A V Calibration Ltd is a UKAS
accredited calibration laboratory (no. 0653), for:
- Acoustic calibrators at 250 Hz or 1 kHz with a best measurement
capability of ± 0.12 dB
Single level / frequency £99.00; additional levels / frequencies
£26.00 per point.
- Pistonphones at 250 Hz with a best measurement capability of
± 0.12 dB. £99.00
- For newer sound level meters - periodic testing in accordance with Technical Guide NPL Acoustics 2004/1 for Class 1 and Class 2 meters originally manufactured in accordance with IEC 61672-1:2002 (BS EN 61672-1:2003)
For older meters, or any meter claiming IEC 60651 and/or IEC 60804 compliance - verification according to BS 7580:Part 1:1997 for Type 0, 1 and 2 meters.
Prices depend on make and model - contact us for details
- Octave and third-octave filters designed in accordance with either IEC 61260:1996 (Classes 0, 1 or 2) or IEC 225:1966 which are fitted to sound level meters. The following standard options are available:
Simplified tests of octave OR third-octave filters only (or if the sound level meter undergoes a UKAS-accredited calibration at the same time)
Simplified tests of octave AND third-octave filters only - (or if the sound level meter undergoes a UKAS-accredited calibration at the same time).
The simplified tests above cover inter-band levels for all bands within our frequency range, and filter shape for three filters per bandwidth, Prices from £135
Comprehensive tests of all third-octave filters
100Hz – 5 kHz for Building Acoustics Applications
OTHER OPTIONS CAN BE OFFERED – CONSULT
AV CALIBRATION WITH YOUR REQUIREMENTS
- Frequency response and linearity of Noise Recording Instrumentation
(e.g. DAT recorders, tape and cassette recorders, minidisc and
other digital and smart card recorders).
Recording instrumentation only, with or without a microphone included and recording instrumentation that includes a sound level meter that is either being verified separately or is used as a microphone and preamplifier only.
Prices start at £135
Prices exclude VAT and return carriage.
Suitable instruments from all manufacturers are considered including
01dB, Brüel & Kjær, Castle, CEL, Cirrus, Larson Davis,
Norsonic, Quest, Rion and Svantek.
Fully specified PC based sound level meter type systems can also be tested to both the Technical Guide NPL Acoustics 2004/1 for new systems designed in accordance with IEC 61672-1:2002 and to BS 7580:Part 1:1997 for systems designed in accordance with IEC 60651 and IEC 60804. If the system includes octave or third-octave filters, these can also be tested as required.
Target turnround time is 7 working days; however, for unusual instruments,
data may be required which could delay calibration time. If in doubt,
please contact AV Calibration Ltd with details of the equipment,
and we will endeavour to obtain all information prior to receipt
of instruments.
UKAS calibration needs the following requirements
fulfilled:-
Calibrators and Pistonphones
Housing or adapter to take industry standard 0.5" microphone
must be available. Calibration only in 0.5" configuration.
If calibrator is part of a sound level meter kit submitted for
BS 7580 verification, any pressure corrections required must be
known for this calibrator model, and the manufacturer must claim
compliance with BS EN 60942:1998 or BS 7189:1989 or equivalents.
Sound Level Meters.
For BS 7580 verifications, it must be supplied with a suitable sound calibrator that has been
UKAS calibrated within the last 12 months, and the certified level(s),
frequency and distortion must be known, otherwise the sound calibrator
will need to be calibrated before verifying the sound level meter. This is also strongly recommended for calibrations in accordance with the Technical Guide NPL Acoustics 2004/1, but is not mandatory.
Manufacturers must claim compliance to IEC 61672-1:2002 (BS EN 61672-1:2003), Class 1 or 2, for newer instruments. For all others, compliance with BS EN 60651:1994 or its equivalents, and also to BS EN 60804:1994 if either Leq or SEL is available, to Types 0, 1 or 2.
Microphone fitted to sound level meter must be free field industry
standard 0.5" or 0.25", and be capable of being calibrated
with an electrostatic actuator. Pressure to free-field corrections
for the microphone must be known. Case reflection data must be known
unless meter is calibrated with the microphone on an extension cable.
Full handbook information specified in the Standards must be available.
If fitted with a windshield, correction data for this must also
be known. All data to be supplied by the manufacturer or their representative
on their behalf.
Filters
Manufacturer must claim compliance with IEC 61260:1996 Classes 0, 1, or 2 or IEC 225:1966 and the filters must operate in conjunction with a sound level meter.
The sound level meter does not have to be calibrated at the same time as the filters, although this is recommended.
Noise Recording Instrumentation
Any recording device such as DAT, open reel, cassette, minidisc,
hard disk, CDR(W) or DVDR(W). If the recorder is stand-alone, its
frequency response from 31.5 Hz to 12.5 kHz is checked, and its
linearity at 1 kHz is tested over the top 65 dB of recording range.
The price for this is £135.
If the input of the recording device is connected to other equipment
such as a sound level meter, the test input is applied to include
the other equipment. The tests are the same as above, and the price
is also £135. Note that the other equipment does not have
to have any separate calibration certificate unless this is requested.
If the input of the recording device is connected to other equipment
that includes a microphone, and the microphone response is to be
included in the calibration, then the microphone must be a free-field
industry-standard 0.5" or 0.25", and be capable of being
calibrated with an electrostatic actuator. Pressure to free-field
corrections for the microphone must be known. If fitted with a windshield,
correction data for this must also be known. All data to be supplied
by the manufacturer or their representative on their behalf. Price
including the microphone is £195.
If the recording device is connected to a sound level meter, and
this meter is also fully UKAS verified at the same time, the price
for the recording device is only £135 including the microphone,
as this has already been calibrated as part of the sound level meter.
NOTE: An acoustic calibrator, UKAS calibrated within the previous
12 months, must be supplied with a recording system that includes
a microphone.
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