Model 8901B Operation
Special Functions
FUNCTIONS
All Special Functions prefixed
1
to 39
DESCRIPTION
General Information
Special functions enable extended use of the instrument beyond the control normally available from
dedicated front-panel keys. The special functions are best used after
a
thorough understanding
of
the
instrument is grasped.
Special functions are accessed via keyboard entry of the appropriate numeric code terminated by the
SPCL key. (Refer
to
”Procedures”.) The codes comprise
a
prefix, decimal, and suffix. Special functions
are disabled in different ways, depending on the function. Refer
to
the following comprehensive table
for actions which clear
or
disable any special function. Special functions are grouped
by
their prefixes
into three categories
as
follows:
Prefix
0
Prefix
0
is
the Direct Control Special Function intended for use in servicing the Modulation Analyzer
(discussed in detail in Section
8).
All
instrument error messages and safeguards are inactive.
If
the
Direct Control Special hction
is
entered inadvertently, press AUTOMATIC OPERATION.
Prefixes
1
to
39
Prefixes
1
to 39 are the User Special Functions that are used during normal instrument operation when
a special configuration, a special measurement, or special information is required. All error messages
and most safeguards remain in effect unless the operator disables them. These special functions are
described in the table in this instruction.
Prefixes 40 to
99
Prefixes
40
to
99 are the Service Special Functions used
to
assist
in troubleshooting an instrument
fault (discussed
in
detail in Section
8).
The functions available include special internal measurements,
software control, and special service
tests
and configurations. Most instrument safeguards are
relinquished.
If
a
Service Special F’unction
is
entered inadvertently, press AUTOMATIC OPERATION.
Repair personnel can gain arbitrary control of the instrument
as
an aid in troubleshooting.
Viewing Special Function States
In addition
to
completing the entry of special function codes, the SPCL key enables viewing of some
special function settings. The operator-requested settings of Special F’unctions prefixed
1
through
10
can be viewed by pressing the SPCL key once (following no numeric entry). This display is called
the Special Display.
If
some of these Special Functions are in automatic modes (generally the 0-suffix
setting), the actual instrument settings of these functions can be displayed by pressing the SPCL key a
second time while the Special Display
is
still active. This display
is
called the Special Special Display.
Both displays can be disabled by pressing any key except the Blue Key, LOCAL, or
S
(shift) key. (While
either display
is
active, pressing the SPCL key selects the other display.)
A
summary of User Special Functions
is
provided at the end of this instruction.
Also
included
in
this
instruction are procedures for initiating special functions and for obtaining the Special Display and
the Special Special Display.
Special F’unctions 3-237
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