User and Programming Manual – Rev N    California Instruments 
Appendix C: Error Messages 
 
Generally the result of sending a 
command that uses incorrect syntax. 
This same error may result from the 
inability of the AC source to process 
successive GPIB non-query commands 
sent to it. To avoid this condition, it is 
necessary for the application 
programmer to insert a 20 msec delay 
between commands. 
Generally the result of sending a value 
that is out of range, i.e., a VOLT 200 
command when the unit is in the 135 V 
(Low) range. 
Generally the result of an over current 
(current limit trip) or over temperature 
condition. 
Generally caused by too many errors 
being generated without reading error 
status, causing error buffer to overflow. 
Generally caused by sending a query 
followed by another command without 
accepting the query response first. 
Table 12-1:  Bus Error Messages