CIRCUTOR DHB Series - Manual (Page 24)

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a) n-on b) n-off
c) on d) off
Fig. 12. Alarm types: a) n-on, b) n-off c) on d) off.
5.4.5 Alarm Types
The DHB-2xx meter is equipped with 2 alarm outputs with NOC contact
(make contact) and two alarm outputs with NOC/NCC contact (make
and break contact) (DHB-224). Each of alarms can work in one of the
six modes . The work of alarms in modes is presented in the fig. 12. :
n-on, n-off, on, off. Two remaining modes : h-on and h-off mean respec-
tively, always switched on and always switched off. These modes are
destined for the manual simulation of alarm states.