Model 8642A/B
Operation
Special Functions (cont'd)
SPCL 2XX
How to Turn Off Special Functions
Special functions can be turned off using the following procedures:
• Turn off a single special function. For example, Special Function 209 (Attenuator
Range Hold Off) will turn off Special Function 9 (Attenuator Range Hold On).
Each special function that has a numeric code less than 200 can be disabled using
a special function code that is comprised of the number 200 added to the last 2 digits
of the special function (or added to the single digit for single-digit special functions).
For example, Special Function 4 is disabled with Special Function 204, Special
Function
1
12 is disabled with Special Function 2
1
2, etc.
o Select Special Function 0 (Special Functions 4 through 9 Off) to turn off Special
Functions 4 through 9. This is convenient when frequently using just one, single-digit
special function (for example Special Function 9).
• Select Special Function 100 (All Special Function Codes Less Than 200 Off) to
turn off Special Functions 4 through 9, 11
1
through 119, 121 through 12
3,
134, and
13
5.
o Select
1
INSTR PRESET I (HP-IB: IP) or PARTIAL ( fSHIFT") I INSTFTPRESET I )
(HP-IB:
PP).
How to Display the Special Functions Currently On
SPCL ( [ SHIFT
1
FH )
When SPCL is selected, the codes of the currently selected special functions will be
displayed in numeric order. As each special function is selected, it is placed in numeric
order in that list.
HP-IB:
Use Output Display to read these special functions. (Refer to the discussion
about outputting display information which begins on page 3-21 in the HP-IB portion
of this Section III.)
RF Frequency can be varied by 0.1 Hz using Special Functions 240 and 241. The
status of these is read using the [ MSSG I key. Refer to page 3-19
5,
Information
Messages 149 through 141 and 151 through 159.
HP-IB
Codes
The HP-IB code for special function is SP. When selecting a special function via
HP-IB,
use the number of the special function preceded by SP (for example, SP4 or
SP204). Exactly one or three digits must always be used to select special functions.
Leading zeroes must be suppressed for special functions even though they are required
for some other functions (such as SV, RC, and SS).
Related
Operating
Instructions
Keys
SPCL
HELP
HELP OFF
Codes
SP
HP
HO
Refer to Operating Messages (page 3-1 77) if the instrument displays a message you
want clarified.
3-169
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