It is supplied with the following
metrological reference laboratories: Capacitance and Inductance
laboratory; Power, Energy and Resistance laboratory; Potential Difference
and Electrical Current laboratory; Transformer laboratory.
o support the performance of its institutional
mission, it is up to the Electrical Metrology Division to realize
and maintain the units of the International System of Units (SI)
related to electricity, disseminating them through the different
segments that require metrological services, offering reliability
to basic services of quality and to the infrastructure of competitiveness.
The development of R&D activities
in metrology and the participation in interlaboratorial
comparison programs are also part of the Division´s tasks.
The Division´s laboratories concentrate and give priority
to its role as Inmetro´s metrological laboratory, whose main
task is the custody of the national standards. The participation
in programs of interlaboratorial comparison, promotes the maintenance
of the SI units, as well as their dissemination to accredited laboratories.
The Division only
carries out tests or calibrations of metrological standards belonging
to industrial laboratories , or from other sectors, under exceptional
circumstances, such as when the Accredited Laboratories Network
is unable to perform the service required. The Division´s
laboratories are committed to always keep the highest levels of
accuracy and the lowest experimental
uncertainties that can be achieved in the measuring process.
The Division offers services of calibration of specific instruments,
standards and instruments for measuring voltage, current, resistance,
capacitance, inductance, power, energy and services of calibration
of transformers, required by laboratories accredited by Inmetro
in the Brazilian Calibration Network (RBC), the Brazilian Network
of Test Laboratories (RBLE) and also by laboratories linked to the
Brazilian Network of Legal Metrology and Quality (RBMLQ). Among
the innumerous measuring ranges, types of instrument and associated
uncertainties, the Division performs calibration of standard voltage
cells, standard AC/DC thermal converters, AC phase angle meters,
AC/DC voltage and current sources , resistors, capacitors, inductors,
resistance, capacitance and inductance meters, AC/DC power sources,
power factor meters and electrical energy and power meters.
Development of metrological programs for comparing standards;
projects and qualification of measuring instruments;
development of techniques and procedures for test and calibration;
elaboration of technical regulations; i installation of quality
In the area of development, the Division,
in partnership with metrological institutions from Brazil and overseas,
coordinates the following projects, based on the field of metrology:
expansion of measuring range of AC voltage; ratification of power
meters; Henry´s standardization; expansion of the resistance
measuring range; standardization of AC voltage; realization of the
volt using the Josephson effect (quantum standard); realization
of the ohm using the quantum Hall effect; expansion of the capacitance
measuring range at different frequencies; improvement of the metrological
reliability in the calibration
of the standards of energy and power.
Standards of Reference
In the domain of Electrical Metrology, the Division is responsible
for the custody of the national metrological standards, which are
systematically traced and compared to international standards though
Key Comparisons under the
supervision of the Bureau International des Poids et Mesures and
to standards of metrological laboratories of other countries, namely
the National Institute of Standards and Technology (NIST/USA) and
the Physikalisch-Technische Bundensanstalt (PTB/Germany). In particular,
the Division maintains highly accurate standards regarding voltage,
resistance, capacitance, inductance, energy and power.