Low noise accessory enhances electro-acoustic test

In the frequency range of 10Hz to 20kHz, the instrument’s residual THD+N is ≤ -106dB (80kHz BW), and frequency response is ±0.08dB (DC-coupled).

The system’s power amplifiers are configured as two independent channels, with power ratings up to 100W for a single channel into 8Ω. Voltage taps across integrated current-sense resistors in the amplifier outputs enable easy impedance measurements.

For microphones, either as measurement mics or as the device under test (DUT), the APx1701 is equipped with pairs of balanced and unbalanced microphone inputs.

The balanced inputs include switchable +48 V phantom power, while the unbalanced inputs support switchable CCP (Constant Current Power) and are TEDS-capable (Transducer Electronic Data Sheet).

Whether in the lab characterising a design’s performance or conducting QA-testing on the production line to ensure products meet their specifications, confidence in the resulting measurements is key.

Like the APx500 Series audio analysers it is designed to complement, the APx1701 is a calibrated instrument under ISO / IEC 17025:2005 and all new units ship with an Accredited Calibration. Calibration provides documented and traceable verification that instruments meet or exceed all of their published specifications.

The increasing complexity of audio devices (wireless Bluetooth speakers or active noise-canceling headphones, for example) is driving ever-more complicated test scenarios, especially if engineers have to repeatedly switch measurement instruments.

As an electro-acoustic test accessory, the APx1701 is directly integrated with APx500 audio measurement software and, when paired with any APx500 Series analyser, provides an integrated platform capable of evaluating the performance of electro-acoustic devices as well as their analogue and digital components.