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DSP-FOM
Fiber Optic Meter
Step 5: 1550 nm Fine Calibration
Adjustment
5-1. Set the switch on the FOM to the 1550 nm
position.
5-2. Set the 1550 nm light source to -10 dBm
±0.05 dBm. Use the reference power meter to
measure the source output power level.
Record this level as P in for use in step 5-4.
5-3. Connect the 1550 nm light source to the
FOM.
5-4. Use P in from step 5-2, V ref from step
2-5, and the transfer function below to
calculate Vo:
9R =
V
ref
53 dBm
5-5. Measure between DBout at U2 pin 7 and the
analog ground reference at U1 Pin 4. Adjust
R3 for Vo (as calculated in step 5-4)
±0.0005 V.
Step 6: Verifying Calibration
6-1. Follow the procedures given in the earlier
section "Performance Tests".
6-2. Apply insulating varnish, such as red GLPT,
to R1, R2, R3, and R10.
6-3. Reassemble the FOM as described in the
earlier section "Disassembling and
Reassembling the FOM".
6
(
)
( )
× −
+
P
3 dBm
in
Parts and Accessories
Replacement parts (Table 2) and accessories
(Table 3) are available from Fluke.
Table 2. Fluke Replacement Parts for the DSP-FOM
Description
DSP-FOM Plastic Case Assembly
Battery Door
PD1: Germanium Photodiode, 1 mm
Table 3. Accessories for the DSP-FOM
Description
ST to ST Multimode Patch Cable, 1m
ST to ST Cable Adapter
Carrying Case
Fluke Part
Number
616034
200474
602778
Fluke Part
Number
617453
602810
616091
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