B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 117)

CHAPTER 12

Signal Recording (Optional Module)

109

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 signal recording using an

external trigger signal. See details in Appendix A.

To exit the screen, tap .

12.1.2 Controlling the Recording

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

Meter measurement, using Start/Pause, Continue, Reset and Save pushbuttons, see Chapter 3

for more details.

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

Status Field. The recording is attached to the project as an annotation. The Annotations icon

is then displayed to indicate that the project has been annotated.

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

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

continue a paused measurement, then a new recording is started.

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

the Manual Event pushbutton during the measurement, and stop the second time you press it;

if you press it a second time before the Minimum Duration has elapsed, then the recording will

continue until Minimum Duration has elapsed; if you press it a second time after Maximum

Duration has elapsed, then the recording has already been stopped when Maximum Duration

elapsed and the pushbutton will initiate a new recording instead.

When Recording Control is set to External Event, and Trigger Input is set to Voltage Level,

then recording is started when the voltage level is ‘high’ and stopped when voltage level is

‘low’ (details in Appendix A). Duration Limit has no effect on this setting.

If Pre-recording Time has been set, then the recording will start this time before you hit the

Manual Event pushbutton. This is possible because the recording is done continuously in an

internal buffer, ready to be saved as a wave file. The Pre-recording Time is limited by this

buffer size and the Recording Quality – details in Appendix A.

Note: Very long signal recordings will be split into wave files containing maximum 10

minutes, that is, a 35-minute signal recording will consist of 4 wave files, three with 10 minutes

of sound and one with 5 minutes of sound.

12.1.3 Playing the Recording

Signal recordings are attached to the measurement project as annotations. The Annotations

icon is displayed in the Status Field to indicate this. Tap to open the list of annotations.

With hardware version 4, you can tap the annotation to play it back – details in Chapter 3 and

Chapter 6.

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B&K 2250 Light Uživatelský manuál Strana 117