B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 225)

CHAPTER 18

Specifications

213

SAMPLING RATE AND PRE-RECORDING FOR

2-CHANNEL RECORDING

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 FFT

template (BZ-7230) or with 1/3-octave and logging

template (BZ-7223, BZ-7224 and BZ-7225)

FFT Based Tone Assessment

(with BZ-7230 Only)

STANDARD

Tone assessment is based on the measured FFT

spectrum in accordance with ‘ISO 1996:2007

Acoustics – Description, assessment and

measurement of environmental noise – part 2:

Determination of environmental noise levels. Annex C

(informative) Objective method for assessing the

audibility of tones in noise – Reference method’

SPECTRA ASSESSED

Any displayed sound FFT spectrum (FFT, Ref or MAX)

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 may then accept to apply the

default setup

Tone assessment will be made if possible, in spite of

standard violations

Tone Seek Criterion: 0.1 to 4.0 dB in 0.1 dB steps

TONE AT CURSOR

A sinusoidal tone is available at the Headphone

output, to help confirm identified tones

Frequency: the frequency is selected by the Main

cursor

Gain: –70 dB to +10 dB

Options: The generated tone can be mixed with the

input signal

TONE ASSESSMENT CURSOR

All tones found are indicated in the display.

The Tone cursor is initially placed at the most

prominent tone, and can then be stepped through the

tones found.

You can also use the Main cursor to step through the

tones

RESULTS

Results are displayed in the Tone panel and in the

Value panel

They are not saved with the measurement

All Tones: Frequency, Tone level L

pti

, Masking noise

level L

, Audibility L

, Critical Band CB, Tone vs.

Noise Level difference L

, Audibility criterion L

ts,krit

Most Prominent Tone: Tone Level L

, Adjustment K

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

1/3-octave Based Tone Assessment

(with BZ-7223/24/25 Only)

Tone assessment is based on the measured 1/3-

octave spectrum in accordance with either the interna-

tional ‘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’ or

the Italian law ‘DM 16-03-1998: Ministero

dell'ambiente, Decreto 16 marzo 1998’

SPECTRA ASSESSED

The displayed 1/3-octave spectrum (L

, L

max

or L

min

)

may be assessed. Assessment is made as post-

processing, that is, when measurement is paused or

stopped

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

HW 1 – 3 HW G4 HW 1 – 3 HW G4

850230 30 150 32 48

16 20 110 10 70 64 96

24 10 70 3 43 96 144

48 0 30 NA 16 192 288

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 331 332

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