Quantifier 91 & 92 data logging sound meter

This data logging sound meter is a no-nonsense, practical solution for measuring vehicle noise and exhaust noise.

  • Easy to navigate keypad
  • Broadband measurements with Time History
  • Data-logging with outstanding Analyser software package provided as standard
  • Option to print data directly from the instrument
  • Complies with IEC 61672, IEC 60651 & IEC 60804
  • Calibration certificate included as standard


The Model 91 (Class 1) data logging sound meters are the ideal instruments to measure vehicle noise. On these models, the pre-amplifier can be removed from the instrument, connected via a cable and located next to the exhaust in the correct position. This allows the sound level meter to be read from the driver’s seat so the correct engine speed can be set for measuring vehicle exhaust noise.

Both sound meters can also be used for the risk assessment of noise levels providing time history and the measurement of all required parameters needed to comply with the Noise at Work Regulations and EU Directive 2003/10/EC.

Each data logging sound meter has been designed to be easy to use whilst providing the user with the fundamental parameters required to comply with current legislation such as Leq, LEPd and LCPeak.

All sound meters in the Quantifier range are data logging making it easy to transform your noise measurements into informative reports. Our outstanding Pulsar Analyser reporting software package is provided as standard, making the transformation of measurements into informative reports a simple task.

Simply switch on the instrument, calibrate and start measuring noise

  • Easy to navigate keypad
  • Broadband measurements with Time History
  • Removable pre-amplifier
  • Data-logging with outstanding Analyser software package provided as standard
  • Option to print data directly from the instrument
  • Automatic back-light
  • Complies with IEC 61672, IEC 60651 & IEC 60804
  • Calibration certificate included as standard

Class 1 Model 91, Model 93 & Model 95

Class 2 Model 92, Model 94 & Model 96

Applicable Standards

IEC61672-1:2002 Class 1 or 2 Group X

IEC 60651:2001 Type 1 or Type 2

IEC 60804:2000 Type 1 or Type 2

ANSI S1.4 with NK:70 Random Incidence Adaptor

1:1 & 1:3 Octave Filters to IEC 61260 Class 1 (where fitted)

Microphone (Typically)

Class 1 MK:224 pre-polarised Free-field ½


Class 2 MK:216 pre-polarised Free-field ½


Microphone Preamplifier

Class 1 MV:200D Removable Preamplifier

Class 2 MV:200D Integral Preamplifier

Measurement Range

Broadband 21dB(A) to 140dB(A) Class 1

25dB(A) to 140dB(A) Class 2

143dB(C) Peak (70dB to 140dB Range)

1:1 Octaves 19dB(Z) to 140dB(Z)

1:3 Octaves 14dB(Z) to 140dB(Z)

Noise Floor (Typical)

Broadband 18dB(A) Class 1, 20dB(A) Class 2

1:1 Octaves 12dB(Z) @ 1kHz 1:1 Octave Band

1:3 Octaves 7dB(Z) @ 1kHz 1:3 Octave Band

Frequency Weightings

Channel 1 ‘A’, ‘C’ or ‘Z’

Channel 2 ‘C’ for Peak

Z weighting is a flat frequency response. When either 1:1 or 1:3

Octave Band Filters are selected the ‘Z’ weighting is used.

Time Weightings

‘F’ (Fast), ‘S’ (Slow) & ‘I’ (Impulse) to IEC 61672-1:2002 Class 1 or 2



Broadband Mode

LAeq, LCeq or LZeq, LCpeak

LAF, LAS, LAI, LCF, LCS, LCI, LZF, LZS or LZI (not stored)

LAFmax, LASmax, LAImax, LCFmax, LCSmax, LCImax, LZFmax, LZSmax or LZImax

LAFmin, LASmin, LAImin, LCFmin, LCSmin, LCImin, LZFmin, LZSmin, LZImin

LAE, LCE or LZE, LAleq, LCleq or LZleq, LAFTeq

L0.1 to L99.9 (five simultaneous user-selected values available)

Date and time, 1 second Short Leq Noise Profile (LAeq, LCeq or LZeq)

Filter Mode

1:1 or 1:3 filter selected

Filtered LZS, LZF or LZI (not stored)

Filtered LZeq (stored), LAeq, LCeq or LZeq (stored)

Date and time

Frequency Bands (Nominal Frequencies)

1:1 Octave Band 31Hz to 16kHz

1:3 Octave Band 25Hz to 16KHz

20Hz & 20kHz 1:3 Octave band with MO:800/6 Factory Option


16Mbit memory allowing up to:

1300 broadband measurements

770 1:1 octave measurements

330 1:3 octave measurements

For example, broadband mode allows 12 days of 15 minute measurements to be stored.

Calibration records are automatically stored in the instrument memory.

Noise Profile (LAeq, LCeq or LZeq).

Short Leq (LAeq, LCeq or LZeq)

Up to 12 days at 1 second acquisition with 2 second factory set option

Automatic Measurements

The unit can be set to record and store data over fixed times of:

1 minute 5 minutes

10 minutes 15 minutes

30 minutes 1 hour

8 hours 12 hours


Graphical LCD with Quasi-Analogue Display

Selected measurement parameter with level Warnings for Overload, Under Range

Battery Level & External Power Indicators

Time & Frequency Weighting

Elapsed measurement time

Real time short Leq (broadband mode)

Graphical 1:1 and 1:3 Octave Band (recall mode only)

Recalled stored measurements

Measurement Range & Instrument settings


340mm x 75mm x 25mm


450 gms


2 x AA (LR6)

Battery Life

Broadband Mode typically >24 hours


Temperature Operating –10oC to +50oC

Storage –20oC to + 60oC

Humidity Up to 95% RH Non Condensing

External Connections

USB Type B Data Out

Multipin I/O for optional connections


Unweighted AC Output via Multipin I/O Connector

PU:90C recommended (Specify UK, EU or US plug type)

Electromagnetic Performance

IEC 61672-1:2002

IEC 61672-2:2003

Except where modified by EN 61000-6-1:2007

Output Cables

Standard: ZL:100 USB to USB

Optional: ZL812 AC Output Cable to Phono Cable

ZL:813 RS232 Output Cable


Pulsar Analyser download, analysis & reporting software

Compatible with Windows 9x / Me / 2000 / NT / XP and Vista

Ordering Codes

Sound Level Meter Measurement Kit

Model 91 Model 91K

Model 92 Model 92K

Model 93 Model 93K

Model 94 Model 94K

Model 95 Model 95K

Model 96 Model 96K

Measurement Kits

Instruments can be supplied as a complete measurement kit to ensure you have all of the accessories necessary to perform your noise survey. The Quantifier noise measurement kit contains: Sound Level Meter, Acoustic Calibrator, Windshield, Hard Attache Case, Wrist Strap, Analyser Software, Download Cable, Batteries, Operating Manuals, Calibration Certificates & Extended Warranty Record.



  • Ideal for vehicle noise and exhaust noise measurements as well as general risk assessment of noise levels.

Quantifier datasheet



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