Calibration of meters

Metrology is a field that significantly affects the quality of products and services. EZÚ offers calibration of work meters and gages in its capacity as the calibration laboratory no. 2294, accredited by the Czech Accreditation Institute in accordance with the ISO/IEC 17025, and authorized by the Office for Standards, Metrology and Testing as a center for calibration services according to the Metrology Act. We carry out calibration in our own laboratory and also off-site on our customers’ premises.

Scope of meter calibration:

Electric quantities
DC voltage 0 to 100 kV
AC voltage 0,1 mV to 100 kV
amplitude of impulse voltage 1,8 mV to 30 kV
impulse rise time from 0,7 ns
impulse duration time 2 ns to 5 s
direct current 5 pA to 1000 A
alternating current 1 mA to 1000 A
DC resistance 0.1 mΩ to 100 TΩ
AC resistance 0.1 Ω to 100 kΩ
AC resistance 1 mΩ to 100 kΩ
module of impedance 1 mΩ to 100 kΩ
low-frequency power 10 mW to 21 kW
power factor 0 to 1
AC resistance 0.1 Ω to 100 kΩ
capacity 1 pF to 100 µF
loss coefficient of capacity 0 to 1.6
inductivity 0.1 mH to 10 H
high-frequency power 20 pW to 200 mW
rebound factor module 0 to 1

Types of calibrated meters

  • analog and digital voltmeters, ammeters, tong ammeters and multimeters
  • power supply units and voltage and current calibrators, high-voltage sources, electrostatic field meters
  • meters of low resistance, insulation resistance, inspection devices
  • gage resistances and resistance decades
  • watt meters
  • analog and digital oscilloscopes, impulse and signal generators, other devices calibrated by the measurement of high-frequency power and rebound factor
  • RLC meters and gages
Light quantities
luminance 1 cd to 10000 cd
light flow 50 lm to 10000 lm
chromatic temperature 2000 K to 2900 K
illumination 1 lx to 50000 lx
brightness 5 cd/m2 to 500 cd/m2

Types of calibrated meters

  • light gages, light flow and chromaticism temperature
  • timers
Range -50 °C to 420 °C

Types of calibrated meters

  • electronic thermometers
  • temperature chamber thermometers
Time and frequency quantities
frequency 0,1 Hz to 3 GHz
time interval 5 ns to 100000 s
speed 30 min-1 to 10000 min-1

Types of calibrated meters

  • counters, generators
  • stopwatches
  • revolution counters

Jan Holub

JobProduct Manager

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Why use the services of the EZÚ calibration laboratory?

  • Quick and precise execution of calibration
  • Guarantee of independent verification – increasing trust in relation to business partners

Compliance with legislative requirements for products subject to metrological verification

  • The Metrology Act no. 505/1990 Coll. defines the rights and obligations of physical persons – entrepreneurs, legal entities and public administration authorities in the scope necessary to ensure the consistency and accuracy of meters and measurements.
  • The Decree no. 345/2002 Coll. specifies meters that are subject to compulsory verification and meters subject to type approval. The annex of this Decree contains a list of meters (photometers are under item no. 5.1.2 with 2-year validity of verification).
  • The Decree no. 65/2006 Coll., amends the Ministry of Industry and Trade Decree no. 345/2002 Coll., defining meters subject to compulsory verification and meters subject to type approval.
  • Verification can be carried out for approved types of photometers and for specific devices that are already in use at the time of the announcement of specified meters (the Decree no. 345/2002 Coll. of July 11, 2002)