1

FPM 101 Function ButtonsPower

This button provides two functions:

z Press and hold to turn the power meter on. The meter turns off after five minutes of inactivity.

z With the power meter on, press and hold to disable or enable the auto off feature.

Wavelength/Backlight This button provides two functions:

z Press and release to manually cycle through the calibrated wavelengths in the following order: 850 nm > 1300 nm > 1310 nm > 1490 nm > 1550 nm > 850 nm ...

NOTE: When the power meter is receiving a wavelength ID indication (WAVE ID) from the FLS 101 light source, it automatically switches to the WAVE ID wavelength.

z With the power meter on, press and hold to toggle the backlight on or off.

dB/dBm/µWThis button provides two functions:

z Press and release to toggle display readings between insertion loss (dB) and power (dBm).

z Press and hold to view power in microwatts (µW).

Ref/SetThis button provides two functions:

z Press and release to display the stored reference level for the currently selected wavelength or the stored reference levels for multiple wavelengths.

z Press and hold until HELD SET is displayed to store the currently measured level, or multiple levels, as the new reference.

This guide provides instructions for an experienced technician to begin using the Extron Fiber Optic Power Meter (FPM 101) and Light Source (FLS 101).

The Extron Fiber Optic Test Set includes all the tools needed to measure optical power and cable loss in multimode (MM) and singlemode (SM) fiber optic AV equipment and fiber optic cabling. The light source includes both a multimode LED output that operates at 850 nanometers (nm) and 1300 nm, and a singlemode laser output that operates at 1310 nm and 1550 nm. The power meter is compatible with both multimode and singlemode fiber and measures optical power in dBm or microwatts (µW) and insertion loss in dB.

µW

POWER

Fiber Optic Test Set • Setup Guide

FPM/FLS 101 • Quick Start Guide (Continued)

2

FPM 101 Display ReadingsThe following table lists the display readings for the FPM 101 power meter.

WAVE ID

nm

µW

nm

dB dBm

µW

dB dBm

Single and Dual WAVE ID mode

REF

Hz

Item Field Description

a Battery status indicator Displays approximate remaining battery life. When the indicator flashes, the batteries should be changed immediately.

b REF indicator Press the REF button to toggle through stored reference values. The reference values for the currently selected wavelength (CW) or detected WAVE ID wavelengths will be displayed briefly in the following order:

CW mode: The reference value will be displayed in field e.

Single WAVE ID mode: The reference value will be displayed in field e.

Dual WAVE ID mode: The reference values will be displayed in fields e and g.

c WAVE ID indicator Displayed when a wavelength has been identified using the WAVE ID feature.

d Wavelength CW mode: Displays the currently enabled wavelength.

Single WAVE ID mode: Displays the detected WAVE ID wavelength.

Dual WAVE ID mode: Displays the first detected WAVE ID wavelength.

e Power Displays measured power (dBm or µW), or insertion loss (dB) at the wavelength displayed in field d.If power or loss is too high or too low for accurate measurement, this field will display HI or LO.

f Wavelength / Tone CW mode: Displays detected tone modulation frequency

in hertz (Hz).Dual WAVE ID mode: Displays the second WAVE ID wavelength.

g Power (Dual WAVE ID mode only)

Displays measured power (dBm or µW), or insertion loss (dB) at the wavelength displayed in field f.If power or loss is too high or too low for accurate measurement, this field will display HI or LO.

3

FLS 101 Function ButtonsPower Button

Press and hold to toggle the FLS 101 On or Off.

POWER

Multimode (MM) WAVE ID / CW SelectThis button provides two functions:

MM

CW

850nm1300nm

z Press and release to cycle through output wavelengths in the following order:Dual 850/1300 nm > 850 nm > 1300 nm > dual 850/1300 nm > ...

z Press and hold to switch to CW mode at the current wavelength, then press and hold the button again to select a single wavelength in the following order: 850 nm > 1300 nm > 850 nm ...

NOTE: To switch back to WAVE ID mode, press and release the button again.

Measuring Optical Power

NOTE: It is important to keep all optical connections and surfaces clean to ensure accurate measurements and operation. Always clean reference cables before conducting tests.

1. Turn on the FPM 101.

2. Select the appropriate fiber optic reference cable. The reference cable fiber type (SM or MM), must be the same as the type required by the output being measured.

3. Mount the appropriate adapter cap on the FPM 101 port.

4. Connect one end of the reference cable to the adapter cap and the other end to the optical output to be measured.

5. Press the wavelength button (see “Wavelength/Backlight” on page 1) to select the wavelength matching the nominal wavelength of the source being measured. The selected wavelength is indicated by e in the display.

6. Press the power selection button (see “dB/dBm/µW” on page 1) to display power in dBm, or press and hold to display power in µW. The power output is indicated by f in the display.

0000

0.00WAVE ID

nmHz

µWdB

0000

0.00nmHz

µW

dB

λRefdBm

dB

µW Set

POWER

Fiber Optic Equipment

a

f e

c

d

b

d

Reference Cable

Adapter Cap

FIBER POWER METER

FPM 101

ef

FPM/FLS 101 • Quick Start Guide (Continued)

4

MM active output port indicators — Light to indicate the wavelength of the MM output port.

z ON (continuous) — Single or dual WAVE ID mode

z ON (blinking) — CW mode

850nm

1300nm

Singlemode (SM) WAVE ID / CW SelectThis button provides two functions:

SM

CW

1310nm1550nm z Press and release to cycle through output wavelengths in the

following order: Dual 1310/1550 nm > 1310 nm > 1550 nm > dual 1310/1550 nm > ...

z Press and hold to switch to CW mode at the current wavelength, then press and hold the button again to select a single wavelength in the following order: 1310 nm > 1550 nm > 1310 nm...

NOTE: To switch back to WAVE ID mode, press and release the button again.

SM active output port indicators — Light to indicate the wavelength of the SM output port.

z ON (continuous) — Single or dual WAVE ID mode

z ON (blinking) — CW or Tone (1550 nm only) mode

1310nm 1550nm

Tone (1550 nm, SM Only)Press to toggle the 2 kHz tone on or off.

Tone indicator LED — Lights when the tone mode is active.

NOTE: When tone is active, the output is reduced by 3 dB.

External Power Indicator Lights when the AC power adapter is connected and powered.

Low Battery IndicatorLights to indicate low battery levels. Either change the batteries or connect the AC power adapter to continue use.

5

Testing Multimode or Singlemode Links Verify the Transmit Reference Cable

1. Turn on the power meter and light source. Allow the light source to stabilize for a minimum of two minutes prior to taking measurements.

2. Set the FLS 101 to the desired measurement wavelength.

a. Use WAVE ID to allow the FPM 101 to automatically read the wavelength.

b. If using CW, manually set the FPM 101 to the same wavelength.

3. Select and prepare the transmit reference cable. The fiber type, SM or MM, must match the link to be tested.

a. MM: Wrap and secure the transmit reference cable five times around the included mandrel.

b. SM (TIA testing only): Form and secure a 1.2 inch (30 mm) diameter loop in the transmit reference cable.

NOTE: Clean both ends of the transmit reference cable before proceeding.

4. Connect the transmit reference cable to the FLS 101 output port (MM or SM).

5. Mount an adapter cap on the FPM 101. The adapter cap must match the free connector on the transmit reference cable.

6. Connect the free end of the transmit reference cable to the power meter. If necessary press the dB/dBm button to display optical power in dBm.

NOTE: The normal power range is -20 dBm for MM, 0 dBm for SM, (+/-1 dB). Output power will be approximately 3 dB less if a 50 micrometer (µm) mandrel-wrapped reference cable is used instead of a 62.5 µm or when the tone feature is active.

7. If measured power is not within the acceptable range, or the display reads HI or LO, clean all fiber connections and measure again. If cleaning fails, replace the transmit reference cable and repeat steps 4 through 7.

8. To set the reference level for later use, press and hold the FPM 101 Ref/Set button until HELD SET is displayed. The currently measured level is now the new reference level for the active wavelength. Once the reference level is set, the FPM 101 switches to insertion loss (dB) mode and the display reads 0 dB, ± 0.05 dB.

FLS 101 FPM 101

0 dB

c

d

f

e

Transmit Reference CableMM: Mandrel Wrap (shown), orSM: 1.2" (30 mm) Dia Loop

FPM/FLS 101 • Quick Start Guide (Continued)

6

FPM 101

0.4 dB

Coupleror

Bulkhead

Receive ReferenceCable

Transmit ReferenceCable

Adapter Cap

MM: Mandrel Wrap orSM: 1.2" (30 mm) Dia Loop (Shown)

Do Not RemoveThis Connection

FLS 101

Verify the Receive Reference Cable9. Disconnect the transmit reference cable from the power meter.

10. Select and prepare the receive reference cable (fiber type, SM or MM, must match the link to be tested).

NOTE: Clean both ends of the receive reference cable before proceeding.

11. Connect the receive reference cable to the FPM 101 using an appropriate adapter cap.

12. Connect the free ends of the transmit and receive reference cables together with a coupler or at the bulkhead.

13. Verify the insertion loss (dB) of the transmit and receive reference cable pair is less than 0.75 dB, the maximum allowed by TIA standards (Extron recommends 0.4 to 0.5 dB).

If the insertion loss (dB) is not within these values:

z Disconnect the transmit and receive reference cables at the coupler (or bulkhead), and clean the free ends of both reference cables and the coupler (or bulkhead). Disconnect the receive reference cable from the power meter and clean it, then repeat steps 11 through 13.

z If the value is still not acceptable, replace both reference cables and begin again with step 1 on page 5.

7

Insert the Link14. Once the loss value is acceptable (< 0.75 dB) disconnect both the transmit and receive

reference cables from the coupler or bulkhead.

NOTE: Do not disturb either reference cable at their meter connections.

15. Insert the link to be tested by connecting it to the free ends of the transmit and receive reference cables using appropriate couplings, or connect the reference cables to the bulkhead connections of the link.

16. Observe the displayed value. The link cable insertion loss is displayed in dB. The two examples below show a multimode and singlemode fiber link being measured using dual WAVE ID.

The first example shows a multimode link. The 850 nm wavelength is reading a 3.65 dB loss and the 1300 nm wavelength is reading a 4.07 dB loss.

The second example is a singlemode fiber. The 1310 nm wavelength is reading a 1.45 dB loss and the 1550 nm wavelength is reading a 1.49 dB loss.

FLS 101Fiber OpticLight Source

Singlemode Fiber Under Test

Coupleror

Bulkhead

Mandrel

Multimode Fiber Under Test

FPM 101Fiber OpticPower Meter

Transmit Reference Cable

Receive Reference Cable

Transmit Reference Cable

Receive Reference Cable

FLS 101Fiber OpticLight Source

FPM 101Fiber OpticPower Meter

Coupleror

Bulkhead

Coupleror

Bulkhead

Coupleror

Bulkhead

Loop

9V

850nm 1300nm 1310nm 1550nm

Tone

1310nm1550nm

850nm1300nm

CWCW

FIBER OPTIC LIGHT SOURCE

Extron

dBdBm

Ref

Set

Extron

Optical Power Meter

WAVE ID

9V

850nm 1300nm 1310nm 1550nm

Tone

1310nm1550nm

850nm1300nm

CWCW

FIBER OPTIC LIGHT SOURCE

Extron

dBdBm

Ref

Set

Extron

Optical Power Meter

WAVE ID

nm

dB

nm

dB

nm

dB

nm

dB

WAVE ID

nm

dB

nm

dB

850

3.651300

4.07

WAVE ID

nm

dB

nm

dB

1310

1.451550

1.49

FLS 101FIBER LIGHT SOURCE

MM SM

POWER

FLS 101FIBER LIGHT SOURCE

MM SM

POWER

POWER

FPM 101FIBER POWER METER

POWER

FPM 101FIBER POWER METER

FPM/FLS 101 • Quick Start Guide (Continued)

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© 2011 Extron Electronics All rights reserved. www.extron.com 68-2047-50 Rev. A 06 11

Included Accessories

z LC adapter cap for FPM 101

z LC output port adapter for FLS 101 (x2)

z LC reference cable, singlemode (x2)

z LC reference cable, multimode (x2)

z LC to LC coupler (x2)

z USB power cable

z Multimode cable mandrel, 62.5 µm

z Multimode cable mandrel, 50.0 µm

z FPM/FLS 101 Quick Start Guide