Noise meters
Here you will find industrial standard noise meters. With these portable noise meters you can carry out measurements quickly to gain control of a situation or to set the devices to take timed measurements. The noise meters is important for all industries, especially by using it as a mobile device which is able to assess office stress levels or street noise levels. Often problems arise from noisy neighbours or if bars and restaurants are in residential areas and produce noise levels after 10pm in excess of what local laws permit. We, of course, can assess which noise meter you require in relation to the issue you have and the relating laws. We also have microphone extension cords (except for the PCE-999), tripods, calibrators and calibration certificates for all models. If you don't find the noise meters you are looking for, please contact us and we will help you find the best solution to suit your needs by calling our offices on: +44(0)2380 987030 and our technical staff will advise you regarding our measuring instruments.

Here you can see megohmmeters from these companies:

- MicW i436 Noise Meters 
  (Mini Microphone for iPhone/iPad and other devices, max. 130 dB sound pressure)

- PCE-EM 886 Noise Meters
  (Noise meters with sound, light, temperature, humidity sensors and multimeter function)

- MicW i456 Noise Meters 
  (for iPhone/iPad and other devices, for high-quality recordings under difficult conditions)

- PCE-EM 882 Noise meters
  (Noise meters includes sound, light, temperature and humidity sensors)

- MicW iBoundary Noise Meters 
  (Interfacial microphone for mobile devices, ideal for meetings, seminars, interview, full 360°)

- PCE-999 Noise meters  
  (Standard industrial noise meters, accurate to ±1.5dB)

- PCE-318 Noise meters
  (Measures from 26dB, accurate to ±1.5dB, analogue output)

- MicW i266 Noise Meters 
  (with augmented membrane face for recordings of quiet sounds up to 130 dB for iPhone/iPad)

- PCE-322A Noise meters
  (Similar to the PCE-999 but with internal memory)

- SU 130 LEQ-Noise meters
  (Noise Meter for noise measurement in industry, small trade, service provider and private household)

- MicW iShotgun Noise Meters 
  (Mini clip on microphone for mobile devices and cameras, simultaneously access of micro and headset)

- CEL-244 series Noise meters 
  (Noise meters with many functions (LAF, Leq, etc.), USB cable and software, last digital technology, robust)  

- CEL-620 series Noise meters 
  (Noise meters with internal data memory, hi-res colour screen, automatic calibration)

- CEL-350 series Noise meters
  (Noise meters with internal memory / interface cable and multiple functions complete software package)

- SLT series Noise meters
  (Noise meters with interface cable and multiple functions complete software package)

- Noise meters for stationary use
  (Noise meters for monitoring equipment and standard signlas production)

General information for Noise meters

We have compiled an informative list of the important points in taking measurements with Noise meters:

 Terms / Directives                    Operation / Use                 Noise in the workplace

A-weighting
The sensitivity of human hearing depends on the frequency. Low and high tones are perceived with less precision than the tones in between. In the measurement of noise or sound this is taken into account and the frequencies contained within the sound are valued differently with respect to the A-weighting curve.
Sound readings are taken in decibels (dB) (A). The A-weighting curve is used primarily in the environmental and industrial sectors; the B and C curves are used for louder sounds and are less frequently used. The noise meters most commonly used for these measurements are the PCE-999 and the PCE-322A.


Decibel
The decibel consists of one tenth of a bel (B). A bel is defined as a logarithm of the bahaviour of two readings of the same type. It is used for the measurement of sound levels although the actual sound output is determined in relation to a specified reference intensity
Abbreviation: dB.
Calculation: LP = 10 * log (P / P0) in dB
where
P = sound output
P₀ = specified reference intensity (typically, 10 - 12 Watt)


Equivalent continuous noise level (Leq)
The equivalent continuous noise level is an energy mean of the noise level averaged over the measurement period (T) and often regarded as an average level.
Its also part of a sound level over a duration of time (X) that describes a noise with duration D has the same value as a noise that has half the duration (D / 2), but for this it has a sound level of 3dB ( = 10 * log 2) higher (to take this measurement you require the PCE-353 noise meter.)
The Leq is calculated in this way:

Leq = q/log2 * log(1/T ( 10(log2/q)* Li * ti)

Li = unique event level
T = period of measurement (for example: 16 hours),
ti = duration of the unique event, the maximum level can't be increased by more than 10dB,
q = equivalence parameter or division by two. Provides the change of level, that is equivalent to a constant level to duplicate or divide by two the effective time. Normally at international level  q=3, corresponding to the energy equivalence.

Regular measurment of chance occurances with constant intervals (example, 1/10 or 1/100 s) the value can be occur analogically to the number of the chance value
Leq = q/log2 * log(1/N ( 10 (log 2/q)* Li)
where the symbols are exactly the same as in the previous equation.


Infrasound
Frequencies below 16 Hz (Hz = 1/s)


Level day-evening-night (Lden)
According to the proposed directives of the EU relating to "Measurement and treatment of environmental noise" for the index of produced noise: day/evening/night level. The evening hours are 19:00 to 23:00 o'clock, with a supplement of 5dB and at night from 23:00 to 7:00 o'clock, with a supplement of 10dB (for example, the noise meter serie-1900.)


Level day-night (Ldn)
Day-night average sound level is the average noise level over a 24 hour period. With it, different measurements can be taken at different times of the day.


Maximum level
Maximum value is a sound event also denoted as a peak sound. In sound bursts, it's easier to determine various peak points and establish a maximum average or extract the L1 percentile level.

Measurement level
The measured sound level calculated over a period of time in a measurement of noise which has certain noise level specifications be means of noise level corrections.  For these measurements it is advised to use noise meters with the Frequency analysis function.
Abbreviatons: RL (rating level), during daytime (LT); during nightime (LN) (in dB).
In American English  it is also referred to as Ldn frequency.  

Peak level
Maximum sound level reached in a sound burst, also called maximum level. Because of possible loud oscillations, it provides a better description of the average maximum level or the L1 percentile level.

Solid bodies
Sound that spreads and impacts with solid bodies such as ceilings and walls of buildings. This has high importance in the noise produced by the construction sector.

Sound pressure level
The magnitude of sound pressure of a source (px) relative to a level reference sound pressure (p0). L = 20 log (px/p0). It is expressed in decibels (dB), almost always compared with frequency value, for example, dB (A).

Sound energy
The physical energy of a source of radiated sound.

Sound event level (SEL)
(also LAE). Parameter largely related to the LAeq. With it isolated events can be determined (for example, air transit or passing traffic). The sound energy is normalized to a temporary duration of 1 second.

Sound TA
Technical indication for the protection against noise
General prescription administered by the Federal emissions law 26.8.98. In ruido TA value directives are determined that should be followed precisely to protect the public from the harmful effects of noise. Ruido TA has advanced in force to be used for installations with authorisation and for those that don't require authorisation.

Temporary value
To be able to follow oscillating sound levels in display instruments that were previously constant, different temporary constants are introduced: Fast, Slow, Impulse. Normally the temporary value that you should employ is prescribed.
Sound bursts are considered to have a more imbalanced frequency than sounds events of longer durations. For this reason, it has to be taken into account in the reading, the duration of the bursts by way of a temporary value. (source: UBA).

If you wish to view or print the selection of noise meters from our catalogue, click the PDF symbol.

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If you have any questions, call our offices on: +44 (0)2380 987030.

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