PRODUCT DATA
PureSound
SPEAKER TEST SYSTEM
Key features for a modern, state-of-the-art test system are speed, simplicity, reproducibility and
automation in a factory environment. The PureSound speaker test system exactly answers these
needs. The key element is the unique Rub & Buzz defects analysis with a 100% correlation to the
human ear. It replaces the subjective human ear perception against an objective, reliable and repeatable test feature.
The PureSound speaker test system is based on the FX100 Audio Analyzer, operated via the PCbased turnkey production software RT-Speaker. It is tailored for the total quality control of single
components, pre-assembled parts or finished products.
Key Features:
• Speed: Cycle time down to 1 second based on speaker
type.
• Accuracy: The FX100 Audio Analyzer is based on reliable technologies providing accurate and consistent test
results.
• Rub&Buzz: Superior Rub&Buzz defects detection with a
100% correlation to the human ear. Objective Rub&Buzz
testing replaces subjective golden ears.
• Noise Immunity: Maximum performance in noisy production environment using dedicated technologies.
• System Integration: Tailored for automated production
lines with PLC interface, barcode reader or remote control via TCP/IP commands; offering full data logging and
statistics (e.g. Cpk, Ppk).
• Multi-Channel Operation: Testing two DUTs in parallel or
multiple DUTs sequentially without any operator interaction.
Multimedia speaker testing
Mobile Devices
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Pro Audio Loudspeaker
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PRODUCT DATA
INTRODUCTION
Electro-acoustical transducers naturally bear a particularly high error rate. Sorting out faulty devices
in an early production stage increases the overall yield and reduces the cost of waste material and
optimizes the quality of the manufactured goods. The FX100 Audio Analyzer and the production
software RT-Speaker form together the PureSound Speaker Test System comprising exactly the
required features for quality control and production line testing.
Basic Speaker Test Configuration
Test Functions:
• Frequency Response
• Sound Pressure Level dBSPL
• Rub & Buzz analysis with100% correlation to the human ear
• Impedance Response & Resonance Frequencies
• Distortion THD, THD+N, 2nd - 35th harmonics
• Speaker Polarities
• Thiele/Small Parameters
• DC Resistance
PureSound detects any audible manufacturing flaws of speakers or transducers, such as air-leaks,
misaligned coils, rubbing voice coils, loose particles, touching wires etc.
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SIMPLE AND INTUITIVE OPERATION
The PureSound speaker test system is setup and configured within a few minutes. The FX100 Audio
Analyzer communicates with the PC-software RT-Speaker via the USB interface. RT-Speaker provides an intuitive user interface for test setup and display of all measurement results.
The main menu guides the production administrator through the basic system configuration on to
the test parameter settings, which are contained in a single “Project“ folder. After an automated calibration sequence the reference measurements can be recorded, tolerances automatically calculated
and the Production Mode started. The RT-Speaker software provides a simple PASSED/FAILED
readout or a detailed view of all measured speaker parameters.
PC-Software RT-Speaker
The key element is the Rub&Buzz test technology with a unique and reliable defects analysis. The
cycle time may be set down to 1.0 second (based on the speaker type) for a complete test including
the outstanding Rub&Buzz analysis.
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UNIQUE RUB & BUZZ TEST IN TIME DOMAIN
The patented measurement technology enables the PureSound speaker test system to conduct fast
and reliable Rub&Buzz tests with a perfect equivalence to the human “Golden Ear”.
TECHNOLOGY:
Gliding chirp triggers
all frequencies
The measured signal is first processed with a filter bank, simulating the psycho-acoustic perception of the human ear. Then
the Transient Steepness Analysis is carried out by differentiation and rectifying the time signal. The result displays all sound
energy changes audible to the human ear.
PureSound filters
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100% CORRELATION TO HUMAN EAR
The NTi Audio Rub & Buzz test technology is the outstanding approach for perceptual audio testing in the time domain. The algorithms model the human ear
as a transient analyzer, effectively measuring every audible manufacturing imperfection with an unmatched correlation to the acuity of “Golden Ears” – “You
measure what you hear”. This correlation allows cost saving and much improved
test accuracy by replacing the subjective “Golden Ear“ with a successful and
objective Rub & Buzz test.
In the past “Golden Ear“ tests have been carried out based on the judgment of
individual persons, which may even vary over time as the human ears tire during
the day. PureSound offers a 100% repeatable, objective Rub&Buzz test at any
location around the globe.
PRODUCTION NOISE IMMUNITY
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PureSound measures Rub&Buzz even in noisy factory environments. An effective, advanced noise cancellation algorithm eliminates non-correlating signal
components from the test signal, thus immunizing the measurement process
against factory noise. The typical test time is one second.
Rub & Buzz analysis: Loose particles
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PRODUCT DATA
Rub & Buzz analysis: Rubbing voicecoil
DETECTING SLIGHTEST RUB & BUZZ DEFECTS
PureSound provides a complete speaker or transducer characterization, detecting even the most subtle manufacturing flaws of speakers or transducers,
such as air-leaks, misaligned coils, rubbing voice coils, loose particles, touching
wires or defects from any other cause, also supporting the automatic qualification of the nature of these defects.
PURESOUND IN R&D
PureSound acquires “fingerprints” of speaker non-linearity’s to compare developments in every design stage over its entire life. Such a continuous Rub &
Buzz measurement monitors the objective quantification of design changes to
audible effects, minimizing design flaws. As lower the measured Rub & Buzz
is in the development stage as better are the test results of the final product.
Furthermore in the supplier selection process different speaker-samples can be
compared against each other in order to choose the sample with lowest Rub &
Buzz for the final product.
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PRODUCT DATA
Rub & Buzz analysis: PASSED loudspeaker
COMPARING PURESOUND AGAINST CONVENTIONAL METHODS
Rub & Buzz defects are audible for the human ear, but hard to measure with
older measurement techniques. Tests carried out in the frequency domain, such
conventional FFT spectrum analysis or high order harmonic tracking filters, typically fail to discriminate short instantaneous Rub&Buzz effects like loose particles. The test results may not correlate with the human hearing at all since the
energy content of the signal caused by the defect is not sufficient and consistent
for FFT measurements. PureSound is the solution for today’s quality control. It
ensures the delivery of final-branded units without audible defects, reduces warranty returns and prevents unnecessary shipping costs, missed deadlines and
customer claims.
Fast Measurements
The default measurements are carried out with a logarithmic sine sweep signal.
A dedicated technology ensures best noise immunity even in noisy production
environments.
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The fast sweep signal serves as stimulus for simultaneous measurements of:
• Frequency Response
• Sound Pressure Level dBSPL
• Impedance Response & Resonance Frequencies
• Distortion THD, 2nd - 35th harmonics
• Individual driver Polarities
• Thiele/Small Parameters
This highly accurate and repeatable set of measurements typically occupies the
device under test for one second. All completed measurements are compared
in real-time against user-defined tolerances for individual PASSED/FAILED decisions.
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FREQUENCY SWEEP WITH TOLERANCE CLASSES
The smart “learn-mode” simplifies tolerance definition by feeding the system
with a representative set of one or more “Golden Samples”. The unique tolerance management derives its tolerance criteria automatically and supports up
to five different quality clusters, which may be user-defined in any language,
such as “Excellent”, “OK”, “Acceptable”, “Class 3” and “Reject”. This enables
the manufacturer e.g. to charge a premium for selected “Excellent” products or
match speaker pairs for stereo applications.
Frequency response measurement with absolute results
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Meeting individual customer requirements, the PureSound speaker test system
measures up to 5 different resonance frequencies, speaker polarities and sound
pressure levels at once. This is of great help e.g. for performance verifications
at speaker systems with woofer, mid-range or tweeters installed or ensuring a
minimum sound level at different frequencies or frequency ranges.
DISTORTION TESTING
The distortion measurement includes THD, THD+N, individual 2nd to 35th harmonic and sum of multiple harmonics. The non-linear behavior of the device
may be assessed simultaneously with the frequency response test or examined
via a separate sweep. All measurements are optimized for speed to maintain
maximized throughput for production lines.
Distortion measurements have been proven inadequate for reliable defects detection, its presence is not intended to replace the unmatched sensitivity and
accuracy of the PureSound Rub & Buzz measurement! Distortion is just another
useful tool valuable for correlation to R&D specifications, e.g. at sampling inspections.
PRODUCT DATA
Distortion analysis THD
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THIELE/SMALL PARAMETERS
The FX100 Audio Analyzer measures the Thiele/Small parameters DC-resistance
Rs, R, R0, Qms, Qes, Qts, C, L and df without extending test time. All parameters are tested with one very fast single sweep signal. The results are compared
against tolerance limits in real time for an accurate PASSED/FAILED test result.
The sensitive T/S parameters are an excellent monitoring base for the integrated
CPK/PPK module, effectively supervising the stability of the production process.
AUTOMATION IN PRODUCTION LINES
System integration into existing high volume production lines and connection
to host controllers is very simple, as the speaker test system supports remote
control via TCP/IP commands. The patented measurement algorithms have
been optimized for factory noise immunity. This maximizes your production line
yield and allows conducting the same measurement in R&D as well as in the
production floor. Measurements can be started by an external button or automatically as the speaker is connected. The FX100 Analyzer offers an integrated
DIO-Interface for automated operation, such as
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• Connection to external PLC
• Test result indication to the operator
• External pre- or post-test actions independent of test result
• Automated splitting of PASSED/FAILED samples
• Individual bin splitting of different FAILED samples
Bins with
FAILED
SPL
Rub
Automated splitting in FAILED production bins
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f0
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SERIAL NUMBER HANDLING
RT-Speaker offers manual and automatic serial number handling. Flexible bar
code interpretation extracts the model type and loads the corresponding project
file automatically. For example a widely varied mix of different speakers can be
tested sequentially without even touching the keyboard of the controlling PC.
ONLINE PRODUCTION MONITORING
Complete measurement setups can be exported from the customer or engineering PC and sent by e-mail to the assembly line reducing time and installation
efforts. The actual production test results can be monitored over the web around
the globe. An activated TCP/IP-link to a server gives direct access to measurements, pre-set tolerances and the production statistics.
PRODUCT DATA
DATA LOGGING
All test results are automatically stored as log-files, which can be opened with
e.g. MS Excel. This simplifies the utilization of spreadsheet or data-mining software. The user has the choice between single, batch, daily or weekly log-files
with individually specified logging data. This feature supports detailed quality
monitoring for after-sales service and simplifies data comparisons of returned
speakers, a valuable add-on for speaker manufacturers or rental companies.
STATISTICAL PROCESS CONTROL (SPC)
Statistical data is calculated on the fly while the production tests are running.
The detailed histogram, trend analysis and Cpk/Ppk values (=short/long term
production variation) provide a clear assessment of the currently manufactured
quality level.
Speaker parameters are very sensitive to changing environmental factors, such
as temperature and humidity. RT-Speaker offers detailed on-line correlation of
test results with the actual temperature & humidity using the optional Environmental Sensor. The trend monitor supports identifying failed speaker batches
due to environmental effects and highlights necessary calibrations or reference
sampling for maintaining reliable PASSED/FAILED test results at the same time.
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PRODUCT DATA
Statistical trend analysis correlated with the environmental temperature
Applications
BASIC SPEAKER TEST CONFIGURATION
The basic system configuration is quickly set up and ready
to go for measurements within a few minutes. For noisy production environments an acoustically shielded test-box is
recommended. The measurement microphone distance to
the speaker under test is commonly equal or higher than the
speaker diameter.
Regardless whether it is a passive or an active system, RTSpeaker evaluates the complete performance of the system
cabinet. All speakers can be tested at once or sequentially using various available test configurations.
In a passive system, the impedance measurement enables RTSpeaker to record the impedance plot and identifies multiple
resonance frequencies from several drivers.
M2010
FX100 Audio Analyzer with FX-SIP
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WOOFER TESTING
Woofers with large mechanical dimensions are challenging objects for quality control. The transfer function and acoustical
performance needs to be measured in axis from the front.
A woofer with its big membrane area and low frequency characteristics acts more or less like a piston with very large excursions. It is obvious that manufacturing defects are most audible close to the motor itself. The front microphone inside the
test box is somewhat shielded by the membrane and in some
cases not very effective. With a second microphone mounted
at the rear-side, any Rub & Buzz can be measured, which is
not audible from the front.
The offered DC resistance measurement ensures accurate
Thiele/Small parameter testing for all woofer types.
System includes:
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M2010
M2010
FX100 Audio Analyzer with FX-SIH & FX-IS
• 1x FX100 Audio Analyzer
• 1x Speaker Impedance Module FX-SIH
• 1x Input Switcher Module FX-IS
• 1x RT-Speaker Software including PureSound Rub & Buzz
• 2x Measurement Microphone M2010
• 1x Audio Amplifier
STEREO CONSUMER PRODUCT TESTING
Automated testing of consumer products with multiple inputs
and electrical or acoustical outputs is supported by the PureSound speaker test system. The individual acoustical performance of Left/Right speakers is typically measured in sequential order.
Additional microphones or vibration sensors may probe for
housing vibrations or loose grids. Input- and Output Switcher
Modules may be integrated for such comprehensive matrix
testing.
System includes:
M2010
CH1
CH1
UNBAL
UNBAL
max.
200VAC
UNBAL
UNBAL
Analog Analyzer
Analog Generator
CH2
CH2
FX-GEN
FX-ANA
Auxiliary I/O
Power:
Fuse:
90 – 264 VAC
FX100 -1.6A
47 – 63 Hz
FX200 -3.15A
FX-CTRL
FX100 Audio Analyzer
M2010
USBUSBLAN
Controller
• 1x FX100 Audio Analyzer
• 1x RT-Speaker Software including PureSound Rub & Buzz
• 2x Measurement Microphone M2010
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TV testing configuration
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Optional:
• 1x Input Switcher Module FX-IS
• 1x Output Switcher Module FX-OS
100 V SPEAKER TESTING
The PureSound speaker test system allows impedance response- & resonance frequency testing of 100 V speakers,
which are often used in public address systems. Lower speaker test voltages, such as 75 V, 50 V, 25 V are also supported.
In the past the speaker and the 100 V transformer had to be
tested separately as individual components. The complete assembly could not be tested. Assembling faults often have been
detected at the actual speaker installation on-site only.
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M2010
LINE
Voltage Range:
85 - 264 VAC
Frequency Range:
47 - 63 Hz
Power Fuse:
RT-IB 100VRT-IB 100V
T2.5A / 250V
To Rapid Test
100V Impedance Box
+
(Measure OUT)
+
(Signal IN)
from Amplier
Fuse:
use only type
from NTI
F 3A F 1A F 175mA
FSF 6.3x32 (250V)
Fuses
F2F1
F3
to Speaker
(Signal OUT)
The PureSound speaker test systems offers the all-in-one solution for testing the completely assembled 100 V speaker with
transformer. The RT-IB 100V Impedance Box enables impedance measurements up to 30 kW, allowing to test all powertaps of a 100 V speaker transformer.
System includes:
CH1
CH1
UNBAL
UNBAL
max.
UNBAL
UNBAL
Analog Generator
CH2
CH2
FX-GEN
FX-ANA
• 1x FX100 Audio Analyzer
• 1x RT-Speaker Software including PureSound Rub & Buzz
• 1x RT-IB 100 V Impedance Box
• 1x M2010 Measurement Microphone
MOBILE PHONE SPEAKER & RECEIVER TESTING
Telecom transducers are very small yet important components in modern mobile
phones. Best performance over a wide frequency range and as small as possible is expected. Their naturally high problem rates may result in high costs
for waste goods from finished materials. Nowadays manufacturers increase the
production yield by a 100% quality control of the individual component, the preassembly and finally the completed phone. Especially the PureSound Rub&Buzz
test is of great help to filter out any products with abnormal noise as early
as possible, thus final testing of completed phones achieves close to a 100%
PASSED rate and best performance. Vibration motor testing is included!
100V Amplifier
USBUSBLAN
Auxiliary I/O
200VAC
Analog Analyzer
Controller
Power:
Fuse:
90 – 264 VAC
FX100 -1.6A
47 – 63 Hz
FX200 -3.15A
FX-CTRL
FX100 Audio Analyzer
The mobile phone test adapter TA2010 or artificial ears (type IEC 318 or IEC
711) are available, which simulate the acoustical conditions at the human ear.
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They are typically used for mobile phone receiver testing.
System includes:
• 1x FX100 Audio Analyzer
• 1x Speaker Impedance Module FX-SIP
• 1x RT-Speaker Software including PureSound Rub & Buzz
• 1x M2010 Measurement Microphone or Artificial Ear
• 1x Audio Amplifier
PRODUCT DATA
M2010
Microphone
FX100 Audio Analyzer
with FX-SIP
Telecom transducer test setup; FX100 Audio Analyzer with FX-SIP
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ORDERING INFORMATION
Basic Configuration
• FX100 Audio Analyzer
• Speaker Impedance Module
• FX-SIP (with built-in 30 W amplifier)
• FX-SIH (for high power speakers, requires external amplifier)
• RT-Speaker Software including PureSound Rub & Buzz
• Power Amplifier
• 1/2“ Measurement Microphone class 1 frequency response,
• M2010: SPL max = typ. 145 dB
• M2015, SPL max = typ. 155 dB
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FX100 Modules
• Input Switcher Module FX-IS
• Output Switcher Module FX-OS
• Channel Extension 2CH -> 4CH
• FX-AES (for digital audio loudspeakers)
Accessories
• Input Switcher IS-1002
• Output Switcher OS-0210
• Environmental Sensor
• Class 1 Sound Calibrator
• RT-IB Impedance Test Box for 100 V speaker applications
Automation Accessories
• Digital I/O Adapter for FX100
• Digital I/O Card, 6503, 6528,
• Digital I/O 6501, USB
Artificial Ear
• Kit Artificial Ear
• ICP or 200 V Microphone, IEC318 or IEC711, including pre-amplifier and power supply
(available with special mounting fixture to test stand)
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Other Turnkey PC-Software
RT-Microphone
Microphone Production Testing
SPECIFICATIONS
Analog Generator
Test Signals Sine, StepSweep, GlideSweep, White Noise
Level Range 10 μV to 12.45 V (-100 dBV to 21.9 dBV)
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Level
Accuracy
Level Flatness < ± 0.01 dB (10 Hz to 20 kHz)
Frequency
Range
THD+N • -104 dB @ 1 kHz, 0 dBV (typical)
Analog Analyzer
Measurement
Functions
Sweeps Frequency Sweep, Time Sweep, Level Sweep, Table Sweep
± 0.05 dB
5 Hz to 80 kHz
• ≤ -101 dB + 1.3 μV (20 Hz to 20 kHz fundamental, Lowpass 22 kHz)
• Level ( selective & wideband), Frequency, FFT, Gain,
THD, THD+N,
• Harmonics k2-k35, Phase, Crosstalk, Polarity, DC-Level, DC-Impedance,
• optional: PureSound™ Rub&Buzz
Speed Frequency response down to 200 ms from 20 Hz to 20 kHz
(GlideSweep)
Level Range <1.0 μV to 141 V (max 200 Vp), channel independent auto
ranging
Level
Accuracy
Level Flatness < ± 0.02 dB (20 Hz to 20 kHz)
Frequency
Range
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± 0.1 dB @ 1 kHz
DC, 5 Hz to 80 kHz
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THD+N • -104 dB @ 1 kHz, 0 dBV (typical)
• ≤ -104 dB + 1.5 μV (20 Hz to 20 kHz fundamental, LP
22 kHz)
Residual Noise ≤ 1.5 μV (20 Hz to 20 kHz bandwidth)
Filters • A-Weighting, C-Weighting, AES17 Brickwall
• Highpass 22Hz, Highpass 400Hz, Lowpass 22kHz
Crosstalk ≤ –120 dB + 1 μV to 20 kHz
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Input Bias
2 VDC, 48 VDC Phantom Power, ICP®
Supply
Input Coupling AC or DC
General
Channels • 2 or 4 Parallel Independent Inputs/Outputs Analog
• XLR and BNC connectors
Extension
3 empty slots @ Base Unit FX100 for modular extensions
Slots
Interfaces • USB 2.0 Communication to PC
• Headphone connector for audio out, 1/4”Jack Stereo
• LAN (prepared for later firmware extension)
Pass / Fail
Result
FX-Control
Suite
• Built in DIO-Interface controls external peripherals
• Dual color display with green/red indication
• PC Software with full access to all audio analyzer features
• Parallel measurements with internal/external triggering
• Calculation panels for mathematical processing of measurement data
• Result reporting: txt-files, csv-files or xlsx-files
• Full tolerance handling and hardware wiring diagram
Programming Supports .NET Assembly (e.g. C#.NET, Visual Basic.NET)
Design Desktop use or ½ size 19’’ rack mounting, 3 rack units high
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PRODUCT DATA
Overview test results
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