OPTOKON OFT-920 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, [email protected]Z
s/w: 3.2
09/12/2016
OFT-920
Ruggedized Optical Loss Test
Set
USER MANUAL
Revision 3.2

OFT-920 USER MANUAL
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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
[e-mail]

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Content
1Introduction.................................................................................................. 4
2Features........................................................................................................6
3Application ....................................................................................................6
4Accessories ...................................................................................................6
4.1 Standard........................................................................................................................6
4.2 Options:........................................................................................................................6
5Specifications ................................................................................................7
5.1 Light Source.................................................................................................................7
5.2 Power Meter.................................................................................................................7
5.3 Loss Test Set ................................................................................................................7
6Safety information......................................................................................... 8
7Maintenance.................................................................................................. 9
7.1 Battery care and replacement.......................................................................................9
7.2 Instrument care...........................................................................................................11
7.3 Optical connector care................................................................................................11
8Button function description........................................................................... 12
8.1 Menu #1 .....................................................................................................................13
8.2 Menu #2 .....................................................................................................................14
8.3 Menu #3 .....................................................................................................................15
8.4 Menu #4 .....................................................................................................................16
8.5 Menu #5 .....................................................................................................................17
SAVE RESULT ...................................................................................................................17
LOAD RESULT...................................................................................................................17
UPLOAD MEMORY...........................................................................................................18
9Measuring loss............................................................................................. 19
9.1 Basic theory................................................................................................................19
9.2 Method 6 - two instruments .......................................................................................20
9.2.1 Setting the reference .........................................................................................20
9.2.2 Measuring Loss.................................................................................................21
9.3 Method 6 - one instrument.........................................................................................22
9.3.1 Setting the reference .........................................................................................22
9.3.2 Measuring Loss.................................................................................................23
9.4 Method 7 - two instruments .......................................................................................24
9.4.1 Setting the reference .........................................................................................24
9.4.2 Measuring Loss.................................................................................................25
9.5 Method 7 - one instrument.........................................................................................26
9.5.1 Setting the reference .........................................................................................26
9.5.2 Measuring Loss.................................................................................................27
10 Ordering information .............................................................................. 28
10. Setting up data transfer.......................................................................... 29
11. Power loss and decibels.......................................................................... 32
12. Notes..................................................................................................... 33
13. Calibration, service center....................................................................... 36

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1Introduction
The OFT-920 optical test set is designed for testing optical networks terminated with
connectors operating in harsh environments. It combines both a light source and
optical power meter in one common box. The OFT-920 test set is designed to meet
the tactical military and broadcast industry demand. The ruggedized aluminum case
makes the unit ideal for field operation.
General description:
-front view

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-top view:
-rear view:

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2Features
Expanded Beam and ferrule harsh environmental connectors
Ruggedized aluminum case
Multimode (MM) or single mode (SM) applications
Simultaneous testing of all 2/4 fibers
Internal memory: up to 2000 measurements
Displayed units: dBm, dB
High dynamic range
Up to 4 light source combinations
Built-in charger, battery status indicator
Easy to use with menu navigation
3Application
Optical network measurements
Fiber continuity testing
4Accessories
4.1 Standard
Power charging adaptor
Soft carrying case
USB Cable
Cleaning swabs
4.2 Options:
Reference patchcord

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5Specifications
5.1 Light Source
Light Source:
Output power
Note:
LD 850 nm, LED 850, 1300 nm
-26 dBm (62.5/125 µm fiber)
LD 1310, 1490, 1550, 1625 nm
-16 dBm
typ. value
Stability (1 hour, delta/2):
tested after 20 min warm up
temperature 23 ± 1°C
LD 850 nm, LED 850, 1300 nm
± 0.03 dB
LD 1310, 1490, 1550, 1625 nm
± 0.05 dB
5.2 Power Meter
Power Meter:
Photo detector
InGaAs
Working
wavelengths
Multimode: 850, 1300 nm
Singlemode: 1310, 1490, 1550, 1625 nm
can be customized
Uncertainty
± 12%
1310, 1550 nm @ -20 dBm
Resolution
0.1
Dynamic range -55 dBm to +10 dBm
-53 dBm to +17 dBm
1300, 1310, 1490, 1550, 1625
nm
850 nm
5.3 Loss Test Set
Optical Test Set
Dimensions
145 x 145 x 56 mm
without connectors
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
> 20 hrs
One source operation
Battery life time
> 2 years (1000 cycles)

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6Safety information
This equipment 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, as long
as magnifying devices are not used.
It is the responsibility of the user to gain adequate training and familiarity
with the relevant safety issues and work practices before using this
equipment.
WARNING!
•Never use magnifying devices to inspect optical fiber ends unless you are sure
that no optical power is being emitted.
•Use only 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
permanent eye damage can result.
•Avoid direct exposure to the beam.
•Do not activate the laser when there is no fiber attached to the optical output
connector
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.

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7Maintenance
7.1 Battery care and replacement
OFT-920 is equipped with a charger and powered by built-in, three-cell, NiMH battery
pack. Rated voltage is 3.6 V, recommended capacity is 800 [mAh] (for 20 hrs
operation). Use only the charger supplied by OPTOKON (DC 5 V, USB connector).
Recommended charge time is 12 to 14 hours. For replacement of the battery must
be removed bottom cover (by losing 4 screws under rubber covers):

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After opening disconnect battery connector and remove battery pack:
Insert new battery and connect the battery connector (be careful for polarity). Take
back the bottom panel, tighten all screws and insert back the rubber covers.