Limit Testing 11-11
SOT line
The input line (SOT) of the Digital I/O is used to control the start of the testing process.
When ↓STEST is the selected arm event of the trigger model, the testing process will start
when the SOT line is pulsed low. When ↑STEST is the selected arm event, the testing process
will start when the SOT line is pulsed high. When ↑↓STEST is the selected arm event, the test-
ing process will start when the SOT line is pulsed either high or low. With the IMMEDIATE
arm event selected, the testing process will start as soon as the LIMITS key is pressed (assum-
ing the output is ON). See Section 10 for details on trigger model configuration.
When using the SOT line, the handler will not pulse the line while it is in a not ready condi-
tion. When the handler is ready (DUT properly positioned in the handler), it pulses the SOT
line low or high to start the test.
/INT line
The /INT line of the Digital I/O can be used if the component handler is equipped with an
interlock switch. With proper use of the interlock, power is removed from the DUT when the
lid of the handler is opened. See Section 12, Digital I/O port and Safety interlock for operation
details on the interlock.
Handler types
The SourceMeter can be used with either of the two basic types of handlers. When used with
a Category Pulse Handler, the SourceMeter pulses one of the four handler lines. The handler
then places the DUT into the bin assigned to the pulsed line.
When used with a Category Register Handler, the SourceMeter outputs a bit pattern to three
handler lines. After the SourceMeter sends the end-of-test (EOT) strobe pulse to the fourth han-
dler line, the handler places the DUT into the bin assigned to that bit pattern.
Category pulse component handler
When using this type of handler, the SourceMeter pulses one of the four handler lines when
a pass or fail condition occurs. The handler then places the DUT in the bin assigned to that
pulsed line. When interfacing to this type of handler, a maximum of four component handler
bins are supported.
If the handler requires low-going pulses, then the four digital output lines of the Source-
Meter must be initially set to high. This initial HI, HI, HI, HI clear pattern on the output lines
represents a “no action” condition for the handler since it is waiting for one of the lines to go
low. A line goes low when the defined fail or pass pattern sets it low. For example, if you want
a particular test failure to pulse line #4 of the handler, the defined fail pattern has to be HI, HI,
HI, LO. When the failure occurs, line #4 will be pulled low, and the DUT will be placed in the
bin assigned to that pulsed line.
If the handler requires a high-going pulse, the four digital output lines of the SourceMeter
must initially be set low. The LO, LO, LO, LO clear pattern represents the “no action” condi-
tion for the handler. When one of those lines are pulled high by a defined pass or fail bit pattern
(i.e., LO, LO, LO, HI), the DUT will be placed in the bit assigned to that pulsed line.
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