OPTOKON OFT-840 User manual

is registered trademark of OPTOKON, a.s. Other names and trademarks mentioned herein may be the
trademarks of their respective owners.
OPTOKON, a.s., Cerveny Kriz 250, 586 01 Jihlava, Czech Republic
tel. [phone], fax [phone], WWW.OPTOKON.COM, [e-mail]
27/10/2017
OFT-840
Loss Test Set
INSTRUCTION MANUAL
Revision 1.1

2
is the registered trademark of OPTOKON, a.s. Other names and trademarks mentioned
herein may be the trademarks of their respective owners
All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic,
or mechanical, including photocopying, recording, taping or information storage and retrieval systems - without
the written permission of the publisher.
Products that are referred to in this document may be either trademarks and/or registered trademarks of the
respective owners. The publisher and the author make no claim to these trademarks.
While every precaution has been taken in the preparation of this document, the publisher and the author
assume no responsibility for errors or omissions, or for damages resulting from the use of information
contained in this document or from the use of programs and source code that may accompany it. In no event
shall the publisher and the author be liable for any loss of profit or any other commercial damage caused or
alleged to have been caused directly or indirectly by this document.
OPTOKON, a.s.
Cerveny Kriz 250
586 01 Jihlava
Czech Republic
tel. [phone]
fax [phone]
WWW.OPTOKON.COM
[email protected]

OFT-840 INSTRUCTION MANUAL
3
Contents
1Introduction.................................................................................................4
2Features ......................................................................................................4
3Application...................................................................................................4
4Accessories ..................................................................................................5
4.1Standard.......................................................................................................................5
4.2Optional.......................................................................................................................5
5Specifications ...............................................................................................6
6Safety information ........................................................................................7
7Maintenance ................................................................................................8
7.1Battery maintenance....................................................................................................8
7.2Instrument maintenance...............................................................................................8
7.3Recommended cleaning and mating instructions........................................................9
7.4Light source Adaptor set exchange ...........................................................................10
8Instrument and button function description .................................................. 13
8.1General description....................................................................................................13
8.2Power meter...............................................................................................................14
8.2.1Menu #1 –Absolute power measurement mode.................................................14
8.2.2Menu #2 – Relative power measurement mode.................................................15
8.3Menu #3 – Navigation...............................................................................................16
8.4Light source...............................................................................................................17
8.4.1Menu #4 – Light source menu............................................................................17
8.5ORL – Optical Return Loss meter.............................................................................18
8.5.1Menu #5 – ORL..................................................................................................18
8.6Menu #6 – Internal memory operation......................................................................19
8.6.1SAVE RESULT .................................................................................................20
8.6.2BROWSE RESULTS.........................................................................................21
8.6.3UPLOAD MEMORY.........................................................................................21
8.6.4ERASE MEMORY............................................................................................22
8.6.5HOME................................................................................................................22
9Measuring loss ........................................................................................... 23
9.1Basic theory...............................................................................................................23
9.2Method 6 - two instruments.......................................................................................25
9.2.1Setting the reference...........................................................................................25
9.2.2Measuring Loss..................................................................................................26
9.3Method 6 - one instrument.........................................................................................27
9.3.1Setting the reference...........................................................................................27
9.3.2Measuring Loss..................................................................................................28
9.4Method 7 - two instrument ........................................................................................29
9.4.1Setting the reference...........................................................................................29
9.4.2Measuring Loss..................................................................................................30
9.5Method 7 - one instrument.........................................................................................31
9.5.1Setting the reference...........................................................................................31
9.5.2Measuring Loss..................................................................................................32
10Measuring Reflectance or Return loss ........................................................ 33
11Setting up data transfer............................................................................ 34
12Power loss and decibels............................................................................ 37
13Notes...................................................................................................... 38
14Calibration, service center......................................................................... 39

OFT-840 INSTRUCTION MANUAL
4
1Introduction
The OFT-840 series optical Loss Test Set with optical Return Loss (RL) combines
optical Light Source, Power Meter and Return Loss testing in the same box. The
optical Light Source fulfills all the necessary technical requirements for field
equipment. Available in two working wavelengths: 1310 or 1550 nm. The optical
Power Meter is designed to measure absolute or relative optical power in optical
networks. The optical RL function provides extended measurement range with
improved linearity.
The memory capacity allows storage and uploading of up to 3000 measurements
including memory position or fiber number, wavelength, absolute value or relative
value and insertion loss. The SmartProtocol PC evaluation software supports memory
download, test report generation and Data Exporter for data download to Excel
sheet.
2Features
Optical Light source, Power meter and Return loss tester
High capacity two level memory
SmartProtocol PC software: memory download, reporting solution
Data Exporter PC software: data download to Excel sheet
Detection of modulation 270 Hz, 1 kHz, 2 kHz
AWD (Auto Wavelength Detection) function
USB port - battery charging, data download, FW upgrade
USB probe mode - full control via simple commands
Absolute and Relative optical power measurement
Displayed units: dBm, dB, W
Powered by built-in Li-Pol rechargeable battery
Battery status indicator, auto Off function
3Application
IL and RL measurement
Absolute or relative optical power measurement
Optical network measurements
Measurement output power of optical transmitters
Measurement input power of optical receivers
Measurement attenuation in fibre cabling.
Measurement loss in connectors, splices, adaptors, switches and other
components
Easy and rapid identification of failure points in fiber networks
Suitable for SM and MM applications

OFT-840 INSTRUCTION MANUAL
5
4Accessories
4.1 Standard
SmartProtocol PC software
USB connection cable
PM: Universal 2.5 mm adapter
LS+RL: adapter FC/APC1
Master patchcords:
FC/APC – FC/APC (master at both ends)
Master measuring adapters:
FC/APC
Power charging AC/DC adaptor
Traceable calibration certificate
Hard carrying case
4.2 Optional
Power meter:
universal SFF 1.25 mm, LC, SC FC, ST
Light source/Return loss – optional adapter SC
Master patchcords: FC/APC – LC/APC, FC/APC – LC/PC
FC/APC – SC/APC, FC/APC – SC/PC
Master measuring adapters: LC/APC, LC/PC, SC/APC, SC/PC
Note: 1) FC/APC – NPC205 standard
Power meter interface
Other types available on request:
TE-ADP-ST ST adapter
TE-ADP-DIN DIN adapter
TE-ADP-SMA SMA adapter
TE-ADP-MU MU adapter
TE-ADP-
FC/APC
FC adaptor
TE-ADP-LC
LC adaptor
TE-ADP-SC
SC adaptor
TE-ADP-250
2.5 mm
TE-ADP-125
1.25 mm
Light source – Return loss meter interface:
TE-ALS-FC/APC TE-ALS-SC
Standard configuration of IN/OUT ports:
LS TE-ALS-FC/APC
PM TE-ADP-250 universal 2.5 mm

OFT-840 INSTRUCTION MANUAL
6
5Specifications
General specifications Note:
Dimensions 165 x 80 x 50 mm with 2.5 mm universal adapter
Weight 400 g with battery
Temperature operating
storage
Humidity (non condensing)
-10 to +50 °C
-40 to +70 °C
0 to 95%
Operating temperature -10 to +50 °C
Battery working time > 50 hrs between battery charging
Battery life time > 2 years 3000 mA/h Li-Pol
Compliant with RoHS-requirements (2002/95/EG, 27.01.2003)
Light Source
Output power
LD 1310, 1550 nm -2 dBm typ. value
Stabilit
y
(
1 hour
,
delta
/
2
)
: tested after 20 min warm up
t
e
m
pe
r
a
t
u
r
e
2
3
± 1°
LD 1310
,
1550 nm ± 0.05 dB
Power Meter
Photodetector 1 mm InGaAs
Working wavelengths 850, 1300, 1310, 1490, 1550, 1625
nm can be customized
Dynamic range: Standard -65 dBm to +10 dBm
-57 dBm to +10 dBm
1300, 1310, 1490, 1550, 1625
nm
850 nm
Uncertainty ± 5% 1310, 1550 nm @ -20 dBm
Resolution 0.01
AWD/Modulation Detection -50 dBm 1300 – 1625 nm
Return Loss Meter
Range 0 - 70 dB
Accuracy 0 - 50 dB: 0.5 dB 50 - 70 dB: 1 dB

OFT-840 INSTRUCTION MANUAL
7
6Safety information
OFT-840 Light source complies with the following safety classifications:
IEC825-1 and 21CFR1040: Class1
This applies to laser and LED options up to 1 mW, above 700 nm. Devices in this
category are classified as safe for use by technicians under normal viewing, provided
that magnifying devices are not used.
It is the responsibility of the user to acquire adequate training and
familiarity with relevant safety issues and work practices before using this
equipment.
WARNING!
The OFT-840 Power meter emits no optical power itself and does not create any
hazards to the user.
To ensure a high level of operator safety during installation, commissioning and
operating the equipment, as well as ensuring that the equipment remains
undamaged, it is necessary to consider the following general warnings and
recommendations.
Never use magnifying devices to inspect optical fiber ends unless you are certain
that no optical power is being emitted.
Only use magnifying devices with a built-in infra-red filter to ensure safety.
During operation, testing or maintenance of a fiber optic system, never look into
an active fiber optic cable. Infrared radiation may be present and this can result
in permanent eye damage.
Avoid direct exposure to the beam.
Do not activate the laser when there is no fiber attached to the optical output
connector.
Optical connectors must be clean, in case the connectors are not perfectly clean –
please clean them according to the procedure described in the technical
specification for the relevant connectors.
Use only the equivalent connector types to those built into the instrument in
order to avoid damage to the instrument components.
Under no circumstances should you look into the end of an optical cable attached
to the optical output when the device is operational. The laser radiation can
seriously damage your eyesight.
Installation, commissioning, operation and service of equipment with high power
level are only allowed to be carried out by an authorised person.

OFT-840 INSTRUCTION MANUAL
8
7Maintenance
7.1 Battery maintenance
The OFT-840 comes equipped with a built-in charger and is powered by Li-Pol type
battery (standard accessories).
Charging – via USB port (PC) or by using external USB power charging
adaptor (standard accessories)
Before using the OFT-840 for first time, charge fully the batteries.
Use only supplied USB power charging adapter.
Charging is not recommended until battery status indicator is 30% or less.
Charge the batteries fully before storing the tester for a long period. The
batteries will lose its capacity during storage.
If you are not going to use the OFT-840 for long period, charge the batteries
once every six months.
The batteries are a consumable. Repeated charging and discharging decreases
batteries lifetime.
To extend batteries lifetime it is recommended that batteries be completely
drained before re-charging – battery refresh.
7.2 Instrument maintenance
During storage and transport keep the instrument in its carry case to protect
against crushing, vibration, dust and moisture.
Where possible keep the instrument away from strong sunlight.
Clean the instrument housing using alcohol or other cleaning agents. Acetone or
other active solvents may damage the case.
The instrument is resistant to normal dust and moisture, however it is not
waterproof. If moisture does get into instrument, dry it out carefully before
using it again.
-48.95 dBm
 LOSS MORE
1310nm
19 nW
battery status
indicator

OFT-840 INSTRUCTION MANUAL
9
7.3 Recommended cleaning and mating instructions
Cleanliness will affect the performance of an
optical fiber system. Perform the following
procedures prior the installation. Clean all
connectors, adapters, and attenuators before
making any connections. The following cleaning
materials are recommended and may form part
of Your cleaning kit:
Lint-free laboratory wipes.
Isopropyl alcohol in pressurised
dispenser
Lint free pipe cleaners.
Clean, dry, oil-free compressed air.
CLEANING
Connectors/Terminators:
1. Fold a clean, new wipe into a 2” by 2” square
pad.
2. Moisten, but do not saturate, the pad with
alcohol making a spot approximately 1/2” in
diameter.
3. Open the protective cap (E2000 only).
4. Press the ferrule and face into a wet spot on
the wipe. Using force, twist the ferrule so
that a hard wiping action takes place. Repeat
twice, using a clean alcohol-moistened at
each time.
5. Press the ferrule end face into a dry spot on
the wipe. Using force, twist the ferrule so
that a hard wiping action takes place
6. Close the cap (E2000 only)
7. Discard the used pad.
Attenuators:
1. For an exposed ferrule (in-line type), see
connector cleaning procedure, blow the other
end dry with clean compressed air.
2. Clean bulkhead attenuators only by blowing
with clean compressed air.
Adapters:
1. Moisten one end of a lint-free pipe cleaner
with alcohol.
2. Remove express alcohol from the pipe
cleaner with a clean wipe.
3. Insert the moisten pipe cleaner into either
end of the adapter and scrub in and out so
that the inside surface of the adapter is
wiped by the pipe cleaner. Repeat this step
for the opposite end.
4. Insert the dry end of the pipe cleaner into
either end of the adapter to remove any

residual alcohol. For oversized adapters
(biconic), slightly blow the middle of the pipe
cleaner fog better surface contact. Repeat
this step for the opposite end.
5. Blow the adapter dry with clean compressed
air.
MATING
SC, MT-RJ, LC:
1. Align the housing key with the slot in the
adapter.
2. Push the connector into the adapter until a
click is heard/felt indicating the latching
system is engaged. When the SC connector
is fully engaged, the white stripes on the side
of the housing should be hidden inside the
adapter.
FC:
1. Insert the ferrule tip into the adapter.
2. Align the key with the slot in the adapter.
3. Push the connector into the adapter until the
coupling nut reaches the adapter housing.
4. Screw the coupling nut clockwise into the
adapter.
E2000:
1. Align slots with key on adapter.
2. Push the connector into the adapter until it
clicks.
ST:
1. Align the ferrule hub key with the slot in the
adapter.
2. Insert the connector into the adapter until
the coupling nut reaches the adapter
housing.
3. Align the bayonet slots-on the coupling nut
with the pins on the outside of the adapter.
4. Push the coupling nut into the adapter while
rotating the coupler nut clockwise to lock the
bayonet and secure the connection.
Infrared radiation is invisible and can
seriously damage the retina of the eye Do
not look into the ends of any optical fiber.

OFT-840 INSTRUCTION MANUAL
10
7.4 Light source Adaptor set exchange
The OFT-840 comes equipped with an adaptor set (FC or SC adaptor). The adaptor
set includes:
adaptor body with flange
two screws
adaptor sleeve
adaptor nut.
For exchanging the adaptor or cleaning the ferrule end face please use the following
instructions:
1. Description of IN/OUT ports
PM IN port: TE-ADP-250
universal adapter
LS/RL OUT port: TE-ALS-FC/APC
adapter
2. The procedure of exchange – removal of LS/RL adaptor is the same as for
light source LS-800 OUT port described below:

OFT-840 INSTRUCTION MANUAL
11
3. Loosen the two adaptor flange screws
4. Carefully remove the adaptor body, be careful of the sleeve
5. Using the optical connector ferule, carefully remove the adapter sleeve

OFT-840 INSTRUCTION MANUAL
12
6. Remove the adaptor nut. Now the adaptor set is fully removed.
If necessary, carefully clean the ferrule end face using alcohol and lint-free
laboratory wipes.
7. Insert the adaptor nut and the sleeve back.
8. Attach the appropriate adaptor body and tighten the screws again

OFT-840 INSTRUCTION MANUAL
13
8Instrument and button function description
8.1 General description
Power meter and Light souce /
Return loss meter ports
LCD display
Operating buttons
USB port
ON/OFF button
Backlight key
[ON/OFF]
Press to turn the unit on. Press to turn the unit off.
After switching on, the type of device, serial number and firmware version will be
displayed.
The unit will start up with “AUTO OFF” feature – symbol “ “ will be displayed.
For disable the AUTO OFF feature press and hold the ON/OFF key until symbol
“ “ disappear.
If activated, the unit will turn off after approximately 10 minutes of no activity.
[BL]
Turns the Display Backlight On and Off.
[ ] Functionality of these keys depends on current menu.

OFT-840 INSTRUCTION MANUAL
14
8.2 Power meter
8.2.1 Menu #1 –Absolute power measurement mode
In the absolute power measurement mode the absolute value of the optical signal in
dBm units is shown on the display.
This screen will appear after the instrument is switched on and information regarding
the type of device, serial number and firmware version will appear.
Reading the display:
[]
Selecting of 850, 1300, 1310, 1490, 1550, 1625 nm wavelengths or AWD
(Auto Wavelength Detection).
Auto Wavelength Detection is notified by the “AWD” on the display.
Note: Light source with AWD modulation ON must be connected to Power meter in
order to use this feature.
[LOSS]
Activates the relative power measurement mode (unit dB).
Recalls the last set reference for a selected wavelength.
Goes to menu #2.
[MORE]
Goes to navigation menu #3.
working
wavelength
measured
optical power level
AWD is switched ON

OFT-840 INSTRUCTION MANUAL
15
8.2.2 Menu #2 – Relative power measurement mode
In the relative power measurement mode is on the value of optical insertion loss in
dB units which corresponds to performed reference is shown on the display.
Reading the display:
[O.POW]
Returns unit into absolute power measurement mode (unit dBm).
Goes to menu #1.
[REF]
Sets and stores the new reference for the selected wavelength
Note: The new reference must be confirmed by the following screen:
[MORE]
Goes to navigation menu #3.
8.12 dB
O. POW REF MORE
1310nm
-9.10dBm
L
O
S
S 025. dB
O. POW REF MORE
G
A
I
N
1310nm
-9.10dBm
CONFIRM NO
SET NEW
REFERENCE
selected
wavelength
measured
optical loss/gain
reference
level

OFT-840 INSTRUCTION MANUAL
16
8.3 Menu #3 – Navigation
[LS]
Goes to Light source menu#4.
[ORL]
Goes to Return loss mode menu#5.
[MEM]
Goes to Memory menu #6.
Starts working with the internal memory.

OFT-840 INSTRUCTION MANUAL
17
8.4 Light source
8.4.1 Menu #4 – Light source menu
Reading the display:
[]
light source
required wavelength settings.
[MOD]
Selects the modulation:
CW – Continuous wave
270 Hz – 270 Hz Modulation
1 KHz – 1 kHz Modulation
2 KHz – 2 kHz Modulation
AWD – Auto Wavelength Detection – Modulation
[PM]
Returns unit into absolute or relative power measurement mode (unit dBm or dB).
Goes to menu #1 or #2.
 MOD PM
CW
LS OFF
LD 1550 nm

MOD PM
CW
LD 1310 nm
 MOD PM
270Hz
LD 1310 nm

MOD PM
AWD
active output port
battery status
indicator

OFT-840 INSTRUCTION MANUAL
18
8.5 ORL – Optical Return Loss meter
8.5.1 Menu #5 – ORL
Master patchcord with APC connectors
No reflection Master patchcord with PC connector Reflection from open port fiber - air
[]
Return loss meter
required wavelength settings.
[CAL]
Return loss meter calibration – Service menu
[MORE]
Back to Navigation menu #3

OFT-840 INSTRUCTION MANUAL
19
8.6 Menu #6 – Internal memory operation
The memory of OFT-840 has a structured, two-level organization. The results are
stored in memory positions (FIBER) in folders called Cable (CABLE). See table below:
This screen will appear after pressing [MORE] key from Menu#1 or Menu#2 then
[MEM].
[UP], [DOWN], [OK]
Use these buttons for selection appropriate submenu.
CABLE001 FIBER001
FIBER002
FIBER003
FIBER004
FIBER005
FIBER006
..................
FIBERXXX
CABLE002 FIBER001
FIBER002
FIBER003
FIBER004
FIBER005
FIBER006
..................
FIBERXXX
CABLEXXX FIBER001
FIBER002
FIBER003
FIBER004
FIBER005
FIBER006
..................
FIBERXXX
....................
UP DOWN OK
SAVE RESULT
BROWSE RESULTS
UPLOAD MEMORY
ERASE MEMORY
HOME

OFT-840 INSTRUCTION MANUAL
20
8.6.1 SAVE RESULT
1. By using [UP] [DOWN] select “SAVE RESULT” and press [OK].
2. Select the cable (folder) using [- CABLE +], the unit will display the number of
saved results under the selected cable, then press [FIBER].
3. The unit will suggest the FIBER position under the selected CABLE.
Accept the suggested FIBER position and save the result by pressing [SAVE] or
change the memory position using [- FIBER +], than press [SAVE] to save the
result.
NOTE: If the selected memory position is already occupied, the “!” mark will appear
on the display.
By pressing [SAVE], the new result will OVERWRITE the selected FIBER position and
the old result will be discarded.
- CABLE + FIBER
CABLE 001
FIBER 004
STORED : 003
- FIBER + SAVE
CABLE 001
FIBER 004
STORED : 003
- FIBER + SAVE
CABLE 001
FIBER 001
!
STORED : 003