Senseca XPT800 handleiding
Handleiding
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XPT800 – Sound Level Meter and Spectrum Analyzer
V1.0
Page 111 of 124
20 Appendix C – Trigger
The trigger function can be managed through parameters which can be set either in EDIT APP > TRIG-
GER or in the SETTINGS > TRIGGER menu. With this function, it is possible to automatically isolate a
sound event during measurement, by identifying a change in sound level or by synchronising with an
external signal or manually by pressing a button. The acoustic descriptors used by the trigger function
are those selectable in the SLM view (see “9.3 Select acoustic parameters to be displayed” on page 54).
The level change that triggers the event identification can be either positive or negative, and the trigger
threshold can be set to a different level from the deactivation threshold. The following image shows an
example of sound event capture with positive polarity. The sound level (LAeq) exceeds the set activa-
tion threshold at the time indicated by cursor V2 and then the stop threshold at the time indicated by
cursor V3.
Fig. 15 - Event identification by trigger function
To prevent even short pulses from being identified as sound events, a minimum activation duration
(duration filter) of up to a maximum of 10s can be set. If the activation threshold is exceeded for less
than the set time, the event is not taken into account. A stop delay can also be set: when the deacti-
vation threshold is reached, the event is delayed for the set time up to a maximum of 3600s. In the
example above, as the trigger conditions persist beyond the set minimum duration, i.e. at least until
time T1, the action provided by the trigger function begins; this includes the seconds before the trig-
ger threshold is exceeded (pre-trigger). The pre-trigger interval can be set via the parameter
Trg_pretrigger. The trigger action is terminated at time T2, with a delay equal to the stop delay start-
ing from the instant identified by cursor V3 corresponding to the crossing of the stop threshold. The
trigger to identify an event, can also be activated by means of an electrical signal connected to the
Trigger I/O input (20.5 Trigger I/O Input) or by pressing a button from the interface (see 10.5 Cus-
tomizing markers). In both cases the minimum duration parameter has no effect, and the event starts
as soon as the trigger is detected.
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Productinformatie
| Merk | Senseca |
| Model | XPT800 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 27123 MB |
