Specifications

608 Appendix G
Messages
Error number: 0
Messages showing the status of the E4991A are displayed in the lower left of the E4991A
LCD screen. The messages include error messages that occur during the execution of GPIB
commands and others that indicate the internal status of the equipment.
Error messages are indicated following the character string “[Err]”, and can be read out by
a GPIB command. On the other hand, messages other than these are indicated without the
“[Err]” character string, and cannot be read out using a GPIB command. In this section the
content and method of resolving each message will be explained.
Order of Error Number
Errors with a negative error numbers are basically general errors for GPIB instruments
defined by IEEE488.2. On the other hand, errors with a positive error numbers are ones
defined specifically for the E4991A.
0 (no error)
No error has occurred.
This message will not be shown on the LCD display but rather, when SYST:ERR?
command on page 517 has been sent on GPIB, in case when the equipment find no
occurrence of an error, the message will be returned as an error number 0.
6 Additional standards needed
Before ending all data measurement requiring the calculation of calibration factors, a GPIB
command has been sent to turn the calibration function On. For example, when the
measurement of Open Standard and Short Standard of the calibration kit is in full
completion,
SENS:CORR1:COLL:SAVE command on page 439 was attempted to be
used to set the calibration function On.
Measure all the necessary calibration data.
7 Calibration required
During when the calibration function has not been set to On, a GPIB command, which is
only possible to be executed while the calibration function is On, has been sent. For
example, during when the calibration function is Off,
SENS:CORR2:COLL command
on page 449 has been used to attempt measuring fixture compensation data.
After measuring all necessary data, turn the calibration function On.