Trigger Model Operation - Keithley SourceMeter 2400 User Manual

F-6 Contact Check Function

Trigger model operation

In relation to the standard trigger models
test is performed just before the SOURCE Action block in the trigger layer.
NOTE
For the Model 2430 Pulse Mode, the trigger models are shown in
and Figure
As with other trigger model operations, there is an event detector for contact check. With
contact check event detection enabled, operation will hold up at the detector until contact
check is performed, and/or a specified timeout period expires. If contact check passes,
event detection is satisfied allowing operation to move on to perform the SOURCE Action.
If contact check fails (open lead condition), the SourceMeter will wait for the set timeout
period to expire before issuing an open lead failure and moving on to perform the
SOURCE Action. The contact check timeout can be set from 0.00000 to 999.99990 sec-
onds. Note, however, that setting the timeout to 0 seconds disables the timeout. That is,
operation will be held up indefinitely until contact check detection occurs.
With contact check event detection disabled, operation will not hold up at the contact
check event detector and wait for contact check to be performed. In other words, event
detection is satisfied immediately. If contact check is disabled, or the SourceMeter is in
2-wire sense mode, event detection is disabled.
Sweep and binning considerations
Sweep limitations
Staircase and custom sweeps
Auto ohms cannot be used with staircase and custom sweeps. To use these types of sweeps
with contact check, you must use the manual ohms mode. See
ments," page 4-5, for details.
Source memory sweeps
Although the contact function is not stored in source memory,
page 10-7), it is possible to mix both 2- and 4-wire sense modes into the same source
memory list. For the 2-wire sense points, contact check will not be performed, but it will
be performed for those locations using 4-wire sense if contact check is enabled when the
sweep begins.
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2400 Series SourceMeter
(Figure 11-1 and
11-11.
®
User's Manual
Figure 11-8), the contact check
Figure 11-10
"Manual ohms measure-
("Source memory sweep,"