Atec Bruel-Kjaer-2250-2270 - Manual (Page 16)

16
Software Specifications – Frequency Analysis Software BZ-7223
The specifications for BZ-7223 include the specifications for Sound Level
Meter Software BZ-7222. BZ-7223 adds:
Standards
Conforms with the following National and International Standards:
• IEC 61260 (1995–07) plus Amendment 1 (2001– 09), 1/1-octave Bands
and 1/3-octave Bands, Class 0
• ANSI S1.11–1986, 1/1-octave Bands and 1/3-octave Bands, Order 3,
Type 0–C
• ANSI S1.11– 2004, 1/1-octave Bands and 1/3-octave Bands, Class 0
Input
CHANNELS (TYPE 2270 ONLY)
All measurements are made from either Ch.1 or Ch.2
Frequency Analysis
CENTRE FREQUENCIES
1/1-oct. Band Centre Frequencies: 8 Hz to 16 kHz
1/3-oct. Band Centre Frequencies: 6.3 Hz to 20 kHz
MEASUREMENTS
X = frequency weightings A, B, C or Z , Y = time weightings F or S
Data for Storage
Full Spectral Statistics
Spectra for Display and Storage
Spectra for Display Only
Single Values
MEASURING RANGES
When using Microphone Type 4189:
Dynamic Range: From typical noise floor to max. level for a pure tone
signal at 1 kHz 1/3-octave: 1.1 to 140 dB
Linear Operating Range: In accordance with IEC 61260, 1/3-octave:
 20.5 dB 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
XF
or L
XS
:
• Statistics L
XFN1-7
or L
XSN1-7
are based on sampling L
XF
or L
XS
,
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
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
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
L
Xeq
L
XSmax
L
XFmax
L
XSmin
L
XFmin
L
XS
L
XF
L
XYN1
L
XYN2
L
XYN3
L
XYN4
L
XYN5
L
XYN6
L
XYN7
SIL PSIL SIL3
L
Xeq
(f1-f2) a
a where f1 and f2 are frequency bands in the spectrum.
NR NR Decisive Band
RC RC Classification
NCB NCB Classification
NC NC Decisive Band
Loudness Loudness Level