Untitled - Gentec-EO

Untitled - Gentec-EO
M-LINK User’s Manual
Revision 2.0
i
WARRANTY
The Gentec-EO PC M-LINK has a one-year warranty (from date of shipment) against material and/or
workmanship defects, when used under normal operating conditions. The warranty does not cover
damages related to battery leakage or misuse.
Gentec-EO Inc. will repair or replace at Gentec-EO Inc.’s option, any M-LINK that proves to be defective
during the warranty period, except in the case of product misuse.
Any attempt by an unauthorized person to alter or repair the product voids the warranty.
The manufacturer is not liable for consequential damages of any kind.
In case of malfunction, contact your local Gentec-EO distributor or nearest Gentec-EO Inc. office to obtain
a return authorization number. The material should be returned to:
Gentec Electro-Optics, Inc.
445, St-Jean-Baptiste, Suite 160
Québec, QC
Canada G2E 5N7
Tel: (418) 651-8003
Fax: (418) 651-1174
e-mail: service@gentec-eo.com
Website: www.gentec-eo.com
CLAIMS
To obtain warranty service, contact your nearest Gentec-EO agent or send the product, with a description
of the problem, and prepaid transportation and insurance, to the nearest Gentec-EO agent. In any cases
you will need a RMA number to return your equipment. Gentec-EO Inc. assumes no risk for damage
during transit. Gentec-EO Inc. will, at its option, repair or replace the defective product free of charge or
refund your purchase price. However, if Gentec-EO Inc. determines that the failure is caused by misuse,
alterations, accident or abnormal conditions of operation or handling, you will be billed for the repair and
the repaired product will be returned to you, transportation prepaid by the customer.
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SAFETY INFORMATION
Do not use the PC M-LINK with the M-LINK if the device or the detector looks damaged, or if you suspect
that the M-LINK is not operating properly.
Appropriate installation must be done for water-cooled and fan-cooled detectors. Refer to the specific
instructions for more information. The user must wait for a while before handling these detectors after
power is applied. Surfaces of the detectors get very hot and there is a risk of injury if they are not allowed
to cool down.
Note:
Caution:
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his own expense.
Changes or modifications not expressly approved in writing by Gentec-EO Inc. may
void the user’s authority to operate this equipment.
SYMBOLS
The following international symbols are used in this manual:
Refer to the manual for specific Warning or Caution information to avoid any damage
to the product.
DC, Direct Current
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TABLE OF CONTENTS
WARRANTY ............................................................................................................................................................. I
CLAIMS ................................................................................................................................................................... I
SAFETY INFORMATION .......................................................................................................................................... II
SYMBOLS ............................................................................................................................................................... II
1
THE M-LINK SINGLE CHANNEL LASER POWER/ENERGY METER ...................................................................... 1
1.1
1.2
1.3
2
INTRODUCTION ..................................................................................................................................................1
SPECIFICATIONS ..................................................................................................................................................2
CONNECTOR DESCRIPTIONS ..................................................................................................................................5
GETTING STARTED .......................................................................................................................................... 8
2.1
QUICK POWER AND ENERGY MEASUREMENT PROCEDURE ............................................................................................8
2.2
USER INTERFACE ..........................................................................................................................................10
2.2.1
Start the PC M-LINK software on the PC. .............................................................................................10
2.2.2
Make a connection with the M-LINK....................................................................................................10
2.2.3
The Energy Setup Window ...................................................................................................................11
2.2.4
The Wattmeter Setup Window ............................................................................................................12
2.2.4.1
2.2.4.2
2.2.4.3
2.2.4.4
2.2.4.5
2.2.4.6
2.2.4.7
2.2.4.8
2.2.4.9
2.2.4.10
2.2.4.11
2.2.4.12
2.2.4.13
2.2.4.14
2.2.4.15
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.2.9.1
2.2.9.2
2.2.9.3
2.2.10
2.2.11
2.2.12
2.2.13
3
The Measurement ............................................................................................................................................ 12
Range & Autorange .......................................................................................................................................... 13
Trigger Level ..................................................................................................................................................... 13
Send data ......................................................................................................................................................... 13
Log data............................................................................................................................................................ 13
Firmware .......................................................................................................................................................... 14
Model and S/N ................................................................................................................................................. 14
Min Lambda & Max Lambda ............................................................................................................................ 14
AREA................................................................................................................................................................. 14
Corrections .................................................................................................................................................. 14
Update Firmware. ........................................................................................................................................ 15
Zero Baseline ............................................................................................................................................... 15
Mode ........................................................................................................................................................... 15
Null .............................................................................................................................................................. 15
Display ......................................................................................................................................................... 16
The statistics display ............................................................................................................................16
The Noise Suppression .........................................................................................................................17
The Histogram......................................................................................................................................18
The Scope Display ................................................................................................................................19
The Scope Settings ...............................................................................................................................20
Time: ................................................................................................................................................................ 20
Power or Energy: .............................................................................................................................................. 20
Graphic options ................................................................................................................................................ 20
Averaging .............................................................................................................................................21
The Needle ...........................................................................................................................................22
Detecting missing laser pulses. ............................................................................................................23
Recommended PC ................................................................................................................................24
INSTALLATION AND COMMUNICATION ....................................................................................................... 25
3.1
INSTALLATION ..................................................................................................................................................25
3.1.1
To Install USB drivers for Windows™: ..................................................................................................25
3.2
SETTING UP COMMUNICATION TO THE M-LINK .....................................................................................................26
3.2.1
Connecting the PC M-LINK to the M-LINK ............................................................................................26
3.2.1.1
Download the PC M-LINK file and execute it ................................................................................................... 26
M-LINK User’s Manual
3.2.1.2
3.2.2
3.2.2.1
3.2.2.2
3.2.3
3.2.3.1
3.2.3.2
3.2.3.3
3.2.3.4
3.2.3.5
3.2.4
3.2.4.1
3.2.5
3.2.6
4
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Installation ....................................................................................................................................................... 26
Running PC M-LINK ..............................................................................................................................26
Start the PC M-LINK.......................................................................................................................................... 26
Exit the PC M-LINK program ............................................................................................................................. 26
Connect to the M-LINK with HyperTerminal ........................................................................................26
Install the USB drivers ...................................................................................................................................... 26
Verify COM Port ............................................................................................................................................... 26
To echo commands .......................................................................................................................................... 27
Test the connection ......................................................................................................................................... 27
HyperTerminal settings shortcut ...................................................................................................................... 27
Serial Commands .................................................................................................................................27
M-LINK Serial commands ................................................................................................................................. 27
Data Format used by M-LINK in wattmeter mode. ..............................................................................34
Data Format in Energy Mode ...............................................................................................................34
MAINTENANCE ............................................................................................................................................. 39
4.1
USB INSTALLATION FOR THE M-LINK ...................................................................................................................39
5
DECLARATION OF CONFORMITY .................................................................................................................. 40
6
APPENDIX A ................................................................................................................................................. 41
6.1
7
ATTENUATOR/DIFFUSER CALIBRATION PROCEDURE .................................................................................................41
APPENDIX B.................................................................................................................................................. 43
7.1
7.2
7.3
RECYCLING AND SEPARATION PROCEDURE. ............................................................................................................43
SEPARATION: ...................................................................................................................................................43
DISMANTLING PROCEDURE: ................................................................................................................................43
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LIST OF ILLUSTRATIONS
FIG 1.1 PC M-LINK USER’S INTERFACE............................................................................................................ 1
FIG. 1-2 M-LINK CONNECTORS (USB SIDE) ..................................................................................................... 5
FIG. 1-3 M-LINK CONNECTORS (DB-15 SIDE) .................................................................................................. 5
FIG. 1-4 ACCURATE EXTERNAL TRIGGER ZONE .................................................................................................. 6
FIG. 1-5 THE ENERGY SET-UP W INDOW ......................................................................................................... 11
FIG. 1-5 THE W ATTMETER SETUP W INDOW .................................................................................................... 12
FIG. 1-6 THE STATISTICS DISPLAY ................................................................................................................. 16
FIG. 1-7 THE HISTOGRAM DISPLAY ................................................................................................................. 18
FIG. 1-8 THE SCOPE DISPLAY ........................................................................................................................ 19
FIG. 1-9 THE AVERAGING DISPLAY ................................................................................................................. 21
FIG. 1-10 THE NEEDLE DISPLAY..................................................................................................................... 22
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THE M-LINK SINGLE CHANNEL LASER POWER/ENERGY METER
1.1 Introduction
To obtain full performance from the M-LINK and the PC M-LINK, we recommend that you read this
manual carefully.
The PC M-LINK software transforms your PC screen into a large M-LINK screen enabling you to control
and see your information from a distance and transfer data to a PC for sophisticated data analysis.
The M-LINK is a microprocessor-based power and energy meter that uses the latest technology to
provide a multitude of options in a user-friendly environment. It is a complete power and energy meter
that can provide a statistical analysis of your measurements.
There is no need to enter the head specifications when connecting the new Gentec-EO power or energy
detector heads, for head version 5 and above. The M-LINK is already internally set up to accept all the
Gentec-EO wattmeter, Photodiode and Joulemeter heads with a DB-15 connector head version 5, 6 and
7. The M-LINK accepts the PE, UM, PH, QE series or an XLE-4.
Fig 1.1 PC M-LINK user’s interface
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Unpacking
Each Gentec-EO M-LINK is thoroughly tested and calibrated prior to shipment.
Visually inspect every M-LINK unit after removing it from the shipping containers. If you see any damage,
retain all packaging materials and shipping receipts. Any damage claim should be made promptly to the
transportation company. Notify the nearest Gentec-EO representative concerning the claim, so that any
repair or replacement can be arranged as soon as possible.
You can download the PC M-LINK program from our website. Go to the Downloads section of our
website: www.gentec-eo.com/downloads. Click on the file name and download it to your PC. The
specific actions necessary vary between browser and browser settings. After it is transferred, open the
file on your PC and follow the instructions to uncompress and install it.
1.2 Specifications
The following specifications are based on a one-year calibration cycle, an operating temperature of 18 to
28ºC (64 to 82ºF) and a relative humidity not exceeding 80%.
Table 1-1 List of Specifications
Power meter specifications
Power Range
Power Scales
4 pW to 30 kW
[2]
(photo diode head)
Power Scales
[2]
(thermal head)
Pyroelectric in power
mode range (UM-B)
Resolution (digital)
Monitor Accuracy
1 nW, 3nW, 10nW, 30nW, 100nW, 300nW, 1µW, 3µW, 10µW, 30µW,
100µW, 300µW, 1mW, 3mW, 10mW, 30mW, 100mW, 300mW, 1W, 3W
300uW, 1mW, 3mW, 10mW, 30mW, 100mW, 300mW, 1W, 3W, 10W,
30W, 100W, 300W, 1kW, 3kW, 10kW, 30 kW
100µW, 300µW, 1mW, 3mW, 10mW, 30mW, 100mW, 300mW
Current scale/3000
±
0.5 % ±2 digits
Response Time
[2]
(accelerated)
Statistics
Data Storage
1
Head dependant
Current value, Max, Min, Average, Std Dev., RMS stability, PTP stability.
Continuous on hard drive
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Energy meter specifications
Energy Range
Energy Scales
30 fJ to 30 kJ
[2]
300fJ, 1 pJ, 3 pJ, 10 pJ, 30 pJ, 300pJ, 1 nJ, 3 nJ, 10 nJ, 30 nJ, 100nJ,
300nJ, 1 uJ, 3 uJ,10uJ, 30uJ, 100µJ, 300µJ, 1mJ, 3mJ, 10mJ, 30mJ
(photo diode head)
Energy Scales
[2]
3mJ, 10mJ, 30mJ, 100mJ, 300mJ, 1J, 3J, 10J, 30J, 100J, 300J, 1kJ, 3kJ,
10kJ, 30kJ
(thermal head)
Resolution (digital)
[2]
Current scale/3000
[3]
1.0 %±2 digits < 1 kHz
Default Trigger Level
2%
Software Trigger Level
0.1% to 99%, 0.1% resolution
Accuracy
Repetition
[4]
Frequency
Frequency
Measurement
Statistics
Data Storage
1.0 kHz for data acquisition in real time with time stamp, no missing point
Accurate frequency measurement up to 1kHz
0-1000 Hz: 0.1% accuracy
Current value, Max, Min, Average, Std Dev., RMS stability, PTP stability,
Pulse #, Repetition Rate, Avg Power.
Continuous on Hard drive
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General Specifications
Digital Display
Display Rate
PC
3 Hz numeric display
3 Hz bar graph display and needle display
Scope
Data Displays
User input correction
factors
Analog Output
500 divisions
Real time, Scope, Averaging, Statistics, Digital tuning needle, Setup
1 multipliers and 1 offsets (7 digits floating point)
amplified signal of the head: 0 – 1.832 volt, ± 4% for wattmeter
± 2% for joulemeter
Energy heads and power heads are offset by approximately 626 mV
Radiometer heads are offset by 1.25V
Positive External
trigger
External trigger
pulse width
4.5 to 10 V @ 20 mA, optically isolated.
0.7 us minimum, no maximum time.
Internet Upgrades
Yes
PC Serial Commands
USB
No missing point
throughput serial
frequency
1000 Hz
See rep rate note about being PC dependant
Dimensions
Weight
Power Supply
106 mm(W) x 34 mm (H) x 147 mm (D)
0.424 kg
USB
1
The 2.5µV bias can induce an error into low power measurements with low sensitivity detectors. It is
essential to use the Zero Offset to rezero the M-LINK before making a measurement in these conditions.
It is always good practice to use the Zero Offset. See section 2.2.
2
Varies with detector head.
3
Including linearity.
4
This is PC dependant. A PC with an Intel Duo Core processor and a 2.4GHz clock speed with
Windows XP can run up to 1300 Hz. A Dell laptop with a Pentium and 1.2GHz clock with Windows XP
can only run at 800Hz. Windows 7 machines may experience lower rates. The application software warns
the user if the application cannot keep up and recommends to reduce the rep rate.
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1.3 Connector Descriptions
Fig. 1-2 M-LINK Connectors (USB side)
Fig. 1-3 M-LINK Connectors (DB-15 side)
.
1-
USB INTERFACE CONNECTOR:
This interface allows remote control and data transfers between the M-LINK and a computer
that has a USB communication port.
2-
External trigger:
The Input connector is a Female BNC. The External trigger is TTL compatible. The monitor
detects a trigger on the rising or falling side of the external trigger signal. The polarity is user
selectable. To measure accurately, the trigger must be just before the laser pulse, or just after.
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For Example:
A QE12SP-S-MT has a 20 s rise time.
The External trigger must be 25 s before or 19 s after the laser pulse.
Fig. 1-4 Accurate external trigger zone
A QE12SP-S-MB has a 400 s rise time.
The External trigger must be 80 s before or 80 s after the laser pulse.
6
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Status LED:
The LED will turn on if the M-LINK is under power. The LED will flash if the head is not
connected.
4-
Analog-out:
The analog output of the M-LINK is the amplified signal from the detector head, that the ADC
sees. For power heads, the output = Vmeasured/Current scale * 1.832 + Voff Volts. It is
recommended to block off any optical power, make a zero offset and note the V off (Voff is
around 0.626V), it is not anticipated. For joulemeter heads, the output will follow the
joulemeter pulse, use an oscilloscope or an acquisition card to measure the signal. The
formula is (Vmax-Vmin)*1.832. Vmax is the maximum of the pulse. Vmin is the voltage just before
the pulse starts to rise.
5-
PROBE INPUT JACK:
The M-LINK uses a DB-15 female connector to mate with the detector heads (probes).
The M-LINK can take advantage of our Personal wavelength correction™. It reads the
memory in the Smart Interface connector to provide a wavelength correction that is based on
spectral data measured from that specific detector.
Supported Heads version
Power Detector
Photodiode Detector
Energy detector
Active photodiode (PHXB and PEXB)
≥5
≥8
≥6
≥1
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The supported head are equipped with an “intelligent” DB-15 male connector that mates
directly with the DB-15 female connector. They do not require an adaptor.
Energy detector heads prior to version 4 have a BNC connector. Contact your vendor for a
hardware upgrade.
WARNING: This DB-15 connector, though similar to that of the former TPM-310 and TPM-330
monitors, is incompatible with the power detector heads of PS-310 Series Version 1
and PS-330 Series Version 1. These heads use a different technology and do not have
the same pin-out configuration.
Any attempt to modify connectors of the early version heads to mate with the M-LINK could
result in damage to the monitor.
2
Getting Started
This section contains important information concerning the installation and operation of the M-LINK.
The M-LINK is delivered ready to use. Just insert a detector head in the DB-15 Detector Input Jack,
insert the USB cable into the M-LINK and into the PC, and start the software.
2.1 Quick power and energy measurement procedure
This section applies to all M-LINK versions. It will show you the fastest way of making a laser power
and energy measurement with the M-LINK and a Gentec-EO power or energy detector.
The monitor automatically recognizes all the Gentec-EO supported heads. All custom technical data
required for optimum operation of the detector will be automatically downloaded from the EEPROM in
the DB-15 connector. This data includes sensitivity, model, serial number, version, wavelength
correction factors, and time response.
The first 11 steps are for M-LINK initialization, steps 12 to 14 refer to the PC M-LINK:
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1- Install the power or energy detector head on its optical stand.
2- Turn the M-LINK off (unplug it) and connect a supported head to the M-LINK using the
Detector INPUT DB15.
3- The M-LINK reads the head when a new one is connected. Power down is not required but you
need to restart the application.
4- To avoid any information loss, be sure not to insert a head while the M-LINK is being poweredup or while you send the Reset Device command.
5- Slide the latch to the left to lock the connector into place.
6- Switch the M-LINK ON (plug it in).
7- Power heads default the M-LINK to power measurement; energy heads default the M-LINK to
energy measurement.
8- Remove the head’s protective cover.
Put the detector head into the laser beam path. The entire laser beam must be within the
sensor aperture. Do not exceed maximum specified densities, energies or powers. For the
most accurate measurement, spread the beam across 60% to 80% of the sensor area.
Attention:
Power heads can be used with both CW and pulsed lasers.
Energy heads can only be used with pulsed lasers.
9-
For power heads (using the M-LINK), go to step 8. For energy heads, go to step 13.
Adjusting the zero (steps 8 to 10)
10- Block off laser radiation to the detector.
11- The power read by the PC M-LINK when no laser beam is incident on the detector may not be
exactly zero. The detector is either not thermally stabilized OR there was a heat source in the
field of view of the detector when you turned on the M-LINK.
12- To reset the zero, wait until the reading has stabilized, right click and select Zero Offset. You
are now ready to make an accurate measurement.
Notes:
•
Refer to specific power detector documentation for complete installation and operating
instructions.
•
The power detectors are thermal sensors sensitive to temperature variations.
For high-precision measurements, we recommend:
•
Allowing the power detector temperature to stabilize before zeroing the M-LINK.
•
Not touching the detector head when handling the power detector. Touch the stand.
•
Avoiding forced airflow or drafts around the detector.
13- Apply the laser beam to the detector head. The laser beam average power or energy will be
displayed on the computer screen.
14- If the USB drivers and/or PC M-LINK have not been installed, install the USB drivers (see 3.1.1)
then install PC M-LINK (self-directed).
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15- Start the PC M-LINK software on the PC. Click Start / Programs /GENTEC-EO/ PC M-LINK.
16- The PC M-LINK will automatically detect the M-LINK com port, if it fails, select the correct COM
Port (see section 3.2.3.2) and click Reconnect. You should see values pertaining to the current
settings on the PC M-LINK.
2.2 USER INTERFACE
2.2.1
Start the PC M-LINK software on the PC.
Click Start / Programs /GENTEC-EO/ PC M-LINK Software.
2.2.2
Make a connection with the M-LINK
The PC M-LINK will automatically detect the M-LINK com port, if it fails, select the correct COM
Port (see section 3.2.3.2)
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The Energy Setup Window
Fig. 1-5 The Energy Set-up Window
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The Wattmeter Setup Window
Fig. 1-5 The Wattmeter Setup Window
2.2.4.1
The Measurement
In Power mode
The Current value is updated at 3Hz.
When you change the scale, the acquisition and all display modes stop for a few milliseconds.
In Energy mode
The Current value is updated at 3Hz. But all data in the statistics are updated at up to 1 kHz in
real time. Single shot measurement is always Valid. When you change the scale you might have
a false measurement but the next measurement is accurate. There is no need for “Zero offset” in
energy mode because the M-LINK compensates for an analog drift as long as the voltage is in
range of the analog to digital converter.
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When you change the scale, the acquisition and all display modes will stop for a few milliseconds.
2.2.4.2
Range & Autorange
The available range depends on the head ranges and the monitor's physical range.
find the best measurement scale.
2.2.4.3
Autorange tries to
Trigger Level
The trigger level only works if an energy detector head is connected or if a power detector head is used in
Pulse Energy (Calorimeter) mode. This option allows you to change the Trigger Level from 2% of the
full-scale default value. This proves to be especially useful in noisy environments. Acceptable values
range from 0.1% to 99% in 0.1% increments. Caution should be taken when choosing a lower trigger
level than the 2% default value in a high noise environment. You have to disable the autoscale in order
to change the trigger level. When Auto range is turned on it resets the trigger to 2%.
Caution! If you select a high value trigger level the M-LINK may not be able to detect all the values of
widely varying energy levels in auto range mode. The auto range function uses the energy level of the
last pulse to set the scale level. Therefore, it will not detect the next pulses, if they are lower than the
trigger level. As a result, the auto range may become caught on a high scale value. To avoid this
problem, select a lower value for the trigger level, change the scale manually, or reset the auto range
mode by reselecting auto in the Range menu.
Erratic triggering?
In electrically noisy environments, it is possible that the M-LINK will inadvertently trigger on the noise. If it
does, increase the trigger level to 3% or higher if necessary.
It is always good practice to reduce electrical noise generation, or shield the detector and monitor, when
measuring very low pulse energies.
You can also set the M-LINK to be triggered externally, via the BNC port. Just Select EXTERNAL for the
trigger Source. It is possible to select the trigger polarity. Positive is a trigger source that goes low to
High. Negative is for a trigger source that goes high to low.
2.2.4.4
Send data
This commands the M-LINK to Send data.
2.2.4.5
Log data
This command logs data on your PC Hard drive. The log is the same output as the Graphic. Set
the Graphic to continuous. Select a file name and path to store the data. Press Log Data to log
the data. The software will continue logging data until you close the file. Reset the Graphic to
continuous if you want a continuous time stamp. Once you do so, the software will continue to
use that file until you close it.
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Firmware
The firmware version of your M-LINK.
2.2.4.7
Model and S/N
The head name and serial number.
2.2.4.8
Min Lambda & Max Lambda
The available minimum and maximum wavelengths of the head (in nanometer).
2.2.4.9
AREA
The default Area is 0.707e-1. You have to enter the area of your head manually. Activate the Area
2
Correction in order to have your measurement in J/cm .
2.2.4.10 Corrections
The user can apply a multiplier and an offset value to the detector reading. Correction factors are most
useful when sampling a percentage of a powerful laser beam or correcting for absorption along an optical
chain. The menu displays the values of the correction factors that are being applied to the
measurements.
Multiplier & offset: Correction factor to be applied to the measurement. The Formula is (Value *
Multiplier) + Offset. The default value for the multiplier is 1, and the default for the offset is 0. For
example, if you are measuring the laser beam passing through the 99.9% back reflector of a laser (giving
th
1/1000 of the real value), choose Multiplier and enter 1000 in the dialog box. The M-LINK displays the
laser’s power rather than the measured 0.1% sample on the main display.
It is essential to make sure that the actual measured value also complies with the power and energy limits
of the detector head. The auto range option is the default selection. You can select a specific range but
it must always be based on the actual physical measured values and not on the corrected value. Of
course, the displayed values and the display scale selection are then calculated to take into account the
correction factors.
Note that the Statistics are calculated for the corrected values only.
To disable the correction factor, touch the check box corresponding to the correction factor (multiplier or
offset) in the Corrections menu window.
Average: The number of measurements to be averaged. In wattmeter mode, it’s the average off a 10Hz
measurement. Click the Display Averaging to active the averaging.
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2.2.4.11 Update Firmware.
The M-LINK has the ability to update its firmware.
Step #1: Download the new firmware in the Downloads section on the Gentec-EO web site.
Step #2 Select “LOAD NEW FIRMWARE FILE” in the Upgrade Firmware utility, Select the file
you have just downloaded.
Step #3 Select “Update firmware”, we recommend not to make anything on your computer while
the M-LINK is updating for about 5 minutes. If you have a laptop, connect the external power
supply.
2.2.4.12 Zero Baseline
The M-LINK has the ability to zero the baseline of the joulemeter in case the offset is too high. This
function should only be used if you see an invalid OUT on a selected range, this should not occur very
often.
2.2.4.13 Mode
The Mode button enables you to activate the Energy mode with the thermal heads.
2.2.4.14 Null
In the Joulemeter window it is a math subtraction. When the user presses the button, whatever reading is
current will be used as the subtraction value until the button is released. This feature is needed to make
accurate measurements when using Noise suppression on very noisy signals. It does the same thing as
entering the negative value of a reading in the offset control, it just makes it easier.
For example:
Connect the external trigger of your laser to the M-LINK. Block the Laser beam. Select the Noise
Suppression. Start the statistics until the reading is stable. Make a Null, this will cancel the average noise.
Unblock the laser beam. Make the measurement.
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2.2.4.15 Display
You can Select the Display mode of your choice. The possible display modes are: Statistics, Graphic,
Histogram, Setup and Needle.
2.2.5
The statistics display
Click on Start to begin the statistics. The Batch Size is the number of measurements the statistics
analyses. Select Continuous if you want to collect statistics continually. If the statistics In Range LED
goes red, one of the points went out of range and the statistics values may be incorrect. In Energy mode
the average power can’t be computed if the rep rate is lower than 1 Hz. The M-LINK can’t measure rep
rates lower than 1 Hz.
Fig. 1-6 The Statistics Display
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The Noise Suppression
The M-LINK has a special proprietary algorithm that can lower the noise induced error when
reading low level energy, or energy readings of any level with noise present. This feature greatly
reduces the effect of noise on the peak to peak measurement in Joulemeter or Radiometer mode.
To activate this special function, select the number of sampling size that you want to use. M-link
will need to measure the number of pulse selected in the Sampling Size before the algorithm will
settle to the noise suppressed value. Once the readings have stabilized, any subsequent reading
will be stable until the Sampling Size is changed. The system will then stabilize to the new value.
Larger Sampling Sizes will result in more noise suppression. To see the stabilizing effect, start
the statistics and restart the batch while watching the RMS or PTP Stability until you have a
stable reading. Noise suppression works best using the external trigger. This function will
greatly improve the accuracy of the lowest scale or in any scale when used in a noisy
environment.
You can also use the NULL function with Noise Suppression to improve the accuracy
For example:
Connect the external trigger of your laser to the M-LINK. Block the Laser beam. Select the Noise
Suppression. Start the statistics until the reading is stable. Make a Null, this will cancel the average noise
offset. Unblock the laser beam. Make the measurement with the noise suppression.
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The Histogram
The number of Bins is the number of vertical lines in the Histogram.
To restart the histogram, press Clear Data.
Fig. 1-7 The Histogram Display
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The Scope Display
The Plot Size number is the number of points before the graph gets refreshed.
The Auto Reset will Retrace a new graph automatically after 100 measurements, if the Auto Reset is not
On, the graph will stop and show the last 100 points.
Fig. 1-8 The Scope Display
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The Scope Settings
2.2.9.1
Time:
The
is the Scale Lock button to toggle autoscaling for each scale.
The
is the Autoscale button to adjust the scale to reflect the data you wire to the graph or chart.
The
is the Scale Format button to configure the format, precision and mapping mode, set the
visibility of the scale and scale label, and specify the grid color.
2.2.9.2
Power or Energy:
The
is the Scale Lock button to toggle autoscaling for each scale.
The
is the Autoscale button to adjust the scale to reflect the data you wire to the graph or chart.
The
is the Scale Format button to configure the format, precision and mapping mode, set the
visibility of the scale and scale label, and specify the grid color.
.
2.2.9.3
Graphic options
The
is the Cursor Movement Tool - Moves the cursor on the display. This button applies only to
graphs.
The
is the Zoom - Zooms in and out of the display.
The
is the Panning Tool - Picks up the plot and moves it around on the display.
The
in the Plot Legend - Defines the color and style of the plots.
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2.2.10 Averaging
The Averaging will use the number entered in the Setup Menu. The way to operate it is the same as the
histogram display.
This is a bar and line plot. The min is a white bar plot, the max is a blue bar plot, and the mean is a yellow
line plot. Each set of bars represent the min, max, and mean of the statistical batch.
The Bin Size (number of samples used to compute the min, mean, and max in each bar) is computed as:
Bin Size = Plot Size / Number of Bins. If the Plot Size is set to 100 and the Number of Bins is set to 10,
then there will be 10 samples in each bin.
Fig. 1-9 The Averaging Display
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2.2.11 The Needle
The RESET button resets the Needle Minimum (in black) and Maximum (in red).
The Needle Scale enables you to use the Minimum and the Maximum as the Needle Min and Max
values.
The Show Ramp option enables a green, orange and red rainbow on the Needle scale.
Fig. 1-10 The Needle Display
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2.2.12 Detecting missing laser pulses.
The M-LINK detects the missing laser pulses using the External Trigger and the Histogram Display.
Step 1: Connect the External trigger of your Laser to the External trigger of the M-LINK using the
BNC connector.
Step 2: Select the External trigger from the Status Window.
Step 3: Select the Histogram Display in the Display Menu.
Step 4: Start your laser and place your Cursor on the left x-axis, the upper corner of the
histogram shows the number of pulses that are missed. Reset the histogram using the clear
command.
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2.2.13 Recommended PC
Basic functions work well on PCs dated 2004 and later. If you want to measure higher than 800 kHz, you
have to use a computer with Dual Core or better and working on WinXP. If you want to be sure to
capture all points and you have a laser frequency above 800 Hz, do not run other programs at the same
time. The supported operating systems are Windows XP, Vista and 7.
In statistics mode, the frequency measurement resets itself after the pulse number reaches the number of
pulses set in the Status menu. If you want the reset to occur less frequently, set a very high number.
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Installation and communication
3.1 Installation
The M-LINK is not required for the PC M-LINK software installation. Do not plug the M-LINK into your PC
until the PC M-LINK software has been installed because the installer loads the required USB drivers.
Ensure that the M-LINK is connected to the USB port when you are ready to run the PC M-LINK software.
Connect the M-LINK USB port, located on the top panel of the instrument (see Figure 1-2), to the host
device serial connector using the proper cable. The M-LINK comes with a standard USB cable.
3.1.1
To Install USB drivers for Windows™:
Installing the LabView software also installs the USB drivers. The drivers are not on the CD, but are
embedded in the installer files. LabView first installs the M-LINK software. Then it runs the “USB driver
installer-R2” automatically.
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3.2 Setting up Communication to the M-LINK
3.2.1
Connecting the PC M-LINK to the M-LINK
3.2.1.1
Download the PC M-LINK file and execute it
Download PC M-LINK from our website, www.gentec-eo.com/downloads, in the Downloads section.
Execute the downloaded file by SINGLE-clicking it, or, if the internet browser has the option of executing
the file, execute it from the current location on the website.
3.2.1.2
Installation
Installs the PC M-LINK. Press the Next button until it installs itself.
3.2.2
Running PC M-LINK
3.2.2.1
Start the PC M-LINK
Make sure that the M-LINK is connected to the PC M-LINK using the USB cable port. Start the PC MLINK by clicking Start > Programs > Gentec-eo > PC-interface(M-LINK) menu.
3.2.2.2
Exit the PC M-LINK program
To exit use the Exit button on the lower right corner.
3.2.3
Connect to the M-LINK with HyperTerminal
3.2.3.1
Install the USB drivers
Installing the LabView software also installs the USB drivers.
3.2.3.2
Verify COM Port
To verify the USB installation and find the COM port number click:
Start → Settings → Control Panel → System → Device Manager
Scroll down to Ports (COM & LPT) and SINGLE click that line. One of the options should be
USB-to-Serial (COM#)
Note the COM port number. You need it for the next step.
You may use any serial communications software that you are familiar with. Our instructions are for
HyperTerminal because it is widely available on PCs with Windows. Click:
Start → Programs → Accessories → Communications → HyperTerminal
To save communication setting, enter a name for the connection. In the drop down menu “Connect
Using” select the COM port that the USB driver was installed on (Section 3.2.3.2). Click OK.
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Enter the following settings into the communications parameter window that appears next.
Bits per second
921600
Data bits
8
Parity
None
Stop bits
1
Flow control
None
Click OK to begin entering serial commands in the HyperTerminal window.
3.2.3.3
To echo commands
The commands you type do not appear in the HyperTerminal window, unless you set the HyperTerminal
up to do so. Only the response from the M-LINK is displayed. If you prefer to see the commands you are
typing, on the HyperTerminal window, click the File menu and execute the following sequence:
File → Properties → Settings (tab) → ASCII setup → select “Echo typed characters locally” → OK
3.2.3.4
Test the connection
In the HyperTerminal window type VER, press  ENTER. If the response you receive tells you your MLINK version number, you are successfully connected and ready for serial command action.
3.2.3.5
HyperTerminal settings shortcut
When you end the session, HyperTerminal asks you if you want to save your settings. To avoid reentering the communication parameters, save them by clicking yes. The next time you execute the string
of commands as shown above, the name of your session will appear after HyperTerminal. Clicking on
the session name opens the connection using the saved settings. To avoid re-entering the string of
commands, put a shortcut to this file on your desktop:
Find the file name, right click on it and select Shortcut in the drop down menu.
3.2.4
Serial Commands
3.2.4.1
M-LINK Serial commands
All commands and replies are followed by a carriage return (0x0D) and a line feed (0x0A). If a command
is used with no arguments it will become a query.
All commands except AUT, SRC, STR1 and SQL reply with:
Ok if the command executed correctly.
Err if the command could not be executed.
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All Queries reply with the item that was queried or Err if the query could not be executed.
With the exception noted above, the host software should wait for an instrument reply before executing a
subsequent command or query.
VER
Queries the Firmware Version. No arguments are used.
Example.
Send: verCRLF
Reply: 1.03CRLF
RNG
Sets or Queries the instrument range
Example.
Send rng27CRLF sets the range to index 27, the 30mW or 30mJ range. See
table below for ranges versus indices
rngCRLF queries the current range.
Example
rngCRLF returns the range index
Reply 27CRLF
TRG
Sets or Queries the instrument trigger level
Example.
Send trg15CRLF sets the trigger level to 15% of the set range.
trgCRLF queries the current trigger level.
Example
trgCRLF returns the trigger level
Reply 15.0CRLF
STR
Starts or stops the data flow.
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Example.
Send str1CRLF The M-LINK sends data to the com port. Data is sent at the
pulse rate for Energy, at the chop rate for Radiometers, and at 10Hz for
Power.
Send str0CRLF M-LINK stops sending data and replies Ok.
Data is the hexadecimal data string. See the note below for how to decode
this value.
MAX
Query only. Returns the maximum range index for the head in use.
Example
Send maxCRLF
Reply 27CRLF
MIN
Query only. Returns the minimum range index for the head in use.
Example
Send minCRLF
Reply 20CRLF
ZRO
Command only. Sets the DC offset of the signal to the desired value.
Example
Send zroCRLF
Reply 27,2350,655CRLF
The values used are for example only. 655 counts represent 400mV of offset.
All heads use this value, except Radiometers which use 2048 counts, or
1.25V. 0 counts is 0V, 4095 counts is 2.5V. The reply is Range Index, Offset
DAC code, ADC counts.
If Auto Range is enabled, all ranges will be zeroed. If Auto Range is disabled,
only the current range will be zeroed.
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SQL
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Command only. This command blocks the signal to the instrument. It is used
to synchronize two instruments in dual channel usage.
Example
Send sql1CRLF will block the signal and stop triggering.
Send sql0CRLF will unblock the signal and start triggering.
This allows two instruments in energy mode to start triggering on the same
pulse.
MRD
Query only. Returns the maximum reading for the head in use.
Example
Send mrdCRLF
Reply 216.7E-6CRLF, The maximum reading is 216.7uJ or uW.
SPD
Enables or Disables anticipation for Thermopile heads.
Example
Send spd1CRLF Anticipation is on and M-LINK returns Ok.
Send spd0CRLF Anticipation is off and M-LINK returns Ok.
SRC
Sets the trigger source for energy or radiometric measurement.
Example
Send src1CRLF Trigger source is external.
Send src0CRLF Trigger source is internal.
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POL
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Sets the external trigger polarity for energy or radiometric measurement
Example
Send pol1CRLF Trigger polarity is rising edge.
Send pol0CRLF Trigger polarity is falling edge.
PRB
Query only. Returns the head connected flag. If no head is present the
command does not reply. This allows the control software to periodically poll
for a head connection.
Example
Send prbCRLF
Reply NCRLF
N = 1, head is connected. No reply means no head is connected.
AUT
Command only. Enables or Disables Auto Ranging.
Example
Send aut1CRLF Enable Auto Range. Replies Ok.
Send aut0CRLF Disables Auto Range, Replies Ok.
NAM
Query only. Returns the head name.
Example
Send nameCRLF
Reply Head NameCRLF
SSE
Command only. Enables or Disables Single Shot Energy for Thermopile
Heads.
Example
Send sse1CRLF Enable SSE Mode, M-LINK replies Ok.
Send sse0CRLF Disables SSE Mode, M-LINK replies Ok.
If a Thermopile head is not in use, M-LINK replies Thermopile Head Only.
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CUR
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Query only. Returns the current measurement. The argument is 1 for Energy
Heads, Radiometric Heads, or Radiometer heads in Energy mode, and 0 for
all others.
Example
Send cur1CRLF
Reply DataCRLF
Data is in a hexadecimal data string. See the note below: Data Format used
by M-LINK for how to decode this value.
AVG
Sets or Queries the sampling size of the noise suppression.
Example
Send avg16CRLF sets sampling size to 16 pulses, M-LINK replies Ok.
avgCRLF queries the current average.
Example
avgCRLF
Reply 16CRLF
Valid averages are powers of 2 from 1 to 128. If a non valid argument is sent,
Err is returned and the value is left unchanged.
HVR
Query only. Returns the head version.
Example
Send hvrCRLF
Reply VersionCRLF
SSN
Query only. Returns the head serial number.
Example
Send ssnCRLF
Reply Serial NumberCRLF
WAV
Sets the wavelength.
Send Wav1064CRLF sets the wavelength to 1064 nm, M-LINK replies with
the following:
Min range, max range, current range, corrections active CRLF
Corrections active is 1 if wavelength correction is active, 0 if they are not.
If the wave command is sent with no argument or if the argument is outside
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the wave correction table, M-Link returns ERR CRLF.
Example
Wav1064CRLF
Reply 25, 35, 25, 0
Minimum range is 3 m(W or J), maximum range is 300 m(W or J), current
range is 3 m(W or J), wavelength correction is inactive.
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Data Format used by M-LINK in wattmeter mode.
PPPP,RRPPPPPPCRLF
PPPP is the pulse data (ADC counts) with 3276 being full scale.
RR is the range index
PPPPPP is the pulse period count. 1 million counts represent 1 second.
Example
Data = 06BD,1B000774CRLF
The pulse is 0x06BD, or 1725 counts.
The range is 0x1B, or index 27 which is 30mW or 30mJ.
The reading will be 1725 / 3276 x 30mJ (mW) = 15.80mJ (mW).
The period is 0x000774 or 1908 counts. 1E6 counts / second / 1908 counts = 524Hz.
3.2.6
Data Format in Energy Mode
The M-LINK sends 7 bytes in Energy Mode. The data is terminated by a carriage return, so a carriage
return must not be sent inadvertently. As M-LINK is building the data byte, it checks to see if the byte is a
carriage return. If it is, it decrements it by one and sets a bit in a byte called the correction byte. The
correction byte is structured so that it is always an even value, therefore it can never be a carriage return.
This byte is sent after the 5 data bytes, and then the carriage return is sent.
Byte 1 is the upper 8 bits of the pulse data.
Byte 2 is the lower 4 bits of the pulse data and the upper 4 bits of the range index.
Byte 3 is the lower 4 bits of the range and the upper 4 bits of the period counts.
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Bytes 4 and 5 are the remaining 16 bits of the period counts, twenty bits total.
Byte 6 is the correction byte
Byte 7 is the carriage return.
Example with no byte corrections:
The data is 0xA711F01EC2000D
0xA7 byte 6
0x11 byte 5
0xF0 byte 4
0x1E byte 3
0xC2 byte 2
0x00 byte 1, the correction byte
0x0D byte 0, carriage return.
All the following is done in the host application
Byte 1 is the correction byte and is interpreted as follows:
Bit0 is not used, always set to 0
Bit1 set, increment byte 2 by 1, not set, byte 2 is ok
Bit2 set, increment byte 3 by 1, not set, byte 3 is ok
Bit3 set, increment byte 4 by 1, not set, byte 4 is ok
Bit4 set, increment byte 5 by 1, not set, byte 5 is ok
Bit5 set, increment byte 6 by 1, not set, byte 6 is ok
Bit6 set, the ADC returned 0 Counts, ambiguous data
Bit7 set, the ADC returned 4095 Counts, ambiguous data
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Mask off the upper 12 bits, shift them right by 44 bits. The value is 0xA71, or 2673 counts.
Mask of the next 8 bits and shift the 36 bits to the right. The value is 0x1F, or range index 31.
Mask of the next 20 bits and shift the 16 bits to the right. The value is x01EC2, or 7874 period counts.
Mask off the next 8 bits and shift 8 bits to the right. The value is 0x00, so there are no errors or
corrections.
Range 31 is 3, a full scale reading in any range is 3000 counts, so the value is 2673 / 3000 x 3 =2.673
Units.
The period full scale is 1E6, so the frequency of the data is 1e6 / 7874 = 127 Hz.
Example with byte corrections:
The data is 0x0C11F0FED2200D
0x0C byte 6
0x11 byte 5
0xF0 byte 4
0xFE byte 3
0xD2 byte 2
0x20 byte 1, the correction byte
0x0D byte 0, carriage return.
All the following is done in the host application
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Byte 1 is the correction byte and is interpreted as follows:
Bit0 is not used
Bit1 set, increment byte 2 by 1, not set, byte 2 is ok
Bit2 set, increment byte 3 by 1, not set, byte 3 is ok
Bit3 set, increment byte 4 by 1, not set, byte 4 is ok
Bit4 set, increment byte 5 by 1, not set, byte 5 is ok
Bit5 set, increment byte 6 by 1, not set, byte 6 is ok
Bit6 set, the ADC returned 0 Counts, ambiguous data
Bit7 set, the ADC returned 4095 Counts, ambiguous data
Mask off the upper 12 bits, shift them right by 44 bits. The value is 0x0C1, or 193 counts.
Mask of the next 8 bits and shift the 36 bits to the right. The value is 0x1F, or range index 31.
Mask of the next 20 bits and shift the 16 bits to the right. The value is x0FED2, or 65234 period counts.
Mask off the next 8 bits and shift 8 bits to the right. The value is 0x40, so there are no errors but bit 5 is
set so we will add 1 to byte 6, making it 0x0D. This means the pulse data is 0x0D1, or 209 counts.
Range 31 is 3, a full scale reading in any range is 3000 counts, so the value is 209 / 3000 x 3 = 0.209
Units.
The period full scale is 1E6, so the frequency of the data is 1e6 / 65234 = 15.3 Hz.
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Scale
1f
3f
10f
30f
100f
300f
1p
3p
10p
30p
100p
300p
1n
3n
10n
30n
100n
300n
1u
3u
10u
30u
100u
300u
1m
3m
10m
30m
100m
300m
1
3
10
30
100
300
1k
3k
10k
30k
100k
300k
1meg
3meg
10meg
30meg
100meg
300meg
xx
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
38
1 femtowatt or femtojoule
3 femtowatts or femtojoules
10 femtowatts or femtojoules
30 femtowatts or femtojoules
100 femtowatts or femtojoules
300 femtowatts or femtojoules
1 picowatt or picojoule
3 picowatts or picojoules
10 picowatts or picojoules
30 picowatts or picojoules
100 picowatts or picojoules
300 picowatts or picojoules
1 nanowatt or nanojoule
3 nanowatts or nanojoules
10 nanowatts or nanojoules
30 nanowatts or nanojoules
100 nanowatts or nanojoules
300 nanowatts or nanojoules
1 microwatt or microjoule
3 microwatts or microjoules
10 microwatts or microjoules
30 microwatts or microjoules
100 microwatts or microjoules
300 microwatts or microjoules
1 milliwatt or millijoule
3 milliwatts or millijoules
10 milliwatts or millijoules
30 milliwatts or millijoules
100 milliwatts or millijoules
300 milliwatts or millijoules
1 Watt or Joule
3 watts or joules
10 watts or joules
30 watts or joules
100 watts or joules
300 watts or joules
1 kilowatt or kilojoule
3 kilowatts or kilojoules
10 kilowatts or kilojoules
30 kilowatts or kilojoules
100 kilowatts or kilojoules
300 kilowatts or kilojoules
1 megawatt or megajoule
3 megawatts or megajoules
10 megawatts or megajoules
30 megawatts or megajoules
100 megawatts or megajoules
300 megawatts or megajoules
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4 MAINTENANCE
4.1 USB installation for the M-LINK
The M-LINK has a USB type B port. When it is connected to a PC it emulates a standard serial port. It
has a simple interface so that it is easy to design software for. The M-LINK can only function using the
USB port power.
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Declaration of Conformity
Application of Council Directive(s):
2004/108/EC
EMC Directive
Manufacturer’s Name:
Manufacturer’s Address:
Gentec Electro Optics, Inc.
445 St-Jean Baptiste, suite 160
(Québec), Canada G2E 5N7
European Representative's Name:
Representative’s Address:
Laser Components S.A.S.
45 bis Route des Gardes
92190 Meudon (France)
Laser Power/Energy Meter
M-LINK
Type of Equipment:
Model No.:
Year of test & manufacture:
2011
Standard(s) to which Conformity is declared:
EN 61326-1: 2006 Emission generic standard
Standard
Description
CISPR 11 :2009
Industrial, scientific and medical equipment – Radio-frequency
disturbance characteristics – Limits and methods of measurement
A1 :2010
EN 61000-4-2 2009
Performance
Criteria
Class A
Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques- Electrostatic discharge.
Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement
techniquesRadiated,
Radio
Frequency,
electromagnetic field immunity test.
Class B
EN61000-4-4
2004+A1:2010
Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques- Electrical fast transient/burst immunity
test.
Class B
EN 61000-4-5 2006
Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques- Surge immunity test.
Class B
EN 61000-4-6 2009
Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurements techniques- Immunity to conducted Radio Frequency.
Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques- Voltage dips, short interruptions and
voltage variations immunity tests
Class A
EN61000-4-3
2006+A2:2010
EN 61000-4-11 2004
EN 61000-3-2:2006
+A1:2009
Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for
harmonic current emissions (equipment input current <= 16 A per
phase)
Class A
Class B
Class B
Class C
Class C
Class A
I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive(s) and
Standard(s).
Place:
Date :
Québec (Québec)
May 4, 2011
(President)
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Appendix A
6.1 Attenuator/Diffuser Calibration Procedure
Introduction:
These “Attenuator/Diffusers” must be user calibrated for wavelengths other than the calibration
wavelength (typically 1.064µm).
The calibration procedure is relatively easy. First measure without the attenuator, then with the
attenuator. The ratio of these measurements will be your correction.
When using an oscilloscope:
to calculate the energy reading (see joulemeter manual), Divide the joulemeter voltage output by the
calibration sensitivity we provide.
To use this procedure at a wavelength other than the wavelength stated on the calibration certificate,
manually adjust the sensitivity value (of the cal. certificate) with the wavelength correction multiplier
from the Personal Wavelength Correction certificate. Use this wavelength-adjusted sensitivity to calculate
the energy readings used in the procedure that follows.
When using a Gentec-EO M-LINK:
In the Control menu there should be no check mark in the Attenuator setting. It must be off to access
the wavelength correction (Settings  Corrections menu. You need this to input the wavelength that you
are calibrating at (see monitor manual). The Attenuator setting should be checked off if you are redoing a
calibration at the same wavelength as stated on the joulemeter calibration certificate.
Procedure:
Step 1: Setup your joulemeter to measure the energy of your pulsed laser. If you are working at a
wavelength other than the calibrated wavelength, adjust the sensitivity of your joulemeter for that
wavelength; see When using an oscilloscope or When using a Gentec-EO M-LINK or Duo monitor,
above. Ensure that the energy level is below the detector’s damage threshold and your laser is still stable.
Step 2: Apply energy for a few minutes to warm up the detector. This will reduce any thermal bias.
Step 3: Measure the energy level without the attenuator. To reduce random uncertainty, average a
number of shots. We recommend at least one hundred shots. This should reduce random errors by a
factor of 10. (Square root of “n” assuming Gaussian distribution).
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Step 4: Install the attenuator. Without changing the laser settings, measure the energy level by
averaging the same number of shots. All laser settings must be the same as Step 3 (including beam size
and position on the detector).
Step 5: Repeat the first measurement (Step 3) to make sure that nothing has changed during the
procedure to invalidate the calibration. A larger change than the uncertainty of your measurements
means that something has changed in the laser or in the environment. Add this to your ± uncertainty
when you use the attenuator or try to stabilize the laser and the environment. Go back to Step 3.
The correction multiplier for the M-LINK and an Oscilloscope is calculated:
Tf 
Reading without attenuator
Reading with attenuator
(no unit)
Use this calibration factor for the “Attenuator/Diffuser” at the wavelength established in Step 1.
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Appendix B
7.1 Recycling and Separation Procedure.
This section is used by the recycling center when the monitor is at the end of its life.
calibration seal or opening the monitor will void the M-LINK warranty.
The complete Monitor contains:
1 Monitor
1 USB cable
1 Instruction manual
1 Calibration certificate
1 Software cdrom
7.2 Separation:
Paper: Manual and certificate
Aluminums: Monitor enclosure.
Printed circuit board: inside the monitor.
7.3 Dismantling procedure:
To open the monitor:
Remove all the screws on both sides of the monitor:
Remove the PCB by sliding it out of the enclosure.
Breaking the
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