Model 8903B Instrument Changes
Section
7
INSTRUMENT
CHANGES
7-1.
INTRODUCTION TO THIS SECTION
This section contains instrument modification recommendations and procedures that could improve
the performance and reliability of your instrument. Refer to
Instrument Covered
by
This
Manual,
paragraphs
1
through 4 in Section
1
for important information about serial number coverage.
7-2.
MODIFICATIONS/CHANGES
Description
Instruments with Serial Prefix 2450A have System
I1
cabinet parts and hardware that are English
thread. Instruments with Serial Prefix 2520A and higher have System
I1
cabinet parts and hardware
that are METRIC thread.
In Section 6,
Replaceable Parts,
both English and Metric thread part numbers are listed. The correct
part numbers are referenced to the instrument’s serial number prefix.
7-3.
FIRMWARE CHANGE SUMMARY
The firmware
is
changed whenever anomalies are found in the instrument’s operation which can be
corrected by altering the Controller’s program. Firmware
is
also changed
to
add new features which
may be only changed in the program or which may
also
result from instrument hardware changes.
Since the program resides in the ROMs (the firmware), the ROMs are altered each time the program is
changed. At that time the new ROMs are given new part numbers and the software (the program) date
is
changed. (To display the software date, key
in
Special Function 42.0.) Always update firmware with
the latest edition, which is backward compatible. (See Service Sheet 15 and 16 for ROM identification.)
1.
Software date code:
11.15
1984
(2450A to 2520A)
1.
ROM
part numbers:
ROM 1, 08903-80016
ROM 2, 08903-80017
ROM
3,
08903-80018
ROM
4,
08903-80019
ROM
5,
08903-80020
ROM 6,08903-80021
ROM 7,08903-80022
ROM 8,08903-80023
ROM 9, 08903-80024
rev.15APR89
7-1
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