TB 9-6625-2291-24
(5) Connect biconic end of optical fiber jumper cable to lightwave multimeter
OPTICAL INPUT port and FC end to FOCUS-LWCM OPTICAL I-O.
(6) Set FOCUS-LWCM output for 1310.0 nm and -20.00 dBm.
(7) Record lightwave multimeter indication to within 0.01 dBm.
(8) Carefully remove optical fiber jumper cable connection from lightwave
multimeter OPTICAL INPUT port and connect to RECEIVE port.
(9) If TI does not indicate within 0.5 dBm of value recorded in (7) above, perform
b(1) and (2) below.
(10) Carefully remove optical fiber jumper cable connection from RECEIVE port and
connect to lightwave multimeter OPTICAL INPUT port.
(11) Set FOCUS-LWCM output for -40.00 dBm.
(12) Measure and record lightwave multimeter indication to within 0.01 dBm.
(13) Carefully remove optical fiber jumper cable connection from lightwave
multimeter OPTICAL INPUT port and connect to RECEIVE port.
(14) If TI does not indicate within 0.59 dBm of value recorded in (12) above, perform
b(3) and (4) below.
(15) Carefully remove optical fiber jumper cable connection from RECEIVE port and
connect to lightwave multimeter OPTICAL INPUT port.
(16) Set FOCUS-LWCM output for lightwave multimeter indication of -10 dBm.
Record indication within 0.01 dBm.
(17) Carefully remove optical fiber jumper cable connection from lightwave
multimeter OPTICAL INPUT to RECEIVE port. TI will indicate value recorded in (16)
above 0.59 dBm.
(18) Use technique of (15) through (17) above for FOCUS-LWCM settings of -30 and
-50 dBm. TI will indicate within 0.59 of recorded value.
b. Adjustments
(1) Connect multimeter HI to U3 pin 34 and LO to pin 21, adjust A2R9 (fig. 1) for
multimeter indication of 1.000 V dc and then disconnect multimeter (R).
NOTE
A2R43 and A2R3 adjustments interact.
(2) Adjust A2R43 (fig. 1) for a TI indication equal to recorded value in a (7) above
0.01 dBm (R).
(3) Adjust A2R3 (fig. 1) for a TI indication equal to recorded value in a (12) above
0.01 dBm (R).
(4) Repeat a (5) through (14) above as necessary until within tolerance conditions
are met.
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