Model 8904A Operation
Functional Block Descriptions
CPU:
The Central Processing Unit consists of the microprocessor, Numeric Synthesis IC, and
the associated ROM and RAM memories needed
to
store the instruments operating system and
configuration settings. Interfacing between the HP-JB, Digital Port, and keyboard inputs
is
performed
here.
Recall/Save Registers:
This
is
a special section of RAM that
is
used
to
store instrument settings
for
later
retrieval. A battery backup
is
provided
so
that the information in this memory
is
not lost
if
power
is
disconnected from the instrument.
Hop
RAM
Registers:
This
is
the area of RAM where the
16
Hop RAM settings are stored for
Option
003
equipped instruments.
Digital Port:
The Digital Port connector on the rear panel
of
the HP 8904A
is
used primarily for
address selection and timing of the Hop RAM settings.
Fast
hopping
is
achieved by using an external
timing signal. The usage of this connector
is
discussed
later
in Section
3,
along with more details on
using Option
003.
Keyboard:
All
of the front panel controls.
HP-IB:
This
is
the connector for the IEEE-488 compatible Hewlett-Packard Interface
Bus.
Except
for the Line switch,
all
functions
that
can be selected using the front panel controls can be selected
remotely over this control bus. Refer
to
the
Remote
Control
information described later
in
Section
3
for more information regarding the use
of
this connection. Example programs for using the HP-IB are
also provided.
Standard Single Channel:
This block contains the one standard channel included with every
instrument (channel
A).
You can control the Frequency, Phase, Amplitude, and Waveform of the signal.
Option
001
:
Three more channels are added. You may
sum
channels together in various combinations.
(Refer
to
the
Option
001
Specifications
listed in Section
1
for more information on summation.)
Modulation of channel
A
is
provided using one or more of the other channels
as
a
modulating source.
Sequencing of Tone, DTMF (Dual Tone Multi Frequency), and Digital
signals
is
provided.
Option
002:
A
second channel (channel
B)
and a second instrument output port are added. The
two
channels operate independent of each other; however, the phase relationship between the
two
signals
can be varied by adjusting either channel.
Option
003:
This feature provides the ability
to
hop between
16
different channel
A
setups. Frequency,
Amplitude, and Phase can
all
be hopped simultaneously
or
independently. The timing signal and address
selection for accomplishing the hopping
is
input
via
the Digital Port. (See
Digital Port
discussed earlier
in this section.)
3-3
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
