition that would

occur when measuring 10.0 V on a 4.0 V range. An overrange condition returns the value 1.0E+22 as

the measurement result.

If used, rangeX must be in the test sequence before the associated intgX command.

In general, measurement commands that return multiple results are more efficient than sending

multiple measurement commands.

Compliance limits – A compliance limit setting goes into effect when the SMU is on a measure

range that can accommodate the limit value. For manual ranging, the rangeX command is used to

select the range. For autoranging, intgi or intgv triggers a needed range change before the

measurement is made. See

4200A-901-01 Rev. C / February 2017

The instrument identification code of the measuring instrument, such as SMU1

The variable assigned to the result of the measurement

(on page 3-3) for details.

Compliance limits

Section 13: LPT library function reference