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Telephone Test Head Type 4602-B

Accurate, repeatable handset positioning for electroacoustic tests, Type 4602-B supports ITU-T recommendations, mobile/cordless telephones, plus handsets with antennas.

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Telephone Test Head Type 4602-B

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Telephone Test Head Type 4602-B

General Description

Telephone Test Head Type 4602-B is a versatile positioning fixture designed for accurate and repeatable electroacoustic testing of telephone handsets, mobile phones, and cordless telephones.

It enables measurements to be performed in standardized speaking positions, including Loudness Rating Guard Ring Position (LRGP), Head and Torso Simulator (HATS), Acoustic Ear Reference Point (AEN), and Reference (REF/OREM A), helping manufacturers and test laboratories achieve consistent, comparable, and standards-based results.

The system has been specifically updated to accommodate modern handset designs, including devices with antennas, asymmetrical transducer placement, and varying form factors.

Key Features

  • Accurate and repeatable positioning of telephone handsets for electroacoustic measurements
  • Supports standardized testing in LRGP, HATS, AEN, and REF speaking positions
  • Compatible with a wide range of telephone handset designs, including mobile and cordless devices
  • Adjustable alignment rods and dedicated gauges for symmetrical and asymmetrical handsets
  • Revolving holder arm with calibrated force adjustment for fast, reliable setup
  • Spring-loaded artificial ear mounting minimizes acoustic leakage and improves measurement consistency
  • Optimized acoustic design reduces unwanted diffraction and reflections
  • High vibration damping supports accurate acoustical sidetone measurements
  • Adaptable for dedicated production-line positioning jigs and quality control fixtures
  • Upgrade path available for existing Type 4602 users

Measurement Description

Telephone Test Head Type 4602-B serves as the physical interface between a telephone handset and electroacoustic measurement equipment.

The fixture precisely positions the device under test relative to a Mouth Simulator and an Artificial Ear, ensuring repeatable test conditions and compliance with recognized telecommunications standards.

Adjustable alignment mechanisms, calibrated force settings, and configurable positioning jigs help maintain accurate handset placement across multiple designs. This enables reliable measurement of transmitter and receiver performance, supports type approval and conformance testing, and provides confidence that test results remain consistent from development through production. 

Typical Applications

  • Electroacoustic testing of telephone handsets and mobile telephones
  • Quality control of production batches
  • Quality assurance testing of representative samples
  • Type approval and regulatory conformance testing
  • Comparative performance evaluation of different handset designs
  • Testing handsets with antennas and asymmetrically positioned transducers
  • Research and development of telecommunications products

System Integration

Type 4602-B is designed to work seamlessly with Brüel & Kjær electroacoustic measurement solutions. It supports integration with Mouth Simulator Type 4227 and a range of Artificial Ears and Ear Simulators, including models that comply with International Electrotechnical Commission (IEC) and International Telecommunication Union Telecommunication Standardization Sector (ITU-T) recommendations.

The fixture provides easy access for calibration, accommodates dedicated customer-specific positioning jigs for automated quality control environments, and offers mounting provisions for production-line installations. This flexibility allows the same platform to be used across research, design validation, conformance testing, and manufacturing workflows. 

Terminology Explained

Electroacoustic Measurement: the process of measuring how electrical signals are converted into sound and how sound is converted back into electrical signals. In telephone testing, this includes evaluating microphone and receiver performance, sensitivity, frequency response, and overall acoustic quality.

Artificial Ear: a precision acoustic device that simulates the acoustic characteristics of the human ear. It provides a controlled and repeatable load for testing telephone receivers and other audio transducers.

Mouth Simulator: a calibrated sound source designed to reproduce the acoustic output of a human talker during telecommunications testing, enabling standardized transmitter measurements.

Sidetone Measurement: the assessment of how much of a user's own voice is heard through the telephone receiver during a call. Accurate sidetone control is important for speech quality and user comfort.

Telephone Test Head - Type 4602 Data Sheets English