Operation Model 8901B
RF POWER
to
50
OHM
CALIBRATION INPUT
OUTPUT
RF
OUTPUT
Figure
3-1
1.
External
Lo
Check (Option
030)
Setup
3-13.
BASIC FUNCTIONAL CHECKS OF THE HEWLETT-PACKARD INTERFACE BUS (HP-IB)
Description
The following ten procedures check the Modulation Analyzer’s ability
to
process
or
send all of the
applicable HP-IB messages described in paragraphs
3-12
through 3-31. In addition, the Modulation
Analyzer’s ability
to
recognize
its
HP-IB address
is
checked and
all
of the bus data, handshake and
control lines except D108 (the most significant
data
line which
is
not used by the Modulation Analyzer)
are set to both their true and false states. These procedures do not check whether
or
not all Modulation
Analyzer program codes are being properly interpreted and executed by the instrument; however,
if
the
front panel operates as expected, the program codes, in all likelihood, will be correctly implemented.
The validity of these checks
is
based on the following assumptions:
0
The Modulation Analyzer performs properly when operated via the front-panel keys (that is, in
local mode). This can be verified with the preceding Basic Functional Checks of the Modulation
Analyzer in paragraph
3-11.
0
The bus controller properly executes HP-IB operations.
0
The bus controller’s HP-IB interface properly executes the HP-IB operations.
If the Modulation Analyzer appears to fail any of these HP-IB checks, the validity
of
the above
assumptions should be confirmed before attempting
to
service the instrument.
The select code of the controller’s HP-IB interface is assumed to be
7.
The address of the Modulation
Analyzer is assumed
to
be
14
(its address
as
set at the factory). This select code-address combination
(that is,
714)
is
not necessary for these checks to be valid. However, the program lines presented here
would have to be modified for any other combination.
These checks are intended to be
as
independent
of
each other as possible. Nevertheless, the
first
four
checks should be performed in order before other checks are selected. Any special initialization
or
requirements for a check are described at its beginning.
3-56
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