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7. RELATIVELY MEASURING
After turning on the device, press the "REL" button to
activate the relative measurement. The last displayed value
will be set to the reference value, which now shows the
difference from the set reference value. Relative
measurements can be made either within the automatic
measurement range or within the manual measurement
range. Press the "REL" button again to deactivate this
feature.
LUX
Default range setting is AUTO with the device
switched on.
8. UNITS OF MEASURE
a.Illuminance unit: The measured values can be
displayed in Lux and FC (foot-candles) by pressing
"LUX/△" and "Fc/▽", respectively.
LUX/
LUX FC
AUTO
b.Temperature unit: Switch the device to ºC or ºF mode,
and read the ambient temperature value on the LCD.
C
FC/
C
7
LUX FC
C / F
C
AUTO
9. DATA HOLD FUNCTION
Press the "HOLD" key to lock display value, and the "H"
sign will appear on the display, press it again to exit.
HOLD
BATTERY CHECK-UP & REPLACEMENT:
1. After turning off the meter, press the battery cover and
push in the direction of the arrow to open.
2. Disconnect the batteries from the instrument and replace
it with a standard 9-volt transistor battery and go for the
cover.
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.
LUX FC
F
AUTO
LUX FC
C
8
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