TB 9-6625-2309-35
NOTE
Ensure TI display indicates 2-Point Loss and not LSA/2 PT
Loss: If TI display indicates the latter, change by pressing
second unmarked softkey from top.
(b) Press REAL TIME pushbutton, if necessary, to turn LASER on.
(23) Adjust FOCUS-SWCM VAR ATTN 1 control for a 2-point loss indication on TI
display of +4.0 0.1 dB.
(24) Press FAST SCAN pushbutton and wait for displayed LASER ON/AVG and
WORKING indications to go off indicating completion of data acquisition.
(25) Record 2-point loss value displayed on TI in Power High column on TD-260C
(850 nm) Attenuation Data Sheet (appendix A).
(26) Position FOCUS-SWCM SWITCHED ATTN switch to IN.
(27) Press TI FAST SCAN pushbutton and wait for LASER ON/AVG and
WORKING on TI display to go off.
(28) Record 2-point loss value displayed on TI in Power Low column on TD-260C (850
nm) Attenuation Data Sheet (appendix A).
(29) Set FOCUS-SWCM SWITCHED ATTN switch to OUT.
(30) Press REAL TIME pushbutton.
(31) Adjust FOCUS-SWCM VAR ATTN 1 control for a 2-point loss value on TI
display of 0.2 dB less than last `Power Low' value previously recorded on attenuation data
sheet.
Example:
Last `Power Low' level = 7.00 dB. Adjust 2-point loss to approximately 6.8 dB.
(32) Press FAST SCAN pushbutton and wait for LASER ON/AVG and WORKING
on display to go off.
(33) Record 2-point loss value as next Power High column entry on TD-260C (850 nm)
Attenuation Data Sheet.
(34) Set FOCUS-SWCM SWITCHED ATTN to IN.
(35) Press TI FAST SCAN pushbutton and wait for TI LASER ON/AVG and
WORKING indications to go off.
(36) Record 2-point loss value as next entry in Power Low column on TD-260C (850 nm)
Attenuation Data Sheet (appendix A).
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