YOKOGAWA 51001, Руководство пользователя

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totalized intensity of illumination and/or the comparator function is being
executed, this function is automatically disabled; thus, it does not function.
The function can be disabled permanently if not necessary (if the meter is
used continuously). Refer to the operation procedure described in “Illumi-
nance Measurement.” Whenever this function is operable, [AUTO
POWER OFF] appears in the display area.
Notice on Making Measurements
1. Before starting measurement, as a rule, turn on the bulb five minutes
beforehand and the discharge lamp 30 minutes.
2. Set the position and angle of the light-detecting surface accurately.
Figure 5 shows the measuring reference plane.
Measuring reference plane
Figure 5. Measuring Reference Plane
3. Exercise care that your position or clothes do not affect illuminance
measurement.
4. In the case of accurate illuminance measurement, multiply the measured
value by the color correction factor corresponding to the spectral
distribution of the measuring light source and the factor corresponding to
the relative spectral response of this illuminance meter, respectively.
This meter provides a color correction factor function which is set to a
typical light source. The color correction factor multiplied by the
measured value is indicated automatically.
5. The zero point may vary if the ambient temperature varies greatly over
long-time meter use. In such a case, turn off the power once and then
turn it on again (see “Illuminance Measurement”).