FOS-850/1300 FLUKE NETWORKS, FOS-850/1300 Datasheet - Page 4

• Manufacturer Part Number: FOS-850/1300
• Description: FIBER OPTIC METER
• Manufacturer: FLUKE NETWORKS

Specifications of FOS-850/1300

• Connector Type: Fixed ST
• Operating Temperature Range: 0°C To +40°C
• Lead Free Status / RoHS Status: na

FOM/FOS
Service Information
3. Tuck the battery wires down against the pca so
4. Set SW1 to the off position.
5. Set the slide switch actuator on the top case to
6. Put the top and bottom cases together; then
Calibration Adjustments for the
FOM
To ensure that the FOM performs to specifications,
calibrate it annually using the procedure that
follows.
Always perform the complete calibration
adjustment procedure.
Preparing for Calibration
To prepare for calibration, proceed as follows:
1. Remove the dust cap from the FOM.
2. Connect a voltage supply of 8V ±1.0V dc to the
3. Set the FOM switch to the 1300 nm position.
4. Allow all sources to warm up according to the
Coarse Calibration Adjustment
Refer to the FOM drawing (Figure 1) for the
locations of measurements and components.
1. Connect the 1300 nm light source to the
4
they will not interfere with SW1.
the OFF position. For the FOS, place the
lanyard into the notch in the bottom case.
replace the two screws under the battery door.
FOM battery strap.
Allow the FOM to warm up for 10 minutes.
manufacturer’s specifications.
attenuator input.
Connect the attenuator output to the reference
power meter. Set the attenuator for 0 dB
attenuation. Set the 1300 nm light source for a
power meter reading of -10 ± 0.05 dBm.
2. Connect the attenuator output to the FOM.
3. Measure V det between U1 pin 7 and the analog
4. Adjust R2 for an output on the DMM of 0.23
1300 nm Fine Calibration Adjustment
1. Connect the 1300 nm light source to the
2. Connect the attenuator output to the FOM.
3. Adjust R10 for an output on the DMM of P o
4. Connect the attenuator output to the reference
5. Connect the attenuator output to the FOM.
6. Adjust R2 for an output on the DMM of P o
7. Repeat steps 1 through 6 until the FOM’s -10
8. Apply insulating varnish, such as red GLPT, to
For the remaining calibration adjustments,
use the cable that was used in step 1 for
connecting the attenuator to the reference
power meter or the FOM. To reduce errors,
limit the movement of the cable when making
connections between the attenuator and the
reference power meter or the FOM. To limit
cable movement, coil and tape the excess
cable to the work surface.
ground reference at U1 pin 5 with the DMM.
(See Figure 1.)
attenuator input. Connect the attenuator output
to the reference power meter. Set the attenuator
for 0 dB attenuation. Set the 1300 nm light
source for a power meter reading of -10 ±0.05
dBm.
Record this reading as P o to use in step 3.
Connect the FOM to the DMM.
±0.05 dBm.
power meter. Set the attenuator for a power
meter reading of -45 ±0.05 dBm.
Record this reading as P o to use in step 6.
±0.05 dBm.
dBm and -45 dBm readings are within
specifications.
the R10 and R2 potentiometers.
0.01V dc.
Note