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Instrument Changes Model
8904A
Serial Prefix
2737A
and below
2747A
and below
281 7A
and below
291 7A
and below
To
retrofit Option
006
(balance output), order HP
11837A
from your local Hewlett-Packard Sales
office. Only instruments with serial prefix
2948A
and above can be retrofit with this option. The
added balanced output will replace one of the outputs already in the instrument if it has Option
002
(second internal synthesizer and output).
If
the instrument has Option
004
(front-panel connectors
moved to rear panel), the rear-panel connectors will need
to
be moved to the front panel.
Nature of Modification
Modification for possible ground wire shock hazard.
Modification for output overvoltage protection improvement.
Modification for potential power supply short.
Modification for front panel assembly.
7-3.
INSTRUMENT MODIFICATIONS
Instrument modifications include firmware updates and hardware modifications.
For
information on
firmware updates refer to the following table and to the section titled
Firmware Updates.
Serial Prefix
~
2732A
and
below
2737A
to
2942A
2948A
and above
~
Revision Code
~~
20987A
22987A
and
22987A
27887A
Firmware History
~~
The first
two
editions of firmware had several problems and were incomplete,
though useable. It is recommended that all instruments be upgraded to
Revision
22987A
with HP
08904-8701
0
as
A2U12*.
Problems noted in the previous firmware revision were fixed. However, the
following problem has been noted: When used with HP-IB controllers which
process HP-IB commands very fast, the instrument may hang up the HP-IB
when the instrument is a talker. This problem can
be
corrected by upgrading
to Revision
22987A
with HP
08904-8701
0
as
A2U12'.
Problems noted in the previous firmware revisions were fixed. Programs for
operating Options
005
and
006
were added. Two enhancements were added
to Option
001:
Hop
RAM
sequencing and
FM
stereo.
A
physical re-design
of
the controller was made which does not permit this added firmware to be
retrofitted into older instruments.
'Two revisions
of
firmware share the same revision code: 22987A. The older revision has part number HP 08904-87007 for
ROM
A2U12;
the newer revision has part number
HP 08904-87010.
For
information on recommended hardware modifications refer to the following table and to the section
titled
Hardware Modifications.
7-2
rev.
15DEC89