HP 3468A - Page 62

DATA LOGGER
The
following
data
logger
program
(LOGGER)
illustrates
the
power
and
and
flex-
ibility
of
an
HP-IL
system.
The
program
takes
ten
sets
of
ten
readings
each,
for
a
total
of
100
readings,
and
stores
them
on
a
cassette
tape
for
future
reference.
The
program
can
easily
be
enhanced
by
adding
a
linearization
routine
between
lines
15
and
16.
An
example
of
linearization
is
the
previous
program
where
the
resistance
of
a
thermistor
was
converted
to
a
temperature.
In
this
way,
temperature
measurements
rather
than
resistance
measurements
are
stored
on
the
tape.
The
program
READ
demonstrates
how
easily
data
can
be
read
from
the
cassette
tape
and
listed
on
a
printer.
Again,
this
program
can
be
enhanced
by
adding
a
routine
to
plot
the
data
on
the
printer.
Of
course,
the
data
can
also
be
printed
or
plotted
as
the
measurements
are
being
taken
in
the
LOGGER
program.
Running
the
LOGGER
Program
Make
certain
that
the
interface
loop
connections
have
been
made
between
the
3468A
multimeter,
41C/41CV
calculator,
82161A
Digital
Cassette
Drive,
and
the
82162A
Printer.
Turn
all
of
the
devices
on.
Before
data
can
be
stored
on
the
cassette
tape,
the
tape
must
be
initialized.
This
is
done
by
executing
the
NEWM
command
(NEW
Medium).
Refer
to
the
HP-IL
Owners
Manual.
Line
03
executes
the
MVAC
subprogram.
This
can
be
changed
to
suit
your
needs.
Deleting
the
line
entirely
gives
you
the
freedom
of
setting
the
3468A
manually
as
often
as
needed.
When
the
device
to
be
tested
has
been
connected
to
the
3468A
input
terminals
and
you
are
ready
to
begin,
type:
LOGGER
[ALPHA
How
the
Program
Works
Space
for
storing
the
100
readings
must
be
allocated
on
the
cassette
tape.
This
space
(or
file)
is
created
and
given
the
name
DATA
in
lines
04, 05,
and
O86.
Lines
07
and
08
are
used
to
return
to
the
beginning
of
the
DATA
file
on
the
cassette
for
data
storage.
Register
OO
is
used
as
a
loop
counter
to
take
ten
sets
of
readings.
The
value
1.010
is
STOred
into
Register
00
(lines
09,
10)
and
is
incremented
and
tested
in
line
22.
57