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EDITOR’S CHOICE  NEWS


ACOUSTIC ANALYSER REDUCES SETUP TIME, BRINGING RELIABILITY & QUALITY TO MANUFACTURING


associated cabling. The system is


delivered with an accredited ISO/IEC 17025 calibration. Most, if not all, current acoustic analysis systems are an


A


udio Precision’s APx517B acoustic analyser is designed, configured and built for production-


line testing of speakers, microphones, headphones, headsets and the wide range of consumer electronics incorporating speakers and microphones. On a production line, any time spent setting up


a new test system, calibrating a system for a new shift, or reconfiguring a system for a change in DUT (device under test), is effectively a “line down” situation. As an integrated system combining audio analyser (signal generation and acquisition), power amplifier, headphone amplifier, and microphone power supply, along with any required digital interface such as Bluetooth, the APx517B can reduce setup and reconfiguration time by eliminating multiple individual components (from a variety of vendors) and their


assortment of individual components from different vendors. As such, an additional "line down" risk of these systems is the quality and reliability of each component, along with the configuration of each connection point. In contrast, the APx517B is an integrated system engineered and assembled to the same standard as all other APx analysers and is delivered with a three-year warranty and accredited calibration. For 36 years, the equal to AP analysers’ reputation for performance and measurement accuracy is the long-standing recognition of their quality and reliability. Cost sensitivity - whether test system cost or


the cost of any "line down" time - is a constant in manufacturing test. In addition to its ability to significantly impact the time component, the APx517B offers AP performance at a production


test price. The base model delivers measurement capability for the functional test of headphones, speakers, drivers and microphones. Configuring the system for specific DUT, interface or measurement requirements is equally affordable for manufacturers. In its base configuration, it is a ready-to-go


system. For digital devices, it has a module slot for the addition of a single APx digital interface module, such as Bluetooth, PDM or HDMI. On the software side, a standard system


provides a core set of measurements and functionality to allow out-of-the-box, fundamental test of acoustic devices: File Analysis, Sequence Mode, Input Signal Monitors (including FFT Monitor), Level & Gain, THD+N, Loudspeaker Product Test (including Rub & Buzz), Stepped Frequency Sweep, Pass/Fail, and Signal Acquisition measurement. As with APx500 Flex, a trio of Flex Packs is available, each offering different groups of more advanced measurements. Perceptual audio measurements - including


ABC-MRT and POLQA—can likewise be used with Flex. Finally, for the user that needs the base configuration plus just one or two more measurements, à la carte menu of measurements is available. www.ap.com


NON-CONTACT TORQUE SENSORS BASED ON FULL FOUR ELEMENT STRAIN GAUGE BRIDGE DESIGN


inductive coil, measures the differential values in each strain gauge and transmits them back to the stator digitally, via the same coil. The SGR510/520 series transducers then use state of the art strain gauge signal conditioning techniques to provide a high bandwidth, low cost torque measuring solution with high overrange and overload capabilities. “This design gives the TorqSense SGR510/520 several significant


advantages over conventional torque sensors,” says Mark Ingham of Sensor Technology. “Firstly, it eliminates the sort of noise pickup and signal corruption associated with slip ring and other analogue methods of transferring torque data from rotor to stator.” Mark explains that external noise pickup into the wiring is virtually


eliminated due to the short distance between the strain gauge elements and the rotor’s measuring circuits. Further, multipoint calibration reduces any linearity errors within the sensor. He goes on to say that the large functional overrange capability allows


Sensor Technology’s new TorqSense SGR510/520 series is based on a full four element strain gauge bridge design. The new units have a 250% overrange reading capacity, allowing sudden spikes in torque to be measured and recorded accurately. The design also compensates for any extraneous forces, such as bending moments, inadvertently applied to the sensor, improves sensitivity and has a wide temperature tolerance. The bridge is essentially four strain gauges glued onto the shaft that is


to be monitored in a square formation set at 45deg to the axis of rotation. Thus, when torque is applied to the shaft two gauges are stretched into tension and two go into compression. A rotor mounted ultra-miniature microcontroller, powered by an


/ ELECTRONICS


the peaks of a torque signal to be captured faithfully without any clipping when operating the sensor close to its full-scale rating. This, combined with a mechanical overload capability of over 400%, make the SGR510/520 series torque sensor a very robust torque measuring solution. The measuring range of the SGR series is 1Nm to 500Nm (with models up


to 13000Nm available shortly), accurate to +/-0.1% and with a resolution to +/-0.01% of the transducer’s full scale. The digital transmission between rotor and stator cuts out all cyclic fluctuation of the signal due to shaft rotation and generates a digital sample rate of 4000 samples per second. Other features include an optional adjustable moving average filter,


power supply range from 12VDC to 32VDC, user configurable analogue output voltages, a choice of RS232 communications, USB interface, CAN bus interface, external Ethernet gateway, and LabView virtual instruments. www.sensors.co.uk


ELECTRONICS | NOVEMBER 2020 5


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