Keithley 4200A-SCS Reference Manual page 906

Model 4200A-SCS Parameter Analyzer Reference Manual
Note that changing the source mode of the SMU can modify the measure range. If the sourcing mode
is changed from voltage to current sourcing (or from current to voltage sourcing), the measure range
may be changed to minimize variations in the SMU output level. See
recommended command order.
If adelay is called before asweepX, each adelay value is added to the asweepX delay_time.
This sum is compared to the maximum delay for the configured instrument card and if any value is
larger, an error will occur. The SMU maximum delay is 2,147.483 s. The CVU maximum is 999 s.
Example
double icmeas[10], ifrc[10];
.
.
ifrc[0]=1.0e-10;
for (i=1; i<10; i++) /* Create decade array from */
/* 1.0E-10 to 1.0E-1. */
ifrc[i]=10.0*ifrc[i-1];
.
.
conpin(SMU1, 1, 0); /* Base connection. */
conpin(SMU2, 2, 0); /* Collector connection. */
conpin(GND, 3, 0);
limiti(SMU2, 200.0E-3); /* Reset I limit to maximum. */
smeasi(SMU2, icmeas); /* Define collector current */
/* array. */
forcev(SMU2, 5.0); /* Force vce bias. */
asweepi(SMU1, 10, 10.0E-3, ifrc); /* SweepIB, 10 points, 10 ms */
/* apart. */
This example gathers data to construct a graph showing the gain of a bipolar device over a wide range of
base currents. A fixed collector-emitter bias is generated by SMU2. A logarithmic base current from 1.0E-
10 to 1.0E-1A is generated by SMU1 using the asweepi command. The collector current applied by
SMU2 is measured 10 times by the smeasi command. The data gathered is then stored in the icmeas
array.
Also see
limitX (on page 13-75)
savgX (on page 13-36)
sintgX (on page 13-44)
smeasX (on page 13-45)
trigXg, trigXI
4200A-901-01 Rev. C / February 2017
(on page 13-47)
Section 13: LPT library function reference
rangeX (on page 13-83) for
13-61