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TDT DPM1 Hardware Reference Manual

Distortion probe microphone system
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DPM1 Distortion Probe Microphone
System
Hardware Reference
Updated 2024-08-02

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Summary of Contents for TDT DPM1

  • Page 1 DPM1 Distortion Probe Microphone System Hardware Reference Updated 2024-08-02...
  • Page 2 DPM1 Distortion Probe Microphone System | 2 © 2016-2024 Tucker-Davis Technologies, Inc. (TDT). All rights reserved. Tucker-Davis Technologies 11930 Research Circle Alachua, FL 32615 USA Phone: +1.386.462.9622 Fax: +1.386.462.5365 Notices The information contained in this document is provided "as is," and is subject to being changed, without notice.

  • Page 3: Table Of Contents

    Table of Contents | 3 Table of Contents DPM1 Distortion Probe Microphone System Overview Microphone Kit Power Cable Connection Routine Care and Maintenance DPM1 Technical Specifications Frequency Response...

  • Page 4: Dpm1 Distortion Probe Microphone System

    DPM1 Distortion Probe Microphone System Overview The DPM1 Distortion Probe Microphone System measures distortion product otoacoustic emissions (DPOAE). It consists of a battery-powered signal conditioner and the probe microphone itself. It operates in the 1 kHz to 40 kHz range and can detect low intensity signals in the range of 0 dB SPL.

  • Page 5: Microphone Kit

    DPM1 Distortion Probe Microphone System | 5 Microphone Kit The DPM1 system kit includes: • DPM1_MIC - Microphone for Distortion Probe Microphone System • DPM1_SC - Signal Conditioner for Distortion Probe Microphone System...

  • Page 6: Power

    DPM1 Distortion Probe Microphone System | 6 • Four 9 V batteries • Assorted ear tips: ◦ Four each 4 mm, 5 mm, 6 mm ◦ Two each 8 mm, 10 mm, 13 mm, 16 mm • Four 10 cm pieces of PVC tubing: 1/16" ID, ⅛" OD, 1/32" wall Power The DPM1_SC is powered by two 9V batteries.

  • Page 7: Cable Connection

    This dissolves the wax in many cases. If there is still debris clogging the microphone hole, contact TDT for an RMA for repair. The outside of the DPM1 can be wiped down with isopropyl to sanitize it after each use.

  • Page 8: Dpm1 Technical Specifications

    DPM1 Distortion Probe Microphone System | 8 DPM1 Technical Specifications Microphone and Amplifier Gain 29 dB Total Sensitivity 600 mV per Pascal (-4 dBV) Undistorted output 108 dB SPL (3 V max) Noise Floor @1kHz (1 Hz BW) 3 uV (-17.5 dB SPL) Frequency Response ±2.5 dB from 3 kHz to 40 kHz...

  • Page 9: Frequency Response

    DPM1 Distortion Probe Microphone System | 9 Frequency Response The results of the calibration will vary depending on the type of ear to which the microphone is coupled and the length of the tube that is coupled to the ear. This curve is provided as representative of the type of response that may be obtained in a closed field.

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