User Manual

2400 Series SourceMeter
®
User’s Manual Limit Testing 12-15
Enabling auto-clear
To enable auto-clear:
1. Press CONFIG then LIMIT.
2. Select DIGOUT, then press ENTER.
3. Choose AUTO CLEAR, then press ENTER.
4. Select ENABLE, then press ENTER.
5. At the prompts, set the auto-clear pulse width (0s to 60s) and clear bit pat-
tern (0 to 15, 4-bit; 0 to 7, 3-bit size). Use EXIT to return to normal display.
Auto-clear timing
The following timing diagram example (Figure 12-9) and discussion explain the
relationship between the digital output lines for auto-clear.
Figure 12-9
Digital output auto-clear timing example
Initially, the four digital output lines are cleared (in this case, they are all set high).
Limit tests start when the start-of-test (SOT) pulse is received from the component
handler. When the testing process is finished, the pass or fail pattern is applied to
the digital output. As shown in the diagram, lines 2, 3, and 4 go low while line 1
remains high.
SOT*
Line 1
Line 2
Line 3
Line 4
(EOT)
10µs 10µs
Delay
/BUSY
Meas.
* With the SOT line being pulsed low (as shown),
i STEST must be the selected
event for the trigger model. If the SOT line is instead pulsed high by the handler,
h STEST must be the selected arm event. For high or low pulses, select hiSTEST.