Product news

Product innovation - MV 240 USB

With the MV 240 USB, Microtech Gefell is launching a measurement microphone amplifier in a class of its own!

The MV 240 USB is a measurement microphone amplifier with an integrated 2x 32-bit gain-ranging AD converter for externally polarized or pre-polarized measurement microphone capsules. The digital 32-bit output signal with up to 192 kHz sampling frequency corresponds to calibrated sound pressure values and reproduces more than the entire dynamic range of a measurement microphone capsule. The MV 240 USB is automatically recognized under Windows, MacOS, iOS, Android and Linux. It is powered directly from the USB interface.

Thanks to its versatility and impulses from the field, the MV 240's range of applications has been greatly expanded.

In terms of design and quality, it differs fundamentally from all standard analog-digital solutions on the market and is constantly being developed further.

Current development topics include, for example, synchronization via the time stamp of a GPS sensor, e.g. for pass-by solutions or the expansion of the range of applications through combination with mobile end devices.

The MV 240 digital thus opens up a multitude of new applications that could not be realized with previous analogue or conventional analogue-digital solutions for cost or functional reasons.

Accuracy and simplified operation now allow existing applications to be optimized and new, efficient fields of application to be created (e.g. industry, environment, R&D, occupational health and safety through to the education and training sector).

Current examples are the use in weatherproof microphone units WME 980 CN for environmentally relevant noise measurements or in the study and training sector as well as R&D.

The combination of the WME 980 series with the MV 240 digital makes it possible to expand both the functionality and the efficiency of permanent outdoor noise monitoring as well as stationary or mobile environmental noise monitoring.

In addition to noise measurements, key areas of application include pass-by test benches for outdoor noise measurements in the automotive sector, which are important for official vehicle certification, vehicle development and quality assurance in production.

Growing interest was also evident in the field of study and training as well as in the R&D sector, e.g. at the Jena Acoustics Day 2024 at the Ernst Abbe University of Applied Sciences Jena.

Access to high-quality measuring equipment and methods is essential for a well-founded and broadly based university education for future engineers, masters, bachelors, technicians and R&D specialists.

With the digital measuring microphone, every student, researcher and developer has a cost-effective high-end, research- and industry-compatible measuring device at their disposal, which can be connected to standard computer technology with Windows®- or Linux®-based operating systems, such as a digital sound interface, without any further technical requirements.

It is also possible to program, measure and evaluate measurements in systems such as Phyton®, C++®, MATLAB® or Labview® while integrating the digital measuring microphone.

This provides a basis for digital laboratory measurement both in the home and in the laboratory.

MV 240 digital - outstanding features

The outstanding features include, for example

- Digital measuring microphone with 32-bit data transmission
- Digital transmission of fixed calibrated sound pressure values
- Full dynamics of a newly developed low noise 1/2" capsule
- With ¼" capsule use - maximum sound pressure level of 160 dB
- Max. dynamic range of the 32 bit range is 186 dB
- User-independent of special company software, can be used with common measurement software
- Compatible with all common operating systems

Equipped with a new, specially developed high-end low noise capsule and new, integrated electronics matched to the capsules (including an integrated AD converter), the MV 240 considerably expands the range of potential users.

Existing disadvantages of previous AD solutions in terms of complex operation and time-consuming installation, possible sources of error due to complicated coordination of several electronic components and the resulting time and personnel costs have been overcome.

Advantages of the innovative MV 240 digital:

- Only one measuring range for the entire dynamic range, i.e. no range switching necessary,
- Direct digital sound pressure conversion (with exact sensor-ADU adaptation to exclude common sources of error),
- Sampling frequency up to 192kHz is supported,
- no measurable or audible USB artifacts, USB class-compatible (USB 2/3),
- no additional device driver required,
- internally generated capsule polarization voltage 200V,
- minimal self-noise due to optimum adaptation of the measurement microphone capsule to the AD converter,

The new MV 240 digital thus offers the possibility of solving existing problems with previous AD solutions with just one device. It replaces two analog measurement microphones, two analog front-end channels and part of the digital signal processing, thus saving costs. In addition, no separate power supply unit is required, as is usually the case with analog measurement microphones if their full dynamic range is to be used.

Another significant advantage is a test generator integrated into the microphone, which enables both the complete transmission and evaluation of a signal.