Keynet Systems OPM-71PC User manual

User's Guide to the OPM-71PC
Optical Power Meter
English Version
OPM-71PC
Keynet Systems

User's Guide to the OPM-71PC
Optical Power Meter

CONTENTS PAGE
1 Introduction
2 Warranty
2.1 Two Years Limited Warranty
2.2 Exclusions
2.3 Returning Product
2.4 Contacting us
3 Safety Information
4 Preparing for Operation
4.1 Unpacking the instrument
4.2 Discharged batteries
4.3 AC operation
5 Operation
5.1 Display and controls
5.2 Turning the instrument on and off
5.3 Setting the wavelength
& Activate the Auto-wavelength Recognition(TWIN)
5.4 Switching measurement mode
5.5 Setting reference level
5.6 Swithing backlighting of the LCD on and off
5.7 Frequency detecting
5.8 The overflow of the measured power value
5.9 The storage of the current test value
5.10 Check the storage records
6 Specifications
7 Maintenance
1
2
4
5
8
19
21

1
OPM-71PC / Introduction
1 Introduction
The OPM-71PC series are full featured palm sized optical
power meters designed for use with an optical laser source
to perform optical loss measurements on optical fiber
cables. The series are lightweight and are
controlled by microprocessor. Utilizing state-of-the-art SMT
in its manufacture, optical connections to the
are made via the universal adapter interface on the top of
the unit. The instrument has 7 working wavelengths to
totally satisfy your needs.
It can be extensively used in telecommunication projects
and other situations where optical power of wavelengths
close to infrared ray needs to be measured.
OPM-71PC
OPM-71PC
LPM-4 series
AUTO-OFF
270Hz
1kHz
2kHz
.8.8.8.8
REF
1888
-
nm
FHP2 series
FH

2
OPM-71PC / Warranty
2 Warranty
Two Years Limited Warranty
Keynet products are warranted against the defective components and workmanship for a period of
two years from the date of delivery to the original customer. Any product found to be defective within
the warranty period would be returned to authorized service center for repair, replacement
and calibration.
Exclusions
The warranty on your equipment shall not apply to defects resulting from the following:
Unauthorized repair or modification
Misuse, negligence, or accident
Returning Product
To return product, you may contact Keynet to obtain additional information if necessary.
To serve you better, please specify the reasons for the return.
All delivery and mails should be sent to the following address:
Keynet
Together with approved RMA.

3
OPM-71PC / Warranty
Keynet Systems
Calle F Oeste nº56, Pol. Ind. Malpica
50016 Zaragoza(Spain)
Contact Us
Tel: [phone]
E-mail: [email protected]
Website: www.keynet-systems.com

4
OPM-71PC / Safety Information
3 Safety Information
Never look directly into optical outputs or a fiber while the equipment is on.Invisible laser beam
may damage your eyes.
Do not short-circuit the terminal of AC adapter / charger and the batteries.Excessive electrical
current may cause personal injury due to fumes,electric shock or equipment damage.
Connect AC power cord with the equipment and wall socket properly. While inserting the AC plug,
make sure there is no dust or dirt on the terminals and both plugs are fully seated. Incomplete
engagement may cause fuming, electric shock or equipment damage and may result in personal
injury.
Do not operate the equipment near hot objects, in hot environments, in dusty/ humid atmosphere
or when condensation is present on the equipment. This may result in electric shock , product
malfunction or poor performance.
Warnings!

5
OPM-71PC/ Preparing for Operation
4 Preparing for Operation
4.1 Unpacking the instrument
Packing material
We suggest that you keep the original packing material. Using the original packing material is your
guarantee of protecting the instrument during transit.
Checking the package contents
The standard accessories of OPM-71PC are as follows:
FC/PC,SC/PC interchangeable connector, Manual, Carrying Bag, Software (CD), USB cable, AC/DC
adapter, Test Report.
Checking for damage in transit
After unpacking the instrument, check to see whether it was damaged in transit. This is particularly likely
if the outer casing is clearly damaged. If there is damage, do not attempt to operate the instrument or to
repair it without authorization. Doing so can cause further damage and you may lose your warranty
qualification.

6
4.2 Discharged batteries
There is a battery indicator on the screen to show the remaining charge. There are four possibilities the
indicator may show, full, with 2 blacks, with 1 black and empty. If an empty battery indicator flashes it
means the power is almost out, and that is when you should recharge the batteries by connect the AC
adapter with the instrument. If the discharged batteries get to their limitations after long-time use,
please replace it with a new one. To replace the batteries, please remove the battery plate on the back
of instrument with a screwdriver.
When the battery charge is extremely low to supply the necessary power, the instrument will
automatically switch off.
Note: 1 The AC indicator is not displayed when power is supplied by battery.
2 To eliminate the possibility of acid leakage, please take out the battery if the unit is not used for a long
time.
OPM-71PC / Preparing for Operation

7
4.3 AC operation
If the instrument is mainly used at one location, e.g. in a laboratory or test department, the AC adapter
can be used to power it instead of batteries. There is a DC input jack on the bottom of the OPM-71PC
instrument casing into which the output cable of the AC adapter is plugged. And when the AC adapter is
plugged in, the Charging Indicator on the LCD will be displayed.
Note:
1 Power is supplied by the AC adapter even if battery is fitted. And the battery indicator is not displayed
on the screen when AC adapter is plugged.
2 Make sure that the operating voltage of the AC Adapter / Charger is the same as the local AC line
voltage.
OPM-71PC/ Preparing for Operation

8
OPM-71PC / Operation
5 Operation
5.1 Display controls
5.1.1 Keypad
The OPM-71PC keypad is used to access a wide range of instrument functions.
and
Switches instrument on / off. Long keypress while powering on to
activate the instrument without Auto-off function.
NO. Key Function
1
2
3
4
5Short keypress to display reference level of present test wavelength.
Long keypress to set a new reference level of present test wavelength.
Long keypress for 2s to store the current test value; short keypress to
display the record.
LPM-4 series
AUTO-OFF
270Hz
1kHz
2kHz
.8.8.8.8
REF
1888
-
nm
FHP2 series
FH
Switches backlighting on / off.
6
Switches measurement unit among dBm,dB and mw.
Selects measurement wavelength in sequence of 850/1300/1310/
1490/1550/1625/1650nm and to activate auto-wavelength
recognition(TWIN).
5
6

9
OPM-71PC / Operation
5.1.2 Back
Connector(FC/PC, FC/SC optional)
Micro-USB interface
LPM-4 series
AUTO-O FF
270Hz
1kHz
2kHz
.8.8.8.8
REF
1888
-
nm
FHP2 series
FH

AUTO-OFF
270Hz
1kHz
2kHz
.8.8.8.8
REF
1888
-
nm
Wavelength
Reference
Frequency Measurement Unit
Power
Auto-off
Battery Charge
Charging Indicator
10
5.1.3 LCD
OPM-71PC / Operation
TWIN
Auto-wavelength recognition

11
5.2 Turning the instrument on and off
Press the “ON/OFF” key briefly.
The instrument powers on, and backlighting switches on.
Please check the battery capacity if it fails.
Press the “ON/OFF” key briefly again.
The instrument powers off, and backlighting switches off.
Note: Auto-off function
1. The instrument powers off automatically if no keypress in 10 minutes.
2. Press the “ON/OFF” key for about 2 seconds to power on the instrument with “Auto-off”
function deactivated.
AUTO-OFF
270Hz
1kHz
2kHz
.8.8.8.8
REF
-
OPM-71PC / Operation

12
5.3 Setting the wavelength & Activate the Auto-wavelength Recognition(TWIN)
Press the “λ” key repeatedly until the desired wavelength is
displayed. You can select from six possible wavelengths:
850nm, 1300nm, 1310nm, 1490nm,1550nm,1625nm.
The instrument defaults to the wavelength which the user set
in the last test.
When used with the OPM-71PC Series optical laser source,
the wavelength will shift automatically according to the output
wavelength of the laser source. Long keypress is to
activate the auto-wavelength recognition and the "TWIN" will
show on the LCD. Short keypress is to close the "TWIN".
.
AUTO-OFF
2 0.0 0
13 1 0
-
nm
1490
850 1300
15501625
OPM-71PC / Operation
AUTO-O FF
25.98
13 10
nm
-
AUTO-O FF
25.98
13 10
nm
-
TWIN

13
5.4 Switching measurement mode
There are three measurement modes you can choose by pressing the “dBm/dB/mW” key
repeatedly, dB, dBm,mW.
AUTO-OFF
2 5.0 8
1 3 1 0
nm
AUTO-OFF
2 0.0 0
1 3 1 0
nm
-
OPM-71PC / Operation

14
5.5 Setting reference level
1. Press the “REF” key to display the stored reference level for
the current wavelength and a sign of “REF” will be displayed
on the screen to indicate that it is a reference value. The
displayed value only lasts 1 second.
2. Press and hold the “REF” key over 2 seconds to store the
presently measured value as the new reference level for the
current wavelength. During the process the “REF” sign
flashes twice on the screen and buzzer sound is heard. Once
the new reference level is set, the switches to the
dB measurement mode. The displayed value only lasts 1
second.
OPM-71PC
AUTO-OFF
0 5.8 8
1 3 1 0
nm
AUTO- OF F
2 0.0 0
REF
1 3 1 0
-
nm
OPM-71PC / Operation
AUTO-OFF
270Hz
1kHz
2kHz
.8.8.8.8
REF
1888
-
nm

15
5.6 Switching backlighting of the LCD on and off
Press the backlighting key.
Backlighting switches on.
Press the backlighting key again.
Backlighting switches off.
AUTO-OFF
5.0
1 310
-
nm
AUTO-OFF
5.0
1 310
-
nm
OPM-71PC / Operation

16
5.7 Frequency detecting
If the tested wavelength is carrying a tone of 270Hz, 1kHz, or 2kHz, the respective
frequency indicates on the screen
AUTO-OFF
2 0.0 0
13 1 0
-
nm
1kHz
OPM-71PC / Operation

17
5.8 The overflow of the measured power value
If the measured power value is too high, the LCD screen will display “HI”.
If the measured power value is too low, the LCD screen will display “LO”.
AUTO-OFF
1 3 1 0
nm
AUTO-OFF
L 0
1 3 1 0
nm
OPM-71PC / Operation