HP 3336A - Page 38

=.
@
6
Model 3336A/B/C
to
implement
these
messages
over
the
HP-IB.
Directions
to
interface
the
instrument
with
an
HP-IB
system
are
given
in
Section
II.
Since
remote
operation
parallels
manual
(front
panel)
operation,
the
operator
should
be
thoroughly
familiar
with
the
front
panel
operation
of
the
instrument
before
attempting
to
operate
it
via
the
HP-IB.
3-106.
The
Hewlett-Packard
Interface
Bus.
The
Hewlett-Packard
Interface
Bus
referred
to
as
the
HP-IB
from
now
on,
is
a
multi-wire
parallel
bus
interconnecting
up
to
15
devices
pro-
viding
a
means
of
communication
between
these
devices.
The
ability
to
communicate
bet-
ween
devices,
program
and
coordinate
instrument
operation,
transfer
measurement
data
and
manage
the
system,
create
new
and
powerful
capabilities
such
as:
—unattended operation.
—data manipulation and storage.
—automatic generation of permanent records by using peripherals
such as plotters and printers.
—the capabilities created by the coordinated operation of two or
more devices.
In
fact,
it
is
not
unusual
to
see
all
these
capabilities
used
in
a
single
application
of
the
HP-IB.
NOTE
HP-IB is Hewlett-Packard’s implementation of IEEE Std.
488-1978, ‘‘Standard Digital Interface for Programmable In-
Strumentation”’.
3-107. Special Operating Considerations. If possible, lock all instruments to a single fre-
quency reference. This will greatly simplify the tuning subroutine in the controller’s pro-
gram. Use the most accurate frequency reference availalble. The -hp- 3336 aging rate is
specified at less than + 5 x 10-6 per year. The -hp- 3336 with Option 004 aging rate is
specified at less than + 5 x 10-8 per week.
3-108. HP-IB Operating Principles.
3-109. Talker. Any device that can, when addressed, send over the HP-IB is a TALKER.
The
-hp-
3336
is
a
talker
since
it
can
send
messages
indicating
its
operating
state
and
the
values of all its programmable functions.
3-110. Listener. Any device that can, when addressed, receive over the HP-IB is a
LISTENER. The -hp- 3336 is a listener since it can receive messages that program its func-
tions. Obviously, it is possible for a device to be both a talker and a listener, though not at
the same time.
Operation