Product data

13
Linear Operating Range: In accordance with IEC 61672, A-weighted:
1kHz:
Single Range: 24.8 to 140 dB
High Range: 43.0 to 140 dB
Low Range: 24.8 to 110 dB
Frequency Analysis
CENTRE FREQUENCIES
1/1-octave Band Centre Frequencies: 63 Hz to 8 kHz
1/3-octave Band Centre Frequencies: 50 Hz to 10 kHz
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:
Single Range: 1.1 to 140 dB
High Range: 11.3 to 140 dB
Low Range: 1.1 to 110 dB
Linear Operating Range: In accordance with IEC 61260:
Single Range: ≤ 20.5 to 140dB
High Range: ≤ 39.1 to 140 dB
Low Range: ≤ 20.5 to 110 dB
Internal Generator
Built-in pseudo-random noise generator
Spectrum: Selectable Pink or White
Crest Factor:
Pink Noise: 4.4 (13dB)
White Noise: 3.6 (11 dB)
Bandwidth: Follows measurement frequency range
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.: 1V
rms
(0 dB)
Gain Adjustment: –80 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-L, Type 4295 and
Type 4296: Flat or Optimum
Turn-on Time and Turn-off Time: Equivalent to RT = 70ms
Repetition Period: 175s
Output Connector: Output Socket
Control: See Measurement Control
External Generator
Selectable as alternative to Internal Generator
For controlling external noise generator
Levels: 0 V (Generator off), 3.3 V (Generator on)
Rise-time and Fall-time: 10 μs
Control: See Measurement Control
Measurements
Measurements are done at a number of positions and categorised in
functions (L1 for Source Room levels, L2 for Receiving Room levels, B2
for Receiving Room Background noise levels and T2 for Receiving Room
Reverberation Time measurements)
LEVELS L1, L2 AND B2
L
ZF
spectrum for display only
L
Zeq
in 1/1-octave or 1/3-octave bands
L1 and L2 simultaneously or as single channels
Averaging time: 1 s to 1 hour
Range (L1 and L2 simultaneously only): Autorange or manually set to
High Range or Low Range
Averaging: Up to 10 source positions each with up to 10 measurement
positions or up to 100 measurements may be averaged
Status Indications: Overload, under range, etc.
Crosstalk:
5 Hz – 10 kHz < –110 dB
10 kHz – 20 kHz < –100 dB
REVERBERATION TIME T2
T20 and T30 in 1/1-octave or 1/3-octave bands
Decays: L
Zeq
spectra sampled at 5 ms intervals
Evaluation Range: –5 to –25dB for T20 and –5 to –35 dB for T30
Measurement Time: Automatic selection of measurement time for the
decays based on the actual reverberation time of the room
Maximum Measurement Time: From 2 to 20 s
Averaging: T20 and T30 measurements can be averaged (arithmetic
averaging or ensemble averaging)
T20 and T30 Calculation: From slope in evaluation range
Slope Estimation: Least squares approximation
Quality Indicators: Quality indicators with status information like
Overload, Curvature in %, etc.; extensive list of Status information
Quality Indicators are available on reverberation time spectra for each
frequency band, and as overall quality indicators for each measurement
position and for the averaged result
Reverberation Time Range: Max. 20 s, min. 0.1 – 0.7 s, depending on
bandwidth and centre frequency
Manual Data Entry: A T2 value may be entered in any frequency band of
a measured spectrum
Measurement Displays
OVERVIEW
Table of measurement positions for each function (L1, L2, B2 or T2) with
readout for selectable frequency band on each position together with
quality indicator.
Positions can be included/excluded from average
SOUND LEVEL SPECTRUM
LZF spectrum plus A and C broadband bars
L
Zeq
spectrum for L1@Pos, L2@Pos, B2@Pos, L1, L2, B2, L1-L2, L2-B2
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 quality indicator for each frequency
band
REVERBERATION TIME SPECTRUM
One or two spectra can be displayed
Y-axis: Range: 0.5, 1, 2, 5, 10 or 20 s. Auto zoom available
Cursor: Readout of selected band quality indicator for each frequency
band
SPECTRUM TABLE
One or two spectra can be displayed in tabular form
DECAY
Decay curve for a position or the room average available for each
frequency band (if Ensemble Average selected)
Display of evaluation range and regression line
Readout of Curvature in %
Y-axis: Range: 5, 10, 20, 40, 60, 80, 100, 120, 140 or 160 dB. Auto zoom
or auto scale available
Result Displays
OVERVIEW
Table of measurement positions for all functions (L1, L2, B2 or T2) with
readout of quality indicators.
Positions can be included/excluded from result
CALCULATIONS
Shows the sound reduction index (spectrum and weighted) according to
the selected standard, along with the reference curve (if any), or
deviations (from the reference curve). See Table 2 on page 9