B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 13)

Calibration

CHARGE INJECTION CALIBRATION (CIC)

Injects an internally generated electrical signal in parallel with the

microphone diaphragm. A manual CIC can be performed whenever there

is no measurement in progress

An automatic CIC can be performed at the start and end of a logging

measurement

Storage

Measurement data is stored on an external memory device.

For availability, please refer to the Ordering Information

Notifications

ALARM CONDITIONS

CIC failed (in addition to those specified for BZ-7130)

Weather Data

MM-0256-A WEATHER STATION KIT

Six parameters: Wind Speed, Wind Direction, Ambient Temperature,

Ambient Humidity, Ambient Pressure, Rain Gauge)

MM-0256-A WEATHER STATION KIT

Two parameters: Wind Speed, Wind Direction

Software Specifications – Signal Recording Option BZ-7226

Signal Recording Option BZ-7226 is enabled with a separate license. It

works with all the software for Type 2250-L: Sound Level Meter,

Frequency Analysis and Logging Software

For data storage, Signal Recording requires:

• SD Card

• USB Memory Stick

RECORDED SIGNAL

A-, B-, C- or Z-weighted signal from the measurement transducer

AUTOMATIC GAIN CONTROL

The average level of the signal is kept within a 40 dB range, or the gain

can be fixed

SAMPLING RATE AND PRE-RECORDING

The signal is buffered for the pre-recording of the signal. This allows the

beginning of events to be recorded even if they are only detected later.

PLAYBACK

Playback of signal recordings can be listened to using the

earphone/headphones connected to the headphone socket

RECORDING FORMAT

The recording format is either 24- or 16-bit wave files (extension .WAV)

attached to the data in the project, easily played-back afterwards on a PC

using BZ-5503, Type 7820 or 7825. Calibration information is stored in

the .WAV file, allowing PULSE to analyse the recordings

Functions with BZ-7130 and BZ-7131

Manual Control of Recording: Recording can be manually started and

stopped during a measurement using a pushbutton or an external signal

Automatic Control of Recording: Start of recording when measurement

is started. Minimum and Maximum recording time can be preset

Functions with BZ-7133

Manual Control of Recording (using Manual Event or Back-erase

pushbutton, or an external signal): Recording during all of the event,

or for preset minimum and maximum duration. A Sound marker is set

while recording. Selectable pre- and post-recording time

Manual Control of Recording (using touch screen): Recording for the

selected time period (subject to the limitations of the pre-recording

buffer). A Sound marker is set for the selected time period

Automatic Control of Recording: Recording during all of the event or

for preset minimum and maximum duration. Selectable pre- and post-

recording time

Playback: Playback of signal recordings can be listened to using

earphone/headphones connected to the headphone socket

Gain Adjustment: –60 dB to 60 dB

Software Specifications – Tone Assessment Option BZ-7231

LICENSE

Tone Assessment Option BZ-7231 is enabled with a separate license and

can be used with the 1/3-octave and logging template (BZ-7132 and

BZ-7133)

TONE ASSESSMENT

Tone assessment is based on the measured 1/3-octave spectrum in

accordance with either the international ‘ISO 1996:2007 Acoustics –

Description, assessment and measurement of environmental noise – part

2: Determination of environmental noise levels. Annex D (informative)

Objective method for assessing the audibility of tones in noise –

Simplified method’

SPECTRA ASSESSED

The displayed 1/3-octave spectrum (L

)

may be assessed. Assessment is made as post-processing, that is, when

measurement is paused or stopped

SETUP ACCORDING TO STANDARD

Setups in violation of the standard are indicated as such on the display.

You can then accept to apply the default setup. Tone assessment will be

made if possible, in spite of standard violations. For tone assessment

according to ISO 1996-2, Annex D, you can set the division between the

Low and Middle frequency range, the division between the Middle and

High frequency range, and the limits for the level differences between

adjacent bands

RESULTS

Tones are indicated above the spectrum when Tone is selected as

spectrum parameter. The resulting adjustment can be viewed on the

Value panel. It is not saved with the measurement

QUALITY INDICATORS

On the display, a quality indicator (smiley) will indicate that a hint is

available for tone assessment quality.

Click on the indicator to see the hint

Sampling

Rate

(kHz)

Maximum

Pre-recording (s)

16-bit

Maximum

Pre-recording (s)

24-bit

Memory

(KB/s)

16-bit

Memory

(KB/s)

24-bit

8 470 310 16 24

16 230 150 32 48

24 150 96 48 72

48 70 43 96 144

1 2 ... 8 9 10 11 12 13 14 15 16

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