Operating instructions

Language Dictionary
79
Returned Parameters
<NR3> VOLT:TLEV? returns the transient voltage level for present range. If the
electronic load is not in CV Mode, the level will still be set, even if it is less than
the presently programmed input level.
VOLT:TLEV? MAX and VOLT:TLEV? MIN return the maximum and
minimum programmable values for the present range.
Related Commands
TRANsient Subsystem
Command and Parameters Summary
Table 4-1 lists all electronic load common commands in alphabetical order, followed by all root-level commands in
alphabetical order. For the numerical parameters of a specific electronic load model, refer to the ’’Programming Ranges’’
table in that model’s Operating Manual. See Chapter 2 in this manual if you are not familiar with the representations used as
data types.
Error Messages
Table 4-2 lists the error numbers and associated error messages that apply to the electronic load. The error number is the
value that is placed in the electronic load’s error queue. This can be read back using the SYST:ERR? query, which returns
the error number into a variable, and both the error number and error message into a string. Information inside the brackets
is not part of the standard error message, but is included for clarification. Command errors (-100 through -199) set bit 5 in
the Standard Event Status register. Execution errors (-200 through -299) set bit 4 in the Standard Event Status register.
Device-dependent errors (-300 through -399) set bit 3 in the Standard Event Status register. Query errors (400 through 499)
set bit 2 in the Standard Event Status register. See Chapter 5 - Status Reporting for a complete description of the Standard
Event Status register.
Hardware Errors During Turn-On Selftest
If a GPIB failure occurs during selftest, the electronic load may or may not be able to communicate with the controller. If it
can, error -330 (Self Test Error) is placed in the error queue. If an electronic load input error occurs during selftest, error
-330 and error -240 (Hardware Error) are placed in the queue. If input errors occur, the electronic load will generate one or
more -240 errors for each command it cannot process. Use the SYST:ERR? query to read the error queue after turn-on to
ensure that no -330 or -240 errors are present. Any electronic load value returned by a query (such as CURR?) should be
assumed to be invalid.
Hardware Errors During Operation
If an error does not occur during selftest but after the electronic load has been operating correctly for a time, error -240 is
placed in the error queue. Most subsequent commands will not be executed and will also cause one or more -240 errors to
be placed in the queue after each attempt. If your application requires the controller to be signaled if the electronic load
fails, program the status registers to allow Execution errors or Device-dependent errors to generate an SRQ to the controller.
See Chapter 5 - Status Reporting for more details.