THORLABS MLC8 Series, MLC8050-8, MLC8100-8, MLC8025-8, MLC8200-8 Operation Manual

Artisan Technology Group is your source for quality

new and certied-used/pre-owned equipment

• FAST SHIPPING AND

DELIVERY

• TENS OF THOUSANDS OF
IN-STOCK ITEMS

• EQUIPMENT DEMOS

• HUNDREDS OF
MANUFACTURERS

SUPPORTED

• LEASING/MONTHLY
RENTALS

• ITAR CERTIFIED
SECURE ASSET SOLUTIONS

SERVICE CENTER REPAIRS

Experienced engineers and technicians on staff
at our full-service, in-house repair center

Instra

Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com

Contact us: (888) 88-SOURCE | [email protected] | www.artisantg.com

SM

REMOTE INSPECTION

View

WE BUY USED EQUIPMENT

Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins

www.artisantg.com/WeBuyEquipment

LOOKING FOR MORE INFORMATION?

Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical

specications, manuals, and documentation

Operation Manual

Thorlabs Blueline™ Series

PRO8000 (-4) / PRO800

Multi laser controller module MLC8xxx

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2004

Version: 2.10

Date: 22.01.2004

Copyright© 2004, Thorlabs GmbH

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Contents Page

1 General description of the multi LD-controller MLC8xxx 1

1.1 Safety 1

1.2 Warranty 3

1.3 Features 4

1.3.1 Safety measures for the laser diode 4

1.3.2 General functions 6

1.4 Technical data 7

1.4.1 MLC8025-8 7

1.4.2 MLC8050-8 7

1.4.3 MLC8100-8 8

1.4.4 MLC8200-8 8

1.5 Operating elements at the front of the module 9

1.6 Pre-settings 10

1.6.1 Setting hardware limit I

10

LIM

1.7 Connecting components (Anode Ground Version) 11

1.7.1 Pinning of the output connector 11

1.7.2 Pin assignment MLC8xxx 12

1.7.3 Connecting laser- and monitor diode 17

1.7.4 Standard configurations, no bias voltage 18

1.7.5 Standard configurations with bias voltage 5V 19

1.7.6 Connecting interlock and status display 21

1.8 Connecting components (Cathode Ground Version) 22

1.8.1 Pinning of the output connector 22

1.8.2 Pin assignment MLC8xxx 23

1.8.3 Connecting laser- and monitor diode 28

1.8.4 Standard configurations without bias voltage 29

1.8.5 Standard configurations with bias voltage 5V 31

1.8.6 Connecting interlock and status display 32

2 Operating the MLC8xxx 33

2.1 Functions in the main menu 33

2.1.1 Display 33

2.1.2 Selecting a module 34

2.2 Functions in the channel menu 35

2.2.1 Display 35

2.2.2 Changing parameters 37

2.2.3 Selecting the laser diode current range 38

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2.4 Selecting constant current or constant power mode 38

2.2.5 Selecting a TEC module for temperature protection 40

2.2.6 Activating the temperature protection 40

2.3 Switching on and off 41

2.4 Error messages 42

3 Communicating with a control computer 44

3.1 General notes on remote control 44

3.1.1 Nomenclature 45

3.1.2 Data format 45

3.2 Commands 47

3.2.1 Select the module slot 47

3.2.2 Selecting the channel (PORT) 47

3.2.3 Setting the laser diode current (ILD) 48

3.2.4 Changing the monitor diode current (IMD) 50

3.2.5 Switching the output on and off (LASER) 52

3.2.6 Reading the laser diode hardware limit (LIMCP) 52

3.2.7 Selecting the operation mode (MODE) 53

3.2.8 Setting the current range (RANGE) 53

3.2.9 Activating the temperature protection (TP) 54

3.2.10 Assigning a TEC for temperature protection (TPSLOT) 54

3.2.11 Reading type of module (TYPE) 55

3.3 Error messages of an MLC8xxx 56

3.4 Status reporting. 58

3.4.1 Standard event status register (ESR) 60

3.4.2 Standard event status enable register (ESE) 60

3.4.3 Status byte register (STB) 61

3.4.4 Service request enable register (SRE) 61

3.4.5 Reading the STB by detecting SRQ 62

3.4.6 Reading the STB by "*STB?" command 62

3.4.7 Reading the STB by serial poll 62

3.4.8 Device error condition register (DEC) 63

3.4.9 Device error event register (DEE) 63

3.4.10 Device error event enable register (EDE) 64

4 Service and Maintenance 65

4.1 General remarks 65

4.2 Troubleshooting 66

5 Listings 69

5.1 List of abbreviations 69

5.2 List of figures 71

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.3 Certifications and compliances 72

5.4 Addresses 73

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

We aim to develop and produce the best solution for your application in the

field of optical measurement technique. To help us to come up to your

expectations and develop our products permanently we need your ideas and

suggestions. Therefore, please let us know about possible criticism or ideas.

We and our international partners are looking forward to hearing from you.

In the displays shown by the PRO8 you may find the name PROFILE.

PROFILE was the name of the manufacturer before it was acquired by Thorlabs

and renamed to Thorlabs GmbH.

Thorlabs GmbH

This operation manual contains every specific information on how to operate a multi

laser diode controller module MLC8xxx. A general description is followed by

explanations of how to operate the unit manually. You will also find every information

about remote control via the IEEE 488 computer interface.

Attention

This manual contains “WARNINGS” and “ATTENTION” label in this

form, to indicate dangers for persons or possible damage of equip-

ment.

Please read these advises carefully!

NOTE

This manual also contains “NOTES” and “HINTS” written in this form.

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.1 Safety

1 General description of the multi LD-controller MLC8xxx

1.1 Safety

 Attention 

All statements regarding safety of operation and technical data in

this instruction manual will only apply when the unit is operated

correctly.

Before applying power to your PRO8000 (-4) / PRO800 system, make

sure that the protective conductor of the 3 conductor mains power

cord is correctly connected to the protective earth contact of the

socket outlet!

Improper grounding can cause electric shock with damages to your

health or even death!

Modules may only be installed or removed with the mainframe

switched off.

All modules must be fixed with all screws provided for this purpose.

Modules of the 8000 series must only be operated in the mainframe

PRO8000, PRO8000-4 or PRO800.

All modules must only be operated with duly shielded connection

cables.

Only with written consent from Thorlabs may changes to single

components be carried out or components not supplied by Thorlabs

be used.

This precision device is only dispatchable if duly packed into the

complete original packaging including the plastic form parts. If

necessary, ask for a replacement package.

MLC8xxx / page 1

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.1 Safety

 Attention 

Semiconductor laser modules can deliver up to several 100mW of

(maybe) invisible laser radiation!

When operated incorrectly, this can cause severe damage to your

eyes and health!

Be sure to pay strict attention to the safety recommendations of the

appropriate laser safety class!

This laser safety class is marked on your PRO8000 (-4) / PRO800

plug-in module or on your external laser source used.

 Attention 

Mobile telephones, handy phones or other radio transmitters are not

to be used within the range of three meters of this unit since the

electromagnetic field intensity may then exceed the maximum

allowed disturbance values according to EN 50 082-1.

MLC8xxx / page 2

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.2 Warranty

1.2 Warranty

Thorlabs GmbH warrants material and production of the MLC8xxx modules for a

period of 24 months starting with the date of shipment. During this warranty period

Thorlabs GmbH will see to defaults by repair or by exchange if these are entitled to

warranty.

For warranty repairs or service the unit must be sent back to Thorlabs GmbH

(Germany) or to a place determined by Thorlabs GmbH. The customer will carry the

shipping costs to Thorlabs GmbH, in case of warranty repairs Thorlabs GmbH will

carry the shipping costs back to the customer.

If no warranty repair is applicable the customer also has to carry the costs for back

shipment.

In case of shipment from outside EU duties, taxes etc. which should arise have to be

carried by the customer.

Thorlabs GmbH warrants the hard- and software determined by Thorlabs GmbH for

this unit to operate fault-free provided that they are handled according to our

requirements. However, Thorlabs GmbH does not warrant a faulty free and

uninterrupted operation of the unit, of the soft- or firmware for special applications nor

this instruction manual to be error free. Thorlabs GmbH is not liable for consequential

damages.

Restriction of warranty

The warranty mentioned before does not cover errors and defects being the result of

improper treatment, software or interface not supplied by us, modification, misuse or

operation outside the defined ambient conditions (refer to the PRO8000(-4) /

PRO800 mainframe operation manual) stated by us or unauthorized maintenance.

Further claims will not be consented to and will not be acknowledged. Thorlabs

GmbH does explicitly not warrant the usability or the economical use for certain

cases of application.

Thorlabs GmbH reserves the right to change this instruction manual or the technical

data of the described unit at any time.

MLC8xxx / page 3

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.3 Features

1.3 Features

1.3.1 Safety measures for the laser diode

To protect the connected laser diodes the MLC8xxx modules contain the following

protection circuits:

• Softstart when switching on the laser diode current

Protection against capacitive and inductive parasitic elements (switching peaks).

• Limit for the injection current in all operating modes

Protection against thermal destruction of the laser chip.

• Limit for the optical power in constant current (!) mode

Protection against thermal destruction of the mirrors caused by too high optical

power.

• Interruption control of the connection cable to the laser diode (interlock)

Protection against accidental operation.

• Electronic short-circuit switch for the laser diode

Protection against static discharge when touching the switched off laser.

• Separate on and off function for each module

Protection against operating errors.

• Control LED for activated laser current

Laser protection when laser radiation is switched on.

• Separate over-temperature protection for each module

Protection against thermal failure of the module.

• Mains filter

Protection against line transients.

MLC8xxx / page 4

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.3 Features

• Line failure protection

In case of power failure or line damage the current module must explicitly be

switched on anew since it cannot be taken for granted that all components of the

measurement set-up are still working reliably.

• Key-operated power switch

Protection against unauthorized or accidental use.

• LabVIEW®- and LabWindows/CVI®-driver

For the PRO8000 (-4) / PRO800 Thorlabs supplies LabVIEW®- and LabWin-

dows/CVI®-drivers for MS Windows 32.

Please refer to our homepage for latest driver updates.

http://www.thorlabs.com

MLC8xxx / page 5

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.3 Features

1.3.2 General functions

The current modules MLC8xxx are unipolar current sources for laser diodes.

They can be ordered for laser diodes with anode grounded or cathode grounded. The

MLC offers two current ranges.

The different module types operate the same way, they only differ in maximum

current, resolution and accuracy.

 (Refer to chapter 1.4, "Technical data" starting on page 7)

The current modules MLC8xxx contain a monitor diode input realized as trans-

impedance amplifier (input impedance 0 Ω). Both polarities of the monitor diode are

allowed. The monitor diode may be driven either photovoltaic (without bias voltage)

or photoconductive, i.e. with bias voltage (U

= 5V).

BIA

All necessary value settings are done by the mainframe operating elements (keypad

and rotational encoder) or via remote control by a computer. Only the laser diode

current limit (hardware limit) has to be set manually as "absolute limit".

In an automated test set-up for different laser diodes no manual settings are

required.

All outputs can operate either in constant current or constant power mode

simultaneously. All outputs are switched on and off together.

With the modules MLC8xxx the laser diode current (constant current mode) or the

monitor diode current (constant power mode) are set with 12 bit resolution.

The monitor diode current is read back with 12 bit, the laser diode current, laser

diode voltage and the limit for the laser diode current (hardware limit) with 11 bit plus

sign.

The built-in mains filter in the mainframe and the careful shielding of the transformer,

the micro processor as well as the module itself will provide an excellent suppression

of noise and ripple.

MLC8xxx / page 6

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.4 Technical data

1.4 Technical data

1.4.1 MLC8025-8AG/CG

Selectable range LOW HIGH

Current ranges 5 mA 25 mA

Setting accuracy ± 15 µA ± 75 µA

Setting- / measurement resolution 1.2 µA 6 µA

Noise without ripple (10Hz...10MHz) < 0.5 µA < 0.5 µA

Ripple (50Hz, rms) < 0.5 µA < 0.5 µA

Short term fluctuations (15s) < 0.15 µA < 0.3 µA

Drift (30min, 0...10Hz) < 0.3 µA < 1 µA

Setting range HW-Limit 0 ... ≥ 5 mA 0 ... ≥ 25 mA

Setting accuracy HW-Limit ± 50 µA ± 125 µA

Resolution HW-Limit 1.2 µA 6 µA

1.4.2 MLC8050-8AG/CG

Selectable range LOW HIGH

Current ranges 10 mA 50 mA

Setting accuracy ± 30 µA ± 150 µA

Setting- / measurement resolution 2.5 µA 12 µA

Noise without ripple (10Hz...10MHz) < 0.5 µA < 0.5 µA

Ripple (50Hz, rms) < 0.5 µA < 0.5 µA

Short term fluctuations (15s) < 0.25 µA < 0.5 µA

Drift (30min, 0...10Hz) < 0.5 µA < 1.5 µA

Setting range HW-Limit 0 ... ≥ 10 mA 0 ... ≥ 50 mA

Setting accuracy HW-Limit ± 100 µA ± 250 µA

Resolution HW-Limit 2.5 µA 12 µA

MLC8xxx / page 7

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.4 Technical data

1.4.3 MLC8100-8AG/CG

Selectable range LOW HIGH

Current ranges 25 mA 100 mA

Setting accuracy ± 75 µA ± 300 µA

Setting- / measurement resolution 6 µA 25 µA

Noise without ripple (10Hz...10MHz) < 0.5 µA < 1 µA

Ripple (50Hz, rms) < 0.5 µA < 1 µA

Short term fluctuations (15s) < 0.25 µA < 1 µA

Drift (30min, 0...10Hz) < 1 µA < 3 µA

Setting range HW-Limit 0 ... ≥ 25 mA 0 ... ≥ 100 mA

Setting accuracy HW-Limit ± 0.25 mA ± 0.5 mA

Resolution HW-Limit 6 µA 25 µA

1.4.4 MLC8200-8AG/CG

Selectable range LOW HIGH

Current ranges 50 mA 200 mA

Setting accuracy ± 150 µA ± 600 µA

Setting- / measurement resolution 12 µA 50 µA

Noise without ripple (10Hz...10MHz) < 0.5 µA < 1.5 µA

Ripple (50Hz, rms) < 0.5 µA < 1 µA

Short term fluctuations (15s) < 0.5 µA < 2 µA

Drift (30min, 0...10Hz) < 1.5 µA < 5 µA

Setting range HW-Limit 0 ... ≥ 50 mA 0 ... ≥ 200 mA

Setting accuracy HW-Limit ± 0.5 mA ± 1 mA

Resolution HW-Limit 12 µA 50 µA

MLC8xxx / page 8

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.5 Operating elements at the front of the module

1.5 Operating elements at the front of the module

Connector for the

laser diodes

Potentiometer for I

LIM

Figure 1 Operating elements on front panel.

MLC8xxx / page 9

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.6 Pre-settings

1.6 Pre-settings

1.6.1 Setting hardware limit I

To protect the laser diode the maximum possible current can be limited by hardware

setting.

The setting affects all outputs simultaneously.

The hardware limit I

the module.

 (Refer to chapter 1.5, "Operating elements at the front of the module" on page 9)

The value is displayed continually in the channel menu of the module so you can

watch it during adjustment:

is set with the potentiometer marked I

LIM

LIM

at the front panel of

LIM

CH1 I
CC low I
ON I

1= 1.234mA

LS

1=0.1234mA

PA

1=54.321mA

LIM

CHANGE

Hardware limit I

NOTE

I

1 ... I

LIM

8 show the same value not regarding which one is

LIM

used for setting the hardware limit.

LIM

MLC8xxx / page 10

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7 Connecting components (AG, Anode Ground Version)

1.7.1 Pinning of the output connector

Figure 2 Pinning of the MLC8xxx output connector

(44-pole female HD-SUB)

MLC8xxx / page 11

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.2 Pin assignment MLC8xxx

Each laser is connected to an output channel as shown:

output circuit of the MLC Laser and photo diode

(n = 1 ... 8)

Figure 3 Principle connections for every laser

We recommend to use separate lines drilled in pairs (twisted pair) in a common

shield for laser diode current and monitor diode current respectively.

The shield must be connected to ground!.

MLC8xxx / page 12

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.2.1 Pin assignment sorted by Function

Pin Connector

14 LD1C cathode of laser # 1
12 LD2C cathode of laser # 2
11 LD3C cathode of laser # 3
9 LD4C cathode of laser # 4
8 LD5C cathode of laser # 5
6 LD6C cathode of laser # 6
5 LD7C cathode of laser # 7
3 LD8C cathode of laser # 8

29 LD1A anode of laser # 1
27 LD2A anode of laser # 2
26 LD3A anode of laser # 3
24 LD4A anode of laser # 4
23 LD5A anode of laser # 5
21 LD6A anode of laser # 6
20 LD7A anode of laser # 7
18 LD8A anode of laser # 8

13 PD1A anode photo diode # 1
42 PD2A anode photo diode # 2
10 PD3A anode photo diode # 3
39 PD4A anode photo diode # 4
7 PD5A anode photo diode # 5
36 PD6A anode photo diode # 6
4 PD7A anode photo diode # 7
33 PD8A anode photo diode # 8

43 PD1C cathode photo diode # 1
41 PD2C cathode photo diode # 2
40 PD3C cathode photo diode # 3
38 PD4C cathode photo diode # 4
37 PD5C cathode photo diode # 5
35 PD6C cathode photo diode # 6
34 PD7C cathode photo diode # 7
32 PD8C cathode photo diode # 8

31 GND ground
16 GND ground
17 GND ground
19 GND ground
22 GND ground
25 GND ground
28 GND ground

MLC8xxx / page 13

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

30 GND ground

44 LEDA out for a LED to show the on/off status
15 Interlock to be shortened to any GND pin

1 + 5V
2 - 5V

MLC8xxx / page 14

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.2.2 Pin assignment sorted by pin number

Pin Connector

1 + 5V
2 - 5V
3 LD8C cathode of laser # 8
4 PD7A anode photo diode # 7
5 LD7C cathode of laser # 7
6 LD6C cathode of laser # 6
7 PD5A anode photo diode # 5
8 LD5C cathode of laser # 5
9 LD4C cathode of laser # 4

10 PD3A anode photo diode # 3
11 LD3C cathode of laser # 3
12 LD2C cathode of laser # 2
13 PD1A anode photo diode # 1
14 LD1C cathode of laser # 1
15 Interlock to be shortened to any GND pin
16 GND ground
17 GND ground
18 LD8A anode of laser # 8
19 GND ground

20 LD7A anode of laser # 7
21 LD6A anode of laser # 6
22 GND ground
23 LD5A anode of laser # 5
24 LD4A anode of laser # 4
25 GND ground
26 LD3A anode of laser # 3
27 LD2A anode of laser # 2
28 GND ground
29 LD1A anode of laser # 1

30 GND ground
31 GND ground
32 PD8C cathode photo diode # 8
33 PD8A anode photo diode # 8
34 PD7C cathode photo diode # 7
35 PD6C cathode photo diode # 6
36 PD6A anode photo diode # 6
37 PD5C cathode photo diode # 5
38 PD4C cathode photo diode # 4
39 PD4A anode photo diode # 4

MLC8xxx / page 15

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

40 PD3C cathode photo diode # 3
41 PD2C cathode photo diode # 2
42 PD2A anode photo diode # 2
43 PD1C cathode photo diode # 1
44 LEDA out for a LED to show the on/off status

MLC8xxx / page 16

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.3 Connecting laser- and monitor diode

Laser diodes are produced in many different housings. Normally the following

components are installed together in the chassis of the laser:

• Laser diode

• Monitor diode

• TEC element for setting the chip temperature

• Temperature sensor

The laser diode is always sourced against ground by the current controller. This is of

considerable advantage regarding the safety of the laser diode and the stability of the

laser diode current.

The monitor diode input is set up as trans-impedance amplifier with virtual ground

(input impedance 0Ω).

The polarity of the photo diode may be selected free. It can also be floating.

The monitor diode input can be used with or without bias voltage (5 V or 0 V).

Therefore wire bridges have to be connected depending on the individual

configuration shown in the next section.

MLC8xxx / page 17

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.4 Standard configurations, no bias voltage

1.7.4.1 Laser anode on ground / photo diode cathode on ground

n = number of channel (1 to 8)

Figure 4 Laser AG / photo diode CG, no bias

1.7.4.2 Laser anode on ground / photo diode anode on ground

n = number of channel (1 to 8)

Figure 5 Laser AG / photo diode AG, no bias

MLC8xxx / page 18

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.4.3 Laser anode on ground / photo diode floating

n = number of channel (1 to 8)

Figure 6 Laser AG / photo diode floating, no bias

a bridge (dashed line) may be used either at the laser or at the connector

1.7.5 Standard configurations with bias voltage 5V

1.7.5.1 Laser anode on ground / photo diode cathode on ground

n = number of channel (1 to 8)

Figure 7 Laser AG / photo diode CG, 5V bias

MLC8xxx / page 19

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.5.2 Laser anode on ground / photo diode anode on ground

n = number of channel (1 to 8)

Figure 8 Laser AG / photo diode AG, 5V bias

1.7.5.3 Laser anode on ground / photo diode floating

n = number of channel (1 to 8)

Figure 9 Laser AG / photo diode floating, 5V bias

 Attention 

Reverse connection of the photo diode using a bias voltage can

cause permanent damage to the device.

MLC8xxx / page 20

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.7 Connecting components (AG, Anode Ground Version)

1.7.6 Connecting interlock and status display

Interlock, cable damage monitoring

Pin 15 connected to any GND pin of the connector jack will serve as test connector to

determine whether the current output for the laser diode may be switched on.

Between the two pins a low resistive (< 430Ω) connection must be maintained. Also

short-circuiting is permitted. With the contacts open the multi laser controller module

cannot be switched on.

Should the contact open during operation the output will be switched off immediately.

Status display

It is also possible to use a LED with anode to pin 44 and cathode to any GND pin as

status display.

The LED will light up if the current output is switched on.

MLC8xxx / page 21

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8 Connecting components (CG, Cathode Ground Version)

1.8.1 Pinning of the output connector

Figure 10 Pinning of the MLC8xxx output connector

(44-pole female HD-SUB-D)

MLC8xxx / page 22

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.2 Pin assignment MLC8xxx

Each laser is connected to an output channel as shown:

output circuit of the MLC Laser and photo diode

(n = 1 ... 8)

Figure 11 Principle connections for every laser

We recommend to use separate lines drilled in pairs (twisted pair) in a common

shield for laser diode current and monitor diode current respectively.

The shield must be connected to ground.

MLC8xxx / page 23

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.2.1 Pin assignment sorted by Function

Pin Connector

14 LD1A anode of laser # 1
12 LD2A anode of laser # 2
11 LD3A anode of laser # 3
9 LD4A anode of laser # 4
8 LD5A anode of laser # 5
6 LD6A anode of laser # 6
5 LD7A anode of laser # 7
3 LD8A anode of laser # 8

29 LD1C cathode of laser # 1
27 LD2C cathode of laser # 2
26 LD3C cathode of laser # 3
24 LD4C cathode of laser # 4
23 LD5C cathode of laser # 5
21 LD6C cathode of laser # 6
20 LD7C cathode of laser # 7
18 LD8C cathode of laser # 8

13 PD1A anode of the photo diode of laser # 1
42 PD2A anode of the photo diode of laser # 2
10 PD3A anode of the photo diode of laser # 3
39 PD4A anode of the photo diode of laser # 4
7 PD5A anode of the photo diode of laser # 5
36 PD6A anode of the photo diode of laser # 6
4 PD7A anode of the photo diode of laser # 7
33 PD8A anode of the photo diode of laser # 8

43 PD1C cathode of the photo diode of laser # 1
41 PD2C cathode of the photo diode of laser # 2
40 PD3C cathode of the photo diode of laser # 3
38 PD4C cathode of the photo diode of laser # 4
37 PD5C cathode of the photo diode of laser # 5
35 PD6C cathode of the photo diode of laser # 6
34 PD7C cathode of the photo diode of laser # 7
32 PD8C cathode of the photo diode of laser # 8

31 GND ground
16 GND ground
17 GND ground
19 GND ground
22 GND ground
25 GND ground
28 GND ground

MLC8xxx / page 24

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

30 GND ground

44 LEDA out for a LED to show the on/off status
15 Interlock to be shortened to any GND pin

1 + 5V
2 - 5V

MLC8xxx / page 25

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.2.2 Pin assignment sorted by number of pin

Pin Connector

1 + 5V
2 - 5V
3 LD8A anode laser # 8
4 PD7A anode photo diode # 7
5 LD7A anode laser # 7
6 LD6A anode laser # 6
7 PD5A anode photo diode # 5
8 LD5A anode laser # 5
9 LD4A anode laser # 4

10 PD3A anode photo diode # 3
11 LD3A anode laser # 3
12 LD2A anode laser # 2
13 PD1A anode photo diode # 1
14 LD1A anode of laser # 1
15 Interlock to be shortened to any GND pin
16 GND ground
17 GND ground
18 LD8C cathode laser # 8
19 GND ground

20 LD7C cathode laser # 7
21 LD6C cathode laser # 6
22 GND ground
23 LD5C cathode laser # 5
24 LD4C cathode laser # 4
25 GND ground
26 LD3C cathode laser # 3
27 LD2C cathode laser # 2
28 GND ground
29 LD1C cathode laser # 1

30 GND ground
31 GND ground
32 PD8C cathode photo diode # 8
33 PD8A anode photo diode # 8
34 PD7C cathode photo diode # 7
35 PD6C cathode photo diode # 6
36 PD6A anode photo diode # 6
37 PD5C cathode photo diode # 5
38 PD4C cathode photo diode # 4
39 PD4A anode photo diode # 4

MLC8xxx / page 26

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

40 PD3C cathode photo diode # 3
41 PD2C cathode photo diode # 2
42 PD2A anode photo diode # 2
43 PD1C cathode photo diode # 1
44 LEDA out for a LED to show the on/off status

MLC8xxx / page 27

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.3 Connecting laser- and monitor diode

Laser diodes are produced in many different housings. Normally the following

components are installed together in the chassis of the laser:

• Laser diode

• Monitor diode

• TEC element for setting the chip temperature

• Temperature sensor

The laser diode is always sourced against ground by the current controller. This is of

considerable advantage regarding the safety of the laser diode and the stability of the

laser diode current.

The monitor diode input is set up as trans-impedance amplifier with virtual ground

(input impedance 0 Ω).

The polarity of the photo diode may be selected free. It can also be floating.

The monitor diode input can be used with or without bias voltage (5 V or 0 V).

Therefore wire bridges have to be connected depending on the individual

configuration shown in the next section.

MLC8xxx / page 28

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.4 Standard configurations without bias voltage

1.8.4.1 Laser cathode on ground / photo diode cathode on ground

n = number of channel (1 to 8)

Figure 12 Laser CG / photo diode CG, no bias

1.8.4.2 Laser cathode on ground / photo diode anode on ground

n = number of channel (1 to 8)

Figure 13 Laser CG / photo diode AG, no bias

MLC8xxx / page 29

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.4.3 Laser cathode on ground / photo diode floating

n = number of channel (1 to 8)

Figure 14 Laser CG / photo diode floating, no bias

a connection (dashed line) may be done either at the laser or at the connector

MLC8xxx / page 30

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.5 Standard configurations with bias voltage 5V

1.8.5.1 Laser cathode on ground / photo diode cathode on ground

n = number of channel (1 to 8)

Figure 15 Laser CG / photo diode CG, with 5 V bias

1.8.5.2 Laser cathode on ground / photo diode anode on ground

n = number of channel (1 to 8)

Figure 16 Laser CG / photo diode AG

MLC8xxx / page 31

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

1.8 Connecting components (CG, Cathode Ground Version)

1.8.5.3 Laser cathode on ground / photo diode floating

n = number of channel (1 to 8)

Figure 17 Laser CG / photo diode floating, 5 V bias

 Attention 

Reverse connection of the photo diode can cause permanent damage

to the device when using a bias voltage!

1.8.6 Connecting interlock and status display

Interlock, cable damage monitoring

Pin 15 connected to any GND pin of the connector jack will serve as test connector to

determine whether the current output for the laser diode may be switched on.

Between the two pins a low resistance (<430 Ω) must be maintained. Also short-

circuiting is permitted. With the contacts open the multi laser controller module

cannot be switched on.

Should the contact open during operation the output is switched off immediately.

Status display

It is also possible to use a LED with anode to pin 44 and cathode to any GND pin as

status monitor.

The LED will light up if the current output is switched on.

MLC8xxx / page 32

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.1 Functions in the main menu

2 Operating the MLC8xxx

 Before switching on the laser current please refer to chapter 1.6, "Pre-settings"

starting on page 10

NOTE

With modules of the MLC8xxx series all settings are executed at once. It is

not necessary to confirm the set values.

2.1 Functions in the main menu

2.1.1 Display

The main menu shows the channel number, mode, range and status of the MLC8xxx

module.

channel no. Cursor mode range status

CH1 Iconst low off
CH2 Iconst low off
CH3 Iconst low off
TUNE

MLC8xxx / page 33

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.1 Functions in the main menu

2.1.2 Selecting a module

Select a module for further input by setting the cursor to the channel number of the

desired module using the softkeys and .

CH2

Pressing will lead to the channel menu

 (Refer to chapter 2.2, "Functions in the channel menu" starting on page 35)

MLC8xxx / page 34

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

2.2 Functions in the channel menu

The channel menu is opened from the main menu by pressing the key .

Hit again or

to return to the main menu.

2.2.1 Display

In the channel menu all parameters of the selected module are shown:

channel no. cursor operating parameters

CH3 RANGE = LOW
CC low MODE = Iconst

OFF Twin OFF

CHANGE

status field operating mode

Only three parameters can be shown at a time, so there is a scroll function. All

parameters are sorted in a virtual list, which can be run through with the cursor:

RANGE = LOW

MODE = Iconst

Twin OFF

Twin slot= -

I

1=19.000mA

LS

I

1=0.0022mA

PA

I

1=59.000mA

LIM

.

.

.

I

8=19.000mA

LS

I

8=0.0022mA

PA

I

8=59.000mA

LIM

MLC8xxx / page 35

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

The status field shows the actual status:

Normal operation

ON Laser is on
OFF Laser is off

Malfunction

Vcc  Internal power supply failed – maintenance required
OTP  Final stage overheated – switch off and wait 10 minutes
ILCK Interlock is open
ILIM Limit current reached during operation

In the channel menu you find some abbreviations which are explained as follows

In constant current mode:

ILS 1 ... ILS 8 Laser diode set current of channel 1... 8

IPA 1 ... IPA 1 Photo diode actual current of channel 1 ... 8

In constant power mode:

IPS 1 ... IPS 8 Photo diode set current of channel 1 ... 8

ILA 1 ... ILA 8 Laser diode actual current of channel 1 ... 8

In both modes

I

LIM

1 ... I

8 Limit current (is the same for chanell 1 ... 8)

LIM

MLC8xxx / page 36

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

2.2.2 Changing parameters

To set or change a numerical parameter in the channel menu select the respective

line with the cursor:

Example: change ILS 1:

CH1 I
CC low I
OFF I

1=21.234mA

LS

1=0.0019mA

PA

1=49.000mA

LIM

CHANGE

Pressing the key (CHANGE), will activate the tuning knob to change the selected

parameter. If the parameter is only to toggle (e.g. the polarity of the laser diode) the

function of the softkeys will change:

TOGGLE:const CUR/POW

Pressing the right softkey toggles the mode.

Pressing

Some parameters can not be changed, as they are measurement values

(i.e. the laser voltage) or may not be changed with the laser switched on.

MLC8xxx / page 37

will terminate the procedure.

NOTE

In these cases access is denied indicated by a long beep.

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

2.2.3 Selecting the laser diode current range

If the range of the laser diode current shall be changed, the parameter

RANGE =

has to be selected in the channel menu.

The right softkey will toggle between “high” and “low” range.

2.2.4 Selecting constant current or constant power mode

The multi laser controller modules MLC8xxx offer two operating modes for the laser

diodes: constant current and constant power mode.

In constant current mode the laser diode current will be kept constant. If the

temperature of the laser changes the optical power will change too, since the laser

efficiency will change.

In the channel menu you can select the mode Iconst.

If the set-up uses a monitor diode receiving a certain part of the laser light the

measured monitor diode current can be kept constant by adjusting the laser diode

current correspondingly. Changes in temperature of the laser will cause a change of

its efficiency but the laser diode current is re-set for the optical power to remain

constant. This is called constant power mode, Pconst

.

NOTE

For "constant power" mode a separate monitor diode will be necessary for

each laser in the set-up.

MLC8xxx / page 38

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

So if the operating mode of the laser diodes shall be changed, the parameter

MODE =

can be set to:

Iconst = Constant current mode

Pconst = Constant power mode

 (Refer to chapter 2.2.2, "Changing parameters" on page 37)

MLC8xxx / page 39

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.2 Functions in the channel menu

2.2.5 Selecting a TEC module for temperature protection

If the laser diodes should be operated only in a specific temperature range (window)

you can use the temperature window function of a TED 8xxx module.

 (Refer to manual of the TED8xxx)

The TED8xxx must be assigned to the MLC8xxx as described here. Two steps are

necessary:

First the parameter

Twin slot =

must be set to the slot number of the desired TED8xxx.

(If only one TED8xxx is inserted, the slot number is recognized automatically)

2.2.6 Activating the temperature protection

Second the temperature protection must be switched ON:

Twin ON

If the temperature protection shall not be active it has to be switched off again:

Twin OFF

MLC8xxx / page 40

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.3 Switching on and off

2.3 Switching on and off

 Attention 

MLC8xxx modules can be switched on or off not regarding if any

parameters have been set.

Please select the module to be switched on or off in the main menu.

 (Refer to chapter 2.1.2, "Selecting a module" on page 34)

 Attention 

Before switching on a multi laser diode controller module MLC8xxx

first set the laser diode current limit I

applied laser diodes with a screwdriver.

The corresponding potentiometer is marked I

front panel of the current module.

(Refer to chapter 1.6.1, "Setting hardware limit I

Pressing the key

as long as the module is selected (LED “SEL” lights). The LED “ON” at the respective

module will light up.

will switch on the module not regarding the menu you are in

(hardware limit) for the

LIM

and is situated at the

LIM

” on page 10

LIM

MLC8xxx / page 41

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.4 Error messages

2.4 Error messages

Error messages are shown in the bottom line of the display not regarding, if you are

in the main menu or channel menu.

If an error occurs with the module switched on the display shows for example:

CH1 I
CC low I
OFF I

1=21.234mA

LS

1=0.0019mA

PA

1=49.000mA

LIM

<CH3 interlock> ok

Channel causing the error Error message ok to accept

Possible error messages for an MLC8xxx module are:

INTERLOCK Interlock line is open or has opened
ctrl Temp Laser temperature left temperature window
OTP Module is overheated. Operation is possible after cooling

down.

Vcc fail Internal supply voltage fails - module needs maintenance.
Not if LD on Certain parameters are not allowed to be changed while

laser is ON.

TWIN Laser temperature left temperature window.

If the error occurs during operation it is written in brackets:

<CH1 INTERLOCK>

MLC8xxx / page 42

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

2.4 Error messages

If the error occurs by trying to switch on it is written in cursor arrows:

CH1 interlock

If an error occurs, it has to be acknowledged by pressing "ok" . Until acknowl-

edgement further operation is locked.

MLC8xxx / page 43

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.1 General notes on remote control

3 Communicating with a control computer

3.1 General notes on remote control

The description of the mainframe of the PRO8000 (-4) / PRO800 includes all

instructions of how to prepare and execute the programming of the system via a

computer interface.

Special operation features of the MLC8xxx module are described here.

 (Refer to chapter 2, "Operating the MLC8xxx" starting on page 33)

NOTE

All analog values are read and written in SI units, i.e. A (not mA), W (not

mW) etc. Letters may be written in small or capital letters.

 Attention 

Before programming a multi laser diode controller module first set

the limit value of the laser diode current I

applied laser diodes with a screwdriver.

The corresponding potentiometer is marked I

front panel of the MLC8xxx module.

The value I

and can be checked in the channel -menu of the MLC8xxx during

is constantly measured by the PRO8000 (-4) / PRO800

LIM

(hardware limit) for the

LIM

and is situated at the

LIM

setting.

 (Refer to chapter 1.6.1, "Setting hardware limit I

MLC8xxx / page 44

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

" on page10)

LIM

3.1 General notes on remote control

3.1.1 Nomenclature

Program messages (PC ⇒ PRO8000) are written in inverted commas: "*IDN?"

Response messages (PRO8000 ⇒ PC) are written in brackets: [:SLOT 1]

There is a decimal point: 1.234

Parameters are separated with comma: "PLOT 2,0"

Commands are separated with semicolon: "*IDN?;*STB?"

3.1.2 Data format

According to the IEEE 488.2 specifications all data variables are divided into 4

different data formats:

Character response data (<CRD>)

Is a single character or a string. Examples:

A or ABGRS or A125TG or A1.23456A

 (Refer to IEE488.2 (8.7.1))

Numeric response data Type 1 (<NR1>)

Is a numerical value with sign in integer notation. Examples:

1 or +1 or -22 or 14356789432

 (Refer to IEE488.2 (8.7.2))

MLC8xxx / page 45

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.1 General notes on remote control

Numeric response data Type 2 (<NR2>)

Is a numerical value with or without sign in floating point notation without exponent.

Examples:

1.1 or +1.1 or -22.1 or 14356.789432

 (Refer to IEE488.2 (8.7.3))

Numeric response data Type 3 (<NR3>)

Is a numerical value with or without sign in floating point notation with exponent with

sign . Examples:

1.1E+1 or +1.1E-1 or -22.1E+1 or 143.56789432E+306

(Refer to IEE488.2 (8.7.4))

MLC8xxx / page 46

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2 Commands

3.2.1 Select the module slot

":SLOT <NR1>" Selects a slot for further programming

<Nr1>=1…8 (PRO8000(-4)), 1…2 (PRO800)

":SLOT?" Queries the selected slot

[:SLOT <NR1><LF>]

3.2.2 Selecting the channel (PORT)

Programming:

":PORT 1" Select port 1 for further commands
":PORT 2" Select port 2 for further commands

Reading:

":PORT?" Read the selected port
[:PORT <NR1><LF>]

MLC8xxx / page 47

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.3 Setting the laser diode current (ILD)

NOTE

These commands affect the laser diode current of the laser of one specific

channel. Please select first this channel (port) with the command

"PORT <NR1>".

Programming:

":ILD:SET <NR3>" Program the laser diode set current
":ILD:START <NR3>" Program the laser diode start current for

“ELCH1”

":ILD:STOP <NR3>" Program the laser diode stop current for

“ELCH”

":ILD:MEAS <NR1>" Program the laser diode current as

measurement value on position <NR1> in the

output string for “ELCH” (<NR1> = 1....8)

Reading:

":ILD:SET?" Read the laser diode set current
[:ILD:SET <NR3><LF>]
":ILD:ACT?" Read the actual laser diode current
[:ILD:ACT <NR3><LF>]
":ILD:MIN?" Read the minimum laser diode current

allowed

[:ILD:MIN <NR3><LF>]
":ILD:MAX?" Read the maximum laser diode current

allowed

[:ILD:MAX <NR3><LF>]

1

“ELCH”: ELectrical CHaracterization

MLC8xxx / page 48

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

":ILD:MIN_W?" Read the minimum laser diode current for

Ild –DAC = 0000
[:ILD:MIN_W <NR3><LF>]

":ILD:MAX_W?" Read the maximum laser diode current for

Ild –DAC = FFFF
[:ILD:MAX_W <NR3><LF>]

":ILD:MIN_R?" Read the minimum laser diode current for

I ld –ADC = 0000
[:ILD:MIN_R <NR3><LF>]

":ILD:MAX_R?" Read the maximum laser diode current for

Ild –ADC = FFFF
[:ILD:MAX_R <NR3><LF>"]

":ILD:START?"

[:ILD:START <NR3><LF>]

Read the laser diode start current for “ELCH”

":ILD:STOP?" Read the laser diode stop current for “ELCH”
[:ILD:STOP <NR3><LF>]
":ILD:MEAS?" Read the position of the laser diode current

as measurement value in the output string for

“ELCH” (1....8, 0 if not selected)

[:ILD:MEAS <NR1><LF>]

MLC8xxx / page 49

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.4 Changing the monitor diode current (IMD)

NOTE

This commands affects the monitor diode current of the laser of one

specific channel. Please first select this channel (port) with the command

"PORT <NR1>".

 (Refer to Chapter 3.2.2, "Selecting the channel (PORT)" on page 47)

Programming:

":IMD:SET <NR3>" Program the monitor diode set current
":IMD:START <NR3>" Program the monitor diode start current for

“ELCH”

":IMD:STOP <NR3>" Program the monitor diode stop current for

“ELCH”

":IMD:MEAS <NR1>" Program the monitor diode current to be

measurement value in the “ELCH” output

string on position <NR1> (1....8)

Reading:

":IMD:SET?" Read the monitor diode set current
[:IMD:SET <NR3><LF>]
":IMD:ACT?" Read the actual monitor diode current
[:IMD:ACT <NR3><LF>]
":IMD:MIN?" Read minimum monitor diode set current

allowed

[:IMD:MIN <NR3><LF>]

MLC8xxx / page 50

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

":IMD:MAX?" Read maximum monitor diode set current

allowed

[:IMD:MAX <NR3><LF>]
":IMD:MIN_W?" Read minimum monitor diode current for

Ipd – DAC = 0000
[:IMD:MIN_W <NR3><LF>]

":IMD:MAX_W?" Read maximum monitor diode current for

Ipd – DAC = FFFF
[:IMD:MAX_W <NR3><LF>]

":IMD:MIN_R?" Read minimum monitor diode current for

Ipd –ADC = 0000
[:IMD:MIN_R <NR3><LF>]

":IMD:MAX_R?" Read maximum monitor diode current for

Ipd –ADC = FFFF
[:IMD:MAX_R <NR3><LF>]

":IMD:START?"

Read the monitor diode start current for

“ELCH”

[:IMD:START <NR3><LF>]
":IMD:STOP?" Read the monitor diode stop current for

“ELCH”

[:IMD:STOP <NR3><LF>]
":IMD:MEAS?" Read the position of the monitor diode

current as measurement value in the “ELCH”

output string (1....8, 0 if not selected)

[:IMD:MEAS <NR1><LF>]

MLC8xxx / page 51

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.5 Switching the output on and off (LASER)

Programming:

":LASER ON" Turn the laser output on
":LASER OFF" Turn the laser output off

Reading:

":LASER?" Read status of the laser output
[:LASER ON<LF>]

[:LASER OFF<LF>]

3.2.6 Reading the laser diode hardware limit (LIMCP)

Reading:

":LIMCP:ACT?" Read the actual hardware-limit
[:LIMCP:ACT <NR3><LF>]
":LIMCP:MIN_R?" Read Imax – ADC = 0000
[:LIMCP:MIN_R <NR3><LF>]
":LIMCP:MAX_R?" Read Imax – ADC = FFFF
[:LIMCP:MAX_R <NR3><LF>]

MLC8xxx / page 52

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.7 Selecting the operation mode (MODE)

Programming:

":MODE CC" Constant current mode
":MODE CP" Constant power mode

Reading:

":MODE?" Read the mode of operation
[:MODE CC<LF>]

[:MODE CP<LF>]

3.2.8 Setting the current range (RANGE)

Programming:

":RANGE <NR1>" Setting the current range 0 (low current) or 1

(high current)

Reading:

":RANGE?" Read the current range

[:RANGE <NR1><LF>]

MLC8xxx / page 53

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.9 Activating the temperature protection (TP)

Programming:

":TP ON" Switch temperature protection on
":TP OFF" Switch temperature protection off

Reading:

":TP?" Read status of the temperature protection
[:TP ON<LF>]

[:TP OFF<LF>]

3.2.10 Assigning a TEC for temperature protection (TPSLOT)

Programming:

":TPSLOT <NR1>" Program assigned slot number (1...8 for

PRO8000(-4), 1...2 for PRO800)

Reading:

":TPSLOT?" Read assigned slot number
[:TPSLOT <NR1><LF>]

MLC8xxx / page 54

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.2 Commands

3.2.11 Reading type of module (TYPE)

Reading:

":TYPE:ID? " Read the module ID (here 47)

[:TYPE:ID 47<LF>]

":TYPE:SUB? " Read module subtype:

0: Anode ground version
[:TYPE:SUB 0<LF>]

1: Cathode ground version
[:TYPE:SUB 1<LF>]

MLC8xxx / page 55

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.3 Error messages of an MLC8xxx

3.3 Error messages of an MLC8xxx

[1601, "Interlock is open"]

Possible reason: Try to switch on the output while the Interlock line is open.

 (Refer to chapter 1.7.6, "Connecting interlock and status display" on page 21)

[1603, "Over temperature"]

Possible reason: Try to switch on the output while the internal temperature is too

high. Wait until the module has cooled down. Maintain proper air

flow.

[1604, "Internal power failure"]

Possible reason: Try to switch on the output while an internal power failure

occurred.

[1607, "No setting of ILD during constant power mode"]

Possible reason: The set value of the laser diode current can not be changed in

constant power mode.

[1608, "No setting of IMD during constant current
mode"]

Possible reason: The set value of the monitor diode current cannot be changed in

constant current mode.

[1616, "No mode change during laser on"]

Possible reason: The operating mode CC or CP cannot be changed with the laser

diode output switched on.

MLC8xxx / page 56

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.3 Error messages of an MLC8xxx

[1619, "No changing of current range during laser on"]

Possible reason: The current range cannot be changed with the laser diode output

switched on.

[1620, "Attempt to switch on laser while temperature is

out of window"]

Possible reason: The actual temperature of the laser diode is outside the

temperature window.

[1621, "Attempt to activate Twin although there is no

TEC in the system"]

Possible reason: The temperature window protection can only be activated, if a

TEC module is present in the PRO8000(-4) / PRO800.

[1622, "Attempt to activate Twin during laser on"]

Possible reason: The temperature window protection can only be activated, if the

laser diode output is switched off.

[1623, "No TEC in this slot"]

Possible reason: There is no TEC in the assigned slot.

MLC8xxx / page 57

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4 Status reporting.

The MLC8xxxx modules provide three 16 bit registers DEC, DEE and EDE (see

Figure 18) and four 8 bit registers ESR, STB, ESE and SRE (see Figure 19) to

program various service request functions and status reporting.

Power limit

Power Supply Error

Temperature out
of window (with TEC)

Current limit

Interlock Open

Open Circuit (LD)

Over Temperature

(:STAT:DECn?)

n: Slot number

 (Please refer to the IEEE488.2-1992 standard chapter 11)

Figure 18 The MLC8xxx device error registers DEC, DEE and EDE

MLC8xxx / page 58

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

Service

Request

Generation

Output buffer

{

{

{

ERROR Queue

{

{

or serial poll

{

Figure 19 The PRO8000 (-4) / PRO800 register ESR, ESE, STB and SRE

MLC8xxx / page 59

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4.1 Standard event status register (ESR)

The bits of this register represent the following standard events:

Power on This event bit indicates, that an off to on transition has

occurred in the power supply. So it is high after turning on

the device for the first time.

User request (Not used)

Command error A command error occurred.

Execution error An execution error occurred.

Device dependent error A device dependent error occurred.

Query error A query error occurred.

Request control (Not used)

Operation complete Can be set with "*OPC".

The ESR can be read directly with the command "*ESR?". This read command

clears the ESR. The content of the ESR can not be set.

The bits are active high.

3.4.2 Standard event status enable register (ESE)

The bits of the ESE are used to select, which bits of the ESR shall influence bit 5

(ESB) of the STB. The 8 bits of the ESE are combined with the according 8 bits of

the ESR via a wired “AND”-function. These 8 results are combined with a logical

“OR”-function, so that any "hit" leads to a logical 1 in bit 5 (ESB) of the STB. As any

bit of the STB can assert an SRQ, every event (bit of the ESR) can be used to assert

an SRQ.

MLC8xxx / page 60

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4.3 Status byte register (STB)

The bits of this register are showing the status of the PRO8000 (-4) / PRO800.

RQS RQS: Request service message: Shows, that this device

has asserted SRQ (read via serial poll).

MSS Master summary status: Shows that this device requests a

service (read via "*STB?").

MAV (Message AVailable) This bit is high after a query request,

as a result "waits" in the output queue to be fetched. It is

low, if the output queue is empty.

DES (Device Error Status) This bit is high after a device error

occurred. Which device errors will set this bit is defined

with the EDE.

EAV (Error AVailable) This bit is high as long as there are

errors in the error queue.

FIN (command FINished) This bit is high, after a command has

finished and all bits of the STB have been set.

The STB can be read directly with the command "*STB?". The content of the STB

can not be set. The bits are active high.

All bits except bit 6 of the STB can be used to assert a service request (SRQ)

 (Please refer to 3.4.5). Alternatively the SRQ can be recognized using the command
 "*STB?" (Please refer to 3.4.6) or by serial poll (Please refer to 3.4.7).

3.4.4 Service request enable register (SRE)

The bits of the SRE are used to select, which bits of the STB shall assert an SRQ.

Bit 0, 1, 2, 3, 4, 5 and 7 of the STB are related to the according 7 bits of the SRE by

logical “AND”. These 7 results are combined by a logical "OR", so that any "hit" leads

to a logical 1 in bit 6 of the STB and asserts an SRQ.

MLC8xxx / page 61

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4.5 Reading the STB by detecting SRQ

If an SRQ is asserted (see 3.4.4) bit 6 of the STB is set to logical 1, so that the

controller can detect which device asserted the SRQ by auto serial polling.

3.4.6 Reading the STB by "*STB?" command

If the controller does not "listen" to SRQ’s at all, the service request can be detected
by reading the status byte with the command "*STB?".

If bit 6 is logical 1, a service request was asserted.

3.4.7 Reading the STB by serial poll

If the controller does not support auto serial poll, the service request can also be

detected via manual serial poll.

If bit 6 is logical 1, a service request was asserted.

MLC8xxx / page 62

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4.8 Device error condition register (DEC)

The bits of this register show the errors, that occur during operation (operation

errors). The bits are active high.

If the error disappears, the bits are reset to low.

For MLC8xxx laser diode controller modules bits 0 ... 4, 8 and 11 are used:

(0) Over temperature Laser temperature too high. Wait until the module has

cooled down. Maintain proper air flow.

(1) Open circuit Laser diode circuit is open.

(2) Interlock open The interlock has opened or path resistance is >430 Ω.

(3) Current limit The current limit is reached and the protection circuit is

active now. Noise and drift specs are not valid any more.

(4) Temperature out of window Appropriate laser temperature (controlled by

an TEC-module) is out of specified window.

(8) Power supply error Internal power supply error.

(11) Power limit The given hard- or software power limit is reached.

The DEC can be read but not set. Reading does not clear the DEC.

3.4.9 Device error event register (DEE)

The bits of this register hold the errors, that occurred during operation (operation

errors). So each bit of the DEC sets the according bit of the DEE.

The DEE can be read but not set. Reading clears the DEE.

MLC8xxx / page 63

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

3.4 Status reporting.

3.4.10 Device error event enable register (EDE)

The bits of the EDE are used to select, which bits of the DEE shall influence bit 3

(DES) of the STB. The 8 bits of the EDE are related by logical "AND" to the according

8 bits of the DEE. This 8 results are connected by logical "OR", so that any "hit" leads

to a logical 1 in bit 3 (DES) of the STB. As any bit of the STB can assert an SRQ,

every error (bit of the DEE) can be used to assert an SRQ.

MLC8xxx / page 64

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

4.1 General remarks

4 Service and Maintenance

4.1 General remarks

You should regularly control the correct function of the interlock.

With the laser in operation, disrupt the interlock connection: the laser output must go

into “OFF” state immediately.

Besides the above mentioned point the MLC8xxx modules do not need any

further maintenance by the user.

If highest precision of measurements is vital to you, you should have recalibrated the

MLC8xxx module about every two years.

MLC8xxx / page 65

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

4.2 Troubleshooting

4.2 Troubleshooting

In case that one module of your PRO8000 (-4) / PRO800 system shows malfunction

please check the following items:

 Module does not work at all (no display on the mainframe):

 Mainframe PRO8000 (-4) / PRO800 connected properly to the mains?

 Connect the PRO8000 (-4) / PRO800 to the power line, take care of the

right voltage setting of your mainframe.

 Mainframe PRO8000 (-4) / PRO800 turned on?

 Turn on your PRO8000 (-4) / PRO800 with the key mains-switch.

 Control the fuse at the rear panel of the PRO8000 (-4) / PRO800 mainframe.

 If blown up, replace the fuse by the correct type

 (refer to your PRO8000 (-4) / PRO800 mainframe operating manual to select

the appropriate fuse)

 The PRO8000 (-4) / PRO800 display works, but not the module:

 Is the module inserted correctly and are all mounting screws tightened?

 Insert the module in the desired slot and tighten all

mounting screws

properly.

MLC8xxx / page 66

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

4.2 Troubleshooting

 You don’t get the desired laser output power

 Is the interlock closed?

 Control the resistance between the interlock pins of the connector jack not

to be more than 430 Ω.

(refer to section 1.7.6, “ Connecting interlock and status display” on page

21)

 Do you have selected the desired module?

 (The LED “SEL” on the front panel of the module must be on)

Select the desired module on the display by means of the up- and down

arrow keys.

 Do you have selected the desired port?

 Select the desired port for input on the display by means of the up- and

down arrow keys or by the ":PORT <NR1>" command.

 Do you have turned on the laser output in the main menu or one of the sub-

menus?

 Change the status setting from “off” to “on”.

 The LED “ON” on the front panel of the module must be on

 Is the hardware limit I

 Adjust the hardware limit I

set to 0?

LIM

by means of the potentiometer on the

LIM

MLC8xxx front panel

 Is the laser current I

of the corresponding port set to 0?

PS

 Adjust the laser current in the channel menu to the desired value.

 Is the laser diode installed properly?

 Control the connection cable.

MLC8xxx / page 67

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

4.2 Troubleshooting

 Is the laser diode poled correctly?

 If not, change the polarity of the laser diode corresponding to the type of

MLC-module used (AG or CG)

 Is the photo diode connected properly?

 Check the connecting cable.

 Do you use a temperature window with inappropriate setting or with no TEC

connected?
 Change settings, install TEC or turn off the window function

If you don’t find the error source by means of the trouble shooting list or if more

modules work erratic please first connect the Thorlabs-Hotline

([email protected]) before sending the whole PRO8000 (-4) / 800 system for

checkup and repair to Thorlabs-Germany.

(refer to section 5.4, “Addresses ” on page 73

MLC8xxx / page 68

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.1 List of abbreviations

5 Listings

5.1 List of abbreviations

The following abbreviations are used in this manual:

AC Alternating Current

ADC A

nalog to Digital Converter

AG Anode Ground

CG Cathode Ground

CLR CLeaR

CR Carriage Return

CRD C

haracter Response Data

DAC Digital to Analog Converter

DC Direct Current

DCL Device Clear

DEC Device Error Condition Register

DEE Device Error Event Register

DES Device Error Status

EAV Error AVailable

EDE Enable Device Error Event Register

EDFA E

rbium Doped Fiber Amplifier

ELCH ELectrical Characterization

EOI End Of Information

ESE Standard Event Status Enable register

ESR Event Status Register

FIN Command FIN

ished

GET Group Execute Trigger

GTL Go To Local

IEEE Institute for Electrical and Electronic Engineering

LD Laser Diode

LDC L

LED L

aser Diode Controller

ight Emitting Diode

LF Line Feed

LLO Local Lockout

LS Laser Source Module

NR1 Numeric Response data of type 1

MLC8xxx / page 69

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.1 List of abbreviations

NR2 Numeric Response data of type 2

NR3 Numeric Response data of type 3

MAV Message AVailable)

MSS Master Summary Status

OTP Over TemPerature

PC Personal Computer

PD Photo Diode

RQS ReQuest Service Message

SDC Selected Device Clear

SEL SELect

SRE Service Request Enable Register

SRQ Service ReQuest

STB STatus Byte Register

SW Soft Ware

TEC ThermoElectric Cooler (Peltier Element)

TRG TRiGger

MLC8xxx / page 70

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.2 List of figures

5.2 List of figures

Figure 1 Operating elements on front panel. 9

Figure 2 Pinning of the MLC8xxx output connector 11

Figure 3 Principle connections for every laser 12

Figure 4 Laser AG / photo diode CG, no bias 18

Figure 5 Laser AG / photo diode AG, no bias 18

Figure 6 Laser AG / photo diode floating, no bias 19

Figure 7 Laser AG / photo diode CG, 5V bias 19

Figure 8 Laser AG / photo diode AG, 5V bias 20

Figure 9 Laser AG / photo diode floating, 5V bias 20

Figure 10 Pinning of the MLC8xxx output connector 22

Figure 11 Principle connections for every laser 23

Figure 12 Laser CG / photo diode CG, no bias 29

Figure 13 Laser CG / photo diode AG, no bias 29

Figure 14 Laser CG / photo diode floating, no bias 30

Figure 15 Laser CG / photo diode CG, with 5V bias 31

Figure 16 Laser CG / photo diode AG 31

Figure 17 Laser CG / photo diode floating, 5V bias 32

Figure 18 The MLC8xxx device error registers DEC, DEE and EDE 58

Figure 19 The PRO8000 (-4) / PRO800 register ESR, ESE, STB and SRE 59

MLC8xxx / page 71

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.3 Certifications and compliances

5.3 Certifications and compliances

Certifications and compliances

Category Standards or description

EC Declaration of
Conformity - EMC

EN 61326 EMC requirements for Class A electrical equipment for

IEC 61000-4-2 Electrostatic Discharge Immunity (Performance criterion C)
IEC 61000-4-3 Radiated RF Electromagnetic Field Immunity (Performance

IEC 61000-4-4 Electrical Fast Transient / Burst Immunity (Performance

IEC 61000-4-5 Power Line Surge Immunity (Performance criterion C)
IEC 61000-4-6 Conducted RF Immunity (Performance criterion B)
IEC 61000-4-11 Voltage Dips and Interruptions Immunity (Performance

EN 61000-3-2 AC Power Line Harmonic Emissions

Australia /
New Zealand
Declaration of
Conformity - EMC

FCC EMC
Compliance

1

Compliance demonstrated using high-quality shielded interface cables, including with a custom-made shielded cable

installed at the LD OUT port.

2

Compliance demonstrated with the MLC8x series modules installed in the Thorlabs PRO8x series of mainframes.

3

Emissions, which exceed the levels required by these standards, may occur when this equipment is connected to a test

object.

4

Minimum Immunity Test requirement.

Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was
demonstrated to the following specifications as listed in the Official Journal of the European
Communities:

measurement, control and laboratory use, including Class A
Radiated and Conducted Emissions

1,2,3

and Immunity.

1,2,4

criterion B)

criterion C)

criterion C)

Complies with the Radiocommunications Act and demonstrated per EMC Emission standard

1,2,3

:

AS/NZS 2064 Industrial, Scientific, and Medical Equipment:

1992

Emissions comply with the Class A Limits of FCC Code of Federal Regulations 47, Part 15, Subpart

1,2,3

B

.

MLC8xxx / page 72

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

5.4 Addresses

5.4 Addresses

Thorlabs GmbH

Gauss-Strasse 11

D-85757 Karlsfeld

Fed. Rep. of Germany

Tel.: [phone] / 5956-0

Fax: [phone] / 5956 99

Email: [email protected]

Internet: http://www.thorlabs.com

Technical Hotline: [email protected]

Our company is also represented by several distributors and sales offices throughout

the world.

Please call our hotline, send an E-mail to ask for your nearest distributor or just visit

our homepage http://www.thorlabs.com

MLC8xxx / page 73

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Artisan Technology Group is your source for quality

new and certied-used/pre-owned equipment

• FAST SHIPPING AND

DELIVERY

• TENS OF THOUSANDS OF
IN-STOCK ITEMS

• EQUIPMENT DEMOS

• HUNDREDS OF
MANUFACTURERS

SUPPORTED

• LEASING/MONTHLY
RENTALS

• ITAR CERTIFIED
SECURE ASSET SOLUTIONS

SERVICE CENTER REPAIRS

Experienced engineers and technicians on staff
at our full-service, in-house repair center

Instra

Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com

Contact us: (888) 88-SOURCE | [email protected] | www.artisantg.com

SM

REMOTE INSPECTION

View

WE BUY USED EQUIPMENT

Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins

www.artisantg.com/WeBuyEquipment

LOOKING FOR MORE INFORMATION?

Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical

specications, manuals, and documentation