User manual

F-6 Contact Check Function 2400 Series SourceMeter
®
User’s Manual
Trigger model operation
Contact check can be used with the SourceMeter trigger system to delay or com-
pletely prevent progression through the trigger model unless the contact check is
in a pass state. In relation to the standard trigger models (Figure 11-1 and Figure
11-8), the contact check 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 are
shown in
Figure 11-8 and Figure 11-9.
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 condi-
tion), 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 seconds. 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 con-
tact 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.
Source memory sweeps
The contact check function is enabled globally, rather than for individual source
memory locations (see “Source memory sweep,” page 10-6). However, it is still
possible to mix both 2-wire and 4-wire sense modes in the same Source memory
list. When enabled before the start of a sweep, contact check will be automatically
performed for the memory locations using 4-wire (remote) sense, but not for loca-
tions using 2-wire (local) sense.