OP930D Functionality
AN-105
805.987.1700
sales@optotest.com
engineering@optotest.com
2
OptoTest Corp.
4750 Calle Quetzal
Camarillo, CA 93012
Doc: AN-105 Rev.B 12/13 /13
For duplex measurements using the OP930D, connect two reference cables to the corresponding source channel,
and then connect the reference connectors to their corresponding OPM channel.
Insertion Loss Reference
Figure 2: A reference setup for duplex cable measurement
Figure 3: A duplex return loss reference setup
Cables terminated with a PC polished connector exhibit the inherent 4% reflection (~14dB). This is the ideal
situation for taking the reference. A clean connector interface on both ends, the APC connection at the front panel
of the instrument, and the PC interface of the reference cable are all necessary.
Reference return loss by leaving the PC endface of an APC-PC launch cable unmated. Navigate to the RL screen for
the first channel by pressing the right arrow button twice from the OPM screen. With the launch cable connected
to the front panel, press and hold Ref to begin a return loss reference. Repeat this process for the second set. For
methods of testing APC-APC reference cables, please consult AN-114 RL Testing for APC Cables.
Return Loss Reference
dB
Dual IL /RL Test Set
dBm
Ref
OP930D
IL
1310
nm
dB
Source
0.00
1550 nm
1310 nm
Detector
dB
0.00
-2.42
-1.72
dBm
dBm
Dual IL /RL Test Set
dBm
Ref
OP930D
RL
1310
nm
dB
Source
14.00
1550 nm
1310 nm
Detector
01
CH
POS 3.3m
77.3 F
minimal length is 3 meters
PC
APC
APC
SAVer**
HPR*
*HPR High Performance Cable
** SAVer Cable
APC
APC
HPR*
HPR*
SAVer**
SAVer**
APC PC
PC
APC
HPR*
PC
SAVer**
APC
APC
