Power Testing (PWT) - Deprecated

• Long term driver testing without sensor
• High-speed temperature monitoring
• Ideal for thermal parameter measurement
• Full mechanical identification of transducers (woofer, micro-speaker)
• Mechanical and thermal load versus time
• Permanent identification of voice coil offset and fs (no persistent excitation by stimulus required)
• Monitors destruction process
• User defined failure limits
• Measures up to 8 DUTs simultaneously
• Stand-alone operation
• Driver status displayed on hardware
• Analysis of recorded measurement
• Internal signal generator
• Stimulus shaping/filtering
• Variable slope (6,12, and 24 dB in high-pass and low pass filter)
• Any external signal (music)
• Control of amplitude at terminals
• Stepping amplitude
• Cycle scheme (ON/OFF)

The Power Test Module (PWT) and the hardware platform Power Monitor 8 (8 channels) allow performing destructive tests of transducers with permanent monitoring of electrical, mechanical and thermal state variables and parameter variations. An externally or internally generated excitation stimulus may be controlled in amplitude, spectral bandwidth or crest factor and may be supplied to the transducer permanently. The increase of the voice coil temperature can be measured by monitoring the electrical impedance of the speaker using a conventional AC-coupled amplifier (The mechanical parameters and the instantaneous displacement of a transducer can be monitored by impedance measurements dispensing with acoustical, mechanical or thermal sensors). The speaker parameters and state variables are sampled periodically and stored in a buffer in the hardware unit. Connecting a computer via USB to the hardware platform allows for viewing and investigating the destruction process in detail. This information is crucial for finding the physical cause of the failure and for understanding the temporal order of the destructive events. This enables the user to assess the maximal limits of the transducer more precisely.