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module based USB measurement Microphone 1/2" ATD4-S (Code: 6503)

Price: 499.00 EUR
Incl. 19 % TAX plus shipping
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With this USB measurement microphone you easily perform high performance measurements with your PC.Simply connect this microphone to a free USB port, no preamplifier, no external power no driver.

It was never easier to measure with your PC.


This is what you expect from a modern PC measurement system.

In many classical solutions, the problem occurs that the number of possible sources of error is quite high. An arbitrary combination of soundcard with microphone.  Is the preamp overloaded, the capsule, or the AD converter?. 
Anybody, who owns a collection at various USB soundcards knows the "fiddling" (check wiring, Windows Drivers, phantom power, level setting, the Windows Mixer adjustments  etc.).

These are things you should not consider today

In general, the new USB measurement microphones work with all measurement programs on the market. Only, the level calibration calibration feature is available in specially designed systems.

The advantages of such solutions are:

  • Setup is much easier, no phantom power, no drivers, etc.
  • Simply connect it to the USB port.
  • With appropriate software, these systems are calibrated directly.You can measure absolute sound level sound.
  • Calibrated measurement range selection via software
  • Cable lengths up to 60m
  • All parts of the signal chain are matched to each other.
  • Measuring ranges are instantly recognizable.

A USB measurment microphone contains the following components

  • pre-polarized condesor capsule 1/2" or 1/4"
  • impedance converter
  • pre-amplifier
  • digital controlable attanuator
  • AD-converter
  • USB interface
  • power supply converter

All parts are integrated into the body of the microphone. This makes the system very compact. Since there exist only the USB interface connection, cabling is very easy.

This system uses capsules with the thread 60UNS. You can connect almost any capsule from world leading brands. e.g. Bruel&Kjaer, GRAS, PCB and others.
With common mechanical adapters you can use 1" or 1/4" capsules.   The base package is equipped with a class 2 capsule (22mV/Pa).
The dynamic range is 20-111dB(A) 114dB peak

With our dynamic extension package you can increase the dynamic by 20dB to 130dB (133dB peak). With 1/4" capsules or attanuators you can reach significant higher level up to 170dB.

You can also connect class 1 capsules.


  • Gain is controlled by the PC allowing absolute level calibrations
  • Requires no external power. Simply connect it to USB
  • The operating system recognizes this USB microphone directly. There is no driver required. You can use this USB measurement microphone with Windows, MacOS or Linux. This feature will protect your investment, since you not depend on updated drivers.
  • We offer this system with different options (different capsules or dynamic extension)

This measurement microphone uses a real 1/2" capsule with 12,7mm diameter. Many simple measurement microphones use a cheap 1/4" caspsule (6mm) in a 1/2"-housing. The effective area of the diaphragma is 4 times smaller. This leads to significant higher noise.
The following picture demonstrates a 1/2" capsule in contrast to a 1/4"-electret capsule.

1/2" usb mic capsule vs. 1/4"

Common characteristics

  • Frequency range 10Hz-20kHz
  • Thread 60UNS
  • USB Audio class compliant
  • possible cable lengths: 5m with simple passive USB cables, 15m with active cables and 60m with special transceivers for regular CAT5 cables

The frequency response was measured electrically. The capsule was replaced by an capacitor. The curve does not contain the acoustical frequency response of the capsule.

Base package

The base package contains a 1/2" class 2 capsule with the following parameters

  • Sensitivity typ. 22mV/PA
  • Dynamic range 20-111dB(A) 114dB peak


With the option extended dynamic you can measure up to 130dB (133dB peak). You will get a second channel with 20dB offset. You can record or measure both channels simultaneously. This offers a dynamic range which where up to now not possible for USB measurement microphones.

If you connect a 50mV/Pa capsule you will get the following dynamic range

  • 17dB to 103dB in the base package
  • and 17dB to 123dB (126dB peak) with the extended dynamic option
  • The self noise of the amplifier and AD converter is 6.5dB(A)
  • You can reach significantly higher levels with 1/4" capsules.

The frequency response was measured electrically. The capsule was replaced by an capacitor. The curve does not contain the acoustical frequency response of the capsule.

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