Calibration

Calibration 2023-10-10T14:31:44+00:00

Calibration is a set of actions, which are carried out under prescribed environmental conditions, to establish a correlation between the value measured by a measuring instrument, the existing value of material measure or reference material and the value which have been reproduced according to the standard of the unit of measure concerned.
The Regulations No.693 of the Cabinet of Ministers of the Republic of Latvia state requirements for calibration of measuring instruments, as well as the list of measuring instruments for calibration and calibration periodicity in Latvia.
In the mandatory scope laboratory is accredited to perform calibration of:

  • metal capacity measures for alcohol and petroleum products,
  • storage tanks for alcohol and petroleum products,
  • consumption meters, which are not built-in tanks or measuring systems, for alcohol and petroleum products,
  • automatic level gauges for measuring the level of liquid in stationary storage tanks,
  • pressure gauges installed in the pressure equipment and manufactured in accordance with the normative acts on pressure equipment, except pressure gauges which are subject to verification in accordance with the normative acts on the State metrological control of measuring instruments subject list,
  • multimeters (voltmeters, ammeters, wattmeters),
  • current clamps,
  • ohmeters, megohmmeters, earth resistance meters,
  • thermometers for measuring temperature of alcohol and petroleum products,
  • explosive gas concentrations detectors.

V&V VentMet laboratory Ltd. performs calibration of the following measuring instruments in the accredited scope, by ensuring the traceability of measurements to the national and international standards:

Measured quantity / Measuring instrument Measuring range Calibration and measurement capability expressed as an expanded uncertainty at k=2(±)
Mass / Weights 1 mg
2 mg
5 mg
10 mg
20 mg
50 mg
100 mg
200 mg
500 mg
1 g
2 g
5 g
10 g
20 g
50 g
100 g
200 g
500 g
1 kg
2 kg
5 kg
10 kg
20 kg
500 kg		 0.010 mg
0.014 mg
0.014 mg
0.014 mg
0.014 mg
0.015 mg
0.016 mg
0.016 mg
0.029 mg
0.021 mg
0.025 mg
0.058 mg
0.046 mg
0.053 mg
0.080 mg
0.19 mg
0.58 mg
5.1 mg
5.7 mg
7.2 mg
15 mg
27 mg
54 mg
11.5 g
Mass / Non-automatic weighing instruments
I accuracy class
II accuracy class
III, IIII accuracy class 		up to 30 kg
up to 60 kg
1 g ÷ 30 kg
30 kg ÷ 5000 kg
5 t ÷ 60 t 		0.0028 mg ÷ 0.065 g
0.0028 mg ÷ 0.023 g
0.30 mg ÷ 0.44 g
0.44 g ÷ 0.077 kg
0.077 kg ÷ 2.1 kg
Volume / Piston-operated volumetric apparatus – piston pipettes, piston burettes, dilutors, dispensers 10 µl ÷ 50 µl
50 µl ÷ 1000 µl
1000 µl ÷ 17000 µl		 0.027 µl
0.050 µl
0.410 µl
Volume / Capacity measures
(gravimetric method)		 1ml ÷ 5 ml
5 ml ÷ 10 ml
10 ml ÷ 25 ml
25 ml ÷ 100 ml
100 ml ÷ 200 ml
200 ml ÷ 500 ml
500 ml ÷ 1000 ml
1 l ÷ 10 l
10 l ÷ 20 l
20 l ÷ 50 l
50 l ÷ 200 l
200 l ÷ 500 l
500 l ÷ 1000 l
1000 l ÷ 2500 l
2500 l ÷ 50000 l		 0.0019 ml
0.0022 ml
0.0022 ml
0.0023 ml
0.0024 ml
0.0047 ml
0.080 ml
0.2 ml
0.37 ml
1.1 ml
4.2 ml
15 ml
42 ml
108 ml
659 ml
Volume / Capacity measures
(volumetric method)		 1 l ÷ 10 l
10 l ÷ 20 l
20 l ÷ 50 l
50 l ÷ 200 l
200 l ÷ 500 l
500 l ÷ 1000 l
1000 l ÷ 2500 l
2500 l ÷ 50000 l		 0.36 ml
0.75 ml
2.5 ml
4.8 ml
17 ml
42 ml
119 ml
440 ml
Volume / Liquid storage tanks (geometric method)
horizontal tanks
vertical tanks		 V ≤ 200 m3
V ≤ 60 000 m3		 0.031%
0.0041%
Volume / Liquid storage tanks (volumetric method)
horizontal tanks
vertical tanks		 V ≤ 60 000 m3 0.21%
Volume / Pipelines Dn (6 ÷ 2000) mm 0.006%
Volume / Fuel dispensers
Liquefied petroleum gas dispensers		 (2 ÷ 200) l/min
(5 ÷ 75) l/min		 0.08%
0.10%
Volume / Consumption meters for various liquid products, flow meters (1 – 3000) l/h
(3 – 60) m3/h
(3 – 300) m3/h		 0.04%
0.05%
0.14%
Volume / Gas meters (diaphragm)
G1.6 ÷ G25		 (0.016 ÷ 10) m3/h
(10 ÷ 40) m3/h		 0.08%
0.15%
Volume / Gas meters (rotary displacement and turbine)
G16 ÷ G4000		 (0.5 ÷ 6500) m3/h 0.26%
Volume / Gas volume conversion devices (0.5 ÷ 6500) m3/h 0.10%
Volume / Water meters (0.02÷20.00)m3/h 0.20%
Thermal energy / Heat meter (0.0001÷1.0) MWh
(0.02÷20.00)m3/h		 0.40%
Length, temperature / Automatic liquid level and temperature measuring system
length
temperature
mass calculation error
volume calculation error		 (0 ÷ 30) m
(-20 ÷ +85) °C
–
–		 1.4 mm
0.13 °C
0.07 %
0.03 %
Length / Micrometers (0 ÷ 100) mm,
resolut. 0.01mm
(0 ÷ 100) mm,
resolut. 0.001mm		 5.78µm + 1.62 · Lµm,
where L is in meters
0.60µm + 1.62 · Lµm,
where L is in meters
Length / Micrometer standards (0 ÷ 75) mm
(75 ÷ 100) mm		 2.2 µm
14.4 µm
Length / Gauge blocks (0 ÷ 75) mm
(75 ÷ 100) mm		 2.2 µm
14.4 µm
Length / Material measures of length Measuring tapes (0÷50)m
Measuring tapes with weight (0÷50)mMeters (0÷1)m Rules(0÷5)m

Dipsticks (0÷5)m

 (0.29 + 1.3 · 10-3· L) mm,
where L is in meters(0.24 + 1.3 · 10-3· L) mm,
where L is in meters

(0.29 + 1.3 · 10-3· L) mm,
where L is in meters
Length / Slide gauges (0 ÷ 400) mm,
resolut. 0.01mm
(0 ÷ 400) mm,
resolut. 0.02mm
(0 ÷ 400) mm,
resolut. 0.05mm
(0 ÷ 400) mm,
resolut. 0.1mm		 5.78µm + 1.62 · Lµm,
where L is in meters
11.54µm + 1.62 · Lµm,
where L is in meters
28.86µm + 1.62 · Lµm,
where L is in meters
57.74µm + 1.62 · Lµm,
where L is in meters
Degrees / Angle gauges (0 ÷ 180)° 24″
Degrees / Bevel protractors (0 ÷ 360)° 33″
Pressure / Vacuum gauges, pressure-vacuum gauges, technical, oxygen, electrocontact manometers (-0.08÷0) MPa
(0÷0.6) MPa
(0÷6) MPa
(0÷60) MPa		 0.23%
0.20%
0.19%
0.29%
Pressure / Electromechanical manometers (0÷2) MPa
(0÷7) MPa
(0 ÷ 30) MPa
(0 ÷ 60)MPa		 0.018 %
0.014 %
0.014 %
0.012 %
Pressure / Pressure transducers (0÷3) MPa
(0÷60) MPa		 0.016 mA
0.0024 mA
Pressure / Sphygmomanometers (0 ÷ 300) mmHg 0.58 mmHg
Direct voltage / Generation (multimeters, voltmeters, measuring clamps, direct voltage meters) 0 mV ÷ 200 mV
0.2 V ÷ 2 V
2 V ÷ 20 V
20 V ÷ 200 V
200 V ÷ 1000 V		 0.0029 mV
0.0000297 V
0.00008344 V
0.000814 V
0.0051 V
Alternating voltage (10 Hz ÷ 500 kHz) / Generation (multimeters, voltmeters, alternating voltage meters) 0 mV ÷ 200 mV
0.2 V ÷ 2 V
2 V ÷ 20 V
20 V ÷ 200 V
200 V ÷ 1000 V		 0.086 mV
0.000766 V
0.0065 V
0.131 V
0.607 V
Direct current / Generation (multimeters, ammeters, wattmeters, direct current meters) 0 µA ÷ 200 µA
0.2 mA ÷ 2 mA
2 mA ÷ 20 mA
20 mA ÷ 200 mA
0.2 A ÷ 2 A
2 A ÷ 30 A		 0.043 µA
0.00017 mA
0.000796 mA
0.0125 mA
0.00039 A
0.00449 A
Direct current / Generation (current clamps) 0 A ÷ 100 A
100 A ÷ 1500 A		 0.3076 A
0.395 A
Alternating current (10 Hz ÷ 10 kHz)/ Generation (multimeters, ammeters, alternating current meters) 0 µA – 200 µA
0.2 mA ÷ 2 mA
2 mA ÷ 20 mA
20 mA ÷ 200 mA
0.2 A ÷ 2 A
2 A ÷ 30 A		 0.333 µA
0.00129 mA
0.0114 mA
0.0123 mA
0.0024 A
0.0202 A
Alternating current (10 Hz ÷ 10 kHz)/ Generation (current clamps) 0 A ÷ 100 A
100 A ÷ 1500 A		 0.3077 A
0.395 A
Power (alternating voltage, 50 Hz ÷ 400Hz) / Generation (wattmeters) 0÷2A (0÷200V)
0÷2A (200÷1000V)
2÷30A (200÷1000V)		 0.434 W
3.99 W
19.24 W
Power (direct voltage) / Generation (wattmeters) 0÷2A (0÷200V)
0÷2A (200÷1000V)
2÷30A (200÷1000V)		 0.111 W
0.557 W
5.96 W
Resistance / Generation (ohmeters, multimeters, earth resistance meters, circuit testers, resistance meters) 0.01 Ω ÷ 0.1 Ω
0.1 Ω
1 Ω
10 Ω
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
1000 MΩ		 1.294 mΩ
0.075 mΩ
0.0034 Ω
0.00419 Ω
0.0078 Ω
0.0607 Ω
0.607 Ω
5.61 Ω
0.112 kΩ
0.003 MΩ
0.375 MΩ
10.272 MΩ
Resistance / Generation (megohmmeters) 100 kΩ
500 kΩ
1 MΩ
10 MΩ
100 MΩ
250 MΩ
400 MΩ
1 GΩ
10 GΩ		 0.08 kΩ
0.92 kΩ
0.0063 MΩ
0.0059 MΩ
0.09 MΩ
1.61 MΩ
2.51 MΩ
0.006 GΩ
0.045 GΩ
Capacity / Generation (multimeters, capacitance meters) 1 nF
10 nF
20 nF
50 nF
100 nF
1μF
10 μF
100 µF
1 mF
10 mF		 0.0025 nF
0.024 nF
0.048 nF
0.119 nF
0.24 nF
0.0037 µF
0.056 µF
0.566 µF
0.0098 mF
0.1 mF
Frequency / Generation (multimeters, hertz meters, frequency meters) 10 Hz
100 Hz
1 kHz
10 kHz
20 kHz
50 kHz
100 kHz
1 MHz
10 MHz		 0.000035 Hz
0.000035 Hz
0.0186 Hz
0.0189 Hz
0.0193 Hz
0.0273 Hz
0.0353 Hz
0.01866 kHz
0.0189 kHz
Resistance / Measurement (resistance boxes, calibrators, sources of electrical parameters) 0.1 Ω ÷ 100 Ω
0.1 kΩ ÷ 1 kΩ
1 kΩ ÷ 10 kΩ
10 kΩ ÷ 100 kΩ
0.1 MΩ ÷ 1 MΩ
1 MΩ ÷ 10 MΩ
10 MΩ ÷ 100 MΩ		 0.0004356 Ω
0.0134 kΩ
0.0001 kΩ
0.00101 kΩ
0.01 kΩ
0.0057 MΩ
0.6504 MΩ
Direct voltage / Measurement (calibrators, sources of electrical parameters) 0 ÷ 100 mV
100 mV ÷ 1 V
1 V ÷ 10 V
10 V ÷ 100 V
100 V ÷ 1000 V		 0.00511 mV
0.0000515 V
0.00145 V
0.0026 V
0.022 V
Alternating voltage (3 Hz ÷ 300 kHz) / Measurement (calibrators, sources of electrical parameters) 0 ÷ 100 mV
100 mV ÷ 1 V
1 V ÷ 10 V
10 V ÷ 100 V
100 V ÷ 750 V		 0.1422 mV
0.00121 V
0.0134 V
0.1621 V
0.79 V
Direct current / Measurement (calibrators, sources of electrical parameters) 0 ÷ 1 mA
1 ÷ 10 mA
10 ÷ 100 mA
0.1 ÷ 1 A
1 ÷ 10 A		 0.304 µA
1.738 µA
0.021 µA
0.474 mA
4.934 mA
Alternating current (3 Hz ÷ 300 kHz) / Measurement (calibrators, sources of electrical parameters) 0 ÷ 1 mA
1 ÷ 10 mA
10 ÷ 100 mA
0.1 ÷ 1 A
1 ÷ 10 A		 2.2 µA
0.021 mA
0.201 mA
2.809 mA
0.031 A
Frequency / Measurement (calibrators, sources of electrical parameters) 3 ÷ 10 Hz
10 ÷ 100 Hz
100 Hz ÷ 1 kHz
1 kHz ÷ 100 kHz
100 kHz ÷ 300 kHz		 0.0004 Hz
0.0006 Hz
0.03233 Hz
0.000589 kHz
0.03208 kHz
Temperature / Digital thermometers (-30 ÷ 1000)°C
resolution ≥ 0.01°C		 (0.024 ÷ 1.7)°C
Temperature / Liquid-in-glass, electrocontact liquid-in-glass thermometers (-30 ÷ 260)°C
resolution ≥ 0.1°C		 (0.022 ÷ 0.06)°C
Temperature / Manometric, bimetallic thermometers (-30 ÷ 600)°C
resolution ≥ 0.5°C		 (0.29 ÷ 0.58)°C
Temperature / Resistance thermometers (-30 ÷ 650)°C (0.026 ÷ 0.2)°C
Temperature / Infrared (distance) thermometers, thermographic cameras (-30 ÷ 150)°C 0.42°C
Temperature / Temperature transducers (-30 ÷ 1000)°C
resolution 0.01°C		 (0.005 ÷ 0.019) mA
Humidity / Hygrometers (30 ÷ 100) %RM 2.2 %RM
Torsional moment / Torque wrenches (2 ÷ 100) Nm
(25 ÷ 1100) Nm		 0.23%
0.10%
Force / Dynamometers (0 ÷ 300) kN 0.30%
Explosive and other gas concentrations analyzers, detectors (0 ÷ 100) % ZSR
(0 ÷ 5000) ppm
CO, NO, CO2, SO2, CH4, C4H10, H2, H2S, O2, C3H8		 2 % relative
Flue gas analyzers (0 ÷ 100) tilp %
(0 ÷ 5000) ppm
CO, NO, CO2, SO2, O2		 2 % relative
Temperature / Calibration of temperature of thermostats, ovens, drying cabinets (-30 ÷ 600)°C
resolution < 0.1°C
(-30 ÷ 1000)°C
resolution ≥ 0.1°C		 0.023°C
(0.12 ÷ 1.206)°C
Length / Ultrasound thickness gauges (thickness – steel) (2 ÷ 200) mm (0.032 ÷ 0.070) mm
Length / Coating thickness gauges (49 ÷ 806) µm (1.45 ÷ 1.99) µm
Length / Sieves (500 ÷ 1000) µm
(1 ÷ 125) mm		 0.0016 mm
(0.0059 ÷ 0.077) mm
Length / Thread plug gauge Pitch diameter
(0 ÷ 75) mm
(75 ÷ 100) mm
Major diameter
(0 ÷ 75) mm
(75 ÷ 100) mm		 2 µm
11 µm
2 µm
11 µm
Hydrogen ion concentration / pH meters
Oxidation-reduction potential / ORP meters		 (0 ÷ 14.00) pH
(-2000 ÷ 2000) mV
(-2000 ÷ 2000) mV		 (0.0447 ÷ 0.1) pH
(0.033 ÷ 0.0794) mV
Conductivity in a solution / Conductivity meters (0 ÷ 199.9) mS/cm (1.442 ÷ 5.735) µS/cm
Length / Laser distance meter (0 ÷ 250) m 0.319 mm
Rotation speed / Optical tachometers (60 ÷ 60 000) rpm (0.1 ÷ 1 ) rpm
Rotation speed / Centrifuges (10 ÷ 100) rpm
(100 ÷ 1000) rpm
(1000 ÷ 60000) rpm		 (0.068 ÷ 0.199) rpm
(0.068 ÷ 0.093) rpm
(0.093 ÷ 3.268) rpm
Oscilloscopes (oscillographs) (0.01 ÷ 100) MHz
(0 ÷ 1000) V RMS		 1.9553 nHz ÷12.858 Hz
(0.0012 ÷ 0.607) V RMS
Light/ Luxmeters (0÷2000) lx (0,059÷21) lx
Sound/ Sound level meters 94 dB, 104 db, 114 dB
(1 kHz)		 0,18 dB

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