Keithley 237 - Page 133

Delay-
Programmed
in
milliseconds
(0
to
65000).
First-
First
data
point to
be
modified.
Last-
Last
data
point to
be
modified.
HP
BASIC 4.0 Programming Example:
The following program will modify a fixed level sweep.
10
REMOTE716
20
OUTPUT
716;
11
F0,1X
11
Source V
Measure I
(sweep)
30
OUTPUT
716;
11
BO,O,X"
Set
bias to
OV
40
OUTPUT716; Create fixed level
11
Q0,1,0,500,10X"
sweep
50
OUTPUT716;
Modify point 1
II
A2,0,500,1,1X"
60
OUTPUT716; Modify points 4, 5
and
6
II
A3,0,1000,4,6X"
70
END
Lines
10 through
40
create a fixed level sweep
(1V,
1/2
second delay,
10
measure points). Line
50
modifies point
1 to
2V.
Line
60
modifies points 4, 5
and
6 to
3V
with
a de-
lay of one second.
Complete information
on
the IEEE-488
bus
and
this
com-
mand
can
be
found
in
Section 3 of this manual.
2.22
CONFIGURE TRIGGERS
Source Measure Unit
operation consists of a series
of
source-delay-measure
(SDM)
cycles.
In
de
operation, the
Source Measure
Unit
will
continuously execute
SDM
cy-
cles (see Figure 2-46). In sweep operation, the
number
of
SDM cycles
that
make
up
the sweep waveform is defined
by
the user. Figure 2-47 A shows a five-point fixed level
sweep waveform. For a staircase sweep,
an
SDM
cycle oc-
curs
at
every step of the staircase as
shown
in
Figure
2-47B.
For a pulse sweep,
an
SDM
cycle occurs
at
each pulse
on
level
and
bias off level as shown
in
Figure 2-47C.
+
+
SECTION2
Operation
The available trigger setups are
shown
in
Figure 2-48.
Input
triggers are
used
to
control
when
source, delay,
and
measure operations occur. The
input
(IN) triggers
are described
in
paragraph
2.22.1.
The
input
trigger stimulus
may
be
provided
by
the front
panel MANUAL trigger button,
an
external device that
applies a TTL level pulse to the TRIGGER
IN
connector
on
the rear panel,
or
an
appropriate IEEE-488 operation.
Input
trigger origin is described
in
paragraph 2.22.2.
The Source Measure
Unit
is capable of sending
TTL
level
output
pulses (via its TRIGGER OUT
connector) to
trig-
ger operations of external devices, such as another
Source
Measure
Unit.
The Source Measure
Unit
can
be
programmed to
output
a trigger after
any
phase of the
SDM
cycle.
Output
(OUT) triggers are described
in
para-
graph
2.22.3.
In addition to the previously mentioned
output
triggers,
the Source Measure
Unit
can also
be
programmed to out-
put
a trigger pulse
at
the
end
of a sweep. The sweep
end
output
trigger
setup
is described
in
paragraph
2.22.4.
Finally,
input
and
output
triggers of the Source
Measure
Unit
can
be be
disabled
by
the
enable/
disable triggers
setup
which is described
in
paragraph
2.22.5.
The procedure to configure the triggers is provided
in
paragraph
2.22.6. Programming the trigger over the
IEEE-488
bus
is covered
in
paragraph
2.22.7.
jf-soM+soM+soM+soM4
•• •
Bias
_j
)( )(
)(
)(
• • •
0
X
=
Measure
point
Figure 2-46.
SDM
Cycles
-De
Operation
2-81