XL-FMS125A
Optical Multi Meter
User`s Manual
XL-FMS125A User's manual www.xtendlan.com
Content
1. Overview………………………………………………3
2. Features………………………………………………3
3. Applications…………………………………………..3
4. Specifications………………………….……………..4
5. Standard Packages………………………………….4
6. Panel, keys and functions…………………………..5
7. Operation and Notes………….…………………….6
8. Trouble-shooting……………………………………..8
9. Change Battery………………………………………8
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XL-FMS125A User's manual www.xtendlan.com
1.Overview
XL-FMS125A Optical Multi Meter is a handheld and intelligent instrument, which can be
used as optical power meter and stabilized light source, and can constitute integral test
system. It is an updated version of a popular in the industry optical power meter with a
built in LD stabilized light source at 1310&1550nm wavelength, one port output .It is
specifically designed for technical support personnel to take a variety of instruments with
a single meter.
2. Features
(1) Dual-wavelength LD stabilized Light Source, one port output.
(2) Battery (Rechargeable) + AC Power Supply.
(3) Just-push-it key function for light source on or off, easy-to-use.
(4) Truly universal output adapter design, without troublesome different adapters
change in operation when SC or ST connection needed.
(5) Different Light Source and Power Meter can be built into XL-FMS125A, tailor to
customer requirements.
3.Applications
Optical cable laying site or laboratory
Optical communication systems
Optical fiber attenuation measurement
Optical communication system maintenance
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XL-FMS125A User's manual www.xtendlan.com
4.Specifications
Parameter Value
Detector InGaAs
Power
Meter
Light
Source
Wavelength (nm) 800~1600
Operation Wavelength (nm) 850,980,1310,1550
Measurement Range (dBm) optional
Resolution (dB) 0.01
Uncertainty ±5%
Emitter Type F-P ,DFB.LED
Operation Wavelength (nm) 1310/1550(optional)
Output Power (mW)
≥-7dBm(FP,DFB)
≥-20dBm(LED)
Type XL-FMS125A
Power
8.4V Battery (rechargeable)+C
AC Power Supply
Auto-off time 10minutes
≥2hours(Light Source and Optical
Optical
Multi Meter
Rechargeable Battery Working
Time
Power Meter work at the same
time) 28 hours (only optical power
meter work)
Operation Temperature(℃)
-10~+60
Dimensions (mm) 150X76x26
Weight (g) 250
5 Standard Packages
Unpack the XL-FMS125A package and check that the following standard
components are included with your order:
XL-FMS125A Handheld Optical Multi Meter………………….1
Manual……………………………………………….……1
Protective Holster………………………………………..1
8.4V Battery (rechargeable) …………………………….1
AC Adapter for power supply…………..……………….1
Carrying Case……………………………………………1
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XL-FMS125A User's manual www.xtendlan.com
Your order has been provided with the safest possible packaging, but shipping damage
does occasionally occur. Inspect your order carefully for damage that may have occurred
during shipment.
6.Panel and Functions
Keys and Functions
(1) Liquid Crystal Display
Measurements are displayed in absolute or relative digit in addition to set wavelength.
(2) ON/OFF Key
Pressing the on/off key turns the unit on or off. (XL-FMS125A default is power meter) The
XL-FMS125A will conserve battery life by automatically turning off if no keys have been
pressed for approximately 10 minutes.
(3) 1310 Key
When the XL-FMS125A optical multi meter is on, press the “1310”key, XL-FMS125A light
source works properly at 1310nm, and the 1310 indicator light is on. Press the “1310”key
again, 1310nm light source is off. When the light source works properly at 1550nm, press
the “1310” key , it will work at 1310nm again.
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(4) 1550 Key
When the XL-FMS125A optical multi meter is on, press the “1550”key,XL-FMS125A light
source works properly at 1550nm, and the 1550 indicator light is on. Press the
“1550”key again, 1550nm light source is off. When the light source works properly at
1310nm, press the “1550”key , it will work at 1550nm again.
(5) W/dBm Key
Under the condition of set wavelength, press the key displaying the absolute power
measurement value. Meanwhile it can transform the absolute value to the relative value
by pressing the key.
(6)“ZERO” Key
Press the key for auto-zero, displaying “NULL” in the LCD.
(7)“HOLD” Key
Press the key for storage current measurement value.
(8) “dB” Key
Under the condition of set wavelength, press the key displaying the relative measurement
value.
(9) “λ”Key
The Greek symbol lambda (λ) is used to denote wavelength of light. Pressing the λKey
selects the wavelength to the measured. It has four wavelengths available: 850nm,
980nm, 1310nm, and 1550nm. Annunciations in the LCD will indicate the currently
selected wavelength.
7. Operation
How to use the optical power meter:
7.1 Switch on/off
1. Push ON/OFF key, LCD displays, switch on.(default: optical power meter)
2. OFF key, LCD becomes dark; switch off.
7.2 Absolute power measurement
1. Set measurement wavelength via λ key. Default wavelength is 1310nm.
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2. Push W/dBm key until dBm unit is displayed.
3. Input light to be measured, then reading is displayed in LCD.
4. Linear and nonlinear value can be displayed by pushing W/dBm key.
7.3 Relative Power Value (Optical Link Loss) measurement.
1. Set wavelength for measurement.
2. Under “Absolute power measurement mode”, input light and push dB key, then
current power is stored as a reference value.
3. Input another light to be tested, and then relative power value is displayed.
7.4 Zero Adjustment
Press the “ZERO” key, optical power meter restores, indicating the “NULL” value in the
LCD, the calibration wavelength is 1310nm.
How to use the Light Source:
7.5 Switch on/off
1. Push ON/OFF key, LCD displays, switch on. (Default: optical power meter)
2. Push ON/OFF key, LCD becomes dark; switch off.
7.6 1310nm Light Source
Press the “1310”key, XL-FMS125A works properly at 1310nm,and the 1310nm indicator
light is on.
7.7 1550nm Light Source
Press the “1550”key, XL-FMS125A works properly at 1550nm,and the 1550nm indicator
light is on.
7.8 Transform the operating wavelength at 1310nm or 1550nm
When the light source is on, press the “1310” or “1550” key, it can transformer the
operating wavelength at 1310nm or 1550nm.
7.9. Switch off the Light Source when the XL-FMS125A is on
1.Identify the working wavelength
2. Press the relative key, switch off.
3. The light source will conserve battery life by automatically turning off, if 1310 or 1550
key have no been pressed for approximately 5 minutes. The power meter is on.
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8. Trouble-shooting
Description Probable cause Method
Faint LCD display
Switch on but no
display
Insensitive display in
LCD
The output port is
polluted.
Output power is
fluctuating..
Battery is
inadequate
Battery is
inadequate /Others
Light interface is
polluted of
broken/Display
locked
Change battery/recharge the
battery for two hours
Switch on again/Change battery
Check light interface carefully and
clean sensor’s interface/Press
“HOLD” key again.
Clean the connector with alcohol
smoothly.
After warm-up for 15 minutes, then
operate it.
9.Change Battery
9.1 you find battery is not enough while operating it, switch off XL-FMS125A.
9.2 The provided battery can be recharged with AC adapter for power supply.
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