Calibration

Calibration means that measurement results are compared to a standard. Results that are obtained by calibration are traceable to the International System of Units (SI) applying unit standards and fundamental
physical constants protected by national metrology institutes.

If the calibration scope falls within the area of VMC accreditation, we present the results in calibration
certificates marked with accreditation and ILAC MRA marks. This means that the Lithuanian National
Accreditation Bureau, which accredits the VMC calibration laboratory, is a full member of the International
Laboratory Accreditation Organization (ILAC), a signatory of the ILAC Mutual Recognition Agreements
(MRAs), therefore documents issued by the VMC calibration laboratory can be recognized internationally.

However, we suggest considering calibration not only as a result of measurements and the presentation of
related measurement uncertainties in a table.

Calibration is a method of conformity assessment. At your request, we will perform a conformity
assessment of the measuring instrument based on the obtained calibration results. We will assess whether
the device meets the requirements of the standards, the manufacturer’s specification or the requirements
set by you.

After receiving the calibration certificate, you will be able to make decisions on the acceptability of the
device’s characteristics, further use and assess of the associated risks.

AB “Vilniaus metrologijos centras“ policy on declaration of conformity in calibration certificates (decision
rule policy).

When providing measuring instruments for calibration, it is necessary to decide which parameters and their
values will be measured and evaluated. Unlike metrological verification, where the scope of the
verification is determined by law, the parameters to be calibrated are determined by the owner of the
measuring instrument.

If you are unsure or have doubts about the scope of the calibration, we will help you by offering a list of
minimum baseline calibration points. We have prepared such lists for measuring instruments of various
purposes.

When preparing the base of calibration points lists, we follow:

– Requirements of international standards;
– International Metrology Organizations (EURAMET, OIML and others.) leaders and
recommendations;
– Experience and recommendations of metrology institutes and scientists of other countries;
– Recommendations of measuring equipment manufacturers;
– Our accumulated best measurement practice;
– Provision that the calibration points must be properly and practically selected at least in the
measuring range in which the measuring instrument will be used.

We will provide a list of base calibration points for a specific measuring instrument during order matching.
If you consider the choice of calibration points to be right for you, we will ask you to confirm this by
signature or e-mail.

Please note that the variety of measuring instruments is very wide, so sometimes due to the specifics of the
instrument it is not possible to select specific baseline calibration points. However, we will be able to
provide assistance by sharing good measurement practice

Policy on declaration of conformity
Decision rule

Lenght and angle measuring instruments
  • Calibres;
  • Optimeters;
  • Optical meters;
  • Weighting instruments;
  • Spirit levels;
  • Log simulators;
  • Parts, installations;
  • Microscopes;
  • Opticators;
  • Watch-type indicator check instruments;
  • Interferometers;
  • Meter-comparators;
  • Ultrasonic contact thickness gauges;
  • Geniometers;
  • Sliding altimeters;
  • Microcators;
  • Examinators;
  • Comparators;
  • Deflection gauges;
  • Micrometric calipres;
  • Step-shaped gauges;
  • Indicator calipres and thickness gauges;
  • Rings;
  • Displacement mandrels;
  • Standard models of the company;
  • Optical micrometers;
  • Roughness gauges;
  • Verification bricks;
  • Blanks;
  • Liquid level gauges;
  • Level gauges;
  • Length gauges;
  • Road length gauges;
  • French curves;
  • Glass plates and other surfaces;
  • Surface flatness and straightness gauges;
  • Flat angle gauges;
  • Angle gauges;
  • Contact angle gauge check instruments.
  • Dynamometers;
  • Torque spanners from 0.2 Nm to 3000 Nm;
  • Testing machines.
  • Sound level meters;
  • Vibration meters;
  • Sound level calibrators, pistonphones;
  • Vibration calibrators;
  • Sound level monitoring systems;
  • Sound level monitoring system analysers;
  • Piezo ceramic accelerometers;
  • Inductive accelerometers;
  • Wireless accelerometers
  • Vibration stands, tables, platforms.
  • Electrical inductance standards;
  • Electrical inductance meters;
  • Inductance boxes;
  • Capacitance meters, capacitance boxes and capacitance standards;
  • Voltage dividers;
  • High voltage testing equipment;
  • Electricity network analysers.
  • Phase meters;
  • Power meters;
  • Calibrators, sources of direct and alternating voltage, direct and alternating current, resistance, capacitance;
  • Kilovoltmeters;
  • Multimeters and other direct and alternating voltage, direct and alternating current, resistance, capacitance, power meters;
  • Voltage standards;
  • Sine wave generators;
  • Resistance standards;
  • Resistance boxes;
  • Analogue and digital frequency meters, time interval meters, multi-functional time and frequency measuring instruments;
  • Sine wave generators, quartz generators;
  • Pulse generators;
  • Function generators, arbitrary waveform generators;
  • Voltage calibrators;
  • Universal oscilloscopes;
  • Universal analogue and digital oscillographs;
  • Tachograph testing equipment;
  • Ultrasonic flaw detectors;
  • Spectrum analysers;
  • Delay lines;
  • Special purpose measuring instruments (communication testing equipment, PSTN lines  testers, etc.);
  • Automatic medication dispensers;
  • Singe-channel and multi-channel pipette dispensers;
  • Hectolitre meters;
  • Class E2, F1, F2, M1, M2, M3 weights;
  • Automatic and semi-automatic weighing instruments;
  • Vehicle weighing instruments;
  • Electronic weighing instruments;
  • Electronic recording weighing instruments;
  • Laboratory weighing instruments;
  • Equal-arm, steelyard, table, rotary weighing instruments;
  • Wagon weighing instruments;
  • Automatic weight dosing dispensers with 2 and 3 weight heads;
  • Weight dosing dispensers and weighing instruments.
  • AA spectophotometers;
  • Illuminance measuring instruments;
  • Photo colorimeters;
  • Photometers;
  • Colorimeters;
  • Flame photometers;
  • Lux meters;
  • Polarimeters;
  • Refractometers;
  • Spectrophotmeters.
  • Accuracy Class 2(B) glass volumetric measures up to 500 ml (pipettes, burettes, flasks, cylinders, test tubes, rain gauges, beakers);
  • Accuracy Class 2(B) glass volumetric measures over 500 ml (flasks, cylinders, beakers);
  • Accuracy Class A glass volumetric measures up to 500 ml (flasks, cylinders, pipettes, burettes);
  • Accuracy Class A glass volumetric measures over 500 ml (flasks, cylinders);
  • Accuracy Class A glass burettes;
  • Oil dispensing meters with displays;
  • Auto-tanks;
  • Chamberless narrowing devices;
  • Bottle counters;
  • Fuel metering systems;
  • Differential manometers – flow meters without integrators;
  • Remote recording level gauges and deviance measuring devices;
  • Chamber narrowing devices;
  • Fuel dispensers;
  • Fuel tanks;
  • Masstrol-type computer with one flow meter;
  • Conical metal beakers;
  • Milk meters;
  • Petrov’s device PPR;
  • Scaling and technical gauges;
  • Heat meters;
  • Liquefied gas filling dispensers;
  • Lubricant dispensers;
  • Hot and cold water meters.
  • Vehicle tyre pressure gauges;
  • Multi-variable pressure transducers IPDC;
  • Deformation manometers;
  • Oxygen manometers;
  • Distance manometers MTS;
  • Electronic arterial blood pressure devices: automatic and semi-automatic;
  • Manometers – electro-contact, control, laboratory;
  • Micromanometers with slanted tubes;
  • Digital manometers/calibrators;
  • Pressure transducers;
  • Pressure gauges, traction meters;
  • Stationary blood pressure monitors;
  • Weighted piston manometers and weighted piston manometers with
  • a set of weights up to 60 kg and over 60 kg. II and III separation MP type;
  • Weighted piston vacuum manometers MVP- 2.5;
  • Technical manometer vacuum meters;
  • Singe range pressure transducers.
  • Automatic bridges and potentiometers;
  • Bimetal thermometers and thermomanometers;
  • Reference and working rhodium-platinum/platinum thermoelectric converters;
  • Multi-variable indicating temperature meters;
  • Electro-contact thermometers;
  • Hygrographs;
  • Hygro-thermometers;
  • Infrared gauges;
  • Laboratory thermometers;
  • Maximum clinical electronic thermometers;
  • Manometric thermometers;
  • Medical mercury thermometers;
  • Millivolt meters with a CT element;
  • Air temperature humidity meters;
  • Displaying and recording logometers and millivolt meters;
  • Brightness working pyrometers;
  • Digital temperature and humidity meters;
  • Digital thermometers;
  • Digital temperature gauges with external and internal sensors;
  • Glass laboratory and technical thermometers;
  • Temperature transducers Pt 100/-20mA;
  • Temperature and humidity accumulators;
  • Thermometers (working resistance heat exchangers);
  • Thermometers for accurate measurements;
  • Thermocouples;
  • Low temperature glass thermometers;
  • Low temperature meteorological thermometers;