Fluke FOM Manuale utente

FOM, FOS 850, FOS 1300, FOS 850/1300

Fiber Optic Power Meter

Fiber Optic Light Source

Instruction Sheet

Introduction

The Fiber Optic Power Meter (FOM) measures optical power on

fiber optic cables. An FOM indicates any power loss on tested

cables using any digital multimeter (DMM) or graphical

multimeter (GMM) that has a 10 MΩinput impedance, standard

diameter banana jacks, and mVdc capability. The Fiber Optic

Light Source (FOS) is used as a light source with the FOM or

other fiber optic meters.

Safety Information

All FOSs have been tested according to IEC 1010-1 and

IEC 825-1 and meet all requirements for a Class 1 LED Product.

To ensure the FOS is used safely, read the following warnings:

PWarning P

To avoid possible exposure to hazardous invisible LED

radiation and to prevent eye damage:

•Never look directly into the aperture (Figure 2) of the ST

connector.

•Do not open the case; no serviceable parts are inside.

Send the source to a authorized service center for

calibration or repair.

•Do not adjust or modify the source; LED sources may

exceed Class 1.

•Do not use magnification at the ST connector output.

•Caution - Use of controls or adjustments, or performance

of procedures other than those specified herein may

result in hazardous radiation exposure.

PN 200631 May 1996 Rev. 2, 2/97

Fluke Networks DSP-FTK Specs

Provided by www.AAATesters.com

FOM Features

FOM

FIBER

OPTIC

METER

1550

1300

850

OFF

DMM Plugs

Battery Indicator LED

Function Switch

Input Connector (ST)

aj1f.eps

Figure 1. Fiber Optic Power Meter

FOS Features

FOS 850

FIBER

OPTIC

SOURCE

850

OFF

Battery Indicator LED

Function Switch

Output Aperture

Connector (ST)

aj2f.eps

Figure 2. Fiber Optic Light Source (850 Source Shown)

Clean Connectors

Turn the FOS off before cleaning. To ensure proper operation,

clean internal portion of connectors with a low-lint optical grade

cleaning swab and optical grade alcohol, and a can of filtered

compressed air.

Measuring dB Loss

To measure dB loss, refer to Figures 3 and 4 and do the

following:

Receive

Cable

Launch

Cable

aj3f.eps

Figure 3. Measuring Output for Source Reference

1. Clean the connectors and fiber ends with alcohol and check

for fiber bends. Connect the receive cable to the FOM and

the launch cable to the FOS.

2. Connect the launch and receive cables with a coupling

(P/N 602810 or equivalent).

3. Plug the FOM into the DMM or GMM with the red polarity

indicator aligning with the voltage input.

4. Select mVdc on the DMM.

5. Select the desired wavelength on the FOM.

6. Select the desired wavelength on the FOS and stabilize (20

minutes).

7. Record the dBm reference measurement (1 dBm = 1 mVdc)

on the DMM display (or if you have a DMM with a reference

function, activate the reference function).

Note

The reference measurement on the display should

closely match the output level specified for the optical

source (approximately -20 dBm into multimode fiber).

8. When finished, disconnect the launch and receive cables

from the coupling.

Note

To measure dB loss accurately, do not disturb the

connections to the FOM and FOS after measuring the

source output.

Receive

Cable

Patch

Panel

Cable

Under

Test

Launch

Cable

FOM

FOS

aj4f.eps

Figure 4. Measuring Optical Loss

9. Connect the launch and receive cables to cable under test;

record the measurement. (Cables must be the same fiber

type as the cable under test.)

10. Subtract the optical loss measurement from the dBm

reference measurement to get the actual dB loss. (If the

DMM has an activated reference function, the reading is dB

loss.)

Checking the Battery

If the LED is on continuously, the battery is good.

If the LED blinks or is not on, replace the battery.

Replacing the Battery

To replace the battery, refer to Figure 5.

aj5f.eps

Figure 5. Battery Replacement

General Specifications

Power Meter Specifications

Output: 1 mV per 1 dB

Input Connector Type: Fixed ST

Photodetector Type: Germanium

Application Range: 800 to 1600 nm

Calibrated wavelengths: 850, 1300, and 1550 nm

Acceptable fiber types

(sizes): 9/125 to 100/140 µm

Operating range: +3 to -50 dBm

Maximum power level: +5 dBm

Absolute accuracy: ±0.25 dB, (Specified at 25°C &

-10.0 dBm per NIST standard)

Relative accuracy: ±0.15 dB, (Specified over any 10 dB

within measurement range)

Repeatability: ±0.04 dB

Battery type: 9V alkaline, NEDA 1604A or IEC 6LR61

Battery life: 16 hours minimum, 100 hours typical, 9V

alkaline

Low battery indication: Blinking LED indicator

Operating temperature: 0 to +40°C

Storage temperature: -20 to +70°C

Humidity: 0 to 40°C, up to 75% RH

Electromagnetic

Compatibility:

RF Field ≤1 V/m

RF Field = 3 V/m

Total Accuracy =

Specified Accuracy

Specified Accuracy + 2.5 dB

Source (850, 1300, 850/1300) Specifications

Type: Infrared LED

Wavelength: 850 ± 30 nm

1300 ± -40/+50 nm

850/1300 ± 30 nm, -40/+50 nm

Output power: -20 dBm, nominal into 62.5/125 micron

multimode fiber

Output connector type: Fixed ST

Beam divergence: 0.3 radians

Pulse duration: Continuous wave

Maximum output: 200 µW (radiated into free space)

Stability: ±0.2 dB per 8 hours at 20°C after 20

minute warmup

Temperature coefficient: -0.08 dB per °C, < 18°C or > 28°C

Battery type: 9V alkaline, NEDA 1604A or IEC 6LR61

Battery life: 16 hours minimum, 24 hours typical, 9V

alkaline

Low battery indication: Blinking LED indicator

Operating temperature: 0 to +40°C

Storage temperature: -20 to +70°C

Humidity: 0 to 40°C, up to 75% RH

Service

For service information in the U.S.A., call 1-800-825-9810.

Outside the U.S.A., contact an authorized service center.

To locate an authorized service center, visit us on the World

Wide Web: www.fluke.com or call Fluke using any of the phone

numbers listed below:

1-800-443-5853 in U.S.A and Canada

31 40 267 8200 in Europe

206-356-5500 from other countries

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