XL-FM125A
Handheld Power Meter
User`s Manual
Content
1. Overview……………………………………..………..…3
2. Specifications…………………………………………….4
3. Standard Packages……………………………………...5
4. Components Guide……………………………………...4
5. Operation and Notes…………………………………….6
6. Maintenance…………...………………………………...9
7. Troubleshooting………………………………………...9
8. Changing battery…………………………………….…9
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1. Overview
Our designs series optical power meter to meet the high demand. It
intergrades the handheld optical power meter and the intelligent optical power
meter in one unit.
It can be used for the absolute power measurement and relative
measurement of the link loss in dB.
Its compact size, friendly operation interface, broad power measurement
range, high precision and brand-new user automatic calibration function and
high performance in application makes it an ideal tool for optical fiber network.
XL-FM125A Handheld Power Meter Specification Model:
XL-FM125A Handheld Power Meter A--Wavelength: 850nm, 980nm, 1300nm,
1310nm,1490nm, 1550nm
Measurement Range: -70 to +3dBm
XL-FM125AHandheld Power Meter C--Wavelength: 850nm, 980nm, 1300nm,
1310nm,1490nm, 1550nm
Measurement Range: -50 to +26dBm
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2. Specifications
Model XL-FM125A
Wavelength Range（nm）
*1
800~1600
Detector Type InGaAs
Measurement Range (dBm)
Uncertainty
*3
*2
-70~+3
±0.15dB
Accuracy Linear 0.1% or Nonlinear 0.01dBm
Operating Temperature (℃)
Storage Temperature (℃)
-10~+60
-25~+70
Auto-off Time (min) 10
Operating Time (h)
≥130
Battery 3 AA1.5V
Weight (g) 200
Dimensions (mm) 152X74X26
Notes:
1. Wavelength Range: Specified standard operating wavelength range in
which the Power Meter can work properly under certain technical
specifications.
2. Power Measurement Range: The maximum and minimum range in which
the Power Meter can work properly.
3. Uncertainty: Difference between two measurement results that were tested
by Power Meter and another Standard Power Meter respectively.
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Standard packages
1. XL-FM125AHandheld Power Meter………………………….1
2. Manual………………………………………………….…1
3. Protective Holster…………………………………………1
4. 1.5V AA Battery…………………………………….……..3
5. Cotton Swabs……………………………………………..1
3. Components Guide
(1) LCD:
The LCD screen display the measurement tested in dB, dBm, mW, uW, nW
unit; the selected wavelength; the current operating situation and so on.
(2) ON/OFF Key:
Press the key to turn the unit on/off.
(3) dB Key:
To test the power value under certain wavelength.
(4) ZERO Key:
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Press the key for auto-zero.
(5) “λ” Key:
To switch the current operating wavelength between 850nm, 980nm,
1300nm, 1310nm,1490nm, 1550nm
LIGHT Key:
To turn the background light on/off .
5.Operation and Notes
5.1 ON/OFF
(1) Press the On/Off key for a few seconds to turn on the unit
(2) Press the On/Off key for a few seconds to turn off the unit
5.2 Absolute power measurement
(1) Turn on the Power Meter
(2) Press the λ key to switch between the wavelengths. The default
wavelength is 1310nm.
(3) Connect the light to be measured, and then reading will be displayed
on the LCD screen, including Linear and nonlinear value.
5.3 Relative power measurement.
(1) Select the wavelength to be measured.
(2) Under “Absolute power measurement mode”, connect to the light
to be tested.
(3) Press dB key, then current power value is stored as a reference
value in dB unit. At the same time it also display the current
absolute power value and current relative value is 0dB.
(4) Connect to another beam of light to be tested, display the current
relative power value and absolute power value under tested..
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5.4 Special function
JW 3208 have 3 kinds of working mode: (1) Factory Mode
(2) User Mode
(3) Working Mode
5.4.1 Factory Mode: The factory is responsible for the test and calibration
5.4.2 User Mode: Press the λ + Light key synchronously, then enter the User
mode. Numeral "1" will be displayed on the top right corner. Press theλ +
Light key synchronously once again, it exit from the User mode and enter the
Working mode. Numeral "0" will be displayed on the top right corner.
Function Button
Plus 0.05 Light
Minus 0.05 dB
Store Zero
Switch Wavelength
Return to the Factory
Setting
Notes: If any errors or mistakes caused by the user self-calibration operation,
please press theλ+ Zero synchronously under the user mode to go back to the
factory setting.
λ ―――
λ+ Zero ―――
―――
―――
―――
―――
(1) Auto-off : Press LIGHT + dB key to turn on the auto-off function. The
auto-off symbol will be displayed on the top right. The unit will be turn off
automatically after 10 minutes idle time.
(2) Background light On/Off: Under the Working Mode, press LIGHT to turn
the background light On/Off. A little sun symbol will be displayed on the top
right.
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Appendix:
Optical fiber loss measurement
Step 1- Optical Reference Level
l Turn on optical power meter and press the λ key to select the wavelength.
l Turn on optical light source (emitting source) and select the wavelength.
Wait for 1-2 minutes until it stabilize.
l Select a piece of patch cords, which is used to connect with the light
source, we call it emitting patch cords. Cleaning connector of the patch
cords. The fiber of the emitting source patch cords must be the same fiber
type as the fiber under test.
l Connect the light source (emitting source) with the Handheld Power Meter
through the emitting source patch cords
l Handheld Power Meter get the power measurement value.
This value should be close to the one that light source (emitting source) set.
If it has wide disparity, please make sure the fiber connection is clean
properly else replace another jumpers.
l Press the dB key; the reading 0.00dB will be displayed on the screen. The
tested power values will be set to the reference value.
Step 2-Optical Loss Measurement
l Keep the emitting source patch cords connection with the light source
(emitting source).
l Connect the Handheld Power Meter and light source (emitting source) to
the optical fiber link respectively.
Notes: cleaning all the connectors surface including all the necessary optical
adaptors. The reading in dB unit displayed on the screen is the tested optical
fiber link loss.(also display the current absolute optical power value in dBm
unit).
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6.Maintenance
1. It is important to keep all optical connectors and surfaces free from oil,
dirt or other contamination to ensure proper operation.
2. Keep using one type of adapter to avoid excess loss from different
connectors.
3. Please use dust proof cap for protection to avoid begin scratched or
contaminated when Handheld Power Meter not in operation.
4. Light interface is sensitive, please carefully plug in and pull out the
connectors.
5. Please use clean cotton to clean the sensor surface, clean it in
clockwise direction carefully.
6. If does not need to use for a long time, please take out the battery.
7.Troubleshooting
Description Problem Method
Faint LCD display Battery is weak Change battery
No display after
turning on the unit
Insensitive display in
LCD
8.Change Battery
Battery is
weak/Others
Light interface is
polluted/
broken/Display
locked
Turn on the unit
again/Change battery
Check connector
carefully and clean
sensor’s interface
If you find battery is weak while operating it, please immediately turn the unit
off and change a new battery.
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