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Over the Air (OTA) Measurements

A good connection is essential for smartphones for stable voice calls and fast data transfers. Testlab measures over the air radio performance according to CTIA OTA Test Plan Revision 3 in a screened chamber with a TS9881 measurement system from Rohde & Schwarz. Please download the article if you want to know more of the capabilities of our OTA measurement system. 

 

Voice Call Quality measurement

The speech quality of smartphones is measured using highly specialised equipment from the renowned specialist Head Acoustics. A Head Acoustics Acqua front end is the heart of Testlabs measurement system for speech quality. The actual measurements are conducted using an artificial head placed in an anechoic chamber. They include legacy KPIs like loudness, distortion and frequency response as well as modern measures like speech ineligibility (TOSQA)  and noise cancellation (3QUEST)    

 

Battery Life Measurement

Modern smartphones are an important part of everybody's life, yet they lack endurance all so often. As an industry metric to judge smartphones has been missing for so long, Testlab has developed its own set of measurements. To bring the measurements in agreement with typical battery life under normal usage scenarios a number of studies have been conducted about how people use their smartphones. The Testlabs battery life measurements have been based on these studies and are regularly refined.  

 

Display Quality

The display is the most important interface between the smartphone and its owner. Yet display quality is often lacking, especially under bright sunlight and viewed from the side. To measure angle or ambient light dependent contrast ratio, color fidelity, mirroring and other important KPIs, Teslab uses a more than 100 kilo weighting piece of optical precision from Autronic-Melchers called DMS-703. To learn more about Display measurements click the button below.   

 

Turntables Measurement

Despite streaming services and CD the turntable is still very popular among audiophiles. With equipment from Audio Precision, Brüel & Kjaer and others Testlab has the means to measure wow & flutter, rumble, low frequency resonance, frequency response, tracking ability and all kinds of distortions. Well preserved test records from B&K, JVC and DIN (Beuth), calibrated cartridges and a spring suspended 200 kilo platform ensure the highest precision in measurements. With a complete set of KPIs Testlab can discern professional quality from me-too products. You want to know, if your turntable, tonearm or cartridge is ready to conquer the market? Ask us. We are ready to supply the answer.

 

amplifier measurement

Most amplifiers behave well in resistive loads. But real world loudspeakers often behave radically different. To take this into account, Testlab has developed its own and unique load with up to eight channels ranging from 1 to 8 Ohms and enabling phase shifts between -60 to +60 degrees in 20 degree increments for output power measurements. An amplifier working well under the strain of this load will behave well under any conditions. Of course Testlab can supply all kinds of measurements, like frequency response, distortion, S/N ratio for all kinds of electronics. And of course we can measure from 115 Volts/60 Hz an below to more than 230 Volt/50 Hz stabilised to a fraction of a Volt for up to 3200 Watts.        

 

Headphone measurement

Whenever the room is too small to accommodate a large loudspeaker, a headphone is a nice alternative for high quality sound reproduction. But it needs a high quality headphone to offer high fidelity performance. Testlab has set up a number of important measurements to judge frequency response, total harmonic, distortion, efficiency, and maximum sound pressure level. With these measurements based on equipment from Audio Precision, Brüel & Kjaer, Head Acoustics and others it is easy to review a headhone and evaluate its quality against the competition.      

 

Loudspeaker measurement

It takes a large, specialized room, expensive equipment and experience as well as knowledge to measure loudpspeakers correctly. Testlab has invested in a semi anechoic room, excellent equipment from Audio Precision and Brüel & Kjaer with custom built and programmed extensions to measure loudspeakers in a three stage process. In this way frequency response, frequency and level dependent distortion, compression, maximum SPL and frequency dependent impedance are measured without the influence of a room. This set of measurements offers a neutral determination of position in a highly competitive market. And it may bring a few hints for upgrades, to give you a helpful advantage against a stiff competition.