Model 33 Series Application Overview
Application Details and FAQ’s

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Model 33 Real Time Analyser
Technical data Sheet

Features:

The Pulsar MODEL 33 is a very powerful instrument that remains very easy to use. It is both a conventional integrating sound level meter type 1 fully meeting the requirements of the International standards IEC 60651, IEC 60804 and the new IEC 61672. It can also comply with the USA standards ANSI S1.4 and ANSI S1.43. It is also a real time spectrum analyser in one-third octave band and octave band, with type 1 filters according to IEC 61260 and EN 61260. It can also fulfil the requirements of the ANSI S1.11 standard.

MODEL 33 has just one single range, thus there is no need to make range changes, indeed, there is no conventional range control. It also measures all it’s functions simultaneously. These functions are the ones needed to calculate the basic noise metrics of most countries in the world and include: S, F and I functions, Leq, Percentile levels, Impulsivity indices, Peak levels, Sound Exposure levels, Short Leq functions, etc.

MODEL 33’s graphical display provides both graphical and numerical representation of the measured functions and it can be back-lit, allowing the instruments to be used in low-light conditions. A very large memory is provided to record all the measured data. The choice of stored functions is user configurable. There are both RS-232 and USB ports. The USB port allows fast download of the stored data while the RS-232 port allows you to configure communication ports via a modem (BTN or mobile) or wireless or connect direct to a printer

The preamplifier is removable and can be unplugged mounted remotely using one of the extension cables (CN-003, CN-010 or CN-030). This feature also allows the use of the two outdoor kits (WK1 or WK2) for both short term and long term outdoor measurements.

The ‘key-note’ feature of the model 33 is that is very user friendly indeed and it does not have a huge number of complex buttons to select from it’s huge number of options and yet it outperforms most competing units.

Applications:

The Model 33 stores the values of all the measured functions in its internal memory in a non-volatile memory of 64Megabyte. It can be retrieved for memory and either displayed directly on the screen of the model 33 or transferred to a PC using the cable and software supplied. The memory may be erased directly from the model 33 or from the pc. The model 33 can store many different measurement sets and this makes the measurement of several sites very simple. Each site is visited in turn and a short recording done. These can then be transferred to a pc and put into the database coded with the date and time of acquisition.

As the model 33 allows you to download the stored data simultaneously with the process of measurement and recording, it is possible to see the early part of any long measurement without disturbing the current data acquisition. This, together with the possibility of configuring the free memory space as a circular memory, makes model 33 the ideal instrument for permanent acoustic monitoring. To this end, two full outdoor measurement kits are available, the WK1, ‘short term’ kit or the WK2 ‘long term’ variant. Data sheets and applications notes are available for this outdoor application and more data is on the web site www.pulsarinstruments.com .

The two outdoor kits WK1 and WK2, allow the model 33 to be used in almost any type of weather to make acoustic measurements that would have been considered ‘impossible’ just a few years go. Used in conjunction with the standard software or one of the many proprietary suites such as Acoustic Editor or even a standard database package, model 33 provides almost any acoustic data required.

Memory capacity

The table gives the memory storage capacity for various modes.

SOUND LEVEL METER mode
Functions 1 s (82 functions each sec.) 4 days 16 hours
Functions 125 ms( 15 functions each 125ms) 3 days 5 hours
LT + LIT and Ln each min

4 years 9 months

F1 each second

 8 months 14 days

 

SPECTRUM ANALYSER mode
1/1 octave mode each min 8 months 17 days
1/3 octave mode each min 2 years 3 months

Note:- There are many intermediate times depending on what is being stored.

 

Model 33 - Technical Specifications

Model 33 fully complies with the following standards:· EN 60651:94 (A1:94) (A2 :01) type 1, EN 60804:00 type 1, EN 61260:95 (A1:01) type 1· IEC 60651:01 type 1, IEC 60804:00 type1, IEC 61260:95 (A1:01) type1· ANSI S1.4:83 (A1 :85) type 1, ANSI S1.43:97 type 1, ANSI S1.11:86 ·

It complies with non-acoustic regulations 73/23/CEE and CEM 89/336/CEE low-tension regulations, the latter amended by 93/68/CEE.

The model 33-2 has almost identical specification data to model 33, but is a Type 2 or Class 2 instrument, although the filters comply with Class 1 as do the electronics - it is only the microphone system that is different.

 
MEASUREMENT RANGE : 28 to 137 dB(A), 31 to 137 dB(C) 33 to 137 dB(Z): L peak limits: 70 to 160 dB
ELECTRICAL NOISE : with MK224, A = 22, Z = 27 dB
FREQUENCY Weighting : Standard Weightings A, C and Z
AC OUTPUT Weighting : 16Hz to 16kHz 8 v approx at 135dB
MEMORY : 64 Mbytes non-volatile
MICROPHONE : MK224 pre-polarised capsule 45 mV/pa
PRE-AMPLIFIER : Detachable
EXPONENTIAL TIME WEIGHTINGS : LF, LS, LI to class 1 tolerances
RESOLUTION : 0,1dB
OCTAVE FILTERS : Comply with Type 1 of IEC 61260:95/ A1:01
Nominal octave bands mid-freq. : 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000 Hz
THIRD OCTAVE FILTERS : Comply with Type 1 of IEC 61260:95/ A1:01
Nominal 1:3 octave bands : 28 bands from 20Hz to 10kHz
HUMIDITY RANGE : Operation :
30 to 90 % Max Error 0,5dB
Storage without batteries: < 93 %
EFFECTS OF MAGNETIC FIELDS : 80 A/m magnetic field at 50 Hz, reads less than 25 dB(A)
INFLUENCE OF TEMPERATURE : Operation range: -10 to +50ºC Max error (-10 to +50ºC): 0.5 dB
Storage without batteries: -20 to +60ºC
EFFECTS OF VIBRATIONS : Between 20 and 1000 Hz and 1 m/s2: <75 dB(A)
BATTERY : 2 batteries 1.5 V size AA:
Battery life with continuous use : Sound Level Meter mode : 15 h
  : Spectrum Analyzer mode 1/1: 13 h
  : Spectrum Analyzer mode 1/3: 11.5 h
DIMENSIONS : Dimensions:341 x 82 x 19 mm
WEIGHT : With battery 550 g. Without battery 500 g
ACCESSORIES SUPPLIED : Comms Cable, Software on CD

Options and additional accessories

Measured Functions.

Sound level meter mode functions

Spectrum Analyser mode

Reverberation time module for Model 33

The reverberation time (RT) module of Model 33 adds two new measurement modes: 1:1 and 1:3 band Rt measurement mode (1:1) (63 Hz to 4 kHz) & 1:3 (50 Hz to 5 kHz). Each of these modes allows the simultaneous measurement of the reverberation time T20 and T30 for the corresponding bands by the interrupted noise method. There is automatic determination of the decay curve and its slope, based on a least square approximation. The decay curves are calculated from the averaging time between 10 ms and 40 ms depending on the frequency band.

The module stores the following results in memory: T20, T30, and decay curves, for all octave and 1/3rd octave bands.

The method meets

Extended Frequency Analysis package for Model 33

The Extended Frequency Module for 1:3 Octave Band Analysis of Model 33 includes two new spectrum analyser measurement modes, in the 1:3 octave bands from 6,3 Hz to 2,5 kHz and in the 1:3 octave bands from 800 Hz to 20 kHz. Model 33 with its single large dynamic range, performs real time analysis for each of these modes, measuring Leq with a programmable integrating time from 1 second until 99 hours. Simultaneously, Model 33 measures, in real time, “Short Leq” elements with a 1/8sec (125 ms) integration period for the corresponding bands.

The major applications are the frequency analysis of noise produced by machinery (low frequency), the evaluation of tonal components and the detection and identification of noise sources, especially in industry.

Outdoor kits WK1 and WK2Outdoor Kits WK1 & WK2 for model 33

The Pulsar 30, 33 & 60 series all have outdoor kits, typically used for environmental monitoring. There are two basic models and both have the same waterproof case that has a large internal battery giving about 5 days (150hr) operation. The kits essentially vary only in their microphone and they both have two waterproof connectors to connect to a microphone and an optional computer. Included are software, cables and space for all the accessories.

WK1 This is the simplest version. The ‘microphone unit’ is simply a waterproof mount and cable which takes the pre-amplifier and microphone capsule normally fitted to the instrument and provides wind and rain protection. It can be fitted onto a standard camera tripod (not included) and is suitable for overnight measurements. We do NOT recommend it for longer-term use. The microphone assembly used is the M100

WK2 This uses a full outdoor microphone, which is a complete system and does not use the instrument’s own microphone capsule and pre-amplifier. It is similar to the long-term airport monitor microphone and models have been outside for up to 5 years without problems. It comes complete with its own built-in tripod and for transport fits into a shipping tube. These microphones (Type M120) are also available for sale to competitors who use them for their outdoor kits and are loosely based on a Cirrus Research MK: 437

Both kits contain the following:-

Model 33, the outdoor kits and all software modules are produced totally within the European Union

Pulsar Instruments Plc. - Tel: +44 1723 518011 - Fax: +44 1723 518043 Go to the top of this page - Design Artisan du virtuel - V3.0.1-2007-07-20