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5 Type approval of the measuring instrument
5.1 General
The type approval process is made up of the following tests:

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  external inspection,
  
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  preliminary function test,
  
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  accuracy test,
  
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  linearity test,
  
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  relative spectral responsivity test,
  
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  test of sensitivity to UV and infrared radiation,
  
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  temperature dependence test,
  
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  directional dependence test,
  
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  test of resistance to external effects:
  
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  test of resistance to boundary temperatures for storage and transportation,
  
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  test of protection from water seepage and infiltration by foreign particles (degree of protection offered by the cover);
  
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  electromagnetic compatibility tests:
  
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  test of resistance to radiated high-frequency electromagnetic fields,
  
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  test of resistance to electrostatic discharge.
  

5.2 External inspection
The external inspection of the lux metre assesses the following:

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  the completeness of the required technical documentation,
  
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  conformity of the metrological and technical characteristics specified by the manufacturer in the documentation with the requirements of this regulation, specified in Articles 2, 3 and 4;
  
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  the completeness and condition of the lux metre according to the specified technical documentation,
  
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  conformity of the lux metre’s software version with the version specified by the manufacturer.
  

5.3 Preliminary function test
The device must be placed in a temperature stabilised laboratory (at 25 ± 2) °C for a sufficient length of time for its temperature to adjust before measuring commences.
The photoelectric transducer is mounted firmly to a holder at the optical zero of the photometric bench and the display unit is placed in the prescribed position.
A cursory check of the lux metre’s functioning is conducted in an undarkened photometric laboratory by measuring a light background in the laboratory environment.
After the photometric laboratory has been darkened, the device’s zero deviation is checked (and set, if necessary), if the lux metre so allows.