Chapter 6
Adjustment and Verification
Focus 30/35 Service Manual 6 - 76 P/N 79000035_SM, Version 1.5
TCXO frequency calibration (Level 4 operation)
Frequency counter with the following specification is strong required:
Range : 100Hz - 300 MHz
Uncertainty: <1x
10
-7
at (23 3)°C / per year
Resolution: 10 digits, max. 0,1mHz
e.g. Fluke PM6685/-5- with OCXO
Tools and equipment
5 Adjust Receiver fibre
position to APD.
A. Turn the left screw
carefully in and out
to maximize the
value
Signal ext/int.
B. Turn the right screw
carefully to
maximize value
Signal ext/int.
C. Repeat action
A and
B until the value is
maximized.
D. Lock screws at the
red marked dots.
0,7mm Allen key.
Note – Find the
maximum signal!
Tolerances for
reference signal
adjustment only.
Glue MS 1855
Fig. 6-62 Align receiver fibre position to APD
6 Adjust reference fibre. See “Reference fibre
adjustment” on page 6-64.
7 Exit software. A. Remove Scattered
light device with
adapter ring.
B. Click
Exit.
Description Part number
Frequency counter as specified Local
Item Performance Action Result Notes
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