11
8
8
.
.
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
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 marked on the faceplate, 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 and the operational time. The
calibration accuracy may be enhanced by refitting the
sensor cover cap when the instrument is not in use. In
order to maintain the basic accuracy of the instrument,
periodic calibration is recommended.
9
9
.
.
R
R
E
E
C
C
O
O
M
M
M
M
E
E
N
N
D
D
E
E
D
D
I
I
L
L
L
L
U
U
M
M
I
I
N
N
A
A
T
T
I
I
O
O
N
N
L
L
E
E
V
V
E
E
L
L
S
S
(1fc = 10.76 lux)
LOCATIONS
lux
fc
•
OFFICE
Conference, Reception room.
200 ~ 750
18 ~ 70
Clerical work
700 ~ 1,500
65 ~ 140
Typing & drafting
1000 ~ 2,000
93 ~ 186
