Transcript The World Radiometric Reference and its Quality System ISO/IEC 17025 Introduction PMOD/WRC Tasks IPC Metrology Quality System Organization Responsibilities Management Reqirements Technical Requirements Comparison WRR/SI Outlook Wolfgang Finsterle, Isabelle Rüedi, and Silvio Koller TECO2005 WRC/PMOD Quality Management.

The World Radiometric Reference
and its Quality System ISO/IEC 17025
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
Wolfgang Finsterle, Isabelle Rüedi, and Silvio Koller
TECO2005
WRC/PMOD Quality Management
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World Radiation Center
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
The World Radiation Center (WRC) is operated by
the Physikalisch-Meteorologisches Observatorium
Davos (PMOD) by appointment of WMO. The WRC
is financed by the Swiss governement.
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
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WMO Mandate to WRC
Introduction
PMOD/WRC
Tasks
IPC
Metrology

Note:
The WRR has been defined in 1980 based on the mean value of 15 absolutely
characterized cavity radiometers. The WRR is the primary standard for solar
irradiance.
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
Today the WRR is realized by the WSG, a group of currently six reference
pyrheliometers permanently installed at PMOD/WRC.


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To maintain the World Standard Group (WSG)
for the realization of the World Radiometric
Reference (WRR)
To ensure at all times the highest possible
quality of its standards and testing equipment
To serve as calibration center for regional
radiation centers worldwide
WRC/PMOD Quality Management
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Calibration Tasks
Introduction
Calibration of:
PMOD/WRC
Tasks
IPC
Metrology
 Pyrheliometers
 Pyranometers
Quality System
with the Sun as source
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
World Standard Group
WSG candidates
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IPC - International Pyrheliometer
Comparison
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
 This key event is
held every 5 years
since 1959
 The goals are:
- to ensure the
homogeneity of
solar irradiance
measurements
worldwide
- to monitor WRR
stability
IPC-IX 2000
 Participating instruments are compared to the
mean value of WSG instruments
 validation of WRR stability based on IPC results
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WMO, BIPM, and the WRR
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
 WMO and the Bureau International des
Poids et Mesures (BIPM) co-operate to
ensure that meteorological data are
traceable to SI units
 The quantity ‘Solar Irradiance’ was
proposed to the Consultative Committee
on Photometry and Radiometry (CCPR)
 The ‘connection’ between the WRR
(W/m2) and SI units needs to be
validated
WRC/PMOD Quality Management
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The Need for a Quality System
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
 The WRR was originally defined in 1980 as
the average of 15 absolutely characterized
cavity radiometers
 Since then it has served the meteorologial
community as the primary standard for solar
irradiance
 Several ISO standards now require
traceability to the WRR
 The WRR is no longer only a meteorological
standard but accepted in a much wider
metrological community
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Why ISO/IEC 17025?
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
International recognition in the formal framework of the CIPM
Mutual Recognition Arrangement (MRA) requires a Quality
System (QS) according to the international standard
ISO/IEC 17025. Conformance with ISO/IEC 17025 is also
more and more requested by calibration customers.
The QS at PMOD/WRC was introduced in December 2004 and
presented to EUROMET QS-Forum 12 in February 2005.
Major goal of the quality system:
To maintain the WSG and thus the WRR with
the highest possible stability and to provide the
highest possible world-wide homogeneity for
solar irradiance measurements.
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QS Organization
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
At this time the Quality System at PMOD/WRC covers
only the department of ‘Absolute and Shortwave
Radiometry’. It is planned to be extended in the future
to cover all departments at PMOD/WRC.
PMOD / WRC Quality Management
Quality Manger
Department
Absolute and
Shortwave
Radiometry
Department
Infrared Radiometry
Department
WORCC
Not yet integrated
Not yet integrated
Head of Department
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QS Responsibilities
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality
Manager
 Top
Head of
Department
 Transfer
Laboratory
Assistant
 Execution
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
level QS tasks
 Improvement and adaptation of the quality
management handbook and associated
documentation
and implementation of top level QS into
department
 Full responsibility for department specific QS
issues
 WSG and data evaluation
WRC/PMOD Quality Management
and records of calibration tasks
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Management Requirements
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
ISO/IEC 17025 requires standard procedures,
mechanisms, and plans to be followed for
1.
2.
3.
4.
Document Control
Contracts
Changes / Complaints / Non-conformities
Audits / Management Reviews
 The goal was to introduce already used, well-established
processes into QS and to adapt them only where
necessary
 1 and 2 were basically existing, 3 and 4 had to be defined
and implemented
 Short experience time
=> usefulness and user friendliness still have to be proven
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QS Technical Requirements
Calibration / Validation
Introduction
PMOD/WRC
Tasks
IPC
Metrology

Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
Data evaluation procedures and
timing definitions for every
instrument type need to be
documented
– Pyrheliometers: based on ISO 9059
– Pyranometers: based on ISO 9846


Differences to standards are stated
in QS documentation
Techniques:
– Use of reference standards
(voltmeters)
– Indirect comparison WSG <>
cryogenic radiometer
– Assessment of uncertainties
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QS Technical Requirements
Introduction
PMOD/WRC
Tasks
IPC
Metrology
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
Environmental Conditions
–
–
–
–
Clear sky
Continuous weather watch during the calibration
Standard room temperature at data acquisition unit
Prohibited use of cell phones near DAQ hardware
ISO/IEC 17025 requires Traceability to SI units, but:

WRR is a primary reference
WRR is the only primary reference for solar irradiance in the
world (no key comparisons possible)
To-date cryogen radiometers cannot measure solar irradiance
 only indirect power comparisons are possible
Power comparisons to national cryogen standards

Reference voltmeter calibration at certified laboratory
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

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QS Technical Requirements
Introduction
PMOD/WRC
Tasks
IPC
Metrology
ISO/IEC 17025 requires detailed estimates of the
uncertainties

Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
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
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Individual estimates of uncertainties for each WSG member
instrument were calculated
Original estimate of absolute uncertainty for the WRR
relative to SI units is +/- 0.3%
Relative uncertainty WRR transfer < 300 ppm
(Confirmed by IPC 1985 – 2000 results)
Individual estimates of uncertainties for different calibration
items (instrument types) were calculated
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Comparison WRR/SI
Results from recent intercomparisons between the WRR and
cryogenic standards at METAS (Bern) and NPL (London)
Introduction
PMOD/WRC
Tasks
IPC
Metrology
1.001200
metas
NPL
1.001000
Quality System
1.000800
1.000600
WRR/SI
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
1.000400
1.000200
1.000000
0.999800
0.999600
0
20
40
60
data sample
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80
100
by Sandra Moebus
Outlook
Introduction

PMOD/WRC
Tasks
IPC
Metrology

Implement requests from
EUROMET QS-Forum 12
1st review of PMOD/WRC QS

Challenging tasks:
Quality System
Organization
Responsibilities
Management
Reqirements
Technical
Requirements
Comparison
WRR/SI
Outlook
TECO2005
– Enlargement of parallel data
acquisition capability (2-3 years)
– DAQ S/W development for
IPC 2010
– Integration of the remaining two
PMOD departments
(Infrared and WORCC)
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pmodwrc.ch
Thank you! Any questions?
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