Technique of measurement of light exposure by luxmetre

Luxmetre U-116 consists of the selenic photo cell with filters-nozzles and galvanometer with a scale. The photo cell works under the influence of light, developing an electric current which force measure by the galvanometer. Its arrow specifies number of lux that answers investigated light exposure.

On the panel of the measuring device buttons of the switch and the tablet with the scheme which connects action of buttons and a nozzle with various ranges of measurements are established. The device has two graduated scales, in lux: 0-100 and 0-30. On each scale points specify the beginning of a range of measurements: on a scale 0 - 100 point is over a label 20, on a scale 0-30 over a label 5. Also there is a proof-reader for an arrow establishment on zero position which is regulated by a screw-driver.

The selenic photo cell which joins the device by means of a plug, is in the plastic case. For the purpose of error reduction use a spherical nozzle on a photo cell, made of the white light-scattering plastic, designated on an inside, and an opaque ring. This nozzle is applied in parallel from one of three other nozzles-filters, which have factors of easing of light, equal accordingly 10, 100, 1000, that expands ranges of measurements. Without nozzles, luxmetre is possible to measure light exposure within 0-30 and 0-100 lux.

In the course of measurement an arrow of the device establish on zero division of a scale, then opposite to the pressed button define the greatest value of a range of measurement chosen by means of nozzles. By button pressing opposite to which the greatest value of a range of measurements is written, multiple 10, it is necessary to use for readout by indications of the scale 0-100, by button pressing, on against which are put value of a range, multiple 3, indications of the scale 0-30. The Instrument reading in divisions on corresponding scale multiply by factor of easing which is designated on a corresponding nozzle. The general estimation of natural illumination of premises carried out on a basis of comparison all complex of the measured indicators with hygienic specifications (table 1).

Table 1

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