Model 6487 Reference Manual
Limit Tests and Digital I/O
8-11
dlers. Lines 1, 2, and 3 establish the bit pattern and then 10µsec later the SOT strobe
“tells” the handler to read the bit pattern and perform the binning operation. This 10µsec
offset is used to make sure the correct bit pattern is read by the handler.
After the pass/fail is read by the handler, the digital output returns to the clear pattern.
Digital I/O port
The Model 6487's Digital I/O port is a male DB-9 connector located on the rear panel. The
port location and pin designations are shown in
. The four active-low, digital
output lines and one input line are used to control external circuitry.
Figure 8-8
Digital I/O port
Typical applications for the digital I/O port include the following:
•
Component handler control
— When performing limit tests, a component han-
dler can be used to sort DUT into bins. (See
for details.) The
digital I/O of the Model 6487 serves as the interface between the limit tests and the
component handler. Via the digital input line (pin 6), the component handler can
tell the Model 6487 when it is ready for the test. Via the digital output lines, The
Model 6487 sends digital output patterns to the component handler and tells it
when the test is finished. A digital output pattern determines which bin the DUT
belongs in.
120
LINE RATING
50, 60Hz
50 VA MAX
INPUT
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
IEEE-488
CAT
I
TRIGGER LINK
RS-232
MADE IN
U.S.A.
ANALOG OUT
DIGITAL I/O
505V
MAX
V-SOURCE OUTPUT
505V PK TO CHASSIS
LO
HI INTERLOCK
!
!
FUSE
LINE
400mAT
(SB)
100 VAC
120 VAC
200mAT
(SB)
220 VAC
240 VAC
505V PK
505V PK
505V PK
Model 64
8
7 Picoamme
t
e
r
9
8
7
6
5
4
3
2
1
DI
G
ITAL I/O
1 = Di
g
i
t
al Ou
t
pu
t
#1
2 = Di
g
i
t
al Ou
t
pu
t
#2
3 = Di
g
i
t
al Ou
t
pu
t
#3
4 = Di
g
i
t
al Ou
t
pu
t
#4 (EOT
*
)
5 = VEXT
6 =
S
OT
*
7 =
N
o
t
U
s
e
d
8 =
N
o
t
U
s
e
d
9
= Di
g
i
t
al
Gr
oun
d
*St
a
rt
o
f
Te
st
(
S
OT) an
d
En
d
o
f
Te
st
(EOT) a
r
e u
s
e
d
f
o
r
Limi
t
Te
sts
.
