Keithley 237

SECTION3
IEEE-488
Reference
G15,0,2 T4
=
(32.7msec) x
(Count)-
2.7msec
All items
ASCIT
with
prefix
and
suffix
G4,2,2 T4
=
(11.3msec)
x
(Count) - 1.7msec
Measure values
ASCIT
with
no
prefix
or
suffix
G5,2,2 T4
=
(13.0msec)
x
(Count) + 3.6msec
Source
and
measure values
ASCIT
with
no
prefix
or
suffix
G15,2,2 T4
=
(29.4msec)
x
(Count)+
l.lmsec
All
items
ASCIT
with
no
prefix
or
suffix
G4,3,2
or
G4,4,2 T4
=
(0.77msec)
x
(Count)+ 3.1msec
Measure values
HP
or
IBM
binary
G5,3,2
or
G5,4,2 T4
=
(1.2msec)
x
(Count) + 3.2msec
Source
and
measure values
HP
or
mM
binary
G15,3,2
or
G15,4,2 T4
=
(2.0msec)
x
(Count) + 2.7msec
All items
HP
or
ffiM
binary
3.7.4
Estimating
de
Performance
The times needed for
de
operation are
shown
in
Figure
3-34
and
explained
in
the following paragraphs.
T1
T2 T3
+
Command
Transfer
Time
(Tl)-
DOCs are transferred
at
5 characters
per
millisecond. A typical command to set
bias level, range,
and
delay (Bl,l,OX) has a
T1
time of
1.4msec.
Command
Execution
Time
(T2) - The execution time
for the previous Bias Operation command is 25msec.
Delay
Times (T3)
-This
time is the
sum
of the default
delay, the user-programmable de delay,
and
the range
change time. Default delays
are
listed
in
Table 3-9. Range
change times for autoranging are described
in
paragraph
3.7.2.
Measure
Time
(T4)-
Measure times are dependent
on
the programmed integration time
and
are listed
in
Table3-12.
Data
Preprocess
Time
(T5)-
This is the time needed for
transferring a reading within the instrument
and
the ap-
plication of cal constants to the reading.
It
is a constant
9msec
per
reading.
Upload
Reading
Time
(T6)-
Table 3-17lists the times
needed to
upload
one line of de
data
for various items
and
output
data
formats.
T4
TS
T6
I
Command
I
Command
I
Delays
l
Measure
I
Data
I
Upload
I
Transfer Execution
Preprocess
Reading
+
SRQon
Reading Done
Figure
3-34.
Single
de
Measurement
Times
Table
3-17.
De
Data
Transfer
Times
Format
ASCII
Data
with
ASCII
Data,
no
HPoriBM
Items Prefix
and
Suffix Prefix
or
Suffix
Binary
Data
Measure 18msec 13msec 4msec
Source
and
Measure 27msec 18msec 6.5msec
All
47msec
30msec 7msec
3-92
+