Keithley 237 - Page 119

2.19.3 IEEE-488
Bus
Operation
The Q command
is
used
to create (and append) a sweep
for a selected waveform.
QO,(level),(range),(delay),(count) Fixed level sweep
Q1,(start) ,(stop) ,(step) ,(range),
(delay)
Q2,(start) ,(stop) ,(points) ,(range),
(delay)
Q3,(level),(range),(pulses),(toN),
(toFF)
Q4,(start) ,(stop) ,(step) ,(range),
(toN),(toFF)
Q5,(start),(stop),(points),(range),
(toN),(toFF)
Linear staircase
sweep
Log staircase
sweep
Pulse sweep
Linear staircase
pulse sweep
Log staircase
pulse sweep
The parameter values used for level, start, stop,
and
step
that are sent
with
the appropriate Q command are similar
to the values entered from the front panel (see
Figure
2-38
through Figure
2-43).
The
IEEE
parameters
that deviate from front panel parameters are explained as
follows:
Count-
Number of points
in
a fixed level sweep
(0001
to
1000).
Delay,
toN,
toFF-
Time parameters are expressed in milli-
seconds
(0
- 65000).
Points-
Logarithmic points
per
decade:
0
=
5 points/decade
1 =
10
points/decade
2 =
25
points/
decade
3
=50
points/
decade
Range-
Source range:
1-source
0=
Auto
1=
1nA
2=
10nA
3=
100nA
4=
1JlA
5=
10JlA
V-source
Auto
1.1V
(236,
237);
1.5V
(238)
11
V
(236,
237);
15V
(238)
llOV
1100V(237)
*
+
+
6=
100JlA
7=
1mA
8=
10mA
9=
100mA
10=
1A(238)
*Dlegal
V
-source option
*
*
*
*
*
SECTION2
Operation
Note: The Q commands to
append
a sweep list
(Q6
through Q11) are explained in paragraph
2.20.
The bias level for a sweep
is
established with the B com-
mand
as follows:
B(level) ,(range) ,(delay)
The delay parameter only applies to de operation. During
sweep operation,
this
parameter
is
ignored. To simplify
programming, the delay parameter can
be
left
out
as fol-
lows:
B(level),(range),
Notice that the comma after the range parameter must be
included. The following programming example shows
how
this
command
is
sent.
HP
BASIC
4.0
Programming
Example:
The following program
will
create a sweep list for the lin-
ear
staircase sweep.
10
REMOTE
716
20
OUTPUT
716;
"F0,1X"
30
OUTPUT
716;
"BO,O,X"
40
OUTPUT716;
"Q1,1,10,1,0,500X"
50
END
Source V
Measure
I
(sweep)
Set bias level to
OV
Create lin stair sweep
list
The above program
will
create a sweep list for the linear
staircase sweep waveform. The staircase
will
be
pro-
grammed to start
at
1 V
and
step
in
1 V
increments
up
to
10V.
The programmed dwell
on
each step
is
1/2
second.
Complete information
on
the IEEE-488
bus
and
these
commands can
be
found
in
Section 3 of
this
manual.
2.19.4 Fixed
Level
Sweep
Perform the following steps to create a sweep list for a
fixed level sweep waveform (see Figure
2-31):
2-67