Hitachi Hidic EH-150 EH-OLNK Applications Manual page 38

Appendix Optical Cable
[2] Measure the optical cable ( Standard length: 1 to 2 m )
A
[3] Measurement of optical cable of measurement target
Receive side
Receive side
1) A
2) B
( loss level of repeater adapter --- ≤ 2 dBm)
[4] Judgment of measurement result
1) A B loss of target optical cable =
2) B A loss of target optical cable =
It is judged that it is good if the loss of each target optical cable is within 12dBm.
But, the loss of the optical cable is the rate of 12dBm/km. Confirm whether it is the loss level which
corresponded with the distance, too.
imple method
[5] S
A standard optical cable to use with the process 1) is measured as less than 1m.
In the process 3), A standard cable isn't connected, and it is measured only with the target optical cable.
It is judged if a loss is within 12dBm.
W
RANGE
660
Fig. A.1 Arrange of the switch for optical meter setting
Standard optical cable
A A
Standard optical
cable
A
Optical cable of
measurement target
B measurement target level
A measurement target level
(A B Standard measurement level)–(A
(B A Standard measurement level)–(B
dBm
X
HOLD
780 820
B
measurement target
Repeater adapter
Repeater adapter
A - 4
REF
850 nm
X
A B Standard measurement level
( A Translate，B Receive )
B A Standard measurement level
( A Receive，B Translate )
Optical cable of
Transmission side
Standard optical
cable
Transmission side
B Target measurement level)
A Target measurement level)
B
B