Keithley 4200A-SCS Reference Manual page 882

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Model 4200A-SCS Parameter Analyzer Reference Manual

This command creates an entry in the measurement scan table. During any of the sweeping

commands, a measurement scan is done for every force point in the sweep. During each scan, a

measurement is made for every entry in the scan table. The measurements are made in the same

order in which the entries were made in the scan table.

The savgX command sets up the new scan table entry to make an averaging measurement. The

measurement results are stored in the array specified by the result parameter. Each time a

measurement scan is made, a new measurement result is stored at the next location in the result

array. If the scan table is not cleared, performing multiple sweeps will continue adding new

measurement results to the end of the array. Care must be taken that the result array is large

enough to hold all measurements made before the scan table is cleared. The scan table is cleared by

an explicit call to the clrscn command, or implicitly when the devint or execut command is

When making each averaged measurement, the number of actual measurements specified by the

count parameter is made on the instrument at the number of seconds apart specified by the delay

parameter, and then the average is calculated. This average is the value that will be stored in the

results array.

double res1[26];

conpin(3, 2, GND, 0);

conpin(SMU1, 4, 0);

savgi(SMU1, res1, 8, 1.0E-3); /* Measure average */

/* current 8 times per */

/* sample; return results to */

/* res1 array. */

sweepv(SMU1, 0.0, -50.0, 25, 2.0E-2); /* Generate */

/* a voltage from 0 V */

/* to -50 V over 25 steps.*/

This example gets the measurement data that is needed to create a graph that shows the capacitance

versus voltage characteristics of a variable-capacitance diode. This diode is operated in reverse-biased

mode. SMU1 outputs a voltage that sweeps from 0 through -50 V. Capacitance is measured 26 times

during the sweep. The results are stored in an array called res1.

(on page 13-9)

(on page 13-13)

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

Section 13: LPT library function reference