Testboy TV 335, Руководство по эксплуатации

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Operation
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TV 335
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Information about the correct light intensity
The intensity of light is measured in Lux. The adaptation capability of the human eye is practically
unrestricted. This can result in that the eye requires major visual performance also if the lighting
is insufficient. If there is no, or insufficient light present, the eye can only fulfil its viewing tasks by
straining, or possibly not at all. Affliction to the eyes is often the result. Accidents become more
frequent.
Using the digital luxmeter Testboy TV 335, you now have acquired a product with which to check
everywhere, whether sufficient light intensities are actually available for the normal viewing tasks
that are carried out daily. Seeing is the detection of the difference between brightness and col-
ours, shapes, movement and distances. Only with the correct intensity of light can the eye fulfil its
tasks. Therefore, good light is important.
Saving is often incorrectly made with light. Dark zones attune to being unfriendly. Allow more
light. The type of lighting influences the information that the eye transmits to the brain. Direct
more light to there where accurate vision is important. There is a risk of an accident in rooms that
are darker than 30 Lux! Older persons require more light because their visual acuity has reduced.
A 60 year old person requires approximately twice the amount of light as a 30 year old.
Carrying out measurements
Before commissioning, observe the intended use as well as the safety instructions and
technical data.
Use the On/Off switch to switch on the instrument.
Remove the protective cap from the light sensor and align this so that the light strikes the light sensor,
aligned horizontally, vertically. Thereby, prevent shading the light sensor by your own body.
Once the measurement is complete, switch off the instrument (On/Off switch) and install the pro-
tective cap on the sensor.
Measurement range (manual / automatic)
After switching on the instrument, the measurement device is always in the automatic measure-
ment range. By pressing the button “RAN”, the measurement range switches to manual.
By again pressing the pushbutton, the measurement range and the decimal point (20.00; 200.0;
2000; 20.000; 200.000) changes. If the measurement value is outside the measurement range,
“OL” appears on the display. Keep the button “WRAN” pressed until the corresponding manual
measurement range is set, or until “AUTO” appears on the display and the automatic measure-
ment range is reset.
Relative measurement
After switching on the instrument, the relative measurement can be activated by pressing the but-
ton “REL/PEAK”. The value last indicated is set as the reference value and now indicates the dif-
ferential values to the reference value set. The relative measurement can be carried out in the a u-
tomatic and manual measurement range. This function can be deactivated by pressing the button
“REL/PEAK” for a longer period.