B&K 2250 Light Manual do Utilizador descarregar pdf (Página 218)

Hand-held Analyzer Types 2250 and 2270 – User Manual

206

Linear Operating Range: In accordance with

IEC 61260, 1/3-octave:  20.5 to 140 dB

SAMPLING FOR OCTAVE OR 1/3-OCTAVE

STATISTICS

X = frequency weightings A or B

The Statistics can be based on either L

or L

•Statistics L

XFN1-7

or L

XSN1-7

are based on sampling

or L

, respectively, every T ms into 1 dB wide

classes over 150 dB;

T = 100 for frequency range set to 12.5 – 20 kHz

T = 200 for frequency range set to 6.3 – 20 kHz

Full distribution can be saved with measurement

Displays

MEASUREMENT DISPLAYS

Spectrum: One or two spectra superimposed + A/B

and C/Z broadband bars

Table: One or two spectra in tabular form

Y-axis: Range: 5, 10, 20, 40, 60, 80, 100, 120, 140 or

160 dB. Auto zoom or auto scale available. Sound

data are displayed as dB values, vibration data as dB

values or in physical units (SI units (m/s2) or US/UK

units (g)), direct data as voltage in dB or V.

Cursor: Readout of selected band

Generator

INTERNAL GENERATOR

Built-in pseudo-random noise generator

Spectrum: Selectable between Pink and White

Crest Factor:

Pink Noise: 4.4 (13 dB)

White Noise: 3.6 (11 dB)

Bandwidth: Selectable:

• Lower Limit: 50 Hz (1/3-oct.) or 63 Hz (oct.)

• Upper Limit: 10 kHz (1/3-oct.) or 8 kHz (oct.)

Output Level: Independent of bandwidth

• Max.: 1 Vrms (0 dB)

• Gain Adjustment: –60 to 0 dB

When bandwidth is changed, the level for all bands is

automatically adjusted to comply with the set output

level

Correction Filters: For sound sources Type 4292,

Type 4295 and Type 4296: Flat or Optimum

Repetition Period: 175 s

Output Connector: Output socket

EXTERNAL GENERATOR

Selectable as alternative to Internal Generator (for

microphone input only)

To control external noise generator, set:

• Levels: 0 V (Generator off), 4.5 V (Generator on)

• Rise-time and Fall-time: 10 s

The noise generator is turned on and off automatically

during the measurement

Escape Time: 0 to 60 s

Build-up Time: 1 to 10 s

The generator can be turned on and off manually for

checking equipment and sound levels

Software Specifications – Logging Software BZ-7224

The specifications for BZ-7224 include the specifi-

cations for Sound Level Meter Software BZ-7222. BZ-

7224 adds:

Logging

MEASUREMENTS

Logging: Measurement data logged at pre-set periods

into files on:

• SD Card: All hardware versions

• CF Card: Hardware versions 1 – 3

• USB Memory Stick: Hardware version 4

Logging Period: From 1 s to 24 hr with 1 s resolution

Fast Logging: L

, L

and L

Aeq

(sound input) or Fast

Inst, Slow Inst and Linear (vibration and Direct input)

can be logged every 100 ms, irrespective of logging

period

Broadband Data Stored at each Logging Interval:

All, or up to 10 selectable broadband sound data incl.

Trig. Input Voltage, Weather data, and L

Aeq,T,mov

(for

vibration and direct input: up to 5 parameters)

Broadband Statistics Stored at each Logging

Interval: Full distribution, or none (sound input only)

Spectrum Data Stored at each Logging Interval: All,

or up to three selectable spectra (license for BZ-7223

required)

Spectral Statistics Stored at each Logging Interval:

Full distribution, or none (sound input only, license for

BZ-7223 required)

Logging Time: From 1 s to 31 days with 1 s resolution

Measurement Total: For the logging time, in parallel

with logging: All broadband data, statistics and spectra

(license for BZ-7223 required)

MARKERS

One data exclusion marker and four user-definable

markers for on-line marking of sound categories heard

during the measurement

Events can be set manually

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B&K 2250 Light Manual do Utilizador Página 218

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