AMETEK HPD Series GPIB-Multichannel - Manual (Page 121)

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Appendix C. Error Messages
Overview
Errors are placed in a queue as they are detected. The queue works on a first in, first
out (FIFO) basis. If the queue overflows, the last error in the queue is replaced with
error –350, “Queue Overflow”. When all errors have been read from the queue,
further error queries return 0, “No error”.
The error queue is cleared when any of the following occur (IEEE 488.2, section
11.4.3.4):
• Upon receipt of a *CLS command
• Upon reading the last item from the queue
All negative values are reserved by the SCPI standard. All errors unique to the power
supply have positive values.