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Section 14: SCPI command reference
:ERRor?
This command reads the error queue.
Usage
:SYSTem:ERRor?
Details
As error and status messages occur, they are placed into the error queue. This query command is
used to read those messages. The error queue is a first-in, first-out (FIFO) register that can hold up to
10 messages. Every time you read the queue, the oldest message is read and that message is then
removed from the queue.
If the queue becomes full, the message "350, 'Queue Overflow'" occupies the last memory location in
the register. On power-up, the queue is empty. When the error queue is empty, the message "0, 'No
error'" is placed in the error queue.
The messages in the queue are preceded by a number. Negative (-) numbers are used for SCPI
defined messages, and positive (+) numbers are used for Keithley Instruments defined messages.
Refer to
Status and error messages
The :SYSTem:ERRor? query command performs the same function as the :STATus:QUEue?
query command
Also see
None
:LSYNc:STATe <b>
This command controls line synchronization.
Usage
:SYSTem:LSYNc:STATe <b>
:STATe?
<b>
Details
This command is used to enable or disable line synchronization and query the state of line
synchronization. When enabled, the integration period does not start until the beginning of the next
power line cycle. For example, if a reading is triggered at the positive peak of a power line cycle, the
integration period does not start until that power line cycle is completed. The integration period starts
when the positive-going sine wave crosses zero.
With line synchronization disabled, the integration period starts when the reading is triggered.
Also see
None
14-124
(on page 2-11) for a list of the messages.
(:STATus subsystem
(on page 14-99)).
O or OFF: Disable line synchronization
1 or ON: Enable line synchronization
Model 6517B Electrometer Reference Manual
6517B-901-01 Rev. C / August 2015
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