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Operation
Model 8902A
As
a convenience, all lower case alpha characters are treated
as
upper case. Commas and spaces
between program codes are ignored by the instrument and therefore may be used to improve
readability in programming.
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 TRACE MODE are
K1
and KO. The entire
list of programming codes required to make measurements with the HP 8902A (not incliiding special
functions) are contained in Tables 3-1 1 and 3-12.
Turning Off Functions When operating in local operation, many of the functions toggle on and
o f f
with successive keystrokes. In remote operation, a specific code turns off the functions. The HP-IB
Codes
f o r
turning
off
these functions are given in Table 3-1, "Turning
O f f
Functions".
Tahk 3-1. Turning Oif Functions
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
H O
KO
LO
N O
P O
RO
Invalid Characters
The following Table 3-2, "Response to Unused ASCII Characters" lists the Measuring Receiver'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 h4easuring Receiver, will always cause Error 24 (invalid HP-IB code)
and a Service Request message to be generated.
3-14
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