Commands To Control Digital I/O Port For Limit Testing; Limit Test Programming Example - Keithley SourceMeter 2400 User Manual

12-24 Limit Testing
Table 12-1 (continued)
Limit commands
Command*
:CALCulate2:CLIMitis:FAIL:SMLocation <location>
:CALCulate2:CLIMits:BCONtrol <name>
:CALCulate2:CLIMits:CLEar
:CALCulate2:CLIMits:CLEar:AUTO <state>
:CALCulate2:CLIMits:MODE <name>
* LIMitX = LIMit2, LIMit3, LIMit5 through LIMit12. LIMit4 (Contact check option) not shown (see
Table 12-2

Commands to control Digital I/O port for limit testing

Command
:SOURce2:BSIZe <n>
:SOURce2:TTL <NRf> | <NDN>
:SOURce2:TTL4:MODE <name>
:SOURce2:TTL4:BSTate <state>
:SOURce2:CLEar
:SOURce2:CLEar:AUTO <state>
:SOURce2:CLEar:AUTO:DELay <n>

Limit test programming example

Diode breakdown voltage test is an example that readily lends itself to pass/fail analysis.
This test verifies the reverse and often the forward voltage at which the device begins to
show a large deviation in current for a small deviation in voltage. The test is performed by
sourcing a specified current level and then measuring the resulting voltage drop. The volt-
age drop is then compared with one set of limits to determine if the diode passes or fails
and should be discarded. Voltage measurements for failing diodes are also compared
against a more restricted range of limits to determine if they should be routed to QA
(Quality Assurance) for further analysis.
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2400 Series SourceMeter
Description*
Specify fail source memory location. (Location =
NRf (memory#) or NEXT (next location).
Control I/O port pass/fail update. Name =
IMMediate (at failure) or END (end of sweep).
Clear test results, reset I/O port.
Enable/disable auto-clear (state = ON or OFF).
Select Digital I/O control mode (name =
GRADing or SORTing).
Table 18-1
Description
Set Digital I/O port bit size (n = 3 or 4).
Set I/O port bit pattern (NRf | NDN = pattern).
Set Digital I/O line 4 mode (name = EOTest or BUSY).
Set BUSY and EOT polarity (HI or LO).
Clear digital output lines.
Enable/disable I/O port auto clear (state = ON or OFF).
Set auto-clear delay (n = delay).
®
User's Manual
and Appendix F).