Model 8904A General Information
Digital Modulation.
Appropriately setting the 16 direct control registers allows the instrument to be
used as a digital modulator. Examples of signals which can be generated with this technique include
FSK
or
multilevel FM (up
to
16 levels), BPSK, QPSK, and QAM.
Option
005:
Up to eight instruments may be connected together to form a “master/slave” relationship between the
instruments. One instrument provides the timing signals for the other seven. (If all eight instruments
are equipped with Options 002 and
005,
a
total
of 16 outputs can be synchronized. If eight instrument
have Options 001 and 005,32 internal channels can be synchronized.) Detailed operating information
for
this
function
is
provided in the
HP
8904A Option
005
supplement in section 3A.
Option
006:
A
full-floating, balanced, transformer-coupled output is provided for Output
1.
Output impedance is
6000 instead of the usual 50R. Maximum output level is increased to 20
V
rms
into an open circuit,
or 10
V
rms
into a 600R load. Detailed operating information for this function is provided in the
HP
89044 Option
006
supplement in section 3B.
1-8.
HEWLETT-PACKARD INTERFACE BUS
Compatibility
The Multifunction Synthesizer has an HP-IB interface and can be used with any HP-IB computing
controller or computer for automatic system applications. The Multifunction Synthesizer is fully
programmable via the
HP
Interface Bus. The Multifunction Synthesizer’s complete compatibility with
HP-IB is defined by the following list of interface functions: SH1, AH1, T6, TEO,
L4,
LEO, SR1, RL1,
PP1, DC1, DTO, and CO. The Multifunction Synthesizer interfaces with the bus via open collector
TTL circuitry. An explanation of the compatibility codes can be found in the IEEE Standard
488
and
the identical ANSI Standard MC1.l.
For more detailed information relating to programmable control of the Multifunction Synthesizer,
refer
to
Remote Operation, Hewlett-Packard Interface Bus in section 3 of this manual.
A
booklet
has been prepared entitled “Tutorial Description of the Hewlett-Packard Interface Bus” to provide
a complete overview of the theory and operation of HP-IB. To receive this booklet, order HP part
number 5952-0156.
Selecting the
HP-IB
Address
The Multifunction Synthesizer’s HP-IB address is set by direct front-panel entry and is stored in non-
volatile memory. The instrument
is
delivered with address 26 already set, but may be easily changed
to any address desired from
00
to
30
(decimal). For information on changing the HP-IB address, refer
to paragraph 2-3
PREPARATION
FOR
USE, HP-IB
Address Selection.
1-9.
ACCESSORIES SUPPLIED
The power cable and fuse supplied for the Multifunction Synthesizer are selected at the factory
according to the Mains voltage available in the country of destination. For the part number and rating
of the fuse
,
refer to table 2-1. For the part numbers of the Power Cables and Mains Plugs available,
refer to table 2-2.
Two
BNC-to-Banana Plug adapters (HP
Part
1250-2164) are shipped with each
standard instrument; four adapters are shipped with
an
Option 002 instrument.
rev.01
NOV89
1-9
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