||What are NABL /
Nationally Accredited Laboratory?
Globally, calibration expertise
is independently evaluated and affirmed when a
Calibration agency undergoes third party accreditation
to the International Standards, ISO/IEC 17025
In each country it has its APEX Laboratory who
hold Ref Standards which are derived from International
Standards which are kept in Geneva. Also it has
a Body/Board which evaluates all laboratories
in accordance with ISO/IEC 17025:2005.This body/Board
is empowered by respective Governments to carry
out evaluations and to issue Certificates of Evaluations.
All such Bodies/Boards are at par by authority.
In India we have a "National Accreditation
Board for Test & Calibration Laboratories".
This board is empowered by act of Parliament of
Government of India to evaluate and offer Accreditation
to Test and calibration Laboratories in India.
Calibration is occasionally viewed
by organizations as an undesirable overhead rather
than as a Quality Assurance Tool. As such, calibration
is often being seen as an IMPOSITION by an outside
party rather than as an integral part of an organization's
OVERALL QUALITY MANAGEMENT SYSTEM. Proper calibration
of critical equipments / instruments is central
to your company's service and reputation, whether
you are a manufacturer, service provider, supplier
or small business.
An incorrectly calibrated piece of critical equipment
has a FLOW IN EFFECT on your product and services
that can be devastating to both, your business
and that of your customer. Product recalls and
litigations are increasingly common outcome that
can be traced back to seemingly innocent pieces
measuring / controlling instruments operating
quite happily outside their performance specifications.
Does getting instruments calibrated
from Accredited Laboratory adds value to my products
Proper calibration of instrumentation
and equipments relies heavily on the skill, expertise
and technical knowledge of the individual performing
the work of calibration, interpretation and reporting
It is important to select a calibration laboratory
which is Nationally Accredited by Third Party
(In India by NABL, which is equivalent to NIST
in USA). Accredited Laboratories are assessed
periodically for its competence to perform the
Globally, calibration expertise is independently
evaluated and affirmed when a Calibration agency
undergoes third party accreditation to the International
Standards, ISO/IEC 17025. Not all calibration
agencies have Accreditation to ISO/IEC 17025.
Some may have ISO 9000 certification, and many
have no independent credentials at all. Some have
been operating for many years, but this does not
necessarily mean they are doing things CONSISTANTLY,
CORRECTLY OR IN ACCORDANCE WITH RELEVENT STANDARDS.
Staff change, management change, and expertise
and skill flow in and out of these agencies as
with any business. Because calibration is so DEPENDANT
on individual skill and expertise of the service
Personnel performing the activity, the issues
of Training and ongoing education are very crucial
in Calibration Agencies.
Accreditation to ISO 17025 cover not only management
side, but also Issues of technical competence
are effectively addressed. Specialist Evaluators
,who are who are themselves Calibration Experts
rather than generalist auditors, focus on Establishing
the knowledge and skill of service personnel and
overall technical capability of the agency in
addition to ISO 9000 management elements.
The proper calibration of critical equipments
is so crucial to your company's service and reputation
that you cannot afford to rely simply on assurance
by service provider that they know what they are
||How to choose Calibration Interval?
||A large number of factors influence
the frequency Of Calibration Interval. The most
important are as follows.
||Type Of Equipment
||Extent and Severity
wear out and Drift.
In Service Checks.
||Trend Data obtained
from Previous Calibration Records.
||Cost Of calibration
in using faulty Instrument
||What is the "Scope of
The list of specific tests, types
of tests or calibrations for which a laboratory
is found competent is listed in scope of accreditation
along with details like test methods, ranges,
uncertainties etc. The final content of the scope
is recommended by the assessors and approved by
Courtesy: NABL Website (www.nabl-india.org)
||What is "uncertainty of
Uncertainty has traditinally
been defined as a range of values, usually centered
on the measured value, that contains the true
with stated probability. A measurement result
and its uncertainty traditionally were reported
as "Quantity=Value +/- Uncertainty.
Uncertainty of measurement is
important for the critical equipments used for
Testing & Calibration purposes. As per ISO/IEC:17025,
every Calibration laboratory must report the Uncertainty
of measurement for every measurements performed.
is very important to note that scope don't always
include all the laboratory's capabilities. This
is due either to the laboratory's request to limit
the scope, or because the assessors have not been
able to affirm the laboratory's competency in
all areas for which the laboratory was seeking
accreditation. Capabilities that are not listed
on the scope of accreditation are not covered
by the laboratory's NABL accreditation.