Keithley 4200-SCS Reference Manual page 626

Section 8: Keithley User Library Tool (KULT)
Example
Figure 8-93
forcei example
Get configured instrument attributes
getinstattr
Purpose
Format
8-110
The ranges of currents and voltages available from a voltage or current source vary
with the specific instrument type. For more detailed information, refer to the specific
hardware manual for each instrument.
To force zero current with a higher voltage limit than the 20 V default, include one of the
following calls ahead of the forcei call:
• A measv call, which causes the 4200-SCS to autorange to a higher voltage limit.
• A rangev call to an appropriate fixed voltage, which results in a fixed voltage limit.
To force zero volts with a higher current limit than the 10 mA default, include one of the
following calls ahead of the forcev call:
• A measi call, which causes the 4200-SCS to autorange to a higher current limit.
• A rangei call to an appropriate fixed current, which results in a fixed current limit.
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 Changing source mode may change measure range
recommended command order.
The reverse bias leakage of a diode is measured after applying 40.0 V to the junction.
Pin 1
Pin 2
double ir12;
.
.
conpin(2, GND, 0);
conpin(SMU1, 1, 0);
limiti(SMU1, 2.0E-4);/* Limit 1 to 200
forcev(SMU1, 40.0);/* Apply 40.0 V. */
measi(SMU1, &ir12);/* Measure leakage; */
/* return results to ir12. */
All instruments in the system configuration have specific attributes. GPIB address is an
example of an attribute. The values of these attributes change as the system
configuration is changed. Therefore, by getting the values of key attributes at run time,
user modules can be developed in a configuration-independent manner. Given an
instrument identification code and an attribute name string, this module returns the
specified attribute value string.
int getinstattr(int inst_id, char *attrstr, char *attrvalstr);
The LPTLib instrument identifier (ID).
inst_id
The instrument attribute name string.
attrstr
Return to Section Topics
HI
Current
Meter
LO
Voltage
Source
SMU1
μ
A. */
Model 4200-SCS Reference Manual
for
4200-901-01 Rev. S / May 2017