Model 4200A-SCS Parameter Analyzer Reference Manual
Section 13: LPT library function reference
4200A-901-01 Rev. C / February 2017
13-37
Details
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
savg
X
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
called.
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.
Example
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
.
Also see
(on page 13-9)
(on page 13-13)
