Sound level measuring device SL400

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  5. SL400 sound level measuring device

Sound level measuring device SL400

Professional class 2 phonometer with data logger function and ISO calibration certificate

Whether for occupational safety, preventive health care, quality management or noise control inspections – owing to its ISO calibration ex works, the integrated live logging function and the analysis software supplied as standard, the universally usable sound level measuring device SL400 is ideally suited for a professional control and monitoring of workplace, industrial and environmental noise.

The SL400 meets the requirements for sound measuring devices of accuracy class 2 according to IEC 61672-1 and ANSI S1.4. This is why you are always perfectly equipped with this measuring device – whether for the documentation of machine and environmental noise, for measurements at the workplace or for expert assessments.

Depending on the requirements you can use the fast/slow time weighing feature of this professional measuring device to switch over from measuring once per second (slow) to once every 125 milliseconds (fast).

Large, backlit display with additional bargraph indicator

Moreover the SL400 allows for a separate weighing of type A and type C frequencies. While the A frequency corresponds to the sound pressure perception of the human ear, the C frequency focusses low-frequency components of a sound.

The four-digit measuring value display of the SL400 with an additional bargraph indicator can easily be read in every environment thanks to the LCD background illumination.

Multiple features – large scope of delivery

The SL400 is further equipped with a live logging function and enough data memory to record up to 32,700 measured values. For a software-supported analysis the measured data can simply be transferred to a PC via USB.

The supplied software allows, among other things, for live recording of the measured values with real-time indication, a graphic or tabular representation of the measured values including an option to print them out as X-Y diagrams or tables, as well as a zoom function and an export possibility in Excel format.

Mini tripod included in the SL400's scope of delivery

For logging or non-stop measurements the SL400 can further be fixed to the supplied mini tripod. Thanks to the integrated mains connection and supplied power adapter, it is also possible to switch over from battery- to mains-powered operation for time-consuming long-term measurements.

Moreover, an integrated 3.5 mm jack socket provides the SL400 with connections facilities for frequency analysers or x-y plotters.

An ISO calibration certificate is already included in the SL400's scope of delivery.

And not least, the SL400 impresses with its handy design, low weight and the arrangement of keys optimized for single-handed operation – the ideal basic equipment for sound level measurements in the fields of industry, work and environmental protection.

Typical applications of the sound level measuring device SL400:

  • Noise hazard measurements for occupational safety
  • Environmental protection applications for the determination of ambient noise
  • Determination of noise sectors for noise abatement measures in enterprises and public institutions
  • Examination and selection of hearing protection devices
  • Auditing the adherence to noise protection regulations
  • Control measurements in air-conditioning and heating engineering

A few practical benefits:

  • Accuracy class 2 according to IEC 61672
  • Frequency weighting as per characteristic curves A and C
  • Max, Min and Hold function
  • Storage space for up to 32,700 measured values
  • Reversible time weighting (fast / slow)
  • Data logger function
  • Alarm function
  • Large, easy-to-read display with additional bargraph indicator
  • LCD background illumination
  • Energy-saving automatic switch-off
  • 1/4-inch tripod thread
  • Analysis software
  • USB connection and 3.5 mm jack socket
  • ISO calibration certificate included
Safely protected behind an easy-to-open rubber cap, all interfaces are centrally accommodated in the robust measuring device.
Interfaces of the SL400
The SL400 is supplied as a complete set including an ISO calibration certificate, plug-on wind shield, mini tripod, power adapter, USB cable, analysis software, service tool, operating manual and transport case.
Scope of delivery of the SL400


SL400 Sound Level Meter show in Trotec online shop

SL400 Sound Level Meter

Sound level meter for noise measurement and quality control in, offices, factories, schools or on busy roads. Conforms to DIN EN 616721.

You save: 55.18 £

174.70 £ 119.52 £ incl. VAT
Show net price (VAT not included)



Technical data
General information
  Article number 3.510.005.020
Sound values
  Min. sound [dB(A)] 30
  Max. sound [dB(A)] 130
  Accuracy ±1,4 dB
  Resolution 0,1 dB
  Frequency range 31.5 Hz - 8 kHz
  Dynamic range 50 dB
  Partial measuring ranges 30...80 dB, 50...100 dB, 80...130 dB, 30...130 dB (auto)
  Response time 500 ms
Memory organisation
  Memory up to 32,700 Measured values
  LCD 4-digit
  Bar graph display
Device control
  Push buttons
Housing design
Power supply
  Internal (battery)
  Battery type 1 x 9V battery
Operating time
  > 30 h
Surrounding conditions
  Operation - min. temperature [°C] 0
  Operation - max. temperature [°C] 40
  Operation – min. relative humidity [% RH] 10
  Operation – max. relative humidity (non-condensing) [%] 90
  Length (packaging excluded) [mm] 255
  Width (packaging excluded) [mm] 65
  Height (packaging excluded) [mm] 45
Standard scope of delivery
Standard scope of delivery
  Measuring device
  Mini tripod
  Calibration certificate
  Analysis software
  USB cable
  Power adapter
  Transport case
  Operating manual
Ascertainable measured values and functions
Internal sensors
  Electret condenser microphone
Functions and features
  Display illumination
  Minimum value display
  Maximum value display
  Bargraph display
  Hold function
  Alarm function
  USB interface for data read-out and live logging
  Integrated dB(A) and dB(C) weighting filter
  Tripod mount

 standard equipment

 optionally available

 not available


Universal Tripod show in Trotec online shop

Universal Tripod

The tripod has a center brace with lock for safe standing and is already supplied with a robust 3-way head including quick release plate with a standard 1/4 "connection for optimal alignment of meter or camera.

You save: 33 %

27.54 £ 18.34 £ incl. VAT
Show net price (VAT not included)


Alternative products

SL400 with alternative products:

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SL 300 Sound Level Meter show in Trotec online shop

SL 300 Sound Level Meter

Sound level meter for noise measurements and quality controls in offices, factories, schools and on busy roads. The device conforms to the requirements of the DIN EN 616721 standard for sound level meters.

You save: 30 %

91.93 £ 64.33 £ incl. VAT
Show net price (VAT not included)


BS06 Sound Level Meter show in Trotec online shop

BS06 Sound Level Meter

With the BS06 the sound of various noise sources within a measuring range from 40 to 130 dB (a) can be detected reliably. In addition, minimum and maximum value to display.

You save: 48 %

32.13 £ 16.51 £ incl. VAT
Show net price (VAT not included)