HP 8642A Operating Manual page 204

Operation
Model 8642A/B
Operating Messages (cont'd)
Execution Error Messages
Local: These messages are automatically displayed.
HP-IB: All of these messages are output via HP-IB using "OE".
Execution Error messages (message code is prefixed with "E") describe the Signal Generator's reason for not
executing an attempted setting. Some settings are not possible because functions are coupled together due
to limitations of internal circuit configuration. This coupling will sometimes limit the execution of a
setting because one function limits the setting of the other. When your setting attempt cannot occur, the
Signal Generator explains the restriction. Execution Error messages occur immediately after executing a
command that does not execute.
HP-IB: You can read only the first Execution Error message if more than one has occurred. For example,
assume that more than one Execution Error message has occurred since either the Status Byte was cleared
or since the last time "OE" was executed. Then reading an Execution Error message using "OE" will enable
you to read out only the first message.
NEXT STEP NOT POSSIBLE E l 4001
Next step is not possible. The current setting cannot be stepped up or down (as attempted) with the
increment set value. To clear the message without changing instrument settings, select the [ SHIFT ] key
twice. If you want to read a message that might more specifically describe the setting problem, attempt a
data setting similar to the step attempt that caused this error message.
NOT POSSIBLE. ABOVE MAX E 2 4002
Not possible above the maximum setting ever allowed. The attempted setting is above the function's
maximum possible setting (independent of other functions).
NOT POSSIBLE. BELOW MIN E3 4003
Not possible below the minimum setting ever allowed. The attempted setting is below the function's
minimum possible setting (independent of other functions).
SELECT MOD.PREFIX FIRST E4 4004
Select the type of modulation first. A modulation source was selected when a modulation setting was not
displayed. Before selecting the modulation source, select any of the following modulation types: PAM I.
fFMi,
*M
(rsnrm rpwi), or
PULSE
(rsHirn rmn y
HP-IB: Specify the modulation type code (AM, FM, PM, or PL) before the modulation source prefix code
(NT, XA, XD, BA, or BD).
SELECT SWP.PREFIX FIRST E 5 4005
Select the type of sweep first. A sweep mode (auto, manual, or single) was selected without specifying the
sweep type (frequency or amplitude sweep). Select [ START FREQ 1. fSTOP FREQ ). [ START AMFTD j ,
or [ STOP AMPTD ] before selecting the sweep mode.
HP-IB: Specify the sweep type code (FA, FB, AA, or AB) before the sweep mode code (SA, SM, or SG).
PLEASE SELECT FUNCTION E6 4006
Please select an active function. A data value was attempted during manual sweep or when no active
function existed. Select a valid function before attempting to enter a data value.
HP-IB: Precede the data entry with a function prefix code.
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