YOKOGAWA 51011, User Manual

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IM 51011-01EN
28
9. Light Source Luminous Intensity (cd Key)
This function is available on Model 51021.
If the light source can be regarded as a single, single-point light
source, you can set the distance from the light source to the
measuring point and make the meter calculate and display the
luminous intensity.
Luminous intensity (cd) = illuminance (lx) × distance (m)
2
Set the distance to the measuring light source in advance.
Setting the Distance
1.
Press
SET
and then
cd
. [SET, m] appears.
2.
Press and to enter the distance from the light source under
measurement to the reference plane of the lux meter.
The range is 00.00 to 99.99 m. (In unit of meter)
3.
Press
SET
.
[SET, m] disappears, and the setting is complete.
Measuring
1.
Press
cd
. [cd] appears.
2.
Face the light-detecting surface of the lux meter towards the
light source. Take a measurement at the specified distance.
To view the distance that you have specified, hold down CALL .
3.
Read the value.
4.
To return to normal measurement, press cd . [cd] disappears.