15
3
Open the slide cover and press the [SET] key.
The reference value which has been held will blink.
z
To cancel the reference value, press the [CALL] key.
4
Press the [SET] key again.
The reference value will be set, and “± 0 lx” or “100.0 %” will appear.
z
To check the reference value, press the [CALL] key. The reference value will be displayed
while the
[
CALL] key is held down.
k
Entering the desired reference value numerically
1
Operate the instrument as described in “Measuring the illu-
minance” (page 13). Make sure that the hold button is pushed
out (RUN).
2
Press the [⊿] key.
The mode will switch to illuminance difference/ratio measurement mode.
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