Page 2 · 4200-DR Series LaserSource User’s Manual

Table of Contents
Introduction ............................................................................................... 3
Safety Terms and Symbols ....................................................................... 4
Quick Start ................................................................................................ 6
Installation ................................................................................................. 7
Operation .................................................................................................. 9
Settings and Menus ................................................................................ 11
Saving and Restoring Configurations ..................................................... 15
Laser Control Modes ............................................................................... 16
Power and Cable Connections ............................................................... 17
Connecting to the 4200-DR..................................................................... 18
Remote Mode Operation ......................................................................... 19
Installing the USB Drivers ....................................................................... 19
Grounding Considerations ...................................................................... 20
Analog Modulation .................................................................................. 20
Using Limits ............................................................................................. 21
Compensating for Voltage Loss.............................................................. 22
Field Calibration (User Cal) ..................................................................... 25
Specifications .......................................................................................... 29
Error Messages ....................................................................................... 30
Maintenance and Service........................................................................ 32
EC Declaration of Conformity ................................................................. 34
UK Declaration of Conformity ................................................................. 35

4200-DR Series LaserSource User’s Manual · Page 3

Introduction
Thank you for choosing the 4200-DR Series LaserSource from Arroyo
Instruments. The 4200-DR upgrades our popular 4200 Series with new featuresand improved performance, all coming from a company with years of experiencein the field of current control for laser applications.
With a large, crystal clear VFD display, USB computer interface, and small
footprint, the 4200-DR will fit into almost any laser diode control application.
The 4200-DR includes complete optical isolation of both modulation andphotodiode inputs. By isolating these inputs, it prevents unwanted ground loop
problems. No other laser diode driver in the industry has this feature. The 4200DR also operates in constant voltage control mode, allowing you to use it inprecision voltage applications, such as EML devices, or for doing V-I
measurement graphs.
Unlike other controllers in its class, which use inexpensive 7-segment displays,
the 4200-DR takes advantage of its large VFD display to simultaneously show
the set points and measurements.
The user interface of the 4200-DR is engineered to make using the instrument
straightforward. With its text-based menus, there is never any confusion overwhich setting is being changed, and parameters are displayed in clear English(no cryptic numbers or LEDs to decode).
The 4200-DR offers all the features you would expect from a modern precisionlaser driver, including:
•
•
•
•
•
•

10ppm current stability
100mA to 2A current ranges
Comprehensive laser protection circuitry, including hardware voltage
and current limits, and fast transient shutdown.
External analog modulation
Power mode control, both in photodiode current (AMC) or computed
photodiode power (APC) modes.
Simultaneous display of set points and readings

What’s in the Box
Along with the 4200-DR itself, a CD with electronic copies of this manual, theComputer Interfacing Manual, and USB drivers are included. For USA
customers, a power cord is included. For non-USA customers, an IEC-60320C13 rated AC power cord must be provided.

Page 4 · 4200-DR Series LaserSource User’s Manual

Accessories
Arroyo Instruments also sells several accessories designed to work with the4200-DR. These include:•••

1220B LaserSource Cable, 4A, 2m
This cable has DB-9 male/female connectors for interfacing to theLaserMount or other connectorized fixtures, and shielded twisted pairconductors for improved modulation performance. A pigtailed versionof this cable, with tinned ends for soldering into custom solutions, isavailable as p/n 1221B.
2U Rack Mount Kit, 2 Bay (p/n 1400-RM)
For installing your 4200 Series LaserSource or 5200 Series
TECSource into a standard 19” rack. The rack mount kit has space for
two instruments, but if you plan to only install a single instrument, alsoorder a 1 Bay Blank (p/n 1400-BL) to fill the unused opening.
1201 USB Cable

Safety Terms and Symbols
The following safety-related terms are used in this manual:•••Warnings (noted by the WARNING heading) explain dangers that
could result in physical injury or death;
Cautions (noted by the CAUTION heading) explain conditions that
could result in damage to the instrument, other equipment, or yourdevice.
Notes (noted by the NOTES heading) are not safety-related, and areintended simply to point out important information.

If, at any time, any of the following conditions exist, or are suspected of existing,discontinue use of the unit until it can be inspected by qualified service
personnel:•••

Visible damage to the unit, including damage or stress caused during
product shipment;
Storage of the unit outside the standard storage temperature or
humidity rating, or prolonged storage under harsh conditions;
Failure to operate properly.

If needed, contact your distributor or Arroyo Instruments for service or repair toensure the safety of the product is maintained.

4200-DR Series LaserSource User’s Manual · Page 5

Symbols
Power OffPower On

Caution, refer to manual

Earth ground

Caution, risk of electric shock
General Warnings

WARNING
Potentially lethal voltages exist within this instrument.
This instrument is intended for use by qualified
personnel who understand the shock and laser hazards
and are familiar with safety procedures required to avoid
injury. Read this manual completely before attempting
to use this product.

WARNINGTo avoid electrical shock, ensure a 3-prong power cord
is used, and is plugged into a earth-grounded
receptacle. Failure to do so can result in severe injury or
death.

CAUTION

There are no user-serviceable parts inside. All service
and repair work shall be done by Arroyo Instruments or
personnel authorized by Arroyo Instruments.
Modifications done by non-authorized personnel willvoid the warranty. Please see the Service section laterin this manual for instructions on how to obtain service
for this instrument.

Page 6 · 4200-DR Series LaserSource User’s Manual

Quick Start
The 4200-DR was designed with ease of use in mind, and you will likely havelittle need for this manual for almost all of the features the unit offers. Thissection will show how you can quickly get the unit up and running in almost notime.
After unpacking the unit, ensure that the voltage selection on the Input Power
Connector (IPC) on the back of the unit is set to the correct voltage. This is
critical, as incorrect voltages can damage the unit. The 4200-DR is typicallyshipped in the 120V configuration from the factory, but always verify the voltage
selection. Change the voltage as needed. For more information, refer to the IPC
section below.
Once the voltage selection has been completed, plug the AC cord into the unit
and into the wall outlet. Turn on the power switch located on the back panel,and the unit will power up, displaying the model information, serial number, andfirmware version number.
Press the Menu button to enter the menu, and using the knob, turn to the right
until the Io Lim setting is displayed. Press the knob to edit the setting, andadjust the limit as appropriate to your laser diode. Press the knob again to savethe value. Make the same adjustments to the voltage limit (Vf Lim), asappropriate for your application. Once you have made all your adjustments,press the Menu button to exit the menu.
Next, connect the cables between your LaserMount or other fixture and the
OUTPUT connector of the 4200-DR. We recommend using our cables as they
have been designed to work well with the 4200-DR. If using your own cables,
ensure they have been properly wired according to the pin-out of the 4200-DR
and your fixture.
Finally, change the set points to an appropriate current and press the Output
button to turn the output on. When turning on the laser for the first time, it is agood idea to start with a set point of zero and ramp up to the desired set point.
In this way, if the laser is wired incorrectly, the safety circuits will trip earlier andminimize any chance of damaging the laser. Once you have confirmed proper
operation, the set point can be left at the desired operating point, and simply use
the Output button to turn the laser on and off.
For more detailed operating and installation instructions, read on.

4200-DR Series LaserSource User’s Manual · Page 7

Installation
Installation of the 4200-DR is very straightforward, as the quick start section
above illustrated. This section will provide additional details and considerations
for installing your 4200-DR.
After unpacking the unit, make sure all packing materials have been removed
and nothing obscures the ventilation ports on the side and bottom of the unit.
Changing the Voltage Selection
Before powering on the unit, ensure that the voltage selection on the IPC is set
correctly. Improper voltage selection can easily damage the unit. Changing thevoltage selection requires that you remove the voltage selection module fromthe IPC. You can select from 100V, 120V, and 230V. Choose the voltage thatmost closely matches your AC voltage.
Remove the power cord from the unit. Using a small, flat-blade screwdriver,
insert the tip of the screwdriver into the two small openings above and below thevoltage indication to release the voltage selection module from the IPC, as
shown in the picture below.

Input Power Connector (IPC)
Once the module has been removed, remove the small, white voltage selection
tumbler from the module, and then re-insert so that the desired voltage isshown. Re-insert the module into the IPC.

Page 8 · 4200-DR Series LaserSource User’s Manual

CAUTION
Do not exceed 250VAC on the line input.
It is critical to select the proper voltage selection prior toapplying power to the unit. If the actual voltage exceeds
the voltage selection by +/-10%, damage to the unit
may occur.

Powering Up the Unit
Once the correct voltage selection has been made, connect the AC power cord
to the unit. You must properly ground the unit by plugging the supplied power
cord into a three prong grounded outlet, or using a three-to-two prong adapter
and connecting the ground tab to earth ground.
Turn the power switch, located on the back panel, into the on (|) position. The
unit will display the model, serial number, and firmware version, go through aquick power-up self-test, and return to the last known operating state.
Ventilation
The 4200-DR has vent holes on both sides of the unit. You must not block thesevent holes, or overheating may occur, causing damage to the unit.

CAUTION
Do not operate the unit above +40°C ambient, andensure the instrument is properly ventilated, or the unit
may overheat and possible damage to the unit may
occur.
Rack Mounting
A rack mount kit (p/n 1400-RM) for standard 19” racks is available for the 4200DR, and supports rack mounting of one or two units in a 2U (3.5”) high opening.
The rack mount kit provides sufficient clearance below the units for ventilation,
so units can be rack mounted immediately above other equipment (no rack
spacers required). Because the unit draws air from the sides of the unit, andtherefore inside the rack housing, be sure that the internal rack ambient
temperature (which will typically be several degrees higher than room ambient)does not exceed the unit’s operating temperature. If only racking one
instrument, you will also need a bay blank (p/n 1400-BL) to cover the second
opening in the rack mount kit.

4200-DR Series LaserSource User’s Manual · Page 9

Warm-up and Environmental Considerations
In order to achieve the highest level of accuracy, the 4200-DR should bepowered on for at least one hour prior to taking measurements. In addition,
ensure that the unit is not operating outside the ambient temperature range orhumidity conditions.

Operation
The Front Panel
Operation of the 4200-DR is very straightforward. The sections below will help
familiarize you with the front panel, the display, and the menu structure.

The front panel is designed for ease of operation. There is an Output button forthe laser output, and one to enter the menu.
The output is controlled via the Output button. When turning the output on,
there is a programmable delay (factory default of 3 seconds) where the unit will
indicate that the output is on (the blue output LED will be lit), but the output
stage is in fact not on. This is a CDRH safety feature required for some laser
applications. The output will be energized once the delay has expired.
The Menu button is used to enter the 4200-DR menu. When in remote mode, it
acts as a Local button, returning the instrument to local mode.
The large adjustment knob located on the right hand side of the unit is used tochange the set point or parameters in the menu. It also acts as a push button,
primarily as an enter button, when making changes in the menu.
There are four LEDs: a green power LED that is lit whenever the AC power isturned on; the blue Output on LED that indicates the 4200-DR is actively
controlling the laser diode; a red Error LED that indicates an error has occurred;
and a yellow Remote LED that indicates the unit is being controlled via a
computer.

Page 10 · 4200-DR Series LaserSource User’s Manual

Whenever an error is generated, the red Error LED will light, and the error will be
displayed on the VFD display. There may be one or more errors, but only the
first error will be displayed. To display the next error, press Menu button. To
clear all errors, press the knob. A list of error codes can be found in the Error
Messages section below.
When the unit is in remote mode, the yellow Remote LED will be lit. Moreinformation about how the instrument behaves in remote mode can be found in
the Remote Mode Operation section below.
Main Display Screen
On the main display you will find the set point and two measurements. Which set
point and measurements are displayed will depend on the control mode you
have selected. An example display is shown below:

Sample Display

Measurements
One of the advantages of the 4200-DR is its ability to display both the set point
and two measurements simultaneously. The table below shows which values willappear on the display depending on the mode selected:
Mode
Io
Im
Po
Vf

Setpoint
Current (mA)
PD current (μA)
PD power (mW)
Voltage (V)Displayed Measurements
PD current or power and voltage
Current and voltage
Current and voltage
Current and PD current or power

The instrument will show photodiode current or photodiode power, dependingon the value of PD Resp. Photodiode current is shown whenever PD Resp iszero, while photodiode power will be shown whenever PD Resp is non-zero.
See the Control Modes section below for more information on the various
modes.
You can control the resolution of the Io set point and measurement by adjusting
the Io Res setting in the menu. This gives you the flexibility of adjusting theresolution to the needs of the application. For example, if you are adjusting
between 50mA and 80mA, you may not need the 0.005mA resolution the 4201-

4200-DR Series LaserSource User’s Manual · Page 11

DR can provide. By changing to 1mA resolution, adjustments are easier andquicker to make. The accuracy of the instrument remains the same, regardlessof the resolution, so 85mA set point 1mA resolution is the same as 85.000mA set
point at 0.005mA resolution.
Status Messages
The instrument will display status messages in the upper-right corner of thedisplay indicating several different conditions that may be of interest to the user.
If multiple conditions exist simultaneously, then the instrument will cycle througheach condition, displaying each status message for approximately one second.
Possible condition messages are:
LoBW
HiBW
Script
Lock
Shrt
OutT
ILim
MLim
PLim

The unit is in Io (LoBW) mode.
The unit is in Io (HiBW) mode.
The unit is executing a script or remote command.
The interlock is open and the unit cannot be turned on.
A short circuit has been detected on the output.
The unit is out-of-tolerance. See the Tol Time and Tol Io settings formore information.
The unit is in current limit.
The unit is in photodiode current limit.
The unit is in photodiode power limit.

Notice that HiBW mode indicator is in reverse text, and is used to highlight theoperating mode.

Settings and Menus
All parameters of the 4200-DR can be viewed and changed within the menu.
The menus are constructed with the most used parameters first. To change any
setting, press Menu to enter the menu then rotate the knob to select theparameter to change. Press the knob to begin changing the value. As a visualindication that you are in edit mode, you will see an asterisk appear next to thevalue. Once you have made your change, press the knob or Menu button to
store the value. Pressing the Menu button will store and exit the menu, whilepressing the knob will store the value but leave you in the menu to makeadditional changes.
Some settings are contained inside a sub menu, such as communications
settings. To access the sub menu, simply press the knob to enter the sub menu
when its name is displayed.

Page 12 · 4200-DR Series LaserSource User’s Manual

Menu

Description

Root Menu

Top Level Menu

Factory
Default

Mode

As described in the Control Modes section above,
the unit offers five control modes: Io (ACC), Io
HiBW (ACC), Im (AMC), Po (APC), and Vf (AVC).
Change this setting to select a new mode.

Range

Selects the high or low current range.

Io ResResolution of the Io set point and measurement.
Available options are dependent on the range ofthe instrument.

Depends
on modelIo Limit

This setting controls the maximum amount offorward current that can be delivered to the laser
diode. This limit is implemented in hardware forhigh speed response. For more information about
limits, see Hardware and Software Limits below.

Maximum

Im Limit

This setting controls the maximum amount ofmonitor photodiode current the unit will allow. This
limit is implemented in software. For more
information about limits, see Hardware andSoftware Limits below.

Maximum

Po Limit

This setting controls the maximum amount ofmonitor photodiode power the unit will allow. This
limit is implemented in software. For more
information about limits, see Hardware andSoftware Limits below.

Maximum

Vf Limit

This setting controls the maximum amount offorward current that can be delivered to the laser
diode. This limit is implemented in hardware forhigh speed response. For more information about
limits, see Hardware and Software Limits below.

Maximum

Vf Sense

Selects the remote voltage sense lines for diodevoltage measurement. The remote voltage sense
pins must be wired to the diode. See Using
Remote Voltage Sense below for more details.

Local

Vf Sense
Warn

When operating in remote voltage sense mode, if
the remote voltage is significantly lower that thevoltage at the Laser Output connector, a warning
message is displayed. The setting disabled thewarning. Only available when Vf Sense is set toRemote.

Yes

Io (ACC)High

4200-DR Series LaserSource User’s Manual · Page 13
Description

Factory
Default

Cable R

The cable resistance, in ohms. This setting can beused to compensate for voltage losses in the cabledue to cable and connector resistances. Cable R
is ignored in Vf (AVC) Mode. For more information
about this feature, see Using the Cable R Setting
below. Not available when using remote voltage
sense.

0.0000 Ω

Int Contact

Enables or disables intermittent contact.

PD RespThis factor is used by the unit to convert frommonitor photodiode current into optical power. The
value is in terms of microamps per milliwatt(μA/mW), such that power = photodiode current
divided by the factor.

PD BiasThis is the photodiode bias voltage, which isapplied to the PD+/PD- pins of the output
connector.

Tol Time

Tolerance time is the amount of time, in seconds,
that the measured value (current, voltage, etc.)
must be within the set point +/- the tolerance forthe unit to be considered in tolerance. In Io modes,
the tolerance is defined by Tol Io. For Im/Po
modes, the tolerance is fixed at 50uA. For Vfmode, the tolerance is fixed at 50mV.

5 seconds

Tol IoTolerance current is a band (in mA) around the set
point. When the actual current is within this bandfor longer than the Tol Time setting, then the unit isconsidered to be in tolerance.

10.0mAOn Delay

The delay, from the time the Output button ispressed to when the output is actually energized.

3000msMenu

Comm Menu

Off
0.00μA/mW

5.0V

Communications Menu

Set While
Rmt

To disable changing the set point while in Remote
Mode, set this value to “No”. To enable changing
the set point while in Remote mode, set this Valueto “Yes”.

No

Err While
Rmt

To turn off the display of errors while in remotemode, set this value to “No”. To display errors
while in remote mode, set this value to “Yes”.

Yes

Terminal
Mode

Terminal mode simply echoes any characters
received over the USB interface.

No

Msg Term

This controls the output message termination, andcan be set to CR/LF, CR, LF, or None.

CR/LF

Page 14 · 4200-DR Series LaserSource User’s Manual

Menu

Description

Sys Menu

System Settings Menu

Factory
Default

ConfigAllows for restoring the instrument to defaults,
saving configurations, and restoring
configurations. See Saving and Restoring
Configurations below for more information.

Display

Display mode, which is used to control the layout
on the main screen. Normal will display threevalues, typically the set point current, photodiodeor power read back and voltage. Large will display
the read back current, depending on the mode (Io,Im, Po, VF mode, respectively). When changing
the set point, the set point will be displayed during
the set point change.

NormalBrightness

The vacuum florescent display can be set to one ofeight brightness levels.

100%

AudibleBeep

This setting controls when the unit produces
audible feedback. Set to No to prevent sound, or
Yes to enable audible alerts such an error
messages.

Yes

Lockout
Knob

Lockout knob allows you to disable knob
operation from the main display. This preventsaccidental changes of the set point. The knob will
always work in the menus regardless of thissetting.

No

Knob Speed

Controls the adjustment speed of the knob.
Possible values are slow, medium, and fast.

Slow

Advanced

No Change

Advanced Settings Menu

Off if Io Lim

Turns off the laser output if the Io limit is activeNo

Off if Im Lim

Turns off the laser output if the Im limit is exceededYes

Off if Po Lim

Turns off the laser output if the Po limit isexceededYes

Off if OutTol

Turns off the laser output if the laser goes out of
tolerance

No

User Cal
Edit Cal

User Calibration Menu (located in Advanced Menu)
Set to “Yes” to enable editing of any of the user
calibration entriesNo4200-DR Series LaserSource User’s Manual · Page 15
Description

Menu

Factory
Default

Reset Cal

Reset the TEC user calibration data to factory
defaults (all slopes to 1, all offsets to 0). Requires
Edit Cal to be set to Yes before this setting will be
displayed.

No

Various
M&B
Settings

Slope (M) and Offset (B) user calibration settingsfor each set point and measurement. See the User
Cal - Field Calibration section below for additional
details on using slope/offset calibration.

No

Saving and Restoring Configurations
Using the Main Menu » System Menu » Config menu item, or the *SAV and*RCL commands over the computer interfaces, 4200-DR allows you to save up
to four configurations. Each configuration will store all of the instrument settings(except scripts and the function key definitions), and allow you to quickly recall
them. This is particularly useful when the instrument is used in multiple setups,
and the particular configuration of each setup can be stored and later recalled
for a quick reconfiguration.
To store a configuration, simply change the Config menu item to select which
configuration slot you want to store the current configuration into. The
instrument will generate a message indicating the save was successful (or not).
You can also use the *SAV command over the computer interface to do this aswell.
To recall a configuration, change the Config menu item to recall theconfiguration you would like to use. You can also use the *RCL command overthe computer interface to do this as well.
A special option for the Config menu item is Defaults, and as the name implies,
it will restore the unit to factory default configuration, however, scripts andconfigurations are not erased, and user calibration data is not cleared. To erase
user calibration data, you must use the Reset Cal menu item found in the Laser
User Cal menus, or manually adjust each user calibration entry to 1 (for slope) or
0 (for offset). See Field Calibration, below, for more details.

Page 16 · 4200-DR Series LaserSource User’s Manual

Laser Control Modes
The 4200-DR offers up to five laser control modes: Io (ACC), Io HiBW (ACC),
Im (AMC), Po (APC), and Vf (AVC).
Changing the control mode is done through the menu by changing the Modeparameter in the menu to one of these values.
Io and Io HiBW modes (referred to collectively as ACC, or automatic current
control modes) are used to drive a specific current through the laser diode.
When in this mode, the set point will be in milliamps, and the 4200-DR will drive
the desired current through the laser diode as long as the voltage at the chosen
set point does not exceed the voltage limit. In Io mode, you will be limited to lessthan a 10 Hz bandwidth. To modulate above that rate, use the Io HiBW, which isa high bandwidth current mode supporting modulation.
Im mode (also referred to as AMC, or automatic monitor photodiode control,mode) is used to control the laser diode using the monitor diode feedback. You
select the target monitor diode current, and the 4200-DR will drive exactly
enough forward current through the laser diode to generate the selected monitor
diode current. Only low frequency modulation (10Hz or less) is possible in Im
mode due to the feedback latencies of the photodiode itself.
Po mode (also referred to as APC, or automatic power control, mode) is simply
Im mode with a mathematical constant applied to the set point, providing a
convenient way of operating in milliwatts. Using the PD Resp factor (in μA/mW),a Po set point is internally converted to an equivalent Im set point by the driver,which is then used to control the photodiode feedback. For example, if the PD
Resp factor was 10, then a set point of 1mW would be the same as a set point of
10μA.
Vf mode (also referred to as AVC, or automatic voltage control, mode) is used tocontrol the voltage driven through the device. Unlike ACC mode, AVC mode
allows the current to drive to whatever current is necessary to achieve thevoltage set point, so long as it does not exceed the current limit. As with Im
mode, only low frequency modulation (10Hz or less) is possible in Vf mode.
Modulation
The instrument supports external analog modulation using the Modulation BNC
on the rear panel of the instrument. Modulation rates vary by model, so see yourmodel’s specification for the maximum modulation rates. Only Io HiBW mode
supports high speed modulation. All other modes of operation have amodulation bandwidth of 10Hz or less.

4200-DR Series LaserSource User’s Manual · Page 17

Current Range
When operating in Io or Io HiBW modes, the 4200-DR offers two current
ranges: a high range, which is the maximum rated current for the driver (e.g.,
500mA on a 4205-DR) and low range, which is one-half the maximum rated
current for the driver (e.g., 250mA on a 4205-DR). When the set point is below
the low range limit, the driver will operate with lower noise and greater accuracy.

Power and Cable Connections

LaserSource Rear Panel
Laser Output Connector
The laser Output connector is a female DB-9, and has the following pin-out:
DB-9 Pin
Description
1
Interlock+2
Interlock –3
Earth Ground4
Laser Cathode Voltage Sense
5
Laser Cathode6
Photodiode (PD) Cathode7
Photodiode (PD) Anode8
Laser Anode Voltage Sense
9
Laser Anode
Shell
Earth Ground
Output Connector (DB-9 Female)
Arroyo Instruments has followed industry conventions for laser DB-9
connections, and is likely compatible with pin-outs from other vendors.
Modulation Input
The modulation input BNC on the rear panel accepts a 0V to 10V input signal for
analog set point control of the driver. The modulation input is optically isolated
from the rest of the control circuits in the 4200-DR and electrically isolated fromground, so you should not need to be concerned about ground interferencePage 18 · 4200-DR Series LaserSource User’s Manualfrom any modulation source. The center pin is positive and the outer shell isground.
USB Connector
The USB connector is a standard Type B female connector, and can be plugged
into any USB 1.1 or USB 2.0 port. For more information on using the USB
interface, see the Computer Interfacing Manual which is included on the CDthat accompanied this product.

Connecting to the 4200-DR
A laser diode is very sensitive to electro-static discharge (ESD), over-voltage,
and over-current conditions. When connecting a laser to the 4200-DR, makesure proper ESD procedures are taken. In addition, it is critical that the proper
current limit and voltage limit be set for the laser diode. Exceeding the laser
diode’s rated current or voltage can damage or destroy the laser diode, and the4200-DR’s hardware protection features can only protect the laser diode if theselimits are properly set.

CAUTION
The interlock connections must be kept isolated from allother connections and from earth ground. Failure to doso may damage the instrument.
The Laser anode and cathode outputs are electrically isolated from ground, as
are the photodiode inputs. In addition, the photodiode inputs are opticallyisolated from the laser outputs, ensuring complete electrical isolation of the drive
circuit and photodiode measurement circuit.

NOTE
Connections to the 4200-DR and the laser diode fixture
must be secure. Tighten any screws on the DB-9
connectors, and make sure all connections are in goodcondition. Poor or intermittent connections can damage
or destroy the laser diode.
Arroyo Instruments carries cables specifically designed for these applications,both with a DB connector on the device end or with a bare wire pigtail for
terminating the connection into a custom mount or device:4200-DR Series LaserSource User’s Manual · Page 19

Connector toconnector
1220B

Connector to pigtail(bare wire)
1221B

See the manual for your laser (and fixture) for additional safety and operational
information.
If you will be making your own cables, you must ensure that sufficiently sized
wires are used to carry the current, or excessive heating may occur in the cable.
Below is a table that provides wire gauge recommendations based on operating
current:
Current (A)1 or less2

Recommend Wire Gauge
24 AWG
22 AWG

Remote Mode Operation
Remote mode operation is when the 4200-DR is being controlled by a computer
over the USB interface. When in remote mode, the 4200-DR behaves differently,
preventing you from affecting the operation of the instrument, such as changing
the set point, unless enabled in Comm menu. You cannot enter the menu
without taking the unit out of remote mode, and the knob is disabled.
You can exit remote mode at any time by pressing the Menu button, which has
a secondary function to return the 4200-DR to local operation.
While in remote mode, the Remote LED also acts as an activity indicator, andwill flash whenever there is communication with the computer.
Details on how to communicate with the 4200-DR can be found in theComputer Interfacing Manual which is included on the CD that accompanied
this product.

Installing the USB Drivers
Using the 4200-DR via USB is just as simple as using the serial port. In fact,
once you have installed the USB drivers, the instrument will appear as a virtual
serial port that you can use just like a normal serial port.
To install the drivers, simply plug in the instrument to your computer. When the
Add New Hardware wizard appears, insert the CD you received with the 4200DR and follow the on-screen instructions.

Page 20 · 4200-DR Series LaserSource User’s ManualOnce the drivers are installed, to determine the COM port number, go to Control
Panel and select System. Once the System Properties dialog appears, choose
the Hardware tab then click on the Device Manager button. When the Device
Manager appears, click on the plus sign to the left of Ports. The port identified
as a USB Serial Port is the 4200-DR. In the event you have multiple Arroyo
Instruments products plugged in simultaneously, you will need to experiment to
see which instrument was assigned to which port. For example, you could senda *IDN? query and see which instrument goes into remote mode.

Grounding Considerations
A key feature of the 4200-DR is the optical isolation of both the photodiode andmodulation inputs. By isolating there inputs, earth grounding of the photodiodeanode or cathode, or earth grounding the modulation input, cannot cause aground loop through the instrument. Likewise, the laser anode and cathodeconnections are also isolated from earth ground.
However, if you use the earth ground pin of the OUTPUT connector, it ispossible to create a ground loop if the instrument’s earth ground is connected toa fixture or optical table that is also earth grounded. Make sure that from yourlaser diode package there is only a single path to earth ground.

Analog Modulation
The analog modulation input BNC allows for external control of the current set
point using a 0 to 10V analog signal. 10V equals the maximum operating range,
which is dependent on the model and Range setting. For example, a 4205-DR
operating in the 500mA range will attempt to drive 500mA when 10V is applied
to the modulation input (so the “transfer function” is 50mA/V).
In addition, the set point adds to the modulation input, so using the same 4205DR example, if you were to apply 5V and the set point was 100mA, then the
resulting drive current would be 350mA (5V = 250mA plus the 100mA set point).
You must also consider that the modulation input is not a precision input, so for
accurate current control, you should calibrate the modulation input using a one
point or two point calibration and apply the calibration to your voltage input. The
instrument will display actual current flowing when the display is in large fontmode (press the knob button to change modes), so turn the output on with the
Io set point at 0mA, apply a modulation input signal, and the instrument will
indicate the actual current, which you can use to calibrate your voltage set point.
When modulating at higher frequencies (>1 kHz), it is critical that high quality,
shielded twisted pair cabling be used, and wire size suitable for the appliedcurrent (or the equivalent if using a multi-conductor cable). See the chart below

4200-DR Series LaserSource User’s Manual · Page 21

for suggested sizes. Failure to do so may result in current oscillations that may
damage your laser. When operating in these modes, always use shielded cableand never use individual wires to connect the instrument to your laser. If in
doubt, use a current probe attached to an oscilloscope to monitor actual
performance.
The 1220B or 1221B cables recommended by Arroyo Instruments are shielded
twisted pair, and will provide good modulation performance.

Using Limits
The 4200-DR provides several limit features for protection of the laser diode.
These include current, voltage, intermittent contact, photodiode current, andphotodiode power limits.
Both the laser current and voltage limits are implemented in hardware, providing
for fast response to changes in laser diode operation. When a voltage limit isdetected, the output is immediately shutdown. Because of the sensitivity of thevoltage limit, operating near the limit (within one to two hundred millivolts) is notrecommended. In general, you should set the voltage limit to 0.1V to 0.2V higher
than any anticipated operating point. The voltage limit is tested against thevoltage at the connector, unless in remote voltage sense mode. Any Laser
Cable R value is ignored, as Laser Cable R is a software only calculation, andthe voltage limit is implemented in hardware. See Using the Cable R Setting,above, for more information on the Laser Cable R setting.
Unlike the voltage limit, the current limit simply prevents the 4200-DR fromdelivering more current than the limit is set to. When the current limit engages,
the output will remain on, unless the corresponding bit in the OUTOFF register wasset.
The intermittent contact circuit is designed to protect against faulty connections
by detecting fast changes in voltages which can be caused by poor wiring or
faulty connectors. If false trigging of the intermittent contact circuit is frequently
occurring, it can be turned off from the menu.
The photodiode current and photodiode power limits are implemented insoftware and may take up to one second to trigger when these conditions occur,and therefore should not be relied on to provide fast protection of the laser
diode.

Page 22 · 4200-DR Series LaserSource User’s Manual

Compensating for Voltage Loss
All cables and connectors have a small, but measureable, resistance. Whendriving current through them, this resistance causes a voltage loss in the cable,
and if not compensated for, will result in errors in laser or LED voltage
measurement. In many cases, this is not a problem, as highly accurate voltage
measurements are not required, and the error can be ignored. However, if
accurate voltage measurements are required, the 4200-DR offers two methods
to compensate for this loss: the Cable R setting and four-wire sense. Cable R
compensation is software only, so it requires no special wiring to implement.
Four-wire sense, on the other hand, does require additional wiring, but is themost accurate method. Details on both are found below.
Using Remote Voltage Sense
The 4200-DR supports remote (4-wire type) voltage measurement of the laser
diode, providing a higher accuracy voltage measurement by directly measuring
voltage at the diode itself. While the Cable R setting described below canprovide some of the same benefits of remote voltage sense, remote voltage
sense is a superior method, and they differ in a few key ways:
1.
2.
3.
4.

No need to calculate cable resistance
Voltage measurement is accurate even if the cable resistance changes
The hardware safety circuits use the remote voltage, providing for agreater degree of protection (Vf Limit works on the remote voltage at
the laser rather than the local voltage at the connector)
Works in voltage control mode

The diagram below shows conceptually how to wire the laser to the 4200-DR,
using a 4-wire connection:
LDA Voltage Sense
LDA

4200DRLDALDA Voltage Sense

However, remote voltage sense does have a few drawbacks:
1.
2.

If the remote sense wires are disconnected, it disables the hardware
voltage limit as well as the measurement of laser voltage.
Requires two additional wires to be run to the device.

It is the first of these two drawbacks that is of the biggest concern. In order toprotect against this fault, the instrument always monitors the local voltage at the4200-DR Series LaserSource User’s Manual · Page 23

connector as well as the remote voltage, and if the difference is too great, awarning message is displayed. Once the warning is displayed, it will not be
displayed again until the output is turned off and back on. The warning can bedisabled in the menu by setting the Vf Sense Warn to No.
Using remote voltage sense is very simple. First connect pin 4 of the Output DB9 to the laser cathode, and pin 8 to the laser anode, then in the menu, set Vf
Sense to Remote. Indicated voltage will now be the remote diode voltage.
When using remote voltage sense, any Cable R setting is ignored.
Using the ‘Cable R’ Setting
The Cable R setting allows you to calculate the voltage at the laser by
subtracting the voltage loss through the cable and connectors. This is done bymeasuring or calculating the cable resistance and entering the value, in ohms,
into the menu. The instrument will then use the V = I * R formula to calculate thevoltage loss in the cable and subtract that from the actual measured voltage,displaying the result as Vf on the display.
Common values for Cable R range from 0.0300 Ω to 0.0900 Ω, but can besignificantly higher if you have long runs, many connector interfaces, or small
gauge wire.
While it is possible to use a DMM to measure the resistance of the cable,
because resistance is so small, you will not typically get proper readings (mostDMMs are not designed to properly measure small resistances). A better
approach is to use the instrument to drive current through the system and thenmeasure the voltage loss to determine resistance. There are two ways to best
calculate the voltage loss:
Measure the Voltage at the Laser
If you have an accurate DMM and can measure the voltage across the laser (oraccurately know the voltage of the laser at a specific current) and voltage acrossthe pins at the Output connector, then the difference between the measured
voltages is the voltage loss in the cable. Use this formula to calculate resistance:

Cable R =VOutput − Vlaser
I AMPS

Note that the current is expressed in amps, not milliamps, so divide the set pointby 1000 before using it in this equation.

Page 24 · 4200-DR Series LaserSource User’s Manual

Short the Connection at the End of the Cable
A second method, which does not require a DMM and can be done with just the4200-DR, is to short the anode and cathode wires at the end of the cable(nearest the laser diode), drive current through the cable and note the indicatedvoltage on the 4200-DR. The resistance is found using a simpler version of theformula above:

Cable R =Vf
I AMPS

Note that the current is expressed in amps, not milliamps. The easiest way is todrive 1A of current. When IAMPS equals 1A (1000mA), the displayed voltage isalso the resistance of the cable.
To short the cable, disconnect the laser and short the anode and cathode
together as close to the end of the cable as possible. Ideally, the short should bedone by soldering the anode and cathode wires together to minimize theresistance in the short itself.
How the Calculation Is Used
The 4200-DR continuously takes the measured current, multiplies it by theresistance (Cable R), subtracts the result from the actual voltage at the output
connector, and displays this value on screen as Vf. However, there are some
limitations to how the cable loss calculation is used:
1.

2.

The value for Vf Limit is always the voltage at the connector (except
when using remote voltage sense, see above). This means that the Vf
Limit must take into account all the voltage required, including thecable loss (i.e., the voltage displayed if the Cable R value were zero).
Cable R is ignored in Vf mode. This means that the set point andmeasured voltage are always the voltages at the connector, and Cable
R is not used.

4200-DR Series LaserSource User’s Manual · Page 25

Field Calibration (User Cal)The 4200-DR is typically calibrated annually, and calibration can be done one of
two ways: the instrument can be returned to the factory for a full recalibration, or
the User Cal menu can be used for simpler slope/offset calibration.

CAUTION

Because user calibration directly affects theperformance of the instrument, it must be performed bya qualified technician with sufficiently accurate meters
and test loads to properly measure the actual
performance of the instrument. Failure to do so could
significantly degrade the performance of the instrument
or damage your device.
Factory calibration has the benefit of a full multi-point calibration and verificationof instrument performance against NIST-traceable instrumentation, using
equipment and test loads designed specifically for the application. However,field (or user) calibration is possible, and often desirable, as it allows the user tomeet certification or calibration requirements not available through a factory
calibration.
This field or user calibration is accessible through the User Cal menu, or via the
LASER:USERCAL commands over the computer interface.
For local calibration, the User Cal menu is located under the Advanced menu,
and can be found by pressing the MENU button to enter the main menu,
scrolled to the last entry, which will be the Advanced menu, and then scrollingto the last entry of that menu, which will be the User Cal menu. From there, you
can view the various calibration entries, but editing can only be done bychanging Edit Cal to Yes. Once enabled, the calibration entries can be adjusted
just like any other menu setting.
For each set point or measurement, there is a corresponding slope and offset
calibration. On the 4200-DR series, the following user calibrations are available:

Page 26 · 4200-DR Series LaserSource User’s Manual
Menu Entry
I Set LoM
I Set LoB
I Set HiM
I Set HiB
Im Set M
Im Set B
V Set M
V Set BV Set Rm M
V Set Rm B
I LoM
I LoB
I HiM
I HiB
Im M
Im B
VM
VB
V Rem M
V Rem B

Description
Io set point, low range, slope
Io set point, low range, offset (mA)
Io set point, high range, slope
Io set point, high range, offset (mA)Im set point, slope
Im set point, offset (µA)
Vf local sense set point, slope
Vf local sense set point, offset (V)Vf remote sense set point, slope
Vf remote sense set point, offset (V)Io measurement low range, slope
Io measurement low range, offset (mA)
Io measurement high range, slope
Io measurement high range, offset (mA)
Im measurement, slope
Im measurement, offset (µA)
Vf local sense measurement, slope
Vf local sense measurement, offset (V)Vf remote sense measurement, slope
Vf remote sense measurement, offset (V)When the slope is 1 and the offset is zero, this is considered an“uncompensated” measurement. If you change either the slope or offset, thevalue becomes “compensated” based on these values. The compensation
formula (a linear equation) is very simple:
Compensated = Slope * Uncompensated + Offset
The short form for Slope is typically ‘m’, and the short form for offset is typically‘b’, which is why you see these letters used in the instrument menu (you willoften see this equation written as y=mx+b).
Depending on how you wish to calibrate, a simple offset calibration may besufficient, where only the offset value is adjusted and the slope is left at 1. Thislevel of calibration can be done using a single measurement, and if absoluteaccuracy is only critical at a single point, this may be sufficient. For a slope andoffset calibration, you will need at least two points to compute the slope andoffset, and greater than two points can be used in a least-squares-fit algorithm.
Single Point Offset Calibration
Let’s say that you want to precisely calibrate the instrument at 300mA, and you
are using a 4205-DR in high range. You set the instrument at 300mA, observethat the actual current is 298.6mA and the current measured by the 4205-DR is301.2mA.
To correct the set point, you need to adjust the offset value for the high range Io
set point, which is the I Set HiB menu entry. Considering that you need to raise4200-DR Series LaserSource User’s Manual · Page 27

the set point by 1.4mA, then the I Set HiB menu entry should be adjusted to+1.4mA (the I Set HiM menu entry should be set to 1.000). This willcompensate the set point by increasing it 1.4mA and bring it close to 300.0mA.
The measurement adjustment is similar, but in this case, you need to adjust the I
HiB menu entry to −1.2mA to bring down the measurement to 300mA.
Multi-Point Calibration
Multiple point calibration is mathematically more complex but improves
calibration to operate across a range of values rather than at a single point. The
downside of single point offset calibration is that it can cause the instrument tono longer be in calibration at points away from the calibration point. To keep themath simple in our example, we will only do a two point calibration, but a higher
number of points are possible, and the slope can be calculated using a leastsquares-fit algorithm (offset calculation is the same in either case).
Consider the following two data points, where ‘actual’ is what you are measuringwith your meter, and ‘measured’ is the measured current as displayed by the4200-DR:Set point
100
300

Actual
101.5
298.6

Measured
100.6
301.2

As stated above, correction is done using a linear equation, and we need to
calculate the slope and offset. Slope must be calculated first, and is calculatedusing the following formula:
Slope = (y2 – y1) / (x2 – x1)
For the set point calibration, ‘x’ is the actual current and ‘y’ is the set point. For
the measurement calibration, ‘x’ is the measurement and ‘y’ is the actual current.
Make sure to note how the actual current changes position depending on what
you are calibrating.
The offset is equally simple to calculate:
Offset = y1 – Slope * x1
So for the set point calibration, you would have the following two calculations:
Slope = (300 – 100) (298.6 – 101.5) = 200 / 197.1= 1.0147 (slightly rounded)
Offset = 100 – 1.0147 * 101.5 = −2.9934

Page 28 · 4200-DR Series LaserSource User’s Manual

You can validate your calculations by applying the formula to one or both of thedata points to confirm the compensation is correct. Consider the 300mA set
point … if we apply the values just calculated, we should get a compensationthat increases the set point by slightly over 1.4mA to bring it up to 300mA. Let’scheck:
300mA test point = 1.0147 * 300 − 2.9934 = 301.4166mA – check!
Likewise, the 100mA set point should be lowered by slightly more than 1.5mA:
100mA test point = 1.0147 * 100 − 2.9934 = 98.4766mA – check!
You can make the same tests of the measurement side. By using the multiple
point calibration, you benefit from the calibration across a much wider operating
range. When choosing your two data points, you can either calibrate specificallyfor your application, where the upper point should be the maximum current you
plan to operate, and the lower data point near the minimum current you plan tooperate (but above zero). Alternatively, you can take two generalized data pointsof 80% of the range of the instrument as the upper point and 20% of the range
as the lower point… this latter approach provides a more generated calibrationthat will function across the full range of the instrument.
Accuracy Requirements
When calibrating the instrument, we recommend that the accuracy of your meter
is four times greater than the accuracy you are trying to achieve with the
instrument. For example, if you want to calibrate the laser current to within
0.1mA, then your meter would have an accuracy of 0.025mA or better. Using
lower accuracy meters could actually degrade the accuracy of the instrument
rather than improving it.
Considerations for Calibrating the Laser Current
For current calibration, more meters have poor current measurement
performance. A better approach is to measure the voltage across a known
resistor value. However, this introduces two measurement errors: themeasurement error of the resistance of the current sense resistor, and themeasurement error of the voltage across the current sense resistor, so bothmuch be considered when determining the overall accuracy of yourmeasurement system.

4200-DR Series LaserSource User’s Manual · Page 29

Specifications
4201-DRSET POINTLASER CURRENT (ACC)
Range (mA)
Maximum Resolution (mA)
Accuracy (±[% reading + mA])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
Noise/Ripple (μA rms)
Transients (μA)
Compliance Voltage (V)PHOTODIODE CURRENT (APC)
Range (μA)
Resolution (μA)
Accuracy (±[% reading + μA])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
PD Bias (V)LASER VOLTAGE (AVC)
Range (V)Resolution (V)Accuracy (±[% reading + V])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
EXTERNAL MODULATION
Input Range
Modulation Bandwidth
MEASUREMENT CHANNELSLASER CURRENT
Resolution (mA)
Accuracy (±[% reading + mA])
LASER VOLTAGE
Resolution (V)Accuracy (±[% reading + V])
PHOTODIODE CURRENT
Resolution (μA)
Accuracy (±[% reading + μA])
LIMITSLASER CURRENT
Resolution (mA)
Accuracy (±[% reading + mA])
LASER VOLTAGE
Resolution (V)Accuracy (±% FS)
GENERAL
Display Type
Connector
Computer Interface
Power (50/60 Hz)
Size (H x W x D) [inches (mm)]Operating Temperature
Storage Temperature

4205-DR50
0.002
0.025%+ 0.02100
0.005
0.025%+ 0.03

<1

<1
< 50
10

250
500
0.01
0.02
0.025%
0.025%+ 0.08+ 0.12< 10, 1 hour
50
< 1.2
< 1.5
< 100
10

4220-DR

1000
0.05
0.025%
+ 0.3

2000
0.1
0.025%
+ 0.5

<10

< 15
< 200
5

5 – 5000
0.1
0.05% + 1
< 200, 24 hours< 200
0 to -5V programmable0 – 100 – 100.001
0.05% + 0.005< 50, 1 hour< 100
0 – 10V, 10kΩ
325kHz325kHz0.002
0.025%+ 0.020–5

0.005
0.025%+ 0.030.01
0.025%+ 0.080.02
0.025%+ 0.12150kHz0.05
0.025%+ 0.3

0.1
0.025%+ 0.5

0.001
0.05% + 0.005
0.1
0.05% + 1

2

1
5
0.1
2.5%
2x20 VFD
DB-9, female
USB 2.0 Full Speed
100V / 120V / 230V
1.82(47) x 8.5(215) x 11(280)+10°C to +40°C-20°C to +60°C

20

Page 30 · 4200-DR Series LaserSource User’s Manual

Error Messages
Error
Code

Description

Cause

E-100

General Error

E-102
E-123
E-124

Message too long
Path not found
Data mismatch

E-201

Data out of range

E-202

Invalid data type

E-204

Suffix not valid

E-501

Interlock shutdown
outputE-504

Laser current limit
disabled output.

E-505

Laser voltage limit
disabled output
Laser photodiodecurrent limit disabled
output

The error code is non-specific, and is generally
used when no other error code is suitable.
The message is too long to process.
The message used an invalid path command.
The message contained data that did not matchthe expected format.
The message attempted to set a value that wasoutside the allowable range.
When trying to parse the message, the data wasin an invalid format.
An invalid number base suffix (radix) was
encountered when parsing a number.
The interlock input (pins 1 and 2 of the output
connector) were not shorted when the output wason.
The laser output was turned off because a current
limit was detected and the corresponding bit in
the OUTOFF register was set.
The laser voltage exceeded the voltage limit andthe output was turned off.
The laser output was turned off because aphotodiode current limit was detected and thecorresponding bit in the OUTOFF register wasset.
The laser output was turned off because aphotodiode power limit was detected and thecorresponding bit in the OUTOFF register wasset.
The laser output was turned off because a shortcondition was detected and the corresponding bit
in the OUTOFF register was set.
The laser output was turned off because an outof-tolerance condition was detected and thecorresponding bit in the OUTOFF register wasset.
A hardware control error was detected which
forced a shutdown of the laser output.
A power failure was detected.
A change in the operating mode of theLaserSource while the output was on forced a
shutdown of the laser output.
The LaserSource was not configured properly,
including the mode and output on state, to beable to start the desired calibration process.
The laser output must be on for the calibration
process to start.
Attempted to select Po mode and PD Response

E-506

E-507

Laser photodiodepower limit disabled
outputE-509

Laser short circuitdisabled output

E-510

Laser out of tolerance
disabled output

E-511

Laser control error
disabled output
Power failure
Laser mode change
disabled output

E-512
E-514
E-516

Incorrect configuration
for calibration to start

E-517

Calibration must havethe output on to start
Po mode selected withE-534

4200-DR Series LaserSource User’s Manual · Page 31

E-535
E-536

PD Response set tozero
Calibration cancelledIntermittent contact
fault

W-800

Remote voltage sense
is low

E-998

Command notsupported
Non-specific error

E-999

was zero, or LaserSource was in Po mode and
PD Response was set to zero.
The active calibration process was cancelled.
The instrument detected an intermittent contact
and shut down the laser output. If this is
triggering falsely (such as in a noisy
environment), the intermittent contact detection
can be disabled in the main menu.
When in remote voltage sense mode, theinstrument detected a significant difference
between the remote voltage and the voltage at
the connector, which may indicate a problem withthe remote voltage sense connection.
A command was recognized but not supportedby the instrument.
A non-specific error was encountered.

Page 32 · 4200-DR Series LaserSource User’s Manual

Maintenance and Service
Maintenance
The 4200-DR requires no regular maintenance other than product calibration. To
clean the instrument, use cotton cloth that is only damp (not wet) with a lightsolution of soap and water.
Fuses
Under normal operation, you should never need to replace a fuse. However, ifeither fuse does blow, use only T 250V, 1A, IEC 60127-2 5x20mm metric fuses
as replacements.
If, after replacing the fuse, it continues to blow, immediately discontinue use of
the instrument and contact service for support.
Service
Service and repair for the 4200-DR can be obtained by contacting the distributor
from where you purchased the instrument, or directly from Arroyo Instruments. A
complete list of distributors is available on the Arroyo Instruments web site.
You can contact Arroyo Instruments through one of these methods:
By mail:By phone:
By fax:By email:On the web:Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA 93401
USA+1 (805) 543-1302+1 (805) 543-1303
support@arroyoinstruments.com
http://www.arroyoinstruments.com

In all cases, Arroyo Instruments requires a return materials authorization (RMA)
number. You must contact Arroyo Instruments and obtain an RMA number prior
to returning your instrument, or the shipment may be rejected and sent back toyou.

4200-DR Series LaserSource User’s Manual · Page 33

Warranty
Arroyo Instruments warrants that this product will be free from defects in material
and workmanship and will comply with Arroyo Instruments’ publishedspecifications at the time of sale for a period of one year from date of shipment.
If found to be defective during the warranty period, the product will either be
repaired or replaced at Arroyo Instruments’ option.
To exercise this warranty, write or call your local Arroyo Instruments
representative, or contact the factory directly at the address given above. You
will be given prompt assistance and return instructions. Send the product, freight
prepaid, to the indicated service facility. Repairs will be made and the instrument
returned freight prepaid. Repaired products are warranted for the balance of theoriginal warranty period or 90 days, whichever first occurs.
Limitation of Warranty
The above warranties do not apply to products which have been repaired or
modified without Arroyo Instruments’ written approval, or products subjected tounusual physical, thermal or electrical stress, improper installation, misuse,abuse, accident or negligence in use, storage, transportation or handling. This
warranty also does not apply to fuses, batteries, or damage from battery
leakage.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED ORIMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. ARROYO INSTRUMENTS SHALL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGESRESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS.

Page 34 · 4200-DR Series LaserSource User’s Manual

EC Declaration of Conformity

EC Declaration of Conformity
I/Weof

declare that

Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA
USA
4200-DR Series LaserSource Laser Diode Driver

In accordance with the following directives
EMC Directive: 89/336/EEC
Low Voltage Directive: 73/23/EEC
RoHS Directive: 2015/863/EU
has been designed and manufactured to the following specifications:
EMC Directive Test Standards
EN 61326
Electrical Equipment for Measurement, Control and Laboratory Use EMC
Requirements. This encompasses 10 individual Tests
Low Voltage Directive Test Standards
EN 61010
Electrical Equipment for Measurement, Control and Laboratory Use
Safety Requirements.
This Certificate is the Manufacturer’s Declaration which states that the 4200-DR Series
LaserSource Laser Diode Driver is Compliant to the above noted EU Directives and are
therefore, eligible to bear the CE MARK.
I hereby declare that the equipment named above has been designed to comply with therelevant sections of the above referenced specifications. The unit complies with all
essential requirements of the Directives.
Paul Corr(NAME OF AUTHORIZED PERSON)

President(TITLE OF AUTHORIZED PERSON)(SIGNATURE OF AUTHORIZED PERSON)

June 1, 2011

(DATE OF ISSUE)

4200-DR Series LaserSource User’s Manual · Page 35

UK Declaration of Conformity

EC Declaration of Conformity

I/We
of

declare that

Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA 93401
USA
4200-DR Series LaserSource Laser Diode Driver

In accordance with the following U.K. Legislation Regulations:Electrical Equipment (Safety) Regulations 2016
Electromagnetic Compatibility (EMC) Regulations 2016
The Restriction of the Use of Certain Hazardous Substances inElectrical and Electronic Equipment Regulations 2012
has been designed and manufactured to the following specifications:
EMC Directive Test Standards
EN 61326
Electrical Equipment for Measurement, Control and Laboratory Use EMC
Requirements. This encompasses 10 individual Tests
Low Voltage Directive Test Standards
EN 61010
Electrical Equipment for Measurement, Control and Laboratory Use
Safety Requirements.
This Certificate is the Manufacturer’s Declaration which states that the 4200-DR Series
LaserSource Laser Diode Driver is Compliant to the above noted U.K. Legislation andare therefore, eligible to bear the UKCA MARK.
I hereby declare that the equipment named above has been designed to comply with therelevant sections of the above referenced specifications. The unit complies with all
essential requirements of the U.K. Legislation Regulations.
Paul Corr(NAME OF AUTHORIZED PERSON)

President(TITLE OF AUTHORIZED PERSON)(SIGNATURE OF AUTHORIZED PERSON)

September 27, 2022

(DATE OF ISSUE)

Copyright © 2022, Arroyo Instruments. All Rights Reserved

P/N 530-1028F