Specifications

304 Chapter 16
Command Reference
:SYST:ERR?
:SYST:ERR?
Syntax :SYSTem:ERRor?
Description Returns the oldest error from the 4287A's error queue. The size of the error queue is 100.
You can use the *CLS command to clear all errors contained in the error queue. (Query
only)
NOTE This commands cannot return an error that occurs by manual operation using the front
panel, the mouse or keyboard.
Query response {numeric},{string}<newline><^END>
{numeric}: Error number
{string}: Error message (a double-quoted string)
If the error queue contains no error, the command returns zero for the error number and
“No error” for the error message.
See also *CLS on page 204
Equivalent key
sequence
No equivalent keys are available on the front panel.
:SYST:ERR:COUN?
Syntax :SYSTem:ERRor:COUNt?
Description Returns the number of errors contained in the error queue. (Query only)
Query response {numeric}<newline><^END>
Equivalent key
sequence
No equivalent keys are available on the front panel.
:SYST:EXTR?
Syntax :SYSTem:EXTRef?
Description Returns whether the external reference signal is inputted through the Ext Ref In connector
on the rear panel. (Query only)
Query response {1|0}<newline><^END>
Equivalent key
sequence
No equivalent keys are available on the front panel.
Description
1 External reference signal is inputted
0 External reference signal is not inputted