B&K 2250 Light Instrukcja Użytkownika Pobierz pdf (Strona 119)

CHAPTER 12

Signal Recording (Optional Module)

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• All Events, if you want to start and stop the recording based on any of the events

Note: When Recording Control set to any of the events, you can limit the duration of

the recording, if Duration Limit is set to On. In this case the recording will be at least

Minimum Duration long, but no longer than the Maximum Duration. Use

Pre-recording Time and Post-recording Time to specify how much extra you want to

be recorded before and after the event

• Off, if you do not want to record the signal

6) Set Recording Quality to High, Medium, Fair or Low in accordance with your needs,

note, however, that the high quality requires more disk space than low quality – details

in Appendix A.

7) Set Recorded Signal to either Input A/B-weighted, Input C-weighted or Input Z-weighted

(A/B-weighting is determined by setting the parameter in Setup > Frequency

Settings > Broadband (excl. Peak)). Input C-weighted is suitable for recordings used

afterwards to identify the sound source – it contains all the audible content of the signal,

but reduces the low-frequency noise from wind, etc.

8) Set Automatic Gain Control to On if you just want to listen to the signal afterwards. The

full 120 dB dynamic range (from max.input level and down) will be converted to 40 dB

and the signal is stored as a 16-bit wav-file.

Set Automatic Gain Control to Off if you need to record calibrated signals or need to

analyze the wav-file afterwards on a PC. Select Resolution = 24 bit (recommended) to

cover the full 120 dB dynamic range (from max. input level and down) or select

Resolution = 16 bit and specify the Peak Recording Level.

9) Under Input you specify Trigger Input if you want to start the recording using an

external trigger signal. See details in Appendix A.

To exit the screen, tap .

12.2.2 Controlling the Recording

The measurement is controlled in the same way you would control a normal Sound Level

Meter measurement, using Start/Pause , Continue , Back-erase and Reset

pushbuttons, see 3 for more details.

When the measurement signal is being recorded, then the Recording icon is displayed in

the Status Field. The recording is attached to the profile as a Marker 6 (Sound).

If you set Recording Control to Automatic, the recording will start when the measurement is

started and last for Maximum Duration or Elapsed Time, whichever is smallest. If you continue

a paused measurement, then a new recording is started.

If you set Recording Control to Manual Event, the recording will start the first time you press

the Manual Event pushbutton during the measurement (this starts a Manual Event marker and

a Sound marker), and stop the second time you press it; if you press it a second time before

Minimum Duration has elapsed, then the recording will continue until Minimum Duration has

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B&K 2250 Light Instrukcja Użytkownika Strona 119