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MBR5 Multi-Output
Backreflection Meter
User Manual
All information contained herein is believed to be accurate and is subject to
change without notice. No responsibility is assumed for its use.
 JGR Optics Inc, 2016.
MBR5 User Manual
TABLE OF CONTENTS
COMPLIANCE ............................................................................................................1
FDA-CDRH COMPLIANCE .....................................................................................................1
CSA / IEC COMPLIANCE........................................................................................................1
ENCIRCLED FLUX (IEC 61280-4-1) COMPLIANCE..................................................................1
COMPLIANCE .........................................................................................................................2
FCC CERTIFICATION .............................................................................................................2
GENERAL INFORMATION ......................................................................................3
MBR5 BACKREFLECTION METER OVERVIEW...........................................................................3
MEASUREMENTS ....................................................................................................................4
Backreflection Measurement ..................................................................................4
Loss and Power Measurement ...............................................................................4
OUTPUT PORT .......................................................................................................................5
HYBRID JUMPERS ..................................................................................................................5
COHERENCE LENGTH .............................................................................................................5
KEY FEATURES ......................................................................................................................6
APPLICATIONS .......................................................................................................................6
ACCESSORIES ........................................................................................................................6
OPTIONAL ACCESSORIES .......................................................................................................6
SAFETY INFORMATION ..........................................................................................7
SAFETY MARKINGS ON THE UNIT ...........................................................................................7
CLASSIFICATION ....................................................................................................................8
LASER SPECIFICATIONS .........................................................................................................8
SAFETY INSTRUCTIONS ..........................................................................................................9
Laser Hazards ...........................................................................................................9
Electrical Shock Hazards .........................................................................................9
GETTING STARTED ................................................................................................11
INITIAL INSPECTION ............................................................................................................11
OPERATIONAL REQUIREMENTS .............................................................................................12
PRODUCT OVERVIEW ...........................................................................................................12
Front Panel and Key Description ..........................................................................12
Rear Panel ...............................................................................................................13
OPERATION .............................................................................................................15
POWERING UP THE METER ..................................................................................................15
BACKREFLECTION MEASUREMENTS .......................................................................................15
Set-up for BR Measurements ...............................................................................16
Measuring BR0........................................................................................................16
Measuring BR (Including Connector) ..................................................................17
Measuring BR (Excluding the Connector) ...........................................................19
Backreflection Accuracy and Range ....................................................................20
LOSS AND POWER MEASUREMENTS ......................................................................................21
Set-Up for Loss and Power Measurements ........................................................21
Dark Current Measurement ..................................................................................22
Measuring Power ....................................................................................................22
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Measuring Relative Power (Insertion Loss) ....................................................... 23
Power Accuracy ..................................................................................................... 24
DUAL DISPLAY MODE ......................................................................................................... 24
TERMINATION TECHNIQUES ................................................................................................ 25
Mandrel Wrap Technique (for Single-mode Fiber) ........................................... 25
Index-Matching Technique (for Multimode Fiber) ............................................ 26
USER MENU OPERATION ..................................................................................................... 27
Accessing the User Menu ..................................................................................... 27
Navigating the User Menu .................................................................................... 27
COMPATIBILITY WITH JDSU RM3 OR RX3 METERS ............................................................ 28
MESSAGES AND SYMBOLS.................................................................................................... 30
CALIBRATION ..................................................................................................................... 31
Calibration Period .................................................................................................. 31
PROGRAMMING GUIDE ....................................................................................... 32
SETTING UP FOR RS-232, USB OR GPIB COMMUNICATION ................................................ 32
Accessing the “User Menu” mode ....................................................................... 32
JDSU Compatibility ................................................................................................ 32
Programming over GPIB ....................................................................................... 32
Programming Over RS-232 .................................................................................. 32
Programming Over USB........................................................................................ 33
MAINTENANCE AND TROUBLESHOOTING ..................................................... 34
MAINTENANCE .................................................................................................................... 34
Cleaning the Unit ................................................................................................... 34
Cleaning the Connector Ends .............................................................................. 34
Cleaning Jumper Connectors ............................................................................... 36
TROUBLESHOOTING ............................................................................................................ 37
Connector Issues ................................................................................................... 37
MBR5 Calibration Issues ....................................................................................... 37
Loss and Reflection issues ................................................................................... 38
Long Cables (for single-mode model only) ........................................................ 39
Laser Stability......................................................................................................... 39
STORAGE AND SHIPPING ................................................................................... 41
RETURNING INSTRUMENTS TO JGR OPTICS......................................................................... 41
CONTACT INFORMATION ..................................................................................................... 42
SPECIFICATIONS .................................................................................................. 43
REMOTE CONTROL COMMANDS ........................................................................ 44
COMMAND SYNTAX AND STYLE ............................................................................................ 44
Program Message Formats .................................................................................. 44
Terminating a Program Message ........................................................................ 44
Command Header Variations ............................................................................... 44
Specifying the Command Path ............................................................................ 45
Default Commands ................................................................................................ 45
Implemented Status Structures .......................................................................... 46
QUEUES ............................................................................................................................. 48
Input Queue ........................................................................................................... 48
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Output Queue .........................................................................................................49
Error Queue ............................................................................................................49
DESCRIPTION OF ERROR NUMBERS ......................................................................................49
IEEE 488.2 COMMON COMMANDS AND THE SCPI COMMAND TREE .....................................50
IEEE 488.2 Common Commands .........................................................................50
SCPI Command Tree .............................................................................................51
DESCRIPTION OF INDIVIDUAL COMMANDS ............................................................................52
IEEE-488.2 Common Commands .........................................................................52
SCPI Commands .....................................................................................................56
JGR Legacy Device Specific Commands .............................................................63
JGR Legacy Device-Specific Command Description ..........................................63
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1
COMPLIANCE
FDA-CDRH Compliance
Under the US Food and Drug Administration (FDA) Center for Devices and
Radiological Health (CDRH), the unit complies with the Code of Federal
Regulations (CFR), Title 21, Subchapter J, which pertains to laser safety and
labeling. See the link below for more information.
•
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CF
RPartFrom=1000&CFRPartTo=1050
CSA / IEC Compliance
The unit complies with certain standards of the Canadian Standards Association
(CSA) and the International Electrotechnical Commission (IEC).
The unit falls in the Installation Category (Overvoltage Category) II under IEC 664.
IEC 664 relates to impulse voltage levels and insulation coordination. The
particular category is defined as: local level, appliances, portable equipment, etc,
with smaller transient overvoltages than Installation Category (Overvoltage
Category) III.
The unit falls in the Pollution Degree 2 category under IEC 1010-1 and CAN/CSAC22.2 No. 1010.1. The IEC standard on Safety Requirements for Electrical
Equipment for Measurement, Control, and Laboratory Use relates to insulation
coordination. The CSA standard is on Safety Requirements for Electrical
Equipment for Measurement Control, and Laboratory Use, Part I: General
Requirements. The Pollution Degree 2 category is defined as follows: “Normally
only non-conductive pollution occurs. Occasionally, however, a temporary
conductivity caused by condensation must be expected.”
Encircled Flux (IEC 61280-4-1) Compliance
The MBR5 meter meets the Encircled Flux requirements defined in
IEC 61280-4-1 – Installed cable plant – Multimode attenuation measurement
Standard from 2009.
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Compliance
Electronic test equipment is subject to the EMC Directive in the European
Union. The EN61326 standard prescribes both emission and immunity
requirements for laboratory, measurement, and control equipment. This unit
has undergone extensive testing according to the European Union Directive and
Standards.
FCC Certification
15.19(a)(3) All devices
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference,
and (2) this device must accept any interference received, including interference
that may cause undesired operation.
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2
GENERAL INFORMATION
MBR5 Backreflection Meter Overview
The MBR5 Backreflection Meter is a portable, direct-display instrument that
measures backreflection, insertion loss, and power of single-mode or
multimode fiberoptic devices (i.e. connectors, components, and systems).
The MBR5 meter may be ordered as a single-mode or multimode model and
with up to four internal laser sources for operation at 850 and 1310 nm (for
multimode meters), and 1310, 1490, 1550, 1625 and/or 1650 nm (for singlemode meters). A variety of detector adapters are available to enable the
measurement of power (i.e. IL) from different connector types.
Figure 1: MBR5 Backreflection Meter
An important feature of the MBR5 meter is the FC/APC ultra-low backreflection
connector at its output port. To test different connector types, the user needs
only to change the hybrid launch jumpers, of which one side has a FC/APC
connector, and the other connector type to be tested. The connector’s end face
condition is very important as it directly affects the performance of the meter.
The MBR5 meter is supplied with two hybrid jumpers. The first one, called
measurement jumper, is to be used for every measurement and the second one,
called calibrated jumper, is to be used for calibration verification only.
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To ensure measurement quality, only calibration jumpers provided by JGR
Optics should be used. However, additional measurement jumpers may be
supplied by the customer, third parties or JGR Optics.
In addition to manual front panel operation, the MBR5 meter may be operated
over the RS-232 serial interface and IEEE 488 GPIB parallel interface. Please
refer to the “REMOTE CONTROL COMMANDS” section on page 44 for more
information.
Measurements
Backreflection Measurement
The MBR5 is an easy to use instrument that can measure both insertion loss and
backreflection parameters. In Backreflection mode, the MBR5 measures the
difference between the output power (Pout) and the reflected power (Prefl) and
automatically calculates and displays the backreflection.
The internal switch and coupler of the MBR5 meter enable it to automatically
reference out the variations of the internal light source, the signal offset with no
light (dark current), and the total signal level from internal and external
backreflection (BRtot).
The backreflection in dB from a device under test (BRDUT) is calculated using
the following equation, where BR0 is the stored value of the total backreflection
(in dB) of the device under test (DUT):
BR0

 BRtot
BRDUT = 10 • log10 10 − 10 10 


The BR5 meter displays the value of BRDUT.
During power up, the meter will measure the dark current and the reference
power. Approximately every 90 seconds, the meter will automatically update
the reference power measurement, a process that only takes a fraction of a
second and does not cause any significant delays. In normal operation, the
MBR5 meter can take approximately 3 backreflection measurements per second.
Loss and Power Measurement
The MBR5 meter is equipped with a front-panel InGaAs or Ge detector for
relative power (loss) and absolute power measurements. The meter is capable
of storing the dark signal from the detector so that high accuracy measurements
(as low as -80dBm for an InGaAs detector and -60 dBm for Ge detector) are
possible.
When making power measurements, the MBR5 meter will automatically correct
for dark current if the value has been stored. The power displayed (P) in dBm is
calculated from the total current measured when the light source to be
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measured is illuminating the detector (Itot) and the value of the leakage or dark
current (Id) measured, using the following equation:
P = 10 • log(I tot − I d ) + CAL
Where “CAL” is the factory calibration value and is dependent on the
wavelength.
Output Port
The output ports of the MBR5 meter are equipped with an ultra-low
backreflection APC connector. To prevent damage to the output port
connectors, a measurement jumper (also called “launch cable”) must be used
for all measurements, even for measuring a component with an APC connector.
Extreme care must be taken to avoid damaging the connector when
plugging and unplugging the launch cable. Connection must be kept
clean and should be inspected before every mating (this means both
connectors, the FC/APC on the launch cable and the FC/APC
connector on the MBR5 meter). Please refer to the Cleaning
Connectors section on page 36 for more information.
Hybrid Jumpers
The MBR5 meter is supplied with a hybrid measurement jumper and a hybrid
calibrated jumper. The measurement jumper has an APC connector at the input
end. The other end on the standard measurement jumper is UPC but, by
changing measurement jumpers, this end is user-selected to be compatible with
the input connector of the DUT; for example SC/UPC or APC or LC/APC or UPC.
The calibrated jumper has an APC connector at the input end and a UPC
connector at the output end.
Remember to use the measurement jumper for measurement purposes only
and to use the calibrated jumper for calibration verification purposes only. The
calibrated jumper has a label attached to it identifying it as such.
Coherence Length
Reflected light from multiple reflections can change the backreflection
measured by the MBR5 meter. This variation typically shows up as noise or drift
in the signal. The internal light source is designed to have low coherence length
(typically less than 10 cm). Thus, interference effects are typically seen only
between very closely spaced components such as non-contacting connectors.
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Key Features
•
•
•
•
•
•
•
Backreflection measurements to -80 dB for single-mode model (-60 dB for
multimode model)
Power measurements to -80 dBm with 2mm InGaAs Detector, -60 dBm with
5mm Ge Detector.
Uo tp 4 built-in light sources at 850, 1310, 1490, 1550, 1625 and/or 1650nm
Compensation for extraneous backreflection for accurate backreflection
measurements
RS-232 serial and IEEE 488 GPIB parallel interfaces
Direct display of measured backreflection, power, or insertion loss
Dual display mode for simultaneous BR and IL display
Applications
•
•
•
•
Connector backreflection and loss testing
Component testing
Installation verification
Quality assurance (QA) acceptance testing
Accessories
•
•
•
•
•
•
•
AC power cord
FC/APC-FC/UPC hybrid measurement jumper
FC/APC-FC/UPC hybrid calibrated jumper
FC-type detector adapter
Detector cap
User Manual
NIST traceable Calibation Certificate
Optional Accessories
•
•
•
Variety of detector adapters
Remote head
Measurement jumpers with various user-selected connectors
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3
SAFETY INFORMATION
To avoid situations that could result in serious injuries or death, always observe
the following precautions.
The safety instructions must be observed whenever the unit is operated,
serviced, or repaired. Failure to comply with any of these instructions or with
any precaution or warning contained in the User Manual is in direct violation of
the standards of design, manufacturing, and intended use of the unit. JGR
Optics assumes no liability for the customer’s failure to comply with any of
these safety requirements.
Safety Markings on the Unit
The following symbols and messages can be marked on the unit (see Table 1
below). Observe all safety instructions that are associated with a symbol.
Table 1: Safety Symbols
Laser radiation may be present. Refer to the User Manual for
instructions on handling and operating the unit safely. Avoid
looking into any ports near which this symbol appears.
Frame or chassis terminal for electrical grounding within the
unit.
Protective conductor terminal for electrical grounding to the
earth.
WARNING
CAUTION
Procedure can result in serious injury or loss of life if not
carried out in proper compliance with all safety instructions.
Ensure that all conditions necessary for safe handling and
operation are met before proceeding.
Procedure can result in serious damage to or destruction of the
unit if not carried out in compliance with all instructions for
proper use. Ensure that all conditions necessary for safe
handling and operation are met before proceeding.
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Classification
The MBR5 Series Backreflection Meter consists of an exposed metal chassis that
is connected directly to earth via a power cord and, therefore, is classified as a
Class 1 instrument.
Laser Specifications
The laser (or lasers) contained in the MBR5 meter is (are) Class 1 laser(s) as
specified under the laser classification of the US Food and Drug Administration
(FDA) Center for Devices and Radiological Health (CDRH). Laser specifications
are provided in Table 2 below.
CLASS 1
LASER PRODUCT
Table 2: Specifications
Parameter
Wavelength
Single-mode (SM)
Multimode (MM)
1310, 1490, 1550,
1625, or 1650 ± 10 nm
850, or 1310 ± 20 nm
1
1
Class
Fiber Type
9/125 µm SM
50/125 µm
MM
62.5/125 µm
MM
Maximum Accessible
Emission Level
-15 dBm
-23 dBm
-25 dBm
Maximum Output
Power
-1 dBm
-1 dBm
-1 dBm
Numerical Aperture
0.13
0.20
0.28
Effective Numerical
Aperture
0.20
0.27
0.34
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Safety Instructions
Laser Hazards
Warning
Never look into the end of an optical cable connected to an
optical output device that is operating. Laser radiation is
invisible, and direct exposure can severely injure the human
eye.
Electrical Shock Hazards
Warning
• Some of the circuits are powered whenever the unit is
connected to the AC power source (line power). To ensure
that all circuits are powered off, disconnect the power cord
from either the power inlet on the unit’s rear panel or from
the AC line-power source (receptacle). The power cord
must always be accessible from one of these points. If the
unit is installed in a cabinet, the operator must be able to
disconnect the unit from the line power by the system’s
line-power switch.
• Use only the type of power cord supplied with the unit. If
you need to replace a lost or damaged cord, make sure to
replace with a power cord of the same type.
• Connect the power cord only to a power outlet equipped
with a protective earth contact. Never connect to an
extension cord or any receptacle that is not equipped with
this feature.
• If using a voltage-reducing autotransformer to power the
unit, ensure that the common terminal connects to the
earthed pole of the power source.
• Do not interrupt the protective earth grounding. Such
action can lead to a potential shock hazard that can result in
serious personal injury. Do not operate the unit if an
interruption to the protective grounding is suspected.
• Do not operate the unit when its cover or panels have been
removed.
• To prevent potential fire or shock hazard, do not expose the
unit to any source of excessive moisture.
• Do not use the unit outdoor.
• Operating the unit in the presence of flammable gases or
fumes is extremely hazardous.
• If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment
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•
•
may be impaired. Only technicians authorized by JGR
Optics should carry out the repairs. In addition to voiding
the warranty, opening the unit (even when unplugged) can
expose you to potential shock hazards.
Some of the unit’s capacitors can be charged even when the
unit is not connected to the power source.
Do not perform any operating or maintenance procedure
that is not described in the User Manual.
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GETTING STARTED
Caution
To avoid injury or death, always observe the precautions listed
in “SAFETY INFORMATION” section on page 7.
This manual contains complete operating instructions for safe and effective
operation of the MBR5 Multi-Output Backreflection Meter. It is recommended
that users of the MBR5 familiarize themselves with contents of this manual
before using the instrument.
The inspection report and a description of any customer-requested information
may be found in the calibration document envelope included with the
instrument.
Initial Inspection
Warning
To avoid electrical shock, do not initialize or operate the unit if it
bears any sign of damage. Ensure that the unit and any devices
or cords connected to it are properly grounded.
 Inspect the package and contents for signs of damage.
 Ensure all contents are included:
•
•
•
•
•
•
•
•
MBR5 Series Backreflection Meter
1 AC power cord
1 FC/APC-FC/UPC hybrid measurement jumper
1 FC/APC-FC/UPC hybrid calibrated jumper
1 FC-type detector adapter
1 Detector cap
User Manual
NIST traceable Calibration Certificate
 Read the User Manual thoroughly, and become familiar with all safety
symbols and instructions to ensure that the unit is operated and maintained
safely.
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 Ensure the unit is operational:
•
•
•
Connect the unit to a power source using the provided power cord
Set the power switch to ON to initialize the MBR5 meter, and observe
the power-up sequence:
• Model number and firmware version of the meter are displayed
• Internal measurements of Pin and Pdark are made
• The message “Initializing” is displayed as the light source stabilizes
• The backreflection value (BR) of the front panel connector is
measured and displayed
Set the power switch to OFF and disconnect the meter.
 Keep the packaging.
 Immediately notify JGR Optics and, if necessary, the carrier if the content of
the shipment is incomplete, if the unit or any of its components are
damaged or defective, or if the unit does not pass the initial inspection.
Operational Requirements
In order for the unit to meet the warranted specifications, the operating
environment must meet the following conditions for altitude, temperature,
humidity, and voltage.
Table 3: Environmental Requirements
Parameter
Specification
Altitude
Up to 2000 m
Temperature
Range of 0 to 40 °C
Humidity
Up to 95% humidity (0 to 40 °C)
Voltage
Main supply voltage fluctuations must not
exceed ±10% of the nominal voltage
NOTE: The MBR5 meter may be equipped with up to four internal laser sources.
These are thermoelectrically cooled for added stability and are modulated at
10 KHz. Sudden changes in ambient temperature can cause one or several of
the sources to become unstable. If this occurs, the meter automatically
switches to a measuring mode in which Pin and Pdark are measured more
frequently than every minute and the message “Source Unstable” is displayed.
The light sources power is monitored, and the meter returns to the standard
measurement mode when the sources have stabilized.
Product Overview
Front Panel and Key Description
A front view of the MBR5 meter is shown on Figure 2 and a detailed description
of keys and LEDs is provided in Table 5 on next page.
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Note that the meter front panel will vary with model ordered (4-laser and
24-output single-mode model is shown).
FC/APC
MBR5 Backreflection Meter
CHANNEL
-65.37
1310
23
1
5
9
13
17
21
2
6
10
14
18
22
3
7
11
15
19
23
4
8
12
16
20
24
23
BACKREFLECTION
1310
1490
MENU
BR
1550
POWER
1625
DETECTOR
I
LOCAL
BR O
REF
DARK
O
Figure 2: Front of the Meter
Rear Panel
The back of the meter is shown in Figure 3 and the rear-panel features are
described in Table 4.
Figure 3: Back of the Meter
Table 4: Rear Panel Components
Component
Function
RS-232C
RS-232C serial interface port
IEEE 488 (GPIB)
GPIB (IEEE 488.1) interface port
~LINE
Power Input (also contains the user-replaceable fuse)
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Table 5: Operating Keys and Status LEDs
Key/LED
Description
I/O
ON / OFF Power switch.
MENU
Used to turn the Menu mode on and off. When deeper
menu levels are selected, press the MENU key to step back
one level at a time.
λ
Selects one of the two to four laser sources (depending on
model ordered).
Hold the λ key until “LD modulation OFF for scope”
message is displayed to put MBR5 lasers in CW mode.

Selects the output channel and adjusts the LCD Display
values.
BR
Press once to set the meter to backreflection measurement
mode; hold for 2 seconds to set the meter to dual display
mode (displaying BR and IL simultaneously).
BR0
Used to measure and store the backreflection value as BR0.
The key LED will light up to indicate that the function is on.
To restore the factory-set BR0 value, press the BR0 key
again. The key LED will turn off.
POWER
Used to switch to Optical Power Measurement mode and
toggle between absolute power and relative power display
when pressed again.
REF
Sets the reference power for relative power measurements
and adjusts the BR offset simultaneously. If held for 2
seconds, the REF button sets reference power for relative
power measurements and BR offset for all available
wavelengths.
DARK
Used to measure and store the user ID value used in dark
measurements. Key LED will light up when selected.
LOCAL
Brings the meter back to local mode when operating
remotely (with GPIB or RS-232/USB).
Soft Keys

Used to toggle the MENU items displayed or special
functions that are activated.
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OPERATION
Before the MBR5 meter can be used to make a measurement, the user must
setup the meter and connect and reference a “measurement jumper” to the
front panel connector.
Powering Up the Meter
To power up the meter:
1. Connect the meter to an AC power source using the power cord
provided. If the meter has been running, ensure that the meter is
powered off and restarted.
2. Set the power switch to I (ON), and wait for the “Initialization”
process to finish.
3. Allow a 30 minute warm-up time in order to obtain an accurate
reading.
Backreflection Measurements
Backreflection (BR) measurements with the MBR5 require terminating the fiber
at two different points. The difference in the backreflection between the two
termination points is then calculated and displayed. By choosing the
termination points before and after a DUT, the backreflection of the DUT can be
measured.
To perform BR measurements, two terminations must be made:
•
•
Before the DUT, for example, on the BR5 meter side (for measuring BR0)
After the DUT (for measuring BRtot)
If measuring very low backreflection in single-mode fiber, both termination
points need to be made as close as possible to the DUT to minimize the errors
associated with Rayleigh backscattering in the fiber. The backreflection of all
components and connections between these two points is included in the
equation for calculating the backreflection value (BR) of the DUTs.
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Set-up for BR Measurements
To prepare the meter for backreflection measurements:
1. Follow the “POWERING UP THE METER” sequence on page 15.
2. Clean the output port on the front of the meter and the FC/APC
connector of the measurement jumper (see the “CLEANING THE
CONNECTOR ENDS” section on page 34).
3. Connect the FC/APC end of the measurement jumper to the output
port on the meter. Make sure to properly align the connector key
and screw it firmly but do not over screw. The output connector of
the measurement jumper is user-selected and must be compatible
with the input connector of the DUT.
4. Attach the appropriate adapter to the detector on the front of the
meter.
5. Press the BR key to set the meter to Backreflection mode. BR mode
is indicated on the display.
6. Press the  or  key to select the required output port.
7. Press the λ key to select the required wavelength.
8. Clean and connect the output connector of the measurement
jumper to the detector adapter on the front of the meter.
9. Press the REF key; the offset value (equal to twice the measured
loss) is briefly displayed. A small dot on the bottom right of the LCD
display is displayed to indicate that the meter is using the measured
offset value to calculate the backreflection.
10. To have the meter perform the setup for all wavelengths, press and
hold the REF key for two seconds.
11. Repeat steps 1 to 10 for the next required output port.
12. Disconnect the output connector from the detector adapter.
Measuring BR0
1. Press the λ key to select the required wavelength.
2. Terminate the measurement jumper just before the output
connector, and hold the termination point steady. Refer to the
“TERMINATION TECHNIQUES” section for more information on how
to properly perform a termination on page 25.
3. Press the BR0 key to store the new BR0 value. The key LED will light
up to indicate that the BR0 value has been stored. If a previous BR0
measurement has already been stored (i.e. the BR0 LED is already
ON), the old value must be deleted first by pressing the BR0 key to
turn the BR0 LED OFF. Pressing the BR0 button again will store the
new value.
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Repeat the preceeding steps for all other wavelengths at which the
measurements are to be made.
MBR5 Backreflection Meter
CHANNEL
-65.0dB
1310
1
BACKREFLECTION
MENU BR POWER
1
850
1310
1550
FC/APC
DETECTOR
LOCAL BRO
REF DARK
Measurement
Jumper
Mandrel Wrap
Figure 4: Measuring BR0 (Mandrel Technique)
Measuring BR (Including Connector)
Once a BR0 measurement is performed and the value stored, the second
termination is made after the DUT in order to obtain BRtot . To measure the
backreflection from a DUT, such as a connector, follow the instructions below.
NOTE: Only Single-Mode fiber termination is shown. Please refer to the
“TERMINATION TECHNIQUES” section for multimode fiber termination.
1. Clean the output connector of the measurement jumper and the
input connector of the DUT, and mate the two. Refer to the
“CLEANING CONNECTORS” section for more information on page 36.
2. Press the λ key to select the wavelength at which the measurement
is to be made.
3. Terminate the measurement jumper immediately after the DUT
(see Figure 5 and Figure 6) and hold the termination point steady.
4. The meter displays the backreflection that is caused by the fiber, all
connections, and the DUT that lies between the two termination
points (that is the termination point for BR0 and the current
termination point. This area is shown within the dashed line in
Figure 7.
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MBR5 User Manual
MBR5 Backreflection Meter
CHANNEL
-61.0dB
1310
1
BACKREFLECTION
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
Mandrel Wrap
Figure 5: Measuring backreflection of a connector
MBR5 Backreflection Meter
CHANNEL
-58.0dB
1310
1
BACKREFLECTION
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
DUT
Mandrel
Wrap
Figure 6: Measuring backreflection of a connectorized DUT
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MBR5 User Manual
MBR5 Backreflection Meter
CHANNEL
-58.0dB
1310
1
BACKREFLECTION
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
DUT
Termination
Point
for BRTOTAL
Termination
Point
for BR0
Figure 7: Backreflection measurement area
Measuring BR (Excluding the Connector)
The method described in the “MEASURING BR (Including Connector)” section is
used to measure the backreflection if the DUT is a connector, or if the DUT is a
connectorized component and the total backreflection from the connector and
the DUT is desired.
It is sometimes desirable to know the backreflection of a connectorized DUT,
but excluding the connector. If the fiber type is single-mode, this is possible, but
a few extra steps must be taken for every measurement to reference out the
connector (i.e., the user must do a BR0 for every DUT).
Refer to the “MEASURING BR (Including Connector)” section and redo the BR0
measurements for each wavelength, but this time, when terminating between
the DUT’s connector and the DUT. Note that if a BR0 value has already been
stored, it is required to press the BR0 button first, to erase it and then press it
again to store the new value.
Create a termination point on the pigtail after the DUT. The meter now displays
the backreflection of the DUT only.
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MBR5 User Manual
FC/APC
BR = -58.0dB
BR
POWER
I
(LOCAL)
BR0
DARK
O
1310
1490
1550
1625
Measurement
Jumper
DUT
Termination
Point
for BRTOTAL
Termination
Point
for BR0
Figure 8: Measuring BR – Excluding Connector
Backreflection Accuracy and Range
The absolute accuracy of backreflection measurements made with the meter is
dependent on the level of backreflection to be measured.
The backreflection measurement range is restricted by the BR0 level. The meter
can measure backreflection levels 15 dB below BR0 to a maximum of -80 dB (-60
dB for multimode). For example, if BR0 is -40 dB, the minimum backreflection
of the DUT that can be measured is -55 dB.
An asterisk (*) is displayed near the range limit (last 5 dB of range if using BR0,
below -60 dB otherwise) to indicate that the setup and measurement
procedures described in the previous two sections must be followed carefully to
ensure accurate results.
The small amount of reflections that BR0 represent can be polarization sensitive,
and multiple reflections can cause interference effects that can make the
reflections very sensitive to temperature.
NOTE: To ensure accurate backreflection measurements below -65 dB (-25 dB
for multimode), perform the BR0 measurement at least once per shift.
The measured backreflection is also affected by losses that can occur between
the meter and the DUT. To compensate for these losses, measure the total
amount of loss between the output of the measurement hybrid jumper and the
input of the DUT (see “LOSS AND POWER MEASUREMENT” section on page 21),
double this value and add it to the backreflection value displayed on the meter.
In the following example, the total loss between the meter and the DUT is 2.0
dB, and the displayed backreflection is -29 dB:
BR = -29 dB + (2 x 2.0 dB) = -25 dB
Absolute accuracy specifications are dependent upon the accuracy of the MBR5
meter calibration, so a calibration verification needs to be performed
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MBR5 User Manual
periodically.
information.
Refer to the “CALIBRATION” section on page 31 for more
Loss and Power Measurements
Set-Up for Loss and Power Measurements
To prepare the meter for loss and power measurements:
1. Follow the “POWERING UP THE METER” sequence on page 15.
2. Press the  or  key to select the required output port.
3. Clean the output port on the front of the meter and the FC/APC
connector of the measurement jumper (see the “CLEANING THE
CONNECTOR ENDS” section on page 34).
4. Connect the FC/APC end of the jumper to the output port on the
meter.
NOTE: Ensure that you are using the measurement jumper and not the
calibration jumper, which is labeled as such.
5. Attach the appropriate detector adapter to the detector on the
front of the meter.
6. Connect the output connector of the measurement jumper to the
detector adapter. This end of the measurement jumper is userselected and must be compatible with the input connector of the
DUT.
7. Press the λ key to select the desired wavelength.
8. Press the POWER key to set the meter to Power mode. When in
Power mode, the meter displays “Absolute Power” at the bottom of
the screen, in contrast, “Relative Power” is displayed during relative
power mode.
9. Press REF key to take a reference. The display reads 0.00 dB. The
loss of the measurement jumper is subtracted from the DUT loss or
power measurement to be made (see Figure 9).
10. Pressing and holding the REF key will take a reference at each
wavelength.
11. Repeat steps 1-10 for the next required output port.
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MBR5 User Manual
MBR5 Backreflection Meter
CHANNEL
-0.00dB
1310
1
Absolute Power
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
Figure 9: Loss and Power Measurements
Dark Current Measurement
For loss and power measurements below -50 dBm, it is necessary to perform a
dark current measurement (measurement of power with no light).
1. Ensure that the detector is covered, for example, that the detector
cap is on or the output connector is connected to the detector. This
dark current value will be subtracted from future loss and power
measurements.
2. Press the DARK key. The key LED lights up to indicate that the userstored value of ID (the dark signal from extraneous sources) is used
to calculate the DUT loss or power.
If the detector is not properly covered, the message “Too Much Light!” is
displayed. If the ID value is not stored prior to a measurement, the last value
stored is used.
Measuring Power
In Power mode, absolute power measurements are displayed in dBm.
To perform power measurement of a DUT, make sure to perform the set-up
steps in the “SET-UP FOR LOSS AND POWER MEASUREMENTS” section on page
21 and then, follow these steps:
1. Press the Power key to set the meter to Power mode.
2. Press the  or  key to select the required output port.
3. Press the λ key to select the wavelength at which the measurement
is to be performed.
4. Clean the output connector of the measurement jumper and the
input connector of the DUT, and connect the two connectors.
5. Connect the output connector of the DUT to the detector on the
front of the meter. The detector must be equipped with the
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MBR5 User Manual
appropriate detector adapter. The BR5 meter displays the DUT
absolute power output (see Figure 10).
6. For measurements at additional wavelengths, repeat the steps 2 to
5 for each wavelength.
MBR5 Backreflection Meter
CHANNEL
-9.0dBm
1310
1
Absolute Power
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
DUT
Figure 10: Measuring Absolute Power
Measuring Relative Power (Insertion Loss)
The relative power value displayed by the BR5 meter is the negative value of the
insertion loss, for example -31 dB instead of 31 dB. Relative power is displayed
by the meter in dB.
To perform relative power measurement of a DUT (insertion loss), make sure to
perform the “SET-UP FOR LOSS AND POWER MEASUREMENTS” section on page
21 and then, follow these steps:
1. Press the Power key to set the meter to Relative Power mode. In
Relative Power mode, the meter displays “RELATIVE POWER” on
the lower part of the LCD and the reading (i.e. -0.15 dB) is displayed
on the top of the display.
2. Press the  or  key to select the required output port.
3. Press the λ key to select the wavelength at which the measurement
is to be made.
4. Clean the output connector of the measurement jumper and the
input connector of the DUT, and connect the two together.
Connect the output connector of the DUT to the detector on the
front of the meter. The meter displays the loss due to the DUT (see
Figure 11).
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MBR5 User Manual
5. For measurements at additional wavelengths, repeat steps 3 to 5
for each desired wavelength.
MBR5 Backreflection Meter
CHANNEL
-0.15dB
1310
1
Relative Power
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
DUT
Figure 11: Measuring Relative Power
Power Accuracy
The absolute accuracy of power measurements made with the MBR5 meter is
dependent on the power level to be measured. The MBR5 meter does not
measure power levels below -50 dBm unless internal electronic noise is
measured and its value, described by the dark current ID, is stored.
To ensure accurate power measurements below -60 dBm for 5mm Ge detectors
and -80 dBm for 2mm InGaAs detectors, perform a Dark Current Measurement
frequently. Refer to the “DARK CURRENT MEASUREMENT” section on page 22
for the procedure.
NOTE: The value of ID can change with temperature variations.
Dual Display Mode
The MBR5 Meter is capable of displaying both the backreflection and the power
measurement (insertion loss) simultaneously.
To enable Dual Display Mode, press the BR a first time to go to Backrefelction
mode and then press the BR button again for 2 seconds. The meter will display
the backreflection value on the left and the Power value on the right, as shown
in Figure 12.
In Dual Display Mode, it is possible to view absolute or relative power
measurement values by pressing the Power key.
To exit this mode, press the BR button again.
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MBR5 User Manual
BR = -XX.XdB
IL = -X.XdB
1310
1
DUAL DISPLAY
Figure 12: Dual Display Mode
Termination Techniques
Termination is a term to describe the action of blocking all backreflection
beyond a point in a network of components. The termination technique varies
depending on the fiber type. There are two main termination techniques:
•
•
Mandrel wrap consists of wrapping the fiber around a relatively small
mandrel, causing attenuation in the fiber which prevents any reflected light
after the mandrel from returning back to the meter. Mandrel wrapping is
used exclusively on single-mode fiber since mandrel wrapping does not
attenuate the lower order modes in multimode fiber (i.e. impossible to
attenuate all the light in a multimode fiber using a mandrel wrap).
Index-Matching Medium allows the light to escape the fiber through the
end of the fiber (either bare fiber, or through a connector) with minimal
reflections back to the meter. Index Matching Medium can be used on
single-mode fiber if expected BR is not lower than -65dB (UPC connectors)
and multimode fiber, but since it is less effective than mandrel wrapping, it
is usually used on multimode fiber only. Remember that index matching
medium cannot be used on single-mode fiber with APC connectors since
expected BR of such connectors is below -65dB.
Termination of the fiber is critical. Stable and repeatable backreflection
measurements will only be achieved with stable and repeatable termination of
the fiber.
Mandrel Wrap Technique (for Single-mode Fiber)
As mentioned above, termination of single-mode fiber is most of the time
performed by mandrel wrapping. Remember however that the index-matching
technique described below could also be used for single-mode fiber with UPC
connectors.
High-attenuation bends in the fiber (bends with a relatively small radius)
remove all backreflection and can be made anywhere along the length of the
cable. Typical mandrel diameters will be as follow:
•
13 mm for 1490, 1550, 1625 and 1650 nm
•
9 mm for 1310 nm with SMF-28 fiber
•
7 mm for 1310 nm with low bend sensitive SMF.
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MBR5 User Manual
When measuring backreflection levels below -60 dB, low-attenuation bends
(bends with a relatively large radius) need to be made just before the highattenuation bends in order to offset the small amount of reflection caused by
the high-attenuation bends.
1. Use the supplied rod and use the appropriate section depending on
the fiber type as described above. The required number of turns
will vary with BR0 value of the MBR5 meter. Wind the
Measurement jumper around the rod until Br0 is at MAX and no
longer decreases. For example, wind until BR0 remains at -68dB
MAX regardless of number of turns. Unwind until BR0 goes below 68dB again and then add 1 turn. Count number of turns and use the
same numbr of turn after your DUT for best BR accuracy.
2. To minimize any memory of the bends in the jumper jacket, do not
pull on the jumper while winding, and occasionally wind it in the
opposite direction.
MBR5 Backreflection Meter
CHANNEL
-65.0dB
1310
1
BACKREFLECTION
MENU BR POWER
1
850
1310
1550
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
Mandrel Wrap
Figure 13: Mandrel Wrap Termination Technique (Single-Mode)
Remember also that index-matching technique described below can also be use
on single-mode fiber with UPC connectors when expected BR is greater
than -65dB.
Index-Matching Technique (for Multimode Fiber)
Termination for multimode fiber is performed by using index-matching
gel/block.
1. Apply index-matching gel directly to the end of the fiber or press
the ferrule into an index-matching block. See Figure 14.
2. After measuring the BR0, clean the connector end as per the
“CLEANING CONNECTORS” section on page 36.
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MBR5 User Manual
MBR5 Backreflection Meter
CHANNEL
-65.0dB
1310
1
BACKREFLECTION
1
850
1310
1550
MENU BR POWER
FC/APC
DETECTOR
I
LOCAL BRO
REF DARK
Measurement
Jumper
O
Index Matching
Gel/Block
Figure 14: Index-Matching Termination Technique (Multimode)
User Menu Operation
Accessing the User Menu
To access the User Menu, simply press the “MENU” button. LED indicator will
light.
User Menu options are detailed in Table 6.
Navigating the User Menu
•
•
•
•
Access each option by pressing the corresponding softkey to the right of the
display.
Return to the main user menu at any time by pressing the MENU button.
For the Transmission RATE and GPIB ADDR options, begin by selecting the
option with the softkey, and use the up/down arrows to scroll through the
numbers. Press the softkey again to exit from this mode.
To exit and save changes, press the menu button until prompted to “Quit?”
or “Save?” Quitting exits the Menu Mode without saving changes. Selecting
save will store the changes until they are overwritten by a new set of saved
changes.
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MBR5 User Manual
Table 6: User Menu Options
Options
Note
REMOTE MENU
JGR COMMAND SETs/
EMULATE JDSU RX3
Default: JGR COMMAND SETs
In remote control, the MBR5 Meter may be
operated using the JGR command set, or
emulate a JDSU RX3 meter and accept the
RX3 commands.
INTERFACE: RS-232 / GPIB
Default: RS-232
The RS-232 selection prompts the Baud Rate
option.
The GPIB selection prompts the GPIB
address option
BAUD RATE: ____
Default: 9600
Choose a rate between 300 and 38400 kbit/s
GPIB ADDR: __
Default: 21
Select a GPIB address between 01 and 30
OPTION MENU
AVERAGE: ON/OFF
Default: OFF
Averages 10 measurement samples to
provide an averaged value
Compensate IL: ON/OFF
Default: ON
Monitors and compensates for internal
source drift
SETUPviaLOSS: ON/OFF
Default: ON
Adjusts the BR measurement by
compensating for loss at the connector.
The measurement is taken during IL
reference and offsets BR by twice this value.
MULTIDISPLAY: ON/OFF
Default: OFF
Multidisplay mode
Save?
Quit?
Once changes are made the meter returns to
the measurement mode.
Compatibility with JDSU RM3 or RX3 Meters
The MBR5 can be set to emulate a JDSU RX3 backreflection meter via the
RS-232 or GPIB interface. The MBR5 will respond to RX3 commands if the user
sets the MBR5 into JDS Compatible Mode as follows:
1. Access the User Menu as described in the User Menu Operation section.
2. Select the “REMOTE MENU” option and use the softkey to change
“MBR5 Command Set” to “Emulate JDSU RX3”. Save this selection.
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MBR5 User Manual
3. The user must also select 1200bps transmission rate to enable
communication between existing RX3 software and the MBR5 over
RS-232 interface.
4. Ensure the correct GPIB address is selected when using the GPIB
interface.
5.
Refer to the JDSU RX3 user’s manual for command details.
MBR5-UM-00001 Rev 003
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MBR5 User Manual
Messages and Symbols
The messages/symbols displayed by the MBR5 meter are shown in Table 7.
Table 7: MBR5 Meter Display Messages and Symbols
Display
Description
MBR5 VER X.XX
Displayed momentarily during the power-up
sequence and indicates the firmware version.
INITIALIZING
Displayed momentarily during the power-up
sequence as the initial internal reference
measurements are made
-XX.X dB
Backreflection measurement mode
-XX.X * dB
???
-XX.XX dBm
Absolute Power measurement mode
-XX.X X dB
Relative Power measurement mode
<
P or BR is lower than the minimum measurable value
>
P is greater than the maximum measurable value
BR0 STORED=-XX.X
Displayed momentarily when the BR value (-XX.XdB)
is being stored as BR0.
Warning! BR0 higher
than normal!
Once changes are made the meter returns to the
measurement mode.
All SetupViaLoss
Displayed momentarily after a reference has been
taken for all wavelengths (by holding the reference
button down for 2 seconds in BR mode)
X.XX dB Offset
Displayed momentarily when the SetupViaLoss
function BR offset is taken.
Ref ALL WL
Displayed momentarily after a reference has been
taken for all wavelengths (by holding the reference
button down for 2 seconds in Absolute Power mode)
I-DARK MEASURING
I-DARK STORED
Displayed momentarily when making a Dark
measurement and once value has been stored
BR -XX.X dB
IL - X.X dB
DUAL DISPLAY
Dual Display Mode shows backreflection (on the top)
and the power (below) simultaneously.
TOO MUCH LIGHT
Displayed momentarily if the dark current value (ID)
value is too high.
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MBR5 User Manual
Display
Description
LASER POWER LOW
Displayed momentarily when the laser power is too
low.
LASER POWER HIGH
Displayed momentarily when the laser power is too
high.
SOURCE UNSTABLE
Displayed momentarily when the laser power is
unstable.
Calibration
Caution
Devices with malfunctioning lasers must be returned to the
manufacturer for repair.
Calibration should be performed by a qualified Calibration Laboratory. Power
and Backreflection values of the MBR5 Meter are factory-set and must be
periodically adjusted to maintain performance.
Calibration Period
JGR Optics recommends a 1 year calibration period for the MBR5 Backreflection
Meter.
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MBR5 User Manual
6
PROGRAMMING GUIDE
Setting up for RS-232, USB or GPIB communication
The MBR5 Series backreflection meter may be remotely controlled via GPIB
(IEEE-488) and RS-232 interface. The GPIB interface of the meter conforms to
the ANSI/IEEE standards 488.1-1987 and 488.2-1987. The RS232C interface
conforms to ANSI/IEEE standard 488.2-1987 where applicable.
The common command set conforms to ANSI/IEEE 488.2 standard syntax. All
other commands conform to the Standard Commands for Programmable
Instruments (SCPI) command language, version 1999.0.
Accessing the “User Menu” mode
In order to establish communication between the computer and the meter, the
RS-232 bus or the GPIB bus must be configured properly. The different options
for the communication are contained in the User Menu. Refer to the “USER
MENU OPERATION” section on page 27 for further details.
JDSU Compatibility
Refer to JDSU user manual programming guide section of the backreflection
meter when a JDSU emulation mode is chosen.
Programming over GPIB
The MBR5 supports the IEEE-488.1(1987) interface standard. It also supports the
mandated common commands of IEEE-488.2(1987) standard. Before attempting
to communicate with the meter over the GPIB interface, the device address
must be set. The address is set by accessing the USER MENU function from the
front panel.
Programming Over RS-232
In order to establish a serial communication between a computer and the MBR5,
the computer’s COM port must be configured as described in Table 8.
To connect the MBR5 to the computer, a standard 9 pins straight RS-232 cable is
required. Only three pins, Txd, Rxd and GND are needed.
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MBR5 User Manual
Programming Over USB
It is also possible to remote control the MBR5 meter via USB by using a USB to
DB9 adapter cable.
The same RS-232 commands are used for USB
communication.
Table 8: Serial Communication Settings
Transmission Rate
Selectable in the “User Menu”. Available options are 300,
1200, 2400, 9600, 19200 and 38400 Baud
Data bit
8
Parity
N
Stop bits
1
Flow Control
None
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MBR5 User Manual
7
MAINTENANCE AND
TROUBLESHOOTING
Maintenance
Warning
Devices with malfunctioning lasers must be returned to the
manufacturer for repair.
Cleaning the Unit
1. Unplug the unit from the line power.
2. Clean the enclosure with a damp cloth.
3. Do not plug the unit back until it is completely dry.
Cleaning the Connector Ends
1. Clean all connector ends with a lint-free tissue and alcohol before
every mating. See the “CLEANING CONNECTORS” section on page
36.
2. Loosen the retaining screws of the connector panel, and remove the
panel carefully to access the internal connectors
(
3. Figure 15).
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MBR5 User Manual
4. Remove the connector from the mating sleeve in the panel.
5. Clean the connector end faces and mating sleeve in accordance with
the “CLEANING CONNECTORS” Section on page 36.
6. Reinstall the connector onto the panel.
7. Reinstall the connector panel. To avoid damaging the input and
output port fibers, make one or two large loops in the fibers when
reinstalling the panel.
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MBR5 User Manual
Figure 15: Removing Connector Panel
Cleaning Jumper Connectors
Warning
Connecting damaged or dirty fibers to the unit can damage the
front-panel connectors of the unit.
Never force an optical connector. Some connectors have a
ceramic ferrule that can easily be broken.
Optical cable ends need to be cleaned before using them with the unit. The
following items are required for cleaning the connector:
•
•
•
Filtered compressed air or dusting gas
Lint-free swab and lint-free towels
Optical grade isopropyl alcohol or optical grade 200° ethanol (do not use
rubbing alcohol, which contains 30% water)
To clean the connectors:
1. Blow the sleeve with filtered compressed air.
2. Apply optical grade isopropyl alcohol or optical grade ethanol to a
small area of a lint-free towel and rub the end of the ferrule over
the wet area.
3. Wipe the ferrule on a dry area of the lint-free towel.
4. Using the dusting gas or compressed air, blow the end of the ferrule.
5. Apply the alcohol or ethanol to a lint-free pipe cleaner or swab and
wipe off the remaining parts of the connector.
6. With the other end of the pipe cleaner or swab, dry the areas
cleaned.
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MBR5 User Manual
7. Using the dusting gas or compressed air, blow the areas cleaned.
Ferrule
Figure 16: Connector (Connector Type May Vary)
Troubleshooting
If any problem described in this section persists, contact JGR Optics or your local
representative.
Connector Issues
Front Panel Connectors
Follow the maintenance procedure described in the section: “CLEANING THE
CONNECTOR ENDS” section on page 34, to ensure that the internal pigtail
connectors are clean and properly connected to the front panel mating sleeve.
If cleaning is not sufficient, the FC/APC connector can be polished.
Connector Loss and Backreflection
Ensure that the insertion loss and backreflection of all the connectors are low
and stable, complying with the connector specifications.
MBR5 Calibration Issues
To verify MBR5 calibration, follow the procedure below. If results are different
than those indicated, please contact JGR Optics to have your unit calibrated.
1. Make sure to clean front panel connector. Refer to the “CLEANING
CONNECTOR ENDS” section on page 34.
2. Turn MBR5 meter to ON
3. Leave meter in BR measurement mode
4. Verify the calibrated jumper to make sure it is not damaged and
that all connectors are cleaned. Refer to the “CLEANING JUMPER
CONNECTORS” section on page 36 if necessary.
5. Connect the APC end of the calibrated jumper to the APC connector
of the source
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MBR5 User Manual
6.
7.
8.
9.
10.
11.
12.
13.
Connect the FC/UPC end to the detector adapter
Select Absolute mode
Make sure that output power is above -10 dBm for all laser sources
Take an IL reference for each wavelength. Select Relative mode by
pressing and holding the Power button until zero.
Select BR mode
Terminate the calibrated jumper by applying a mandrel wrap in the
middle
Verify BR readings to be below -65 dB for all wavelengths
Relase the mandrel wrap and verify that BR value is within the
following ranges: 14.7 dB ± 0.4 dB for 1310 nm and 14.8 dB ±0.4 dB
for 1490, 1550 and 1625 nm for single-mode fiber and 14.4dB +/0.4dB at 850nm 14.5dB +/- 0.4dB at 1310nm for multimode fiber.
Loss and Reflection issues
Backreflection measurement accuracy is greatly impacted by losses before the
DUT and by reflections before and after the DUT.
Losses before the DUT
When a DUT is connected to the MBR5 meter, insertion loss of the connectors
before the DUT affects the backreflection reading. As light travels from the
MBR5 meter and returns, it goes through the connectors twice, so the effect of
the losses is doubled. If the insertion loss is close to 0.15 dB, its effect is
compensated automatically by the meter. If the insertion loss differs
substantially from 0.15 dB, follow the measurement procedures described at
the end of the LOSS AND POWER MEASUREMENTS” section on page 21.
Reflections before the DUT
When a device is connected to the BR5 meter, the reflections from the
connectors affect the backreflection reading. The front panel FC/APC
connections must have backreflection levels below -65 dB for single-mode (-45
dB for multimode). To ensure that the MBR5 meter automatically compensates
for backreflections, follow the set-up procedure described in the
“BACKREFLECTION MEASUREMENTS” section on page 15, and ensure that the
backreflection does not change from the time of the setup.
Reflections after the DUT
When making a backreflection measurement, the fiber after the DUT must be
terminated to eliminate the reflections from the end of the fiber (see the
“TERMINATION TECHNIQUES” section on page 25). For the greatest accuracy
when making very low backreflection measurements, terminate the fiber near
the DUT to eliminate reflections from the fiber itself.
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Long Cables (for single-mode model only)
Terminate the cables near the devices or connectors being tested in order to
eliminate backreflection from the fiber.
Laser Stability
If the message “Source Unstable” or “LASER POWER LOW” is displayed, remove
the front connector panel, clean the front panel connectors, connect the
internal FC/APC connector to the detector adapter, and press the Power key to
set the meter to Power mode. The reading must be steady and higher than -10
dBm. If not, perform the procedure recommended in Table 9 when this
message is displayed.
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Table 9: Front Panel Display Function
Display
Problem
Solution
Meter does not turn on
Turn OFF the unit.
Connect the MBR5 meter to a
reliable power source, and wait a
few minutes.
Turn the unit ON.
INITIALIZING
Message is displayed for
a long time
Turn OFF the unit.
Connect the MBR5 meter to a
reliable power source, and wait a
few minutes.
Turn the unit ON.
*
Backreflection
measurement is getting
close to MBR5 meter
limit
Follow the setup and
measurement techniques
described in the “SETTING UP
THE METER FOR
BACKREFLECTION
MEASUREMENTS” section
<
BR range is very limited
Follow the setup and
measurement techniques
described in the “SETTING UP
THE METER FOR
BACKREFLECTION
MEASUREMENTS” section
TOO MUCH
LIGHT!
Dark current (ID) value
is too high
Attach the detector cap to the
detector, and press the ID key.
LASER POWER
LOW
Laser power is too low
Check the measurement setup
for possible source of light being
reflected back to the output port
of the source.
LASER POWER
HIGH
Laser power is too high
Check the measurement setup
for possible source of light being
reflected back to the output port
of the source.
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8
STORAGE AND SHIPPING
Damage can occur from improper handling during storage or shipping. Make
sure to maintain the unit within the specified temperature range during storage
or shipping. Please follow the recommendations below to minimize the
possibility of damage:
If possible, pack the unit in its original packing material when shipping;
Avoid high humidity or large temperature fluctuations that cold generate
condensation within the unit.
Avoid unnecessary shocks and vibrations.
Returning Instruments to JGR Optics
As indicated above, please ship the returned material in the original shipping
box and packing material. If these are not available, follow the guidelines below:
1. Contact JGR Optics to obtain a RMA number;
2. Cover the front panel with foam to prevent damage;
3. Wrap the unit in anti-static packaging. Use anti-static connector
covers;
4. Pack the unit in a strong enough shipping box considering the unit’s
weight;
5. Use enough shock-absorbing material (10 to 15 cm) to cushion the
unit and prevent it from moving inside the box. Pink poly anti-static
foam is recommended;
6. Seal the shipping box securely;
7. Clearly mark FRAGILE on at least 3 of the 4 sides of the box;
8. Always provide the model and serial number of the unit and, if
necessary, the RMA number on any accompanying documentation.
If possible, indicate the RMA number on the box itself to facilitate
identification.
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Contact Information
JGR Optics Inc.
160 Michael Cowpland Drive
Ottawa, Ontario, Canada
K2M 1P6
MBR5-UM-00001 Rev 003
Phone: 613-599-1000
Fax: 613-599-1099
sales@jgroptics.com
www.jgroptics.com
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A
SPECIFICATIONS
Specifications are provided here as a reference only and may be changed
without notice. Please refer to JGR Optics’s website for the most recent
specifications.
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B
REMOTE CONTROL
COMMANDS
Command Syntax and Style
Program Message Formats
A program message consists of a command header, followed by its required
parameters. The parameters must be separated from the command header by a
space, for example, *ESE 10. Multiple parameters must be separated by a
comma ( , ).
Each program message can contain one or more message units. The message
units in a program message must be separated by a semicolon ( ; ), for example,
*CLS;*ESE 10.
Terminating a Program Message
The command terminator should be a linefeed <LF> plus EOI for GPIB, and a
carriage return <CR> plus a linefeed <LF> for RS-232. No command processing
occurs until a command terminator is received.
Command Header Variations
Each command header in the command tree has a long form and a short form.
Both forms are acceptable and each form gives an identical response.
Examples:
:SOURCE:WAVELENGTH 1310
:SOUR:WAV 1310
:STATUS:OPERATION:ENABLE 255
:STAT:OPER:ENAB 255
The query form of a command must end with a question mark ( ? ). A command
can be entered in either uppercase characters or lowercase characters.
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Specifying the Command Path
In order to use a command in the command tree, the meter must know the full
path to the command. If the command is the first command in the program
message, the command header must contain the full path to the command.
Subsequent commands in the same program message are automatically
referenced in the same path as the previous command, unless a colon ( : )
precedes the command’s command header, in which case the full path to the
command must be included in the command header.
[:SOURce]
:WAVelength
<wavelength>
The following program messages are valid:
SOUR:WAV 1310;WAV?
SOUR:WAV 1310;:SOUR:WAV?
STAT:OPER:ENAB 5;ENAB?
The following program messages are NOT valid:
SOUR:WAV 1310;SOUR:WAV?
(no colon before second command)
CHAN:NEXT;CHAN?
(CHAN command at different level than NEXT)
Default Commands
Default commands are commands that do not need to be explicitly included in
the command path. If a default command for a path exists, it is enclosed by
square brackets ([ ]) in the command tree. If a default command is implied in
the first command of a program message, the command path for subsequent
commands is determined as if the default command had been explicitly
included in the first command header.
[:SOURce]
:WAVelength
<wavelength>
The following program messages are valid:
SOUR:WAV 1310
WAV 1310
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Implemented Status Structures
MBR5 meter has the following status data structures implemented:
•
IEEE 488.2 defined standard registers (standard status structure)
The 488.2 standard status structure consists of four registers:
•
•
•
•
status byte register
service request enable register
standard event status register
standard event status enable register
Note that the standard event status register and the event register are both
“sticky” (i.e. once their bits are set to 1 they remain set until they are cleared by
appropriate commands). The status byte register and the condition register are
both dynamic and get updated when the state of the instrument or the
underlying status structures change. Refer to IEEE488.2 and SCPI1999
documents for further details.
Status Byte Register
The status byte register contains the summary bits for each of the structures
implemented in the meter, the master summary bit (MSB) and the request for
service bit (RQS).
Status Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
request for
service
event message
(QSB)
summary available
or
not
master
(ESB)
(MAV)
used
summary
Read with
By serial polling
*STB?
Written to with
Cannot be written to
Cleared by
*CLS common command
(OSB)
not
used
Bit 2
Bit 1
Bit 0
not
used
not
used
not
used
•
Bit 0 to Bit 3 are not used.
•
Bit 4 (message available) is set to 1 when a response message is available in
the output queue.
•
Bit 5 (event summary bit) is the summary bit for the standard event status
structure. The ESB summary message bit is set if any bit in the standard
event status register is set while its corresponding value in the standard
event status enable register is set.
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•
Bit 6, as the service request bit, is set to 1 if a service request has been
generated.
Bit 6, as the master summary bit, is set when there is at least one reason for
the meter to request service from the controller. That is, the master
summary bit is set if any summary bit in the status byte register is set and if
the corresponding bit in the service request enable register is also set.
•
Bit 7 (operation summary bit) is not used.
Service Request Enable Register
The service request enable register determines which summary bits in the
status byte register can generate service requests. If a summary bit in the status
register is set to 1 and the corresponding bit in the service request enable
register is set to 1, a service request is generated by the meter. A new service
request is not generated for this condition unless the bit in the status register or
the bit in the service request enable register is cleared and the condition
reoccurs.
Service Request Enable Register
Read with
*SRE? common query (the value of bit 6 is always 0)
Written to with
*SRE common command (the value of bit 6 is always
zero, regardless of the value sent with the command)
Cleared by
*SRE common command with a parameter value of 0
Power-on
Standard Event Status Register
Bit 7
Bit 6
power on
(PON)
user
request
(URQ)
Read with
Written to with
Cleared by
Standard Event Status Register
Bit 5
Bit 4
Bit 3
Bit 2
device
command execution
dependent
error
error
error
(CME)
(EXE)
(DDE)
*ESR? common query
Cannot be written to
*ESR? common query
*CLS common command
Power-on
query
error
(QYE)
Bit 1
Bit 0
request operation
control complete
(OPC)
(RQC)
•
Bit 0 (operation complete) is set in response to the *OPC common
command. This bit is set when all operations are complete.
•
Bit 1 (request control) is always set to 0.
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•
Bit 2 (query error) is set when a query error occurs, for example, an attempt
is made to read the output queue when the output queue is empty or when
the data in the output queue is lost.
•
Bit 3 (device dependent error) is set by the meter to indicate that an error
has occurred that is not a command error, an execution error, or a query
error.
•
Bit 4 (execution error) is set when an execution error is detected by the
meter, for example, if a command parameter is out of the range of the
meter or a valid program message cannot be executed due to some
condition in the meter.
•
Bit 5 (command error) is set when a command error is detected by the
meter, for example, if a syntax error is detected in a program message, an
incorrect command header is received, or if an IEEE GET message is received
in the middle of a program message.
•
Bit 6 (user request) is always set to 0.
•
Bit 7 (power on) is set when an off-to-on transition occurs in the power
supply of the meter.
Standard Event Status Enable Register
The contents of the standard event status enable register determine which
events in the standard event status register are reflected in the event summary
bit (ESB) of the status byte register.
Read with
Written to with
Cleared by
Standard Event Status Enable Register
*ESE? common query
*ESE common command
Power-on
*ESE common command with a parameter 0
Queues
Input Queue
The input queue in the meter is a first-in-first-out (FIFO) queue and is 128
characters in length. Data bytes received from the controller are placed in the
input queue in the order received. When a full message meter is received, it is
transferred to the parser.
If the input queue becomes full while the GPIB is being used, the data
acknowledge signal (DAQ) is not sent to the GPIB controller until a character is
transferred from the input buffer to the parser. This ensures that no bytes in the
program message are lost. However, the RS232C interface has no DAQ signal
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and cannot be signaled when the input queue becomes full. Therefore,
characters sent to the MBR5 Meter are lost.
If a new program message is received before the response to a query in a
previous message is read, the output queue is cleared, MAV is set to false, and
the query error bit is set. This error is also referred to as an unterminated error.
Output Queue
Responses to query messages are placed in the output queue. This queue is 128
characters in length. When a response is placed in the output queue, the MAV
bit in the status register is set. The MAV bit is cleared when the response is sent.
Response messages are always terminated with the sequence <LF> and, if the
response is being sent through the GPIB, the EOI signal is set to true when the
last character in a response is sent.
If an attempt is made to read the output queue when it is empty and the
current program message does not contain a query, a query error bit is set.
Error Queue
The error queue is where errors are placed and it can contain up to 10 error
messages. Because it is a FIFO queue, the error returned when the error queue
is read is always the first error that occurred.
If more than 10 errors are put in the error queue, an overflow error occurs and
the last error in the queue is overwritten with error number -350 (Queue
Overflow). Each error in the queue consists of an error number and a brief error
message.
Description of Error Numbers
0
No error
No error has occurred.
-100
Command error
A command error was detected, but the parser cannot be more specific.
-130
Suffix error
An error was detected in the suffix sent with the command, but the parser
cannot be more specific.
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-220
Parameter error
An error was detected in a parameter, but the control block cannot be more
specific.
-240
Hardware error
A hardware error was detected, but the control block cannot be more specific.
-330
Self-Test error
The device failed a self-test.
-350
Queue overflow
The error queue has overflowed, and an error has occurred that cannot be
recorded.
-400
Query error
A query error was detected, but the parser cannot be more specific.
IEEE 488.2 Common Commands and the SCPI
Command Tree
IEEE 488.2 Common Commands
Command
Parameter
Response
Minimum
Maximum
*CLS
N/A
N/A
N/A
N/A
*ESE
Integer
N/A
0
255
*ESE?
N/A
Integer
0
255
*ESR?
N/A
Integer
0
255
*IDN?
N/A
String
N/A
N/A
*OPC
N/A
N/A
N/A
N/A
*OPC?
N/A
Integer
1
1
*RST
N/A
N/A
N/A
N/A
*SRE
Integer
N/A
0
255
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*SRE?
N/A
Integer
0
255
*STB?
N/A
Integer
0
255
*TST?
N/A
Integer
0
1
*WAI
N/A
N/A
N/A
N/A
SCPI Command Tree
All commands other than the IEEE 488.2 common commands are listed in the
following table.
Command
Parameters
Response
[:SOURce]
:WAVlength
Num Val| MIN|MAX|DEF
:WAVlength?
None|MIN|MAX|DEF
Num Val
[:NEXT]
:CHANnel
Num Val|MIN|MAX
:CHANnel?
None|MIN|MAX
Num Val
[:NEXT]
[:POWer]
:MODe
ABS|REL|BRM|DUL
:MODe?
ABS|REL|BRM|DUL
:READ?
Num Val
:FULL?
Num Val, String
:DETector
Num Val| MIN|MAX
:DETector?
None|MIN|MAX
Num Val
[:NEXT]
:DARK
:BR0
:READ?
Num Val
:STORe
:CLEar
:ALL
:SVL
:READ?
Num Val
:CLEar
:ALL
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:REFerence
:AWL
:SAVe
:REStore
:CLEar
:SYSTem
:ERRor[:NEXT]?
Num Val, String
:VERSion?
String
:CAPability?
String
:COMMunicate
:GPIB
[:SELF]
:ADDRess
Num Val
:COMMunicate
:GPIB
[:SELF]
:ADDRess?
Num Val
Description of Individual Commands
IEEE-488.2 Common Commands
Clear Status Command
Syntax
*CLS
Function
Clears the following queues and registers:
•
•
•
•
•
Error queue
Standard event status register
Status byte register
Operation event register
Questionable event register
If *CLS is sent immediately after a message terminating sequence,
both the output queue and the MAV bit in the status byte register
are cleared.
Example
*CLS
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Standard Event Status Enable Register Command
Syntax
*ESE<space><numeric value> where 0 ≤ <numeric value> ≤ 255
Function
Sets the bits in the standard event status enable register. The
numeric value is converted to a binary number. The bits of the
register are set to match the bit values of the binary number.
Example
*ESE 97 sets the standard event status enable register bits to
01100001.
Standard Event Status Enable Register Query
Syntax
*ESE?
Function
Returns the contents of the standard event status enable register as
an integer that, when converted to a binary number, represents the
bit values of the register.
Example
*ESE? returns 97 if the standard event status enable register is set
to 01100001.
Standard Event Status Register Query
Syntax
*ESR?
Function
Returns the contents of the standard event status register as an
integer that, when converted to a binary number, represents the bit
values of the register. The standard event status register is cleared
after *ESR? command.
Example
*ESR? returns 195 if the standard event status register is set to
11000011.
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Identification Query
Syntax
*IDN?
Function
The *IDN query returns a string value which identifies the
manufacturer, instrument type and firmware version.
Example
*IDN? Returns "JGR Optics Inc., MBR5, XXXXXXX, Y.YY"
Where: <XXXXXXX> = device serial number
<Y.YY> = firmware revision number
Operation Complete Command
Syntax
*OPC
Function
Causes the meter to set the OPC bit in the standard event status
register when all pending operations have been completed.
Example
*OPC
Operation Complete Query
Syntax
*OPC?
Function
Places a “1” in the output queue of the meter when all pending
operations have been completed. Because the “1” is not always
placed in the output queue immediately, the status byte register
should be polled and the MAV bit checked to determine if there is a
message available in the output queue.
Example
*OPC?
Reset Command
Syntax
*RST
Function
Meter is reset to the power-on condition.
Example
*RST
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Service Request Enable Command
Syntax
*SRE<space><numeric value> where 0 ≤ <numeric value> ≤ 63 and
128 ≤ <numberic value> ≤ 191.
Function
Sets the bits in the service request enable register. The numeric
value is converted to a binary number. The bits of the register are
set to match the bit values of the binary number.
Example
*SRE 154 sets the service request enable register bits to 10011010.
Service Request Enable Query
Syntax
*SRE?
Function
Returns the contents of the service request enable register as an
integer that, when converted to a binary number, represents the bit
values of the register.
Example
*SRE? returns 154 if the service request enable register is set to
10011010.
Read Status Byte Query
Syntax
*STB?
Function
Returns the contents of the status byte register as an integer that,
when converted to a binary number, represents the bit values of the
register. The bit value for bit 6 of the register is the MSS bit value,
not the RQS bit value.
Example
*STB? returns 170 if the status byte register is set to 10101010.
Self-Test Query
Syntax
*TST?
Function
Initiates a self-test of the meter and returns 0 if the meter passes
the self-test or 1 if it fails.
Example
*TST?
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*WAI Command
Syntax
*WAI
Function
Prevents the meter from executing any further commands or
queries until all previously pending operations have been
completed.
There are no consequences to this command because all commands
are executed sequentially; therefore, any subsequent commands
are completed by the time this command is parsed.
Example
*WAI
SCPI Commands
[:SOURce]:WAVlength
Syntax
[:SOURce]:WAVlength<space>[wavelength|MIN|MAX|DEF] OR
[:SOURce]:WAVlength[:NEXT]
Function
Switches to a specified or next available wavelength.
•
•
•
Example
no parameter or [:NEXT]: switches to the next available
wavelength
wavelength: switches to the specified wavelength in nm.
Other units can be specified
MIN, MAX or DEF: switches to the first, last or default
wavelength respectively.
WAV 1.55 um switches the meter’s output to 1550 nm.
[:SOURce]:WAVlength?
Syntax
[:SOURce]:WAVlength?<space>[MIN|MAX|DEF]
Function
Returns the current or specified output source wavelength in nm
•
•
Example
No parameter: returns the current wavelength
MIN, MAX or DEF: returns the first, last or default
wavelength respectively.
WAV? MIN returns: 1310.
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[:SOURce]:CHANnel
Syntax
[:SOURce]:CHANnel<space>[channel_number|MIN|MAX] OR
[:SOURce]:CHANnel[:NEXT]
Function
Switches the source output to a specified channel number
•
•
•
Example
no parameter or [:NEXT]: switches to the next channel
number
channel_number: switches to the specified by the
parameter channel number
MIN or MAX: switches to the first or last configured channel
number respectively.
CHAN 3 switches the meter to channel 3.
[:SOURce]:CHANnel?
Syntax
[:SOURce]:CHANnel?<space>[MIN|MAX]
Function
Returns the current or specified channel number
•
•
Example
No parameter: returns the current channel number
MIN or MAX: returns the first or last configured channel
number.
CHAN? returns: 3.
[:POWER]:MODe
Syntax
[:POWER]:MODe<space>[ABS|REL|BRM|DUL]
Function
Switches the meter between the following operation modes:
•
•
•
•
Example
ABS:
REL:
BRM:
DUL:
absolute power operation mode
relative power operation mode
backreflection operation mode
dual display operation mode.
MOD DUL switches the meter into dual display mode
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[:POWER]:MODe?
Syntax
[:POWER]:MODe?
Function
Returns the current operation mode.
Example
MOD? returns: DUL.
[:POWER]:READ?
Syntax
Function
Example
[:POWER]:READ?
Returns the current reading (power or BR) of the meter.
READ? returns -55.2 (the unit is in BR mode).
[:POWER]:READ:FULL?
Syntax
Function
Example
[:POWER]:READ:FULL?
Returns the current reading (power or BR) of the meter, the
current channel number, detector number and output
wavelength.
READ:FULL? returns -55.2, 5, 0, 1310 (the unit is in BR mode).
[:POWER]:DETector[:NEXT]
Syntax
[:POWER]:DETector<space>[detector_number|MIN|MAX] OR
[:POWER]:DETector[:NEXT]
Function
Switches to the specified detector number
•
•
•
Example
no parameter or [:NEXT]: switches to the next detector
number
detector_number: switches to the specified by the
parameter detector number
MIN or MAX: switches to the first or last configured detector
number respectively.
DET 2 switches to the detector number 2.
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[:POWER]:DETector?
Syntax
[POWER]:DETector?<space>[MIN|MAX]
Function
Returns the current or specified detector number
•
•
Example
No parameter: returns the current detector number
MIN or MAX: returns the first or last configured detector
number.
DET? returns: 2.
[:POWER]:DETector:DARK
Syntax
[:POWER]:DETector:DARK
Function
Measures and stores the custom ID value used in dark
measurements for all available detectors.
Example
DET:DARK takes the dark current measurement for all detectors.
[:POWER]:BR0:READ?
Syntax
Function
Example
[:POWER]:BR0:READ?
Returns the current BR0 value (custom or factory stored).
BR0:READ? returns: -65.5.
[:POWER]:BR0:STORe?
Syntax
[:POWER]:BR0:STORe
Function
Measures and stores the custom BR0 measurement for the
current source wavelength and output channel.
Example
BR0:STOR measures and stores the custom BR0 value.
[:POWER]:BR0:CLEAR
Syntax
[:POWER]:BR0:CLEAR
Function
Clears the custom BR0 value for the current source wavelength
and output channel.
Example
BR0:CLEAR clears the custom BR0 value
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[:POWER]:BR0:CLEAR:ALL
Syntax
[:POWER]:BR0:CLEAR:ALL
Function
Clears the custom BR0 value for all source wavelengths and all
output channels
Example
BR0:CLEAR:ALL clears all custom BR0 value
[:POWER]:SVL:READ?
Syntax
Function
Example
[:POWER]:SVL:READ?
Returns the current setup via loss value or 0.
SVL:READ? returns: 0.15
[:POWER]:SVL:CLEAR
Syntax
[:POWER]:SVL:CLEAR
Function
Clears the setup via loss value for the current source wavelength
and output channel.
Example
SVL:CLEAR clears the setup via loss value
[:POWER]:SVL:CLEAR:ALL
Syntax
[:POWER]:SVL:CLEAR:ALL
Function
Clears the setup via loss values for all source wavelengths and all
output channels
Example
SVL:CLEAR:ALL clears all setup via loss values
[:POWER]:REFerence
Syntax
[:POWER]:REFerence
Function
Takes a relative power reference at current detector, current
wavelength and current channel.
Example
REF takes the reference.
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[:POWER]:REFerence:AWL
Syntax
[:POWER]:REFerence:AWL
Function
Takes a relative power reference at current detector with
current channel, for all wavelengths.
Example
REF:AWL takes the reference for all wavelengths.
[:POWER]:REFerence:ALL
Syntax
[:POWER]:REFerence:ALL
Function
Takes a relative power reference at current detector for all
wavelengths and all channels.
Example
REF:ALL takes the reference for all wavelengths and all channels
[:POWER]:REFerence:SAVe
Syntax
Function
Example
[:POWER]:REFerence:SAVe
Saves Insertion loss, BR0 and Setup via loss reference values to
flash. These values can be restored on the power on if the meter
is factory set for this function.
REF:SAV saves all reference values to flash.
[:POWER]:REFerence:REStore
Syntax
[:POWER]:REFerence:REStore
Function
Restores Insertion loss, BR0 and Setup via loss reference values
from flash.
Example
REF:RES reads and restores IL, BR0 and Setup via loss values.
[:POWER]:REFerence:CLEar
Syntax
[:POWER]:REFerence:CLEar
Function
Restores default Insertion loss, BR0 and Setup via loss reference
values on the meter.
Example
REF:CLE restores default reference values.
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:SYSTem:ERRor?
Syntax
:SYSTem:ERRor?
Function
Returns the error number and an error message from the error
queue. See the Error Queue section, for a list of error numbers and
their associated messages.
Example
:SYST:ERR? returns: 0, “No error”.
:SYSTem:VERSion?
Syntax
:SYSTem:VERSion?
Function
Returns the formatted numeric value the of the SCPI version
number.
Example
:SYST:VERS? returns: 1999.0.
:SYSTem:CAPability?
Syntax
:SYSTem:CAPability?
Function
Returns the string specifying the capability of the device.
Example
:SYSTem:CAPability? returns: OPTICAL INSTRUMENT
:SYSTem:COMMunicate:GPIB[:SELF]:ADDRess
Syntax
:SYSTem:COMMunicate:GPIB[:SELF]:ADDRess<space><numeric_val
ue>
Function
Sets the GPIB address. The factory-set GPIB address is 21. When the
address is changed, the interface immediately responds to the new
address.
Example
:SYST:COMM:GPIB:ADDR 7
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:SYSTem:COMMunicate:GPIB[:SELF]:ADDRess?
Syntax
:SYSTem:COMMunicate:GPIB[:SELF]:ADDRess?
Function
Returns the GPIB address.
Example
:SYST:COMM:GPIB:ADDR? returns 7.
JGR Legacy Device Specific Commands
Table 10: Device-Specific Command List
1, ABS
Switch to Absolute power mode
2, REL
Switch to Relative power mode
3, BRM
Switch to BR Mode
4, DUL
Switch to Dual display Mode
5, MODE?
Query the current operation MODE
6, SWL
Switch Wavelength
7, SSC
Switch Wavelength by Sequence
8, SCH
Switch Channel
9, DET
Switch Detector
10, BRZS
Store BR0 (BR Zero Store)
11, BRZC
Clear BR0 (BR Zero Clear)
12, DARK
Store Dark Current
13, TREF
Take relative power Reference
14, TMF
Transmit a Measurement in Full format
15, TDO
Transmit Data Only
16, LCL
Return to Local control
JGR Legacy Device-Specific Command Description
ABS
The ABS command will switch the meter to absolute
power mode.
Interface:
GPIB and RS-232/USB
Syntax:
“ABS”<CR>
Returned Format:
None
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REL
The REL command will switch the meter to relative
power mode.
Interface:
GPIB and RS-232/USB
Syntax:
“REL”<CR>
Returned Format:
None
BRM
The BRM command will switch the meter to BR
mode.
Interface:
GPIB and RS-232/USB
Syntax:
“BRM”<CR>
Returned Format:
None
DUL
The DUL command will switch the meter to dual
display mode.
Interface:
GPIB and RS-232/USB
Syntax:
“DUL”<CR>
Returned Format:
None
MODE?
The MODE? command queries the current operation
mode, query return “ABS”, “REL”, “BRM” or “DUL”
for the four different operating modes.
Interface:
GPIB and RS-232/USB
Syntax:
“MODE?”<CR>
Returned Format:
<Mode><NL> where <Mode> = “ABS”, “REL”, “BRM”,
or “DUL”
SWL
The SWL command switches the meter to the next
wavelength or to a specific wavelength using the
wavelength (um) as reference.
Interface:
GPIB and RS-232/USB
Syntax:
“SWL”<CR> (switches to next wavelength)
“SWL x.x”<CR> (where x.x = 0.8, 1.3, 1.4, 1.5 or 1.6).
Example, “SWL 1.3” switches to 1310nm
Returned Format:
None
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SWL?
Query returns the current wavelength number in
“x.x” format, valid returns are 1.3 for 1310nm, 1.4 for
1480nm, 1.5 for 1550nm, 1.6 for 1625nm and 0.8 for
850nm.
Interface:
GPIB and RS-232/USB
Syntax:
“SWL?”<CR>
Returned Format:
<x.x><NL> where <x.x> = “0.8”, “1.3”, “1.4”, “1.5”, or
“1.6”
SSC
The SSC command switches the meter to the next
wavelength or to a specific wavelength using the
position number/sequence as reference. The
position of a laser in a particular meter will depend
on the number of lasers in the meter.
Interface:
GPIB and RS-232/USB
Syntax:
“SSC”<CR> (switches to next wavelength)
“SSC x”<CR> (where x = 1, 2, 3, or 4). Example, “SSC
2” switches to the second wavelength (ie on a 2wavelength MBR5 1310/1550, "SSC 2" would switch
to 1550nm, however on a 1310/1480/1550/1625
"SSC 2" would switch to 1480nm)
Returned Format:
None
SSC?
Query returns the current wavelength position
number in “x” format.
Interface:
GPIB and RS-232/USB
Syntax:
“SSC”<CR> (switches to next wavelength)
“SSC?”<CR>
Returned Format:
<x ><NL> where < x> = “1”, “2”, “3”, or “4”
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SCH
The SCH command can switch the meter to the next
channel or to a specific channel
Interface:
GPIB and RS-232.
Syntax:
“SCH”<CR> (switches to next channel)
“SCH xx”<CR> (where xx = 01, 02, 03,,,,23, 24).
Example, “SCH 18” switches to channel 18
Returned Format:
None
SCH?
Query returns the current channel number in “xx”
format, Valid returns are 01, 02, …12 (or 24, 36, 48
which is the total channel number)
Interface:
GPIB and RS-232.
Syntax:
“SCH?”<CR>
Returned Format:
<xx><NL> where <xx> = “01”, “02”, … “48”
DET
The DET command can switch the meter to the next
detector or to a specific detector
Interface:
GPIB and RS-232
Syntax:
“DET”<CR> (switches to next detector)
“DET xx”<CR> (where xx = 00, 02, 03,,,,4). Example,
“DET 1” switches to detector 1
Returned Format:
None
DET?
Query returns the current detector number in “xx”
format, Valid returns are 00, 01, 02…
Interface:
GPIB and RS-232
Syntax:
“DET?”<CR>
Returned Format:
<xx><NL> where <xx> = “00”, “01”, …
BRZS
The BRZS command will store BR0. The meter needs
to be in BR mode or dual display mode for the
command to succeed.
Interface:
GPIB and RS-232/USB
Syntax:
“BRZS”<CR>
Returned Format:
None
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BRZC
The BRZC command will clear BR0. The meter needs
to be in BR mode or dual display mode for the
command to succeed.
Interface:
GPIB and RS-232/USB
Syntax:
“BRZC”<CR>
Returned Format:
None
DARK
The DARK command will store dark current. The
meter needs to be in POWER mode for the command
to succeed.
Interface:
GPIB and RS-232/USB
Syntax:
“DARK”<CR>
Returned Format:
None
TREF
The TREF command will take relative power
reference. The meter needs to be in relative power
mode for the command to succeed.
Interface:
GPIB and RS-232/USB
Syntax:
“TREF”<CR>
Returned Format:
None
TMF
The TMF command will initiate a measurement
transmission in full display format addition with
current wavelength.
Interface:
GPIB and RS-232/USB
Syntax:
“TMF”<CR>
Returned Format:
Full LCD display plus current wavelength in x.x
format.
Example: “BR=-60.2dB 1.3”
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TDO
The TDO command will cause the meter to transmit
the data only. If in BR mode, the data is the BR, in
Power mode, the data is the IL (or absolute power),
and in Dual Display mode, the data is both the BR
and IL.
Interface:
GPIB and RS-232/USB
Syntax:
“TDO”<CR>
Returned Format:
“-xx.x” for BR mode, “-xx.xx” for power mode, “ -xx.x
/ -xx.xx “ for dual mode
LCL
The LCL command is used to return the remote
control status to local front panel control. Same
function as with the “Local” key on front panel.
Interface:
GPIB and RS-232/USB
Syntax:
“LCL”<CR>
Returned Format:
None
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