ComSonics OMM Series User manual

User Manual
Optical Multimeter
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OMM Series
User Manual
Document No.: UM-OMM-2 Rev. A
File Name: OMM Series Optical Multimeter User Guide
Draft
Confidential
i
Disclaimer
Copyright © 2016–2017 © ComSonics Inc. All rights reserved.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or
by any means, electronic, mechanical, photographic, magnetic, or otherwise, without the prior written
permission of ComSonics, Inc.
ComSonics reserves the right to alter the equipment specifications and descriptions in this publication
without prior notice. No part of this publication shall be deemed to be part of any contract or warranty
unless specifically incorporated by reference into such contract or warranty. The information contained
herein is merely descriptive in nature and does not constitute a binding offer for sale of the product
described herein. ComSonics assumes no responsibility or liability arising from the use of the products
described herein, except as expressly agreed to in writing by ComSonics. The use and purchase of this
product do not convey a license under any patent rights, copyrights, trademark rights, or any intellectual
property rights of ComSonics. Nothing hereunder constitutes a representation or warranty that using any
products in the manner described herein will not infringe any patents of third parties.
(The exclusion of implied warranties may not apply in all cases under some statutes, and thus the above
exclusion may not apply.)
Specifications are subject to change without notice. Every attempt has been made to make this manual
complete, accurate, and up-to-date. Readers are cautioned, however, that ComSonics reserves the right to
make changes without notice and shall not be responsible for any damages, including indirect, incidental or
consequential damages, caused by reliance on the material presented, including, but not limited to,
omissions, typographical, arithmetical, or listing errors in the material.
When you work with this equipment, take the following precautions:
Use of controls or adjustments or performance of procedures other than those specified herein may result
in hazardous radiation exposure.
Never look at an optical fiber using a direct magnification fiber scope without verifying that all laser
sources on the fiber are turned off.
Never look directly into an optical connector.
Install protective covers or caps over connectors when they are not being used. Always assume that
exposed optical connectors and cables are energized.
Always make an optical power measurement of the fiber or connector before cleaning to ensure the cable
and connector are not energized.

OMM Series
User Manual
Document No.: UM-OMM-2 Rev. A
File Name: OMM Series Optical Multimeter User Guide
Draft
Confidential
ii
Document History
Revision
Document Number
Description
Date
A
OMM-2
Initial release.
10/08/2018
Documentation Conventions
This manual uses some special symbols and fonts to call your attention to important information. The
following symbols appear throughout this manual:
DANGER: The Danger symbol calls your attention to information that, if ignored, can cause
physical harm to you
CAUTION: The Caution symbol calls your attention to information that, if ignored, can
adversely affect the performance of your ComSonics product, or that can make a procedure
needlessly difficult.
LASER DANGER: The Laser symbol and the Danger alert call your attention to information
about the lasers in this product that, if ignored, can cause physical harm to you.
DC
Recycle.
Comply WEEE (Waste Electrical and Electronic Equipment) Directive (2002/96/EC)
NOTE: The Note symbol calls your attention to additional information that you will benefit
from heeding. It may be used to call attention to an especially important piece of information
you need, or it may provide additional information that applies in only some carefully
delineated circumstances.

OMM Series
User Manual
Document No.: UM-OMM-2 Rev. A
File Name: OMM Series Optical Multimeter User Guide
Draft
Confidential
iii
Table of Contents
CHAPTER 1 DESCRIPTION AND FUNCTION OF COMPONENTS.......................................................................... 1
1.1 INVENTORY...................................................................................................................................................1
1.2 FEATURES.....................................................................................................................................................1
1.3 DESCRIPTION ................................................................................................................................................1
CHAPTER 2 OPERATION .................................................................................................................................. 5
2.1 PERFORM OPTICAL POWER TEST ..................................................................................................................5
2.2 TWIN MODE ................................................................................................................................................5
2.3 PERFORMING A FIBER LOSS TEST .................................................................................................................6
CHAPTER 3 PC CONFIGURATION UTILITY......................................................................................................... 7
3.1 INSTALLATION ..............................................................................................................................................7
3.2 USE...............................................................................................................................................................7
CHAPTER 4 MAINTENANCE ............................................................................................................................. 8
4.1 BATTERY CHARGING ....................................................................................................................................8
4.2 BATTERY REPLACEMENT..............................................................................................................................8
4.3 STORAGE ......................................................................................................................................................8
CHAPTER 5 SPECIFICATIONS............................................................................................................................ 9

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
1
Chapter 1 Description and Function of Components
1.1 Inventory
1.1.1 OMM Kit includes the following items:
A. Optical Multimeter
B. User Manual
C. USB Cable
D. Carrying Case
E. Charging Adapter
F. 2 1.5VDC AA Batteries
1.2 Features
A. High performance Optical Power Meter
B. Interchangeable connectors
C. Measures six different wavelengths
D. Laser light source output on two or three wavelengths
E. Auto-off function saves battery life
F. Stores up 1000 measurements
G. Measurements transferable to PC based software
1.3 Description
1.3.1 Meter (Refer to Figure 1-1)
Figure 1-1
1. Laser output connector with protective cap
2. Power meter input connector with protective cap
3. LCD (See figure 1-2)
4. Keypad (See figure 1-3)
5. Bottom and back panels (See figure 1-4)

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
2
1.3.2 LCD (Refer to Figure 1-2)
Figure 1-2
1. Wavelength currently being measured
2. Reference Indicator: Displays current reference setting
3. Modulation Indicator: Displays modulated CW signal. If none of the tones are shown on the
display, then they are all off.
4. TWIN mode indicator
a. “Single” = Auto wavelength detection off
b. “TWIN” = Auto wavelength detection on
5. Saved data set number currently displayed.
6. USB Indicator
7. AC Adapter indicator
8. Battery level/charge indicator
9. Current power meter measurement
10. Units of measurement
11. Auto-Off indicator

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
3
1.3.3 Key Pad (Refer to Figure 1-3)
Figure 1-3
1. Laser source output wavelength LEDs
a. Indicates current output wavelength.
b. No LEDs lit indicate laser source output is off.
2. Laser source output wavelength selector key. LD = Laser Diode
a. Press to cycle between wavelengths
3. Power meter input wavelength select key. PD = Power Diode
a. Press to cycle between wavelengths: 850, 1300,1310, 1490,1550,1625 nm
b. This key also functions to delete stored measurements. When the device is in the “load”
mode which displays stored measurements, a single push of this button will delete the
current data file shown on the screen.
c. To delete ALL data files at once, press and hold for >2 seconds. The meter must be in
the load mode where the stored measurements are shown for this function to work.
4. Load key
a. Short press to enter “Load” mode. Displays stored measurements 1-999. Use the up and
down keys (dBm/db/mW, backlight) to select the desired file to view measurements.
Note: This button does not load the stored values. It is a recall/view function only.
b. Long press (> 2 Seconds) to save the current power meter measurement and wavelength.
If the input signal is too “Lo” to measure, no data will be stored.
5. Twin Mode key
a. Press to cycle Power Meter between Single and Twin modes
i. “Single” on display = Auto wavelength detection off
ii. “TWIN” on display = Auto wavelength detection on
6. Laser source output modulation tone LEDs
a. Indicates current Laser source output modulation tone
b. No LEDs lit indicates CW mode
7. CW/Hz Modulation Select
a. Press to cycle between CW Laser source modulation frequencies

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
4
8. Reference Key
a. Short press momentarily displays the current reference value
b. Long press (> 2 seconds) sets current Power Meter measurement as the reference level.
Two beeps will sound when the reference level has been set and will display dB units.
When the reference value is set, it is only applied to the current wavelength. Individual
reference values for each wavelength can be set and stored separately. After a reference
value has been set and each time the wavelength is selected on the power meter, the
measurement will use the correct reference offset automatically. The offset is shown in
dB. To get the absolute power measurement, press the dBm/dB/mW key until the
measurement in dBm is shown.
Note: Deleting all of the stored values will not delete the reference measurements.
9. Power key
a. Short press until beep sounds to power on with auto-off function Active
b. Long press (>2 Seconds after beep) when powering on Disables auto-off function
c. Meter will display “auto-off” when function is enabled.
10. Unit of Measure selector key
a. Press to cycle between dBm, dB and mW. dBm units will always display the absolute
measurement value. dB units will show the delta between the absolute measured value
and the stored reference level. For example: The measured power value is 5 dBm. The
Reference value has been set to 4 dBm. The delta between the measured value and the
reference level will be 1dB.
b. In “Load” mode, this key will function as the up arrow key to numerically cycle through
stored measurements: 1, 2, 3 …
11. Backlight key
a. Press to cycle display backlight on and off
b. In “Load” mode, this key will function as the down arrow key to numerically cycle
through stored measurements: 3, 2, 1 …
1.3.4 Bottom and Back Panel (Refer to Figure 1-4)
1. Kickstand
2. Battery compartment cover with locking mechanism
3. DC Power jack
4. Charging LED
a. Flashing red indicates charging
b. Green indicates full charge
5. USB Port
Figure 1-4

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
5
Chapter 2 Operation
WARNING:DO NOT LOOK INTO OPTICAL OUTPUT PORTS OR FIBER CONNECTORS
WHEN ENERGIZED.INVISIBLE LASERS MAY CAUSE PERMANENT EYE DAMAGE.
NOTE: Clean all fiber connections before connecting to meter and before reconnecting
fibers to network. Dirty connections may cause incorrect measurements and affect network
performance.
2.1 Perform Optical Power Test
The OMM Series meters may be used to perform optical power measurements at any point within the
fiber network. To perform the test:
1. Clean the OMM fiber connector.
2. Disconnect fiber to be tested from the network. Clean connectors.
3. Connect fiber to be tested to OMM fiber connector.
4. Turn on the OMM by pressing the power key.
5. Press the Power Meter wavelength key until the desired wavelength to be measured is displayed.
6. Optical power level will be displayed.
7. If measurement is to be saved, press and hold the Load key for > 2 seconds.
a. File name/number will be displayed briefly at bottom center of display.
8. Turn off the meter.
9. Disconnect the tested fiber, clean connections, and reconnect to fiber network.
2.2 TWIN Mode
When the ComSonics’OLS in the multimeter is paired with a ComSonics’OPM, they can be operated in
Twin Mode. This allows the OLS in the multimeter to send a coded message to the OPM indicating the
correct wavelength. To activate Twin Mode:
1. Connect the fiber to be tested to the Laser source output connector on the OMM.
2. Connect the optical power meter to be used to the opposite end of the cable to be tested.
3. Set the desired output wavelength using the OMM Laser source output selector key.
4. If desired, the CW modulation can be used to identify the correct fiber first; however, once the
TWIN key is pushed, the tone will be disabled. A modulated tone and the TWIN functionality
cannot operate at the same time.
5. Press the OMM TWIN key.
6. Place the OPM in use in the TWIN mode.
a. The wavelength of the Laser Source output will be displayed in the top left corner of the
OPM display.
b. The “TWIN” symbol will also appear on the LCD screen of the OPM
7. Change the OMM laser source wavelength to perform all tests required. Changing the laser
source wavelength will automatically update the corresponding settings on the power meter.

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
6
2.3 Performing a Fiber Loss Test
An important part of certifying a newly constructed fiber network is performing a Fiber Loss Test. This
test confirms the loss in the segment of fiber being tested is within acceptable limits. The test is
performed by connecting a Laser Source at one of the fiber to be tested inserting a signal at a known
level. A power meter is connected at the other end of the fiber and the Power is measured. The measured
loss through the fiber must fall within the loss budget specified in the network design. A Fiber Loss Test
may also be performed when a new reel of fiber optic cable is received to ensure it was not damaged in
shipment and meets minimum performance standards. To perform a Fiber Loss Test with an OMM Series
meter do the following steps:
1. Set the Reference level on the OMM if it is used as the Power Meter
a. Connect the OMM power meter input and the optical laser source (OLS) with a short
jumper.
b. Configure the output of the optical laser source to the desired wavelength and power
output.
c. On the OMM, press and hold the Reference Key. Two beeps will sound and the display
will indicate 0.00dB. This provides a “Reference” level that will allow the power meter
to measure signal level differences when measuring fiber loss.
2. Repeat these steps for all wavelengths to be tested while ensuring the laser source and OMM are
always on the same wavelength. This is where the TWIN functionality can ensure this is done
correctly.
3. Connect the Optical Laser Source to one end of the fiber to be tested
4. Connect the OMM power meter input connector to the other end of the fiber to be tested.
5. The measurement displayed (in dB) will be the loss through the fiber under test.
6. If the test result is to be saved/documented, press and hold the Load key on the OMM for > 2
seconds. The file name/number will be displayed briefly at the bottom of the display.
7. If additional wavelengths are to be tested, repeat process starting with Step 1 to reset the
reference level with new wavelength. For tests done when the ends of the fiber are at different
locations, set and store a reference level for each wavelength first. The meter will automatically
store the correct reference level for each wavelength and recall it whenever the wavelength is
selected.
Note: The OMM can also be used as the Optical Laser Source. In this scenario, a separate power meter
will be required to run the loss tests. If testing is being done on a fiber spool and separate locations are
not required, the OMM can be used as both the OLS and OPM, thus eliminating the need for two separate
devices.

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
7
Chapter 3 PC Configuration Utility
3.1 Installation
1. Download the Meter Data Manager.msi file from www.Comsonics.com.
2. Double-click on the downloaded file to install.
3.2 Use
NOTE: Refer to Figure 3-1 in the following steps.
1. Double-click on the shortcut created during the installation to open the application.
CAUTION:
If non-rechargeable batteries are installed in the meter, remove before connecting to PC to
prevent charging.
2. Connect the OMM to the PC using a mini-USB cable and power on. If non-rechargeable batteries
have been removed, OPM will operate on USB power. NOTE: The first time an OMM series
meter is connected a USB driver will be installed.
3. A USB logo will be displayed on the meter LCD.
4. If desired, the company name, user name and notes may be entered in the applicable boxes. This
information will be linked to measurements transferred to the PC in the following step. It will be
included in saved data and printed reports.
5. Click the “Upload” button to transfer measurements stored in the OPM meter to the PC.
6. Click the “Save” button to save the uploaded measurements in a comma separated values (CSV)
file format.
7. Click the “Clear” button to clear measurements from meter.
8. Click the “Print” button to print a report of the saved measurements.
9. Click the “Preview” button to preview the report of the saved measurements.
10. Click the “Help” button to access the softer specific user guide.
11. Click the “Exit” button to exit the application.
Figure 3-1

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
8
Chapter 4 Maintenance
4.1 Battery Charging
WARNING: Do not attempt to charge nonchargeable AA batteries.
1. Use only the supplied 6 VDC Charging adapter to charge batteries.
2. Plug charging adapter into 6 VDC port on bottom of meter.
3. Do not overcharge batteries.
4.2 Battery Replacement
OMM Series meters operate on two 1.5 VDC “AA” batteries. Two rechargeable batteries and an AC
charging adapter are supplied with the meter. The rechargeable batteries may be replaced with standard
1.5 VDC AA batteries.
To replace the batteries:
1. Use a common screwdriver to turn the battery compartment lock ¼ turn counter-clockwise.
2. Lift the compartment panel off using the kickstand.
3. Remove old batteries.
4. Install new batteries. Ensure polarity is correct.
5. Reinstall cover and turn locking mechanism ¼ turn clockwise to lock.
4.3 Storage
OMM Series meters should not be stored in extreme high or low temperatures. Store in a clean, dry
location. If device is to be stored for an extended period remove the batteries and store separately.

OMM Series
User Manual
Document No.: UM-OPM-2 Rev. A
File Name:OPM-2 Optical Power Meter User Guide Draft
Confidential
9
Specifications
Model
FHM2A01
FHM2B01
FHM2A02
FHM2B02
Power Meter Parameters:
Calibration Wavelength
850/1300/1310/1490/1550/1625nm
Connector
Interchangeable FC/SC (ST optional)
Data Storage
999 measurements
Ref.Value
Yes
Display Units
dB/dBm/mW
Display Precision
0.01dB
Accuracy
±5%±1nW
Wavelength Recognition
1310/1490/1550 (input power≥-40dBm)
Tone Detection
270Hz/1KHz/2KHz (input power≥-40dBm)
Measuring Range
-70 to
+10dBm
-50 to
+26dBm
-70 to
+10dBm
-50 to
+26dBm
Laser Source Parameters:
Output Wavelength
1310/1550nm
1310/1490/1550nm
Connector
fixed FC/PC (interchangeable FC/SC/ST customized)
Modulation Frequencies
270Hz/1KHz/2KHz
Output Power
-5dBm±0.5dB
Stability Long-term (8h)
±0.1dB@1310/1550nm
±0.1dB@1310/1550nm; ±
0.2dB@1490nm
Stability Short-term(15min)
±0.05dB@1310/1550nm
±0.05dB@1310/1550nm; ±
0.1dB@1490nm
Wavelength Recognizing Code
Yes
Auto Power off
Yes
General
Power Supply
2pcs*NiHM 1.2V, 2000mAh; AC/DC Adapter
PC Interface
USB
Battery Life
>100 hours (laser off)
Storage Temperature
-20℃~+70℃
Operating Temperature
-10℃~+50℃
Relative Humidity
<90% (Non-condensing)
Dimension
168mmL×76mmW×43mmH
Weight
310g