Elma Instruments 1335 Bedienungsanleitung Seite 22

9. Relative reading mode: Press ∆REL key to enter Relative mode. The display shown
zero value and the current reading will be stored as a zero-in value. Press again to
exit this mode.
10. When the measurement is completed, replace the photo detector cap and turn the
meter off.
VI Battery Check-Up & Replacement
1. As the battery power is not sufficient, LCD will display "BT"; and, replacement of
one new batterie type 6×1.5V is required.
2. After turning off the meter, press the battery cover and push in the direction of the
arrow to open.
3. Disconnect the battery from the instrument and replace it with a standard 6×1.5V
battery and go for the cover.
VII Spectral Sensitivity Characteristic
To the detector, the applied photo diode with filters makes the spectral sensitivity
•
characteristic almost meet C.I.E. (INTERNATIONAL COMMISSION ON
ILLUMINATION) photopic curve V(λ) as the following chart described.
VIII Maintenance
1. The white plastic disc on the top of the detector should be cleaned with a damp
cloth when necessary.
2. Do not store the instrument where temperature or humidity is excessively high.
3. The reference level, as marker on the face plate, is the tip of the photo detector
globe.
4. The calibration interval for the photo detector will vary according to operational
conditions, but generally the sensitivity decreases in direct proportion to the product
of luminous intensity by the operational time. In order to maintain the basic accuracy
of the instrument, periodic calibration is recommended.
Elma 1335
1.2
1
0.8
0.6
0.4
0.2
0
Wavelength in Nonometers
1.2
1
0.8
Light Meter
0.6
CIE
0.4
0.2
0
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