Agilent Technologies E5052A Programmer's Manual page 474

Status Reporting System
General Status Register Model
Condition Register and Transition Filter
When the status register has a transition filter, there is a lower register called a condition
register under the event register. The transition filter is between the event register and the
condition register.
The transition filter enables you to select a positive and/or negative transition of the
condition register bit in order to set a bit in the corresponding event register. For example,
using the negative transition filter to set bit 3 to "1" causes bit 3 of the event register to be
set to "1" when bit 3 of the condition register makes a negative transition, that is, when it
changes from 1 to 0.
Figure B-2 Transition filter and condition register
In the E5052A, the following registers provide a condition register and transition filter:
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Operation status register
Operation user defined status register
Questionable status register
Appendix B