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Chapter 13

Signal Recording Option

Signal Recording Option BZ-7226 allows you to record the input signal (typically sound) in

either 16-bit or 24-bit resolution during measurement (24-bit for BZ-7222/23/24/25/30/33

only). The signal recording can be controlled manually or by using an external trigger signal.

The recording can also be triggered when a measured parameter exceeds a preset level

(BZ-7224 and BZ-7225 only). The recorded sound can be played back and listened to using the

supplied Earphones HT-0015. Sound is recorded directly to a memory card. With hardware

version 4, sound can also be recorded to a USB memory stick.

The main benefit is that data is documented on-site and is therefore ready for post-processing

and reporting back at the office using Measurement Partner Suite BZ-5503 or other post-

processing software such as Evaluator Type 7820, Protector Type 7825 or Microsoft

Excel

Check the About screen to see whether you have a license to run the Signal Recording option.

(To access the About screen, tap the Help icon then tap About.) See Chapter 9 for

instructions on installing the license for the Signal Recording option.

13.1 Sound Level Meter and Frequency Analysis Software

You can use the Signal Recording facility together with the Sound Level Meter Software and

the Frequency Analysis Software. You can record the sound for the whole measurement period

or you can record sound for controlled parts of the measurement. The recordings are attached

to the project as annotations, named “Soundrec N”, where N is the number of the recording for

the project. (section 3.5 and section 6.3.2 for a description of how to use annotations.)

Note 1: Signal recordings can only be done during measurements.

Note 2: Signal recordings can only be done on projects saved on memory cards (or with

hardware version 4, from a USB memory stick).

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B&K 2250 Light Manual do Utilizador Página 149