Main Menu

See All Acoustic End-of-Line Test Systems See All DAQ and instruments See All Electroacoustics See All Software See All Transducers See All Vibration Testing Equipment See All Academy See All Resource Center See All Applications See All Industries See All Insights See All Services See All Support See All Our Business See All Our History See All Our Sustainability Commitment See All Global Presence

Main Menu

See All Actuators See All Combustion Engines See All Durability See All eDrive See All Production Testing Sensors See All Transmission & Gearboxes See All Turbo Charger See All Industrial electronics See All S&V Signal conditioner See All DAQ Systems See All Power Analyser See All S&V Hand-held devices See All High Precision and Calibration Systems See All Test Solutions See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All Test Data Management See All DAQ Software See All Drivers & API See All Utility See All Vibration Control See All Acoustic See All Current / voltage See All Displacement See All Load Cells See All Pressure See All Strain Gauges See All Vibration See All Torque See All LDS Shaker Systems See All Vibration Controllers See All Power Amplifiers See All Accessories for Vibration Testing Equipment See All Training Courses See All Acoustics See All Asset & Process Monitoring See All Custom Sensors See All Data Acquisition & Analysis See All Durability & Fatigue See All Electric Power Testing See All NVH See All Reliability See All Smart Sensors See All Vibration See All Weighing See All Automotive & Ground Transportation See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Release Notes See All Compliance See All Our People

Main Menu

See All QuantumX See All LAN-XI See All SomatXR See All MGCplus See All CANHEAD See All Optical Interrogators See All GenHS See All API See All Microphone Cartridges See All Microphone Sets See All Microphone Pre-amplifiers See All Sound Sources See All Acoustic Calibrators See All Special Microphones See All Accessories for acoustic transducers See All Experimental testing See All Transducer Manufacturing (OEM) See All CCLD (IEPE) accelerometers See All Charge Accelerometers See All Rotating See All Non-rotating (calibration) See All Electroacoustics See All Noise Source Identification See All Environmental Noise See All Sound Power and Sound Pressure See All Noise Certification See All Industrial Process Control See All Structural Health Monitoring See All Electrical Devices Testing See All Electrical Systems Testing See All Grid Testing See All High-Voltage Testing See All Vibration Testing with Electrodynamic Shakers See All Structural Dynamics See All Machine Analysis and Diagnostics See All Dynamic Weighing See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All On-Site Calibration See All Resources See All Software License Management

What is TEDS? (Transducer Electronic Data Sheet)

This article gives a quick overview of what the Transducer Electronic Data Sheet or "TEDS" microphone is, how it works, the benefits, and most importantly; how to choose the right TEDS transducer for your test and measurement needs.

Get expert advice about B&K microphones

TEDS Microphone Sensitivity

Stated as the nominal cartridge sensitivity except for ¼-inch and 1/8-inch cartridges where the loaded sensitivity differs considerably from the open circuit sensitivity.

* As an example, the supply voltage to a classical preamplifier is reduced from 120 V to 28 V or ±14 V the max. SPL may theoretically be reduced by up to 15.7 dB


Temperature Range for TEDS

The read-write temperature range of the TEDS chip is guaranteed by the chip manufacturer up to +85°C only (185°F) but the TEDS chip will survive the full specified temperature range of the TEDS microphone/preamplifier without any damage.

TEDS and Cable Length

TEDS is guaranteed to work properly with cable length up to 100 m (328 ft). Brüel & Kjær preamplifiers can drive very long cables. The cable length is limited though by the available output current of the preamplifier, especially in situations where high-frequency signals must be measured at high levels.


Making TEDS Smarter

Transducer Smart Setup is a mobile application that works in combination with data matrix codes (similar to QR codes™) on transducers. It's job? To simplify and automate multi-channel test setups, giving you instant access to specifications and calibration information.

Download Transducer Smart Setup



Conditioners and amplifiers



A wide range of TEDS (Transducer Electronic Data Sheet) microphones are available from Brüel & Kjær. A TEDS microphone consists of a microphone cartridge and a built-in microphone preamplifier, sealed to form a single unit called a TEDS microphone.

TEDS is standardized by IEEE and is supported by many front ends and signal conditioning amplifiers. This includes our LAN-XI Data Acquisition System, the NEXUS line of Conditioning Amplifiers, the 16-channel Conditioning Amplifier Type 2694, and others.

Designing and manufacturing all parts of the measurement chain ourselves gives unique integration benefits for the user. As an example, our LAN-XI Data Acquisition Systems automatically reads the data stored inside the transducer (when using TEDS-enabled sensors).


Benefits of TEDS

  • Plug and play facilities
  • Type, S/N, sensitivity, and more read indirectly from the transducer
  • Significantly reduced setup time
  • Practical elimination of cable routing errors
  • Transducer location can be read into the transducer
  • The TEDS microphone is assembled under controlled conditions

How does TEDS work?


Basically, the chip containing the TEDS data and TEDS interface is built into the microphone preamplifier. TEDS data is updated during the boot sequence or whenever “update TEDS” is activated.

TEDS data can be transmitted to the front-end in two different ways:


  • Class I TEDS – on the same wire as the analog signal
  • Class II TEDS – via a separate wire


Class I is always used with DeltaTron transducers since TEDS can be implemented using the traditional coaxial cable. For measuring microphones, Class II is the most commonly used and pin 5 (often denoted as “No connection” in PDs) is used to transmit the TEDS data. This is important when using extension cables as some older cables might really not have pin 5 connected, which will break the TEDS chain.

Since the TEDS microphone has been assembled under controlled conditions, special precautions can be taken to avoid dust and contamination entering the boundary between the microphone cartridge and the preamplifier. This is important in order to maintain low noise even at high temperatures and high relative humidity.


Class I TEDS as used in a DeltaTron TEDS microphone

What is TEDS microphone?

Fig 1 +2 Class I TEDS as used in a TEDS microphone set.



IEEE 1451.4 Standard


Most sound and vibration transducers (Brüel & Kjær as well as other manufacturers) conform with IEEE P1451.4V.0.9 which is actually a standard proposal and differs slightly from the final standard IEEE 1451V.1.0.


Transducer icon



Remapping to IEEE1451V.1.0 is available for all Brüel & Kjær transducers as part of after-sales support. Relevant Brüel & Kjær hardware (LAN-XI, PULSE, NEXUS, etc.) supports both the proposed and final version of the standard, and in many applications, the user will not notice a difference between the two standards.

The major difference between the proposed and final versions concerns the memory map. In the proposed version, all data is in an R/W area of the memory, while in V.1.0 some permanent data (manufacturer, etc.) has been moved to a write-once area of the memory. This leaves more space in the so-called user area of the memory.

Currently, only our 10 kHz Array Microphone Type 4957 and our 20 kHz Precision Array Microphone Type 4958 are supplied with TEDS according to the final revision – IEEE 1451.4V.1.0. This is because precision Array Microphone Type 4958 requires more space for the definition of the polynomial describing the complex transfer function.


TEDS Templates


The TEDS template defines the memory mapping of the TEDS chip and hence the “understanding” between transducer and front-end. A number of TEDS templates have been standardized by the IEEE and in addition to this, a number of non-standard vendor-specific templates exist.

The different TEDS templates are differentiated by different ID numbers. At the moment Brüel & Kjær uses the following templates for TEDS microphones and preamplifiers:



IEEE P1451.4 Beta
UTID. No. Name Remarks
Microphone with integrated preamplifier Used for Array Microphones Types 4935 and 4951. This template is with transfer function





IEEE P1451.4 V.0.9

Name Remarks
Microphone, integrated preamplifier Used for most TEDS microphones
1025 Microphone preamplifier Used for most TEDS microphone preamplifiers
Microphone, integrated preamplifier, extended sensitivity Used in special cases like low-sensitivity microphones or reference frequency, not 250 Hz


IEEE P1451.4 V.1.0
UTID. No.    Name Remarks
Microphone with an integrated preamplifier, V.1.0

This template is without transfer function.

Replaces UTID 769 and 116289

Microphone with an integrated preamplifier, transfer function, V.1.0

Same as UDID 127-0-0-0U but with transfer function. 

Replaces UTID 34013408


TEDS Microphone Specifications


For detailed specifications please refer to the product datasheets for the individual components. Unless otherwise stated all specification in this table are valid under the following conditions:

  • DeltaTron input types: 24 – 28 V compliance voltage
  • Classical input types: 120 V DC supply*
  • Dynamic range low limit: Noise floor dBA
  • Max. SPL dB: The 3% distortion limit in dB SPL RMS rounded to the nearest integer. The undistorted peak level will normally be 3 dB higher
  • Cartridge sensitivity: Nominal
Engineering services