Keithley 237

SECTION3
IEEE-488
Reference
+
a.s.11
S
-Integration
Time
Purpose
Format
Parameters
Default
Description
Programming
Notes
Programming
Examples
3-58
To
control
the
integration
time
and
resolution.
Sn
Integration
Time
Period
Resolution
so
416J..lsec
Fast
4-digit
51
4msec
Medium
5-digit
52
16.67msec
Line
Cycle
(60Hz)
5-digit
S3
20msec
Line
Cycle
(50Hz)
5-digit
Upon
power-up,
or
after
receiving a
OCL
or
SOC
command,
the
instrument
defaults
to
the
last
programmed
selection.
A
JOX
command
sets
the
instrument
to
SO
(416J..lSec
integration
time, 4-digit resolution).
The
S
command
controls
the
A/D
hardware
integration
time
during
each
measure
phase
and
the
display
resolution
of
the
source-measure
unit.
The
integration
times
offer a
tradeoff
among
speed,
resolution,
and
noise rejection.
1.
For
reducing
the
effect
of
line
cycle
noise
at
low
current
levels, select
the
appro-
priate
line
cycle
integration
time.
Changing
the
ac
line
frequency
with
a
front
panel
menu
selection
will
change
the
integration
time,
if
necessary.
For
example,
a line frequency
change
from
60Hz
to
50Hz
also
changes
the
integration
time
from
16.67msec (52)
to
20msec
(53).
2.
The
time
interval
between
readings
in
a
sweep
is
determined
by
the
default
de-
lay,
the
de
or
sweep
delay,
and
the
integration
time.
3.
If
a
pulsed
sweep
is
in
the
buffer,
changing
the
integration
time
causes
the
instru-
ment
to
recalculate
the
delay
times
to
maintain
the
specified
toN
and
toFF.
4.
The
conversions filtered
are
per
the
selected
integration
time.
5.
The
warning
condition
for
the
S
command
is
described
in
the
U9
warning
status
word
(see
paragraph
3.6.19).
10
20
OUTPUT
716;"S1X"
OUTPUT
716;"S2PSX"
+
! Select
4msec
reading
time.
! Select
line
cycle
integration
and
32
reading
filter