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Acoustical Standards - Calibration Services
Ordering Calibrations Services
The Acoustical Standards Program maintains and improves
Canada's primary acoustical standards implemented with the reciprocity
method, and standards on ultrasound. It disseminates acoustical standards
that are used by government, industry, trade, and in the health science
field.
The Program also develops techniques to improve the reliability and ease
of traceability from standards used in the field to the primary national
standards. It provides technical support to the Calibration Laboratory
Assessment Service (CLAS) involving acoustical calibrations and is active
in national and international standards activities pertaining to acoustics.
 Uncertainties
Calibration
Services
Measurement
Services
Consultation
Services
Facilities
Fees
for Service
Arrangements can be made for services not described
here.
Contact: Dr. George Wong
Tel. (613) 993-6159
The uncertainties quoted in the descriptions below are expanded uncertainties
representing a confidence level of approximately 95%. They were obtained
by multiplying the standard uncertainty (one standard deviation) by a
coverage factor of k = 2.
- Primary pressure reciprocity calibration system for absolute calibration
of laboratory standard microphones over the frequency range from 50
Hz to
20 000 Hz
- Phase-match of a pair of condenser microphones from 10 to 10 000
Hz
- Sound level meters, including acoustic sensitivity and electrical
performance, and sound level calibrators according to American National
Standards Institute (ANSI) and International Electrotechnical Commission
(IEC) standards
- Primary interferometric system for sinusoidal calibration of accelerometers
from 20 Hz to 5000 Hz
- Shock calibration of accelerometers by comparison within the range
from 200 m/s2 to 100 000 m/s 2
- Ultrasound power and transducer beam profile
- On special request, calibration of acoustical instruments such as
integrating averaging sound level meters, noise dosimeters, and filter
sets
- Precision acoustic system for measurement of the variation of ratio
of specific heats of gases and gas mixtures
- Frequency analysis of signals
- Narrow-band, octave- and one-third-octave-band analysis, and
- Most types of acoustical measurement over the frequency range 16 Hz
to 20 kHz and, in certain cases, from 0.5 Hz to 100 kHz.
- Pertaining to national and international acoustical standards, legislation
and regulations
- Acoustical calibrations and measurements
- Noise and vibration problems including accelerometer calibration
- Acoustical measurement and calibration system design
- Precision mechanical, electrical, and electro-acoustical designs and
system implementation
- Ultrasound power measurements and calibrations and transducer design
Specialized space available to the Program includes an anechoic chamber
with a low frequency cut-off at about 80 Hz, a relatively large measurement
space (15.2 m x 8.8 m x 6.7 m) for indoor semi-free-field measurements,
and complementary acoustical instrumentation.
A primary pressure reciprocity calibration system with environmental
control is available. The Program also has systems for sound level meter
and acoustical instrument calibration, an ultrasound power and beam profile
measurement facility, and a facility for comparison and absolute calibration
of accelerometers.
Ordering Calibrations
Services NEW procedures effective March 23, 2006.
A33-01-00-00
Custom Acoustical Measurement and Services
Fee on request. |
Contact
Dr. George Wong (Tel. 613-993-6159; Fax. 613-990-8765). |
A33-01-00-01
Handling Fee
$220 |
A charge is levied for any instrument
found to be unsuitable for calibration. This fee covers opening, inspection
and return and is based on the work done prior to discovery of the
fault. |
Microphones
Precision
Sound Level Meters
Sound
Level Calibrators
Absolute
Accelerometer Calibration
Medical
Ultrasound Measurement & Calibration
| Microphones |
A33-01-01-01
$2435 |
Calibration
of the frequency response of one condenser measurement microphone
by the absolute pressure reciprocity method. The open-circuit sensitivity
level has a best uncertainty of 0.04 dB, depending on the frequency
and the microphone type.
The uncertainty is 0.06 dB from 50 Hz to 8 000 Hz for laboratory standard
'one-inch' (LS1P) microphones, and 0.18 dB from 50 Hz to approximately
20 000 Hz for laboratory standard 'half-inch' (LS2P) microphones.
For most microphones, the appropriate free-field correction curve
for 0° incidence will also be supplied.
Please refer to the technical contact for calibration of microphones
under IEC reference environmental conditions. |
A33-01-01-01A
$900 |
Frequency response and open-circuit
sensitivity of one condenser microphone by comparison with a standard
NRC microphone. The best uncertainty is 0.06 dB at 250 Hz for LS1P
microphones.
The undertainty is 0.2 dB from 50 Hz to 8 000 Hz for LS1P microphones,
and 0.29 dB from 50 Hz to 16 000 Hz for LS2P microphones. |
| Precision Phase Match of Microphones (A33-01-01-02 to A33-01-01-04) |
A33-01-01-02
Pair of Half-Inch
Condenser Microphones
Fee on request |
This
service provides precision phase match of a pair of half-inch laboratory
standard and working standard condenser microphones, with an uncertainty
of less than 0.1 degree over a frequency range from 10 Hz to 1 kHz
and with an uncertainty of less than 0.5 degree for frequencies to
10 kHz. |
A33-01-01-03
Other Microphone Sizes
Fee on request |
This is the same service as A33-01-01-02
above, but for other microphone sizes. Refer to the technical contact
for information about frequency range, measurement uncertainty, and
fees |
A33-01-01-04
Microphones with Protection Grids
Fee
on request |
This
is the same service as A33-01-01-02 above, but for microphones with
protection grids that cannot be removed. Refer to the technical contact
for information about frequency range, measurement uncertainty, and
fees. |
| Precision
Sound Level Meters (A33-01-02-01 to A33-01-02-03) |
A33-01-02-01
Sound Level Meter
$1000
|
This
service applies to one meter that can be fitted with a condenser microphone
and comprises "Fast" and "Slow" responses, weighting
networks, step attenuators, and linear frequency response. At the
reference sound pressure level for the particular instrument, the
uncertainties are sufficient to ensure that the sound level meter
meets the tolerances of the IEC and ANSI standards of ±0.4
dB for type 0 and ±0.7 dB for type 1 instruments.
See the calibration services for microphones for calibration of the
microphone that is fitted to the sound level meter. |
A33-01-02-02
Partial Check
(Step Attenuators)
$600
|
This calibration covers step attenuators
and sound pressure level sensitivity at a reference frequency. |
A33-01-02-03
Partial Check (Weighting Network)
$600
|
This
service calibrates the weighting network and sound pressure level
sensitivity at a reference frequency. |
A33-01-02-04
Other Acoustical Measuring Instruments
Fee on request.
|
Contact Dr. George Wong (Tel. 613-993-6159;
Fax. 613-990-8765). |
The Program does full and partial calibrations of the meters covered
in the services listed below. To discuss calibrations of instruments with
other types of microphones and other types of acoustical measuring instruments
and systems, such as measuring amplifiers, refer to the technical contact.
| Sound
Level Calibrators (A33-01-03-01 to A33-01-03-06) |
A33-01-03-01
$550
|
Calibration
of one field sound calibrator, such as the Brüel and Kjaer
4230 with a single sound pressure level and a single frequency. The
best uncertainty is 0.1 dB when coupled to a particular type of condenser
microphone.
See A33-01-03-04 for calibration of pistonphones.
|
A33-01-03-02
$650
|
This service calibrates one calibrator,
with a single sound pressure level and up to five frequencies, with
an uncertainty of 0.3 dB when coupled to a particular type of condenser
microphone. |
A33-01-03-03
$850
|
One
calibrator, with up to five sound pressure levels and up to six frequencies,
is calibrated with an uncertainty of 0.3 dB when coupled to a specified
particular type of condenser microphone. |
A33-01-03-04
One Pistonphone Standard Calibrator
$900
|
Calibration of one pistonphone sound
calibrator, with a single sound pressure level and a single frequency.
The sound pressure level is corrected to reference environmental conditions
and the calibration report includes the correction term for deviations
from the reference static pressure of 101.325 kPa. The best uncertainty
is 0.1 dB when coupled to a particular type of laboratory standard
microphone. |
A33-01-03-05
Multifunction Calibrator
$2000
|
This
service is available for a multifunction calibrator, from 31.5 Hz
to
16 000 Hz, at levels of 94dB, 104 dB, and 114 dB. It involves the
measurement of inverse A-weighted response, crest factor measured
at a level of 94 dB, and time weighting ("Fast" and "Slow"). |
A33-01-03-06
$650
|
One calibrator with two sound pressure
levels at one frequency is calibrated with an uncertainty of 0.3 dB
when coupled to a particular type of condenser microphone. |
| Accelerometers |
A33-01-04-01
$2000
|
Calibration
of accelerometer by absolute interferometric measurement of sensitivity
at 160 Hz with an uncertainty of 0.5% and frequency response at one-third
octave frequencies from 20 Hz to
5 000 Hz with selected peak acceleration from10 m/s²with an uncertainty
of 1%.
Please refer to the technical contact for other requirements for measurement
of frequency response. |
A33-01-04-02
$1000
|
As A33-01-04-01 above, except:
frequency response is measured over the range of 20 Hz to 800 Hz only. |
A33-01-04-03
$1000
|
As
A33-01-04-01 above, except:
the absolute sensitivity is measured at 800 Hz with uncertainty of
1%, and frequency response is measured over the range of 800 Hz to
5 000 Hz only. |
A33-01-04-04
$1000
|
Accelerometer calibration by comparison
with a reference accelerometer at not more than four selected frequencies
from 2 Hz to 10 Hz, with an uncertainty of 3%. |
A33-01-04-05
Fee on request
|
A
sinusoidal calibration by comparison with a reference standard accelerometer
is first performed to ensure that the accelerometer is in good condition.
The best measurement uncertainty is 1%.
A shock calibration of the accelerometer (or the accelerometer with
an associated charge amplifier) is then performed by comparison with
a reference standard accelerometer. The shock calibration is for acceleration
in the range from 200 m/s² to 100 000 m/s². The measurement
uncertainty is dependent on shock duration, with a best measurement
uncertainty of 3%. |
A33-01-04-06
Fee on request
|
A shock calibration of the accelerometer
(or the accelerometer with an associated charge amplifier) is performed
by comparison with a reference standard accelerometer that has been
calibrated by interferometry. The shock calibration is for acceleration
in the range from 200 m/s² to 100 000 m/s². The measurement
uncertainty is dependent on shock duration, with a best measurement
uncertainty of 3%.
To ensure the integrity of the shock accelerometer, the laboratory
may first check one or two points of the accelerometer's response
curve by sinusoidal comparison. |
A33-01-04-07
$850
|
A
sinusoidal calibration by comparison with a reference accelerometer,
calibrated by interferometry, at frequencies from 16 Hz to 5000 Hz.
The measurement uncertainty is dependant on frequency, with a best
measurement uncertainty of 1%. |
| Medical
Ultrasound Measurement and Calibration |
A33-01-05-01
$1100
|
A
small portable NRC ultrasound power balance is calibrated and delivered
to the client's address by courier service. The client retains the
balance to facilitate the calibration of therapeutic transducers and
systems before returning the balance to NRC by a courier service.
An additional $100 per day is added to the following fees if the balance
remains with the client for more than two days. NRC will calibrate
the balance upon receipt and notify the client in writing to confirm
the performance of the portable ultrasound balance, which has a resolution
of < 0.1 W in a range of 10 W with a best uncertainty of 7%. |
A33-01-05-02
$150 |
A service to calibrate the power output of medical
ultrasound devices such as those used in diagnostics and physiotherapy:
The calibration of one or two probes of a device, at a maximum of
five power settings, in the range from 0.5 W to 5W, with a best measurement
uncertainty of 4%.
The fee does not include delivery of the devices to or from INMS.
If prior arrangement is made with INMS, the expected turnaround time
(betwen receipt and dispatch) for the calibration is within two working
days.. |
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