Operation Model
8901B
Measurement Codes
All front-panel keys except the LOCAL key have corresponding instrument-
dependent program codes. These codes consist of either two alphabetic characters,
or
an
alphabetic
character and a number; e.g., M3. The underlined letters on the front-panel key labels are both
letters or the initial letter of the programming code
for
that function.
For
example, the code
for
-
AUTOMATIC OPERATION is AU, and the codes
for
TRACK MODE are K1 and KO. The entire
list
of programming codes required
to
make measurements withthe
HP
8901B (not including special
functions) are contained in Tables
3-11
and 3-12.
Turning
Off
Functions
When operating in local operation, many
of
the functions toggle on and
off
with successive keystrokes. In remote operation,
a
specific code turns
off
the functions. The HP-IB
Codes for turning
off
these functions are given in Table 3-1, “Turning
Off
hnctions”.
lbble
3-1.
lhming
Off
finctions
Functions
Off
Audio Input Off (Mod. Output On)
Calibrate
Off
Disable Error Function
Off
Range Hold
Off
(Auto Range On)
All HP Filters
Off
Track Mode
Off
(Lock Mode On)
All LP Filters
Off
dB Ext. Attenuator
Off
Pre-display and De-emphasis
Off
Ratio
Off
-
Code
A0
co
BO
GO
HO
KO
LO
NO
PO
RO
Invalid
Characters
The following Table 3-2, “Response to Unused ASCII Characters” lists the Modulation Analyzer’s
response
to
various ASCII characters not used in
its
code set. The characters in the left-hand column
are ignored unless they appear between
two
characters of a program code (e.g. M
3,
space between the
characters of
a
function code); in which case, they generate Error 24. The characters in the right-hand
columns,
if
received by the Modulation Analyzer,
will
always cause
Error
24 (invalid HP-IB code) and
a Service Request message
to
be generated.
3-14
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