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Exatron 3000B
www.exatron.com 3-11 Chapter 3 Interface Info
F
IGURE
3-2
H
ANDLER
P
ORT
I
NTERFACE
Timing Detail
The handler first moves a device into the test site. After allowing time for the device to settle, (
NOTE
:
this settling time is programmable; use address 0097) the test head plunger picks up the device and
plunges it down toward the contactors. Then the handler issues a start pulse (Pin 10) to the tester.
The start pulse width is programmable, (address 0098) but will be pre-set to 20 milliseconds. This
pulse is normally High (+5) and goes Low for the pulse width. There is an additional signal available on
Pin 22. This testing signal will go Low for the duration of the test. It will go Low at the start of the start
pulse and will not go High again until the handler receives a sort signal.
To complete the test, the tester must send back one of eight sort signals. These signals must be normally
High and go Low for at least two milliseconds. The sorts must appear on Pin 1 through Pin 8 on the
handler port connector. We recommend that you use Pin 1 for PASS and Pin 2 for FAIL when using the
handler in PASS/FAIL applications.
The Input Sort is connected to a PAL device which "latches" the signal. The latch sets the falling edge of
the sort signal ON. Make certain that your interface does not allow fast "glitches" which may become
latched, causing the handler to mis-sort. If desired, the PAL may be modified to one that requires an "End
of Test" edge as well. Further details are provided in the Handler Port Options section later in this
chapter.
INDEX / SORT TIME
TEST TIME
20 MSEC
ADJUSTABLE
SORT MUST BE STABLE FOR 1 MSEC MINIMUM PRIOR TO EOT
PULSE OR LEVEL
HANDLER ALLOWS ONLY
ONE SORT INPUT PER TEST
ALL HANDLER INPUTS AND
OUTPUTS STANDARD
TTL LOGIC
NORMALLY HIGH
ACTIVE LOW