B&K 2250 Light Manual de usuario descargar pdf (Pagina 242)

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Hand-held Analyzer Types 2250 and 2270 – User Manual

Excitation Impulsive

Interrupted Noise

Select Impulsive to excite the room with an

impulse. The analyzer triggers on the impulse,

measures the impulse as a sequence of spectra

with 5 ms intervals, and finally backwardly

integrates the measurements to decay curves.

Select Interrupted Noise to excite the room with

noise, interrupt the noise and measure the decays

– all controlled by the analyzer

Number of Decays 1 to 99 Parameter only available if Excitation = Interrupted

Noise.

Specify the number of decays to be measured

automatically and averaged together per position

Trigger Level 0 to 200 dB Parameter only available if Excitation = Impulsive.

Specify the trigger level for the sound level in any

frequency band – the measurement starts as soon

as this level is exceeded. The measurement has a

pre-trigger of 1 s

Trigger Repeat Off

Set to On to start a new measurement

automatically, after saving the previous

measurement (and after fulfilling the trigger

conditions).

Parameter only available if Excitation = Impulsive

and Automatic Save = Yes

Measurement Mode Parallel

Serial

Combined

Parallel measures all bands in the spectrum

simultaneously, Serial measures selected bands,

and Combined first measures Parallel and then

Serial in an automated sequence

Table A.5 (Cont.) Measurement Control parameters – for Reverberation Time Software BZ-7227

Parameter Values Comment

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 331 332

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B&K 2250 Light Manual de usuario Pagina 242