Voice Coil Temperature

Large Signal Identification (LSI3)

LSI3 measures the resistance of the cold transducer at very low frequencies at the beginning of the measurement. This value is used as a reference for calculating the increase of the voice coil temperature during the following identification process.

Power Testing (PWT)

PWT adds a pilot tone of 1 - 4 Hz of low amplitude to the excitation signal generated by the internal generator or to the external audio signal. Thus, the temperature can also be measured during an off-cycle when no regular stimulus is supplied to speaker. The power test provides an ultra-fast sampling of the voice coil temperature (100 ms) to measure the temperature variation at high temporal resolution. 

3D Distortion Measurement (DIS)

DIS provides a special measurement (pilot tone at 375 / 750 / 2250 Hz) which estimates the voice coil temperature at sufficient accuracy to protect the transducer under test. 

LAA measures the DC resistance of a transducer by adding a pilot tone of low amplitude to the excitation signal. The pilot tone is added to the signal provided by the computer, thus temperature measurement during off-cycles is supported. For external signals, the user may specify a single tracking frequency, or uses a whole tracking band with sufficient excitation.

MTON measures the DC resistance of the DUT to monitor the increase of voice coil temperature by adding a low-frequency pilot tone to the multi-tone stimulus.

Thermal Parameters (woofer)

Analysis of heat transfer in woofers based on identified thermal woofer parameters

Thermal Parameters AN 18

Thermal Parameters measured by using PWT module according Application Note 18

Thermal Parameters AN 19

Thermal Parameters measured by using PWT module according Application Note 19

LSI Woofer Nonl.+Therm. Sp1

Nonlinear and thermal parameters of woofers with fs < 300 Hz at standard current sensor Sp1

LSI Woofer+Box Nonl. P Sp1

Nonlinear parameters of woofers operated in free air, sealed or vented enclosure with a resonance frequency fs < 300 Hz at standard current sensor Sp1

DIS Compression Out(in)

Output amplitude versus input amplitude at four frequencies

DIS Harmonics vs. Voltage

Harmonic distortion measurement versus amplitude

DIS SPL, Harm protected

Harmonic distortion measurement with protection

SIM Compression Out(In)

Output amplitude versus input amplitude at four frequencies using large signal parameters imported from LSI; Simulated results are comparable with DIS Compression Out(In).

SIM Therm. Analysis (1 tone)

Heat transfer based on thermal parameters imported from LSI using a single-tone stimulus

SIM Therm. Analysis (2 tone)

Heat transfer based on thermal parameters imported from LSI using a two-tone stimulus

PWT 8 Woofers Param. ID Noise

Parameter identification of woofers using internal test signal (no cycling, no stepping)

PWT EIA accelerated life test

Accelerated life testing according EIA 426 B A. 4 using any external signal to monitor temperature, power and resistance

PWT IEC Long term Voltage

Power test to determine long-term maximal voltage according IEC 60268-5 paragraph 17.3 without parameter measurement for one device monitoring voltage, resistance, temperature and power

PWT IEC Short term Voltage

Power test to determine short term maximal voltage according IEC 60268-5 paragraph 17.2 without parameter measurement applied to 1 DUT monitoring temperature, power and resistance

PWT Powtest (fast Temp.)

Power test for fast monitoring of temperature, power and resistance without parameter measurement using external continuous signal (noise) supplied to IN1

PWT Powtest EXT. GENER.

Power test for monitoring temperature, power and resistance using external continuous signal (noise) supplied to IN1

PWT Powtest LIMITS

Power test to find maximal input voltage, power and temperature limits without parameter measurement applied to 1 DUT

PWT Powtest MUSIC

Power test without parameter measurement monitoring temperature, power, voltage and resistance using any external signal

PWT Powtest SWEEP

Power test for measuring the thermal time constant of the voice coil using sweep signal with low crest factor

PWT Powtest TIME Const.

Power test for measuring time constant of voice coil using internal test signal with cycling (ON/OFF phase)

PWT Woofer Param. ID MUSIC

Parameter Identification of Woofers

using external test signal (no ON/OFF cycling, no stepping)

PWT Woofer param. ID NOISE

Parameter Identification of Woofers

using internal test signal (no ON/OFF cycling, no stepping)