HP 8642A Operation And Calibration Manual

Operation Model 8642A/B
~
Data input (cont'd)
Sequence
Dependency
3-12
Table 3-3. Relationship Between Keystrokes and fE' --m Code Sequences
Function Front-Panel Keystroke Sequence
~ Sequence
To set a 1 MHz
~ O]CfJ
FR 1 MZ
RF output frequency
To set
an RF
~
REF SET (88)0]
CfJ
FRRS 1 MZ
frequency reference
ofl MHz
To select Special
SPCL (
8 c:=J) 0] 0] 0]
SP 111
Function 111
Some functions in the 864 lA/B are c;oupled together because of internal circuit
configuration limitations. This coupling can limit the execution of a setting when one
Function limits the setting of the other.
For example, amplitude and AM depth are coupled functions; An AM depth of 99.0% IS
possible only when the amplitude setting is between -140.0 and + 14.0 dBm. Therefore,
changing this setting:
to this setting:
Amplitude = + 14 dBm,
AM depth = 99%
Amplitude = + 15 dEm
AM depth = 75%
would not be possible if the amplitude entry was attempted before the AM setting. AM
could be changed first to achieve the setting, but setting AM first would not always be
successful. For example, if you were changing back to the first example (to an amplitude
of + 14 clBm and AM depth of 99%), setting the AM first would not set the requested AM
setting. (To eliminate this sequence dependency problem when setting AM or amplitude,
first turn off AM, then set the amplitude, then set the AM depth.)
How
to Avoid Sequence Dependency Problems
The Detailed Operating Instructions in this Operating Manual describe the limitations of
specific coupled functions and will help you a void entering incorrect sequences. Also,
when operating locally, displayed Execution Error messages direct you to your entry error.
However, if operating via lIP-·m, it might be inconvenient to rely either on the manual or
on error messages for every combination of settings. Flowcharts of Sequence Dependency,
on the following page, can assist in the development of driver subprograms to eliminate
the consequences of sequence dependency. If you follow the flowcharts and still cannot
obtain the requrested setting, that setting is probably not possible.

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English