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Sound Level Meter Type 1 – Statistical Noise Measurements

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Tango SLM Class 1 by SINUS Messtechnik GmbH

Statistical Noise Measurements

Compact Integrating Sound Level Meter

The Tango sound level meter is a compact, PTB-approved, basic Class 1 sound level meter for occupational and environmental safety applications. Tango is very easy to operate despite its many functions. It has an intelligent software design and a measuring range of 110dB which does not require range switching.

The 1/2″ polarized microphone is removable and can be calibrated with a standard acoustic calibrator. The backlit, high-contrast display indicates the measured values and offers good readability in sunshine or darkness. The keypad has a clear arrangement and is easy to navigated. The meter has ultra-low current consumption with two batteries (1.2 … 1.5V, AA type) providing operating times of up to 120h and storage over 10 years (with Lithium batteries).

The Tango sound level meter simultaneously measures levels with the frequency weightings A and C and also time weightings Fast (125ms) and Slow (1s). Measured levels include instantaneous sound levels LAF and LAS, as well as maximum levels LAFmax, LASmax and LCpeak. The Tango meter also measures LAeq and LAE  integrated over a selected period. Additionally exceedance periods for three user-selectable LCpeak thresholds may be determined.

Tango meet all requirements for a Class 1 sound level meter in the following fields of application:

  • Traffic and industrial noise measurements
  • Monitoring of noise created by neighbours and recreational activities
  • Occupational noise measurements

The Tango meter retains the calibration values after t is turned off.
Its low cost, easy operation and small dimensions make Tango the ideal tool for all users who require an IEC 61672 Class 1 instrument, but do not need to perform frequency analyses or sound signal recordings.

Operating Tango using the USB interface

The Tango sound level meter also offers operation via a laptop or desktop computer using the USB interface. In this operation mode the PC will display the measured values and supply the device with power via the interface. For power supply from 230V mains power outlets a USB wall power supply is included in SLM kit.
The Tango-Utilities software is also included for operation and configuration via PC and data transfer. A separate window is provided on the computer screen for easy parameter set-up and transfer of stored values.

The interface also enables the user to integrate Tango into a PC-based measurement system. The commands required for this operation are included in a command list. The command structure of the interface is designed to allow operation of the instrument in an ASCII terminal.

High-quality measurement equipment made in Germany

The Tango sound level meter and the enclosed Class 1 microphone are exclusively manufactured in Germany.


IEC 61672: Class 1 sound level meter

IEC 60651: Class 1 sound level meter

IEC 60804: Class 1 sound level meter


Germany – PTB type approval 21.21 / 12.04


Tango-Utilities (included with each meter)
The Tango-Utilities software enables measured data to be retrieved and stored on a PC, as well as exporting measurement data stored in an Office standard format. The software also enables the Tango to be configures for various uses (eg measurement values, storage durations, percentiles) which can be stored on the computer and loaded onto the meter for particular uses and applications and transfered it to the instrument .

Technical Specifications

Class 1 or Class 2 according to IEC 60651 / 60804 / 61672

Type Approval
PTB type approval 21.21 / 12.04

Measuring range
30 … 140dB (A)

Measurement values

  • Sound pressure level LAF, LAS
  • Maximum sound level LAFmax, LASmax
  • Continuous sound level LAeq
  • Peak level LCpeak
  • Sound dose LAE
  • 3x peak level exceedance duration LCpeak_exceedance
  • Time / measurement time / exceedance duration
  • Optional: 3x percentiles LAFn

Frequency weightings
A + Cpeak

Time weightings
Fast, Slow

Measuring range
30 to 140dB (L Aeq)
60 to 143dB (L Cpeak)



Backlit LCD:

  • Measured value with 3.5 digits
  • Bar graph in 5-dB steps
  • < Undercut, > overload
  • Measurement time (hh:mm:ss)
  • Battery state of charge
  • Storage state

1/2″ measuring microphone, permanently polarized, removable

Automatically to 94dB (104/114dB selectable)

Storage cycles
Individually and freely selectable for all measurement values from 62.5ms … 60min

Storage capacity
Up to 194 days depending on selected storage cycle


2 x AA type (1.2 … 1.5V), all battery models may be used

Operating time per battery set
> 120h

Battery storage period
10 years (Lithium battery)

190mm x 70mm x 32mm

250g (incl. batteries)

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