Bureau of Meteorology

Site

Bureau of Meteorology

Accreditation No.

20270

Site No.

24147

Date of Accreditation

17 May 2018

Address

Level 5, 700 Collins Street
Docklands , VIC 3008
Australia

bom.gov.au

Contact

Mr Dallas Benbow P: +61 (03) 96694219

Availability

Services conditionally available to external clients

Bureau of Meteorology address map

Scope of Accreditation

Print scopes
Bureau of Meteorology

ISO/IEC 17025 (2017)

Calibration

  • The uncertainty of measurement is reported as an expanded uncertainty having a level of confidence of 95% unless stated otherwise
Service Product Determinant Technique Procedure Limitations
DC and low frequency electrical metrology - Electrical measurement and test equipment Automatic weather station data acquisition system Pulse count to mm of rainfall conversion Direct measurement by electrical input

Capability

R/mm = (0.2 mm) x pulse count, where R is the rainfall expressed in millimetres of rainfall (volume divided by area) and the number of counts is in the range of (0 to 101) counts, for all AWS Data Acquisition Systems
 
with Calibration and Measurement Capability of

0.21 mm at 20.2 mm of simulated rainfall, with a maximum frequency of 360 mm/hr

Frequency to windspeed conversion Direct measurement by electrical input in air at temperatures from -30 °C to 60 °C

Capability

v/kn = 1.094 8 (f/Hz) + 1.57, where v is wind speed expressed in knots and f is frequency expressed in Hertz in the range of (0 to 139) Hz, for the ALMOS MSI Data Acquisition System v/kn = 1.079 9 (f/Hz), where v is wind speed expressed in knots and f is frequency expressed in Hertz, for the Vaisala AWSS320 Data Acquisition System

with Calibration and Measurement Capability of
0.8 knots from 0 knots to 150 knots of simulated windspeed


Voltage to wind direction conversion Direct measurement by electrical input in air at temperatures from -30 °C to 60 °C

Capability

φ/° = (357°) x [(Vsig/V) / (Vexcite/V], where φ is the azimuth angle of wind direction expressed in degrees and Vsig and Vexcite are DC voltages in the range of (0 to 4) V, for all AWS Data Acquisition Systems
with Calibration and Measurement Capability of
0.7 ° from 0° to 357° of simulated wind direction


Pressure metrology - Pressure and vacuum measuring equipment Barometers Absolute pressure Comparison with reference instrument

Capability

with Calibration and Measurement Capability of -
0.025 hPa from 700 hPa to 1100 hPa

Temperature metrology - Ancillary temperature measuring equipment Automatic weather station data acquisition system Resistance to temperature conversion Direct measurement by electrical input In air at temperatures from -30 °C to 60 °C

Capability

with Calibration and Measurement Capability of
0.03 °C at simulated temperatures of -30.6 °C, -8.9 ºC, 0.0 ºC, 28.3 ºC, 52.9 ºC and 62.0 ºC (RTD Pt100 385 – conversion equation based on IEC 60751)
Resistance bridges Resistance to temperature conversion Direct measurement by electrical input RIC-TP-001-WI

Capability

1 μΩ/Ω at 25 Ω and
3 μΩ/Ω at 100 Ω
Temperature metrology - Humidity measuring equipment Automatic weather station data acquisition system Voltage to relative humidity conversion Direct measurement by electrical input In air at temperatures from -30 °C to 60 °C

Capability

U/%rh = 100 (VDC/V), where U is relative humidity in the range of (0 to 100) %rh and VDC is DC voltage in the range of (0 to 1) V, for all AWS Data Acquisition Systems
 
with Calibration and Measurement Capability of
0.75 %rh at from 0 %rh to 100 %rh of simulated humidity


Temperature metrology - Temperature measuring equipment Digital temperature measuring systems; Metallic resistance thermometers Temperature Measurement against reference standard RIC-TP-004-WI

Capability

(excluding thermocouples)
with Calibration and Measurement Capability of
15 mK from -30 ºC to 60 ºC
Temperature metrology - Temperature standards and reference equipment Platinum resistance thermometers (PRTs) reference standards Gallium melting point; Indium (In) freezing point; Mercury (Hg) triple point; Water triple point Direct measurement against a reference standard RIC-TP002-WI

Capability

with Calibration and Measurement Capability of
5.0 mK from -38.9 °C to 156.6 °C

The only data displayed is that deemed relevant and necessary for the clear description of the activities and services covered by the scope of accreditation.

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