Page 2 · 4300 Series LaserSource User’s Manual

Table of Contents
Introduction ............................................................................................... 3
Safety Terms and Symbols ....................................................................... 5
Quick Start ................................................................................................ 7
Installation ................................................................................................. 8
Operation ................................................................................................ 11
Settings and Menus ................................................................................ 14
Control Modes......................................................................................... 18
Using QCW Modes ................................................................................. 19
Cable Wiring for Modulation and QCW................................................... 21
Using the Cable R Setting ....................................................................... 22
Using Remote Voltage Sense (4320 Only) ............................................. 24
Remote Mode Operation ......................................................................... 25
Installing the USB Drivers ....................................................................... 25
Rear Panel ............................................................................................... 26
Connecting to the LaserSource .............................................................. 29
Grounding Considerations ...................................................................... 30
Using Limits ............................................................................................. 30
Thermal Considerations .......................................................................... 31
Specifications .......................................................................................... 32
Error Messages ....................................................................................... 34
Maintenance and Service........................................................................ 36
EC Declaration of Conformity ................................................................. 38
UK Declaration of Conformity ................................................................. 39

4300 Series LaserSource User’s Manual · Page 3

Introduction
Thank you for choosing the LaserSource from Arroyo Instruments. Your
LaserSource is a combination of leading edge technology combined with yearsof experience in the field of current control.
With a crystal clear VFD display, both RS232 and USB computer interfaces, andsmall footprint, the LaserSource will fit into almost any laser diode control
application.
A key feature of the LaserSource is its 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.
Another important feature of the LaserSource is its ability to operate in quasiCW (QCW) mode. This mode permits operation of lasers to a higher current andpower, minimizing the thermal load by turning the laser on for only a brief periodof time, taking measurements, then turning off the laser. The LaserSource
supports both internal and external triggering of pulses, and also includes a
trigger out to synchronize the LaserSource with other instruments.
The LaserSource also operates in constant voltage control mode, allowing you
to use it in precision voltage applications, such as EML devices, or for doing V-I
measurement graphs.
The LaserSource includes another feature not found in other products: theability to program the photodiode bias level from the front panel or over thecomputer interface, to any voltage from 0 to -5V. No more tweaking a
potentiometer with a screwdriver and a DMM. Simply dial in the voltage you
need.
Unlike other laser diode drivers in its class, which use inexpensive 7-segment
displays, the LaserSource takes advantage of its large VFD display tosimultaneously show the set point, laser voltage, and photodiode read back.
The user interface of the LaserSource is engineered to make using the
instrument straightforward. With its text-based menus, there is never any
confusion over which setting is being changed, and parameters are displayed inclear English (no cryptic numbers or LEDs to decode).
The LaserSource offers all the features you would expect from a modern
precision laser diode driver, including:••

10ppm current stability over one hour
2A to 20A current ranges

Page 4 · 4300 Series LaserSource User’s Manual

•
•
•
•

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 reading of current set point, voltage measurement, andphotodiode current or power measurement.

What’s in the Box
Along with the LaserSource itself, a CD with electronic copies of this manual,
the Computer 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.
Accessories
Arroyo Instruments also sells several accessories designed to work with theLaserSource. These include:
•
•
•
•

•

•
•

•
•

LaserSource Cable, 2m (p/n 1220B)
This cable has DB-9 male/female connectors for interfacing to theLaserMount or other connectorized fixtures.
LaserSource Cable, 2m, Pigtailed (p/n 1221B)
This cable has a female DB-9 connector for plugging into theLaserSource and tinned leads for wiring into custom solutions.
LaserSource Cable, 20A, 9W4, 2m (p/n 1228B)
Design for the 4320’s 9W4 connector, this cable is designed for 20A
operation, and has 9W4 male/female connectors.
LaserSource Cable, 20A, 9W4, Pigtailed, 2m (p/n 1229B)
Design for the 4320’s 9W4 connector, this cable is designed for 20A
operation, and has 9W4 male connector on the instrument end andbare wire leads connections on the device end for custom wiring.
LaserSource Cable, Sensor, DB-9, 2m (p/n 1228-S)
Designed for the 4320’s Sensor / Interlock connector, this cable has
DB-9 male and female connectors, and carries the photodiode andremote voltage sense signals.
4300/5300 Series 2U Rack Mount Kit, 1 unit (p/n 1401-RM-1)
4300/5300 Series 2U Rack Mount Kit, 2 units (p/n 1401-RM-2)
For installing your 5300 Series TECSource or 4300 LaserSource intoa standard 19” rack. The 1401-RM-1 is used when installing a single
instrument into a 2U rack space. For mounting two instruments side-byside, use the 1401-RM-2 rack mount kit.
RS-232 NULL Cable, 3m (p/n 1200-NULL)
USB Cable, 3m (p/n 1201)

4300 Series LaserSource User’s Manual · Page 5

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.
Symbols
Power OffPower On

Caution, refer to manual

Earth ground

Caution, risk of electric shock

Page 6 · 4300 Series LaserSource User’s Manual

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.

4300 Series LaserSource User’s Manual · Page 7

Quick Start
The LaserSource was designed with ease of use in mind, and you will likely
have little 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 LaserSource 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 front panel, andthe 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 cable between your LaserMount or other fixture and the
Output connector of the LaserSource. We recommend using our cables as they
have been designed to work well with the LaserSource. If using your own
cables, ensure they have been properly wired according to the pin-out of theLaserSource and your fixture.
Finally, set the set point to an appropriate current and press the Output button.
The output will turn on and you will see the actual voltage and photodiodecurrent displayed on the second line.
It’s that simple. For more detailed operating and installation instructions, readon.

Page 8 · 4300 Series LaserSource User’s Manual

Installation
Installation of the LaserSource is very straightforward, as the quick start section
above illustrated. This section will provide additional details and considerations
for installing your LaserSource.
After unpacking the unit, make sure all packing materials have been removed
and nothing obscures the ventilation ports on the side and front 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.

4300 Series LaserSource User’s Manual · Page 9

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 front 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 LaserSource has vent holes on the side and front of the unit. You must not
block these vent 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
Rack mounting kits (p/n 1401-RM-1 or p/n 1401-RM-2) for standard 19” racks
are available for the LaserSource, and supports the rack mount of one (1401RM-1) or two (1401-RM-2) units in a 2U (3.5”) high opening. Because the unit
draws air from the side, and therefore inside the rack housing, be sure that theinternal rack ambient temperature (which will typically be several degrees higher
than room ambient) does not exceed the unit’s operating temperature. Whenusing 1401-RM-2 to rack mount two units, either unit may also be a 5300 Series
TECSource.

Page 10 · 4300 Series LaserSource User’s ManualWarm-up and Environmental Considerations
In order to achieve the highest level of accuracy, the LaserSource 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.

4300 Series LaserSource User’s Manual · Page 11

Operation
The Front Panel
Operation of the LaserSource 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 simplicity in operation. There are four buttons on
the front panel: Output, Menu, adjustment knob, and the AC power switch.
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 LaserSource menu. When in remotemode, it acts as a Local button, returning the instrument to local mode.
The 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 LaserSource 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.
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

Page 12 · 4300 Series LaserSource User’s Manual

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 LaserSource is its ability to display both the set
point and two measurements simultaneously. The table below shows which
values will appear 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.
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.

4300 Series LaserSource User’s Manual · Page 13

Possible condition messages are:
HiBW The unit is in Io (HiBW) mode.
Pulse The unit is in Io (Pulse) mode.
ExtTrig The unit is in Io (Ext Trig) mode.
Burst The unit is in Io (Burst) mode.
Lock
The interlock is open and the unit cannot be turned on.
Shrt
A short circuit has been detected on the output.
OutT
The unit is out-of-tolerance. See the Tol Time and Tol Io settings formore information.
ILim
The unit is in current limit.
MLim The unit is in photodiode current limit.
PLim
The unit is in photodiode power limit.
Notice that the mode indicators are in reverse text, and are used to highlight theoperating mode.

Page 14 · 4300 Series LaserSource User’s Manual

Settings and Menus
All parameters of the LaserSource can be viewed and changed within themenu. The menus are constructed with the most used parameters first. Tochange any setting, press Menu to enter the menu then rotate the knob to selectthe parameter to change. Press the knob to begin changing the value. As avisual indication that you are in edit mode, you will see an asterisk appear next
to the value. 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.
Menu

Description

Root Menu

Top Level Menu

Factory
Default

Mode

As described in the Control Modes section above,
the unit offers seven control modes: Io (ACC), Io
HiBW (ACC), Io (Pulse), Io (Ext Trig), Io (Burst), Im(AMC), Po (APC), and Vf (AVC). Change thissetting to select a new mode.

Io (ACC)QCW Const

When in Io (Pulse) or Io (Burst) mode, thiscontrols which parameter (frequency or duty cycle)
is adjusted when the pulse width is adjusted. Thissetting will only be displayed when in Io (Pulse) or
Io (Burst) modes.

Freq

QCW Width

Sets the pulse width in QCW mode. See QCW
Mode below for more details. This setting will only
be displayed when in Io (Pulse), Io (Ext Trig), or
Io (Burst) modes.

0.1ms

QCW Duty

Sets the duty cycle in QCW mode. See QCW Modebelow for more details. This setting will only bedisplayed when in Io (Pulse) or Io (Burst) modes.

10%

QCW Freq

Sets the frequency of the QCW pulse. See QCW
Mode below for more details. This setting will only
be displayed when in Io (Pulse) or Io (Burst)
modes.

1000 Hz4300 Series LaserSource User’s Manual · Page 15

Menu

Description

Factory
Default

QCW Pulses

Sets the number of pulses to generate when in Io(Burst) mode. This setting will only be displayedwhen in Io (Burst) mode.

1

DelayIn

Sets the delay, in seconds, from the start of trigger
input pulse to the start of the current pulse. Thissetting will only be displayed when in Io (Ext Trig)
mode.

0.000015s

DelayOut

Sets the delay, in seconds, from the current pulse
to the start of the trigger output pulse. This setting
will only be displayed when in Io (Pulse), Io (ExtTrig), or Io (Burst) modes.

0.000000s

Io limit

This setting controls the maximum amount offorward current that can be delivered to the laser
diode. This limit is implemented in hardware for
immediate response. For more information about
limits, see Using 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 Using 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 Using Limits below.

Maximum

Vf limit

This setting controls the maximum amount offorward voltage that can be delivered to the laser
diode. This limit is implemented in hardware for
immediate response. For more information about
limits, see Using Limits below.

Maximum

Vf Sense

Selects the remote voltage sense lines for diodevoltage measurement. Pins 4 & 5 of the Monitor /Interlock connector must be wiring to the diode.
See Using Remote Voltage Sense below for moredetails. Only available on the 4320.

Internal

Sense Warn

When operating in remote voltage sense mode, if
the remote voltage is significantly lower that thevoltage at the Output connector, a warning
message is displayed. Only available when Vf
Sense is set to External. Only available on the
4320.

Yes

Page 16 · 4300 Series LaserSource User’s Manual
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. Not
available in Io (Pulse), Io (Ext Trig), or Io (Burst)
modes

Off

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.

0.00μA/mW

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

5.0V

Communications Menu

Baud

This sets the baud rate for the RS-232 serial port.
See the Computer Interfacing Manual which isincluded on the CD that accompanied thisproduct.

9600

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 serial or USB interfaces.

No4300 Series LaserSource User’s Manual · Page 17

Menu
Msg Term
Sys Menu

Description

Factory
Default

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

CR/LF

System Settings Menu

Disp Mode

Display mode, which is used to control the layout
on the main screen. Normal will display threevalues, typically the set point current, photodiodeor power readback 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 or 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

Advanced Settings Menu

Off on I Lim

Enables output shutdown on current limit. Adjusts
the OUTOFF register.

No

Off on Im
Lim

Enables output shutdown on photodiode current
limit. Adjusts the OUTOFF register.

No

Off on Po
Lim

Enables output shutdown on photodiode power
limit. Adjusts the OUTOFF register.

No

Off on Out
of Tolerance

Enables output shutdown on out of tolerance.
Adjusts the OUTOFF register.

No

ActiveVTune

Enables active power supply tuning. See thermal
considerations, page 31. Not available on all units.

YesPage 18 · 4300 Series LaserSource User’s ManualControl Modes
The LaserSource offers up to eight laser control modes: Io (ACC), Io HiBW
(ACC), Io (Pulse), Io (Ext Trig), Io (Burst), Im (AMC), Po (APC), and Vf(AVC). The Io (Pulse), Io (Ext Trig), and Io (Burst) modes are only available on
QCW-equipped units.
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 LaserSource will
drive the desired current through the laser diode as long as the voltage at thechosen set point does not exceed the voltage limit. In Io mode, you will belimited to less than a 10 Hz bandwidth. To modulate above that rate, use the Io
HiBW, which is a high bandwidth current mode supporting modulation.
Io (Pulse), Io (Ext Trig), and Io (Burst) are quasi-CW (QCW) modes, where thelaser output is pulsed on based on the pulse width, duty cycle, and frequency,
as defined in the menu. See Using QCW Modes section below for more details.
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 LaserSource 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.

4300 Series LaserSource User’s Manual · Page 19

Modulation
The instrument supports external analog modulation using the Modulation BNC
on the back panel of the instrument. Modulation rates vary by model, so see
your model’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.

Using QCW Modes
Io (Pulse), Io (Ext Trig), and Io (Burst) are quasi-CW (QCW) modes, where thelaser is turned on and off, typically with very short on times and long off times tominimize the thermal loading of the laser. Measurements are taken only during
the on cycle (although at a reduced accuracy and resolution), and external
instruments can by synchronized using the trigger input and trigger output
signals.
In pulse (Io Pulse) mode, the current pulses are based on the pulse width, duty
cycle, and frequency, as defined in the main menu. To use this mode, set theMode to Io (Pulse), and then set the QCW Width, QCW Duty, and QCW Freq
as needed for your application. These three parameters are interrelated as
defined by the following equation:

Frequency =DutyCycle
PulseWidth

However, if you take the values directly from the menu, then a modified versionof this equation that takes the various decimal places of the menu values into
account could be written this way:

QCW Freq =QCW Duty*10
QCWWidth

As an example, a 0.6ms pulse width and 30% duty cycle results in a frequencyof 500 Hz. Put into the formula above, it would be written:

500 =

30
*10
0.6

Because of this relationship, when adjusting any of these parameters, it requiresa change in one of the others. To achieve this, when adjusting frequency, duty
cycle is adjusted and when adjusting duty cycle, the frequency is adjusted. For

Page 20 · 4300 Series LaserSource User’s Manual

pulse width adjustments, the frequency or duty cycle is adjusted based on thesetting of QCW Hold. For example, if QCW Hold is set to Duty, then when thepulse width is adjusted, the frequency is adjusted (the duty cycle is held
constant).
In external trigger mode (Io Ext Trig), only the pulse width is defined by the
instrument. The frequency and duty cycle are defined by the trigger input. For
each rising edge of the trigger input, one current pulse will be generated with thepulse width defined by the QCW Width setting.
Burst mode (Io Burst) operates as a combination of pulse and external trigger
modes. Like pulse mode, the pulse train is defined in terms of frequency andduty cycle, but only a defined number of pulses is generated, which can be as
few as one, or as many as 60,000. Like external trigger mode, no pulses are
generated until a trigger is received. As in external trigger mode, this trigger canbe generated from the trigger input, but unlike external trigger mode, it can also
be generated from the front panel using the Output button. When in burst mode,
the BURST icon will be displayed in the upper right corner of the display.
Burst mode operation from the front panel is distinctly different from the otheroperating modes. Normally, you will use the Output button to turn the output onor off. This is true of burst mode, but the Output button does double-duty: it
serves both as an output on/off button as well as a trigger button. To turn the
output on in burst mode, press and hold the Output button for at least one
second, then release. When you release the button, you will hear an audible
click inside the unit, and the blue LED will start flashing. This indicates the output
is ready to start producing pulses. To generate a pulse train, press and release
the Output button quickly (holding it down for less than one second). On the
button release, the pulse train will start. The blue LED will remain lit solid until thepulse train has completed, at which point it will begin flashing again to indicate
it’s ready to start the next pulse train. To turn the output off, press and hold the
Output button for at least one second, then release.
When triggering remotely (or via the LASER:TRIGGER command), the LED will
also remain lit solid during the pulse train. Also, the LASER:OUTPUT commandis only used to turn the output on or off; use the LASER:TRIGGER command to
start a pulse train.
Laser measurements are made just before the falling edge of the pulse,
maximizing the time the laser has to settle. A hardware sample and holdsamples current, voltage, and power simultaneously, ensuring all threemeasurements are made at the same point in time.
Note that QCW mode is not designed to operate below approximately 3% of therange of the instrument. When operating below this point, the accuracy of thepulse degrades, overshoot increases, and the rise time of the pulse increases.

4300 Series LaserSource User’s Manual · Page 21

These errors can be overcome somewhat by operating at longer pulse widths,
but actual performance can only be determined through empiricalmeasurements using an oscilloscope and current probe.
Trigger In and Trigger Out Delay
Using the trigger in delay (DelayIn), you can delay the beginning of the current
pulse up to 1 second, and only applies in Io (Ext Trig) mode. Likewise, using
the trigger out delay (DelayOut), you can delay when the trigger output up to 1
second from the start of the current pulse.
When setting the trigger in or trigger out values, another pulse cannot start until
the current pulse (which starts after the trigger input delay) and the trigger
output have both completed. This can limit the range of the frequency or duty
cycle if the trigger delays are large.
For example, if the trigger output delay is 10 milliseconds and the pulse width is
1 millisecond, then the minimum duty cycle is about 10%, because the next
pulse cannot start until after the trigger output is complete.

Cable Wiring for Modulation and QCWWhen modulating at higher frequencies (>1 kHz) or operating in QCW modes, itis critical that high quality, shielded twisted pair cabling be used, and wire size
suitable for the applied current (or the equivalent if using a multi-conductor
cable). See the chart below for suggested sizes. Failure to do so may result incurrent oscillations that may damage your laser. When operating in thesemodes, always use shielded cable and 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.
Arroyo Instruments’ cables are shielded, twisted-pair cables, and designed tosupport these applications. For questions, contact the factory or your local
representative for additional help.
Current (A)
2
4
8
20

Recommend Wire Gauge
22 AWG
20 AWG
18 AWG
14 AWG

Page 22 · 4300 Series LaserSource User’s Manual

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. A
better approach is to use the instrument to drive current through the system andthen measure the voltage loss to determine resistance. There are two ways tobest 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.
Short the Connection at the End of the Cable
A second method, which can be done with just the 4300, is to short the cable atthe end of the cable (nearest the laser diode), drive current through the cableand measure the voltage. The resistance is found using an simpler version of theformula above:

Cable R =V4300
I AMPS

4300 Series LaserSource User’s Manual · Page 23

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 4300 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 below). 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.

Page 24 · 4300 Series LaserSource User’s Manual

Using Remote Voltage Sense (4320 Only)
The 4320 LaserSource 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 above
can provide some of the same benefits of remote voltage sense, 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 voltage at the laser
rather than the voltage at the connector)
Works in voltage control mode

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

If the remote sense wires are disconnected, it disables the hardware
voltage limit
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 monitors the voltage at the connector aswell as the remote voltage, and if the difference is too great, a warning 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 be disabled in the menu
by setting the Ext Low Warn to Off in the menu.
Using Remote Voltage Sense
Using remote voltage sense is very simple. First connect pin 4 of the Monitor /Interlock DB-9 to the laser cathode, and pin 5 to the laser anode, then in themenu, set Vf Sense to External. Indicated voltage will now be the remote diodevoltage.
When using remote voltage sense, any Cable R setting is ignored.

4300 Series LaserSource User’s Manual · Page 25

Remote Mode Operation
Remote mode operation is when the LaserSource is being controlled by acomputer over the USB or RS232 interfaces. When in remote mode, theLaserSource behaves differently, preventing you from affecting the operation of
the instrument, such as changing the set point. 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 LaserSource 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 LaserSource can be found in theComputer Interfacing Manual which is included on the CD that accompanied
this product.

Installing the USB Drivers
Using the LaserSource 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 theLaserSource and follow the on-screen instructions.
Once 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 an Arroyo Instruments Virtual COM Port or USB Serial Port is theLaserSource. 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 send a *IDN? query andsee which instrument goes into remote mode.

Page 26 · 4300 Series LaserSource User’s Manual

Rear Panel
In addition to the input power connector described above, there are six
connectors on the rear panel of the LaserSource: the output connector,
modulation input BNC, trigger input and output BNCs, USB connector, andRS232 connector.

LaserSource Rear Panel

4320 LaserSource Rear Panel
Laser Output Connector
Except for the 4320 LaserSource, the Output connector is a female DB-9, andhas the following pin-out:

4300 Series LaserSource User’s Manual · Page 27

DB-9 Pin
Description
1
Interlock+2
Interlock –3
Earth Ground4&5
Laser Cathode6
Photodiode (PD) Cathode7
Photodiode (PD) Anode8&9
Laser Anode
Shell
Earth Ground4302/4304/4308 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.
On the 4320, the laser diode connections appear on a 9W4 Output connector,
and the photodiode and interlock appear on the DB-9 Monitor / Interlock
connector. In addition, the 4320 also supports remote voltage sense of the laser,
and these connections also appear on the Monitor / Interlock connector, as
detailed below:
9W4 Pin
Description
A1
Laser AnodeA2
No Connection
A3
Laser CathodeA4
No Connection
Signal Pins No Connection
Shell
Earth Ground4320 LaserSource Output Connector (9W4 Female)
DB-9 Pin
Description
1
Interlock+2
Interlock –3
Earth Ground4
Laser Cathode Remote Sense
5
Laser Anode Remote Sense
6
Photodiode (PD) Cathode7
Photodiode (PD) Anode8&9
No Connection
Shell
Earth Ground4320 LaserSource Monitor / Interlock Connector (DB-9 Female)
The Interlock pins must be shorted together to allow the output to turn on. For
the 4320, a shorting plug is included with the product for this purpose.

Page 28 · 4300 Series LaserSource User’s Manual

Modulation Input
The modulation input BNC 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 LaserSource and electrically isolated from ground, so
you should not need to be concerned about ground interference from any
modulation source. The center pin is positive and the outer shell is ground.
Trigger Input & Output
The trigger input and output BNCs are used in QCW modes. For more
information on their use, see the Using QCW Modes section above.
BNC
Description
Center Pin
Signal+Shell
GroundTrigger In and Trigger Out Connects (BNCs)
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.
RS232 Connector
The RS232 connection is male DB-9 connector wired in a NULL modem
configuration.
Pin
Description
2
Receive
3
Transmit
5
Ground
1,4,6
Commoned together
7,8Commoned together
9
No connection
Shell
Earth ground
RS232 Connector (DB-9 Male)For more information on using the RS232 interface, see the Computer
Interfacing Manual which is included on the CD that accompanied this product.

4300 Series LaserSource User’s Manual · Page 29

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

NOTE
While connecting to only one of the DB-9’s cathode(pins 4 and 5) and anode (pins 8 and 9) connections isrequired, you should connect cathode to both pins 4
and 5, and anode to both pins 8 and 9 to provide thebest connection through the DB-9 connector.

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 LaserSource and the laser diodefixture 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.

Page 30 · 4300 Series LaserSource User’s Manual

Depending on the model, Arroyo Instruments carries cables specificallydesigned for this application:

All but 4320

Model

Connectors

DB-9 male to DB-9 female
DB-9 male to bare wire pigtail

Cable P/N
1220B
1221B

4320

9W4 male to 9W4 female
9W4 male to bare wire pigtail

1228B
1229B

Cable Options
See the manual for your laser (and fixture) for additional safety and operational
information.

Grounding Considerations
A key feature of the LaserSource is the optical isolation of both the photodiodeand modulation inputs. By isolating there inputs, earth grounding of thephotodiode anode or cathode, or earth grounding the modulation input, cannot
cause a ground loop through the instrument. Likewise, the laser anode andcathode connections are also isolated from earth ground.
However, if you use the earth ground pin of the Output connector (pin 3), 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.

Using Limits
The LaserSource provides several limit features for protection of the laser
diode. These include current, voltage, intermittent contact, photodiode current,
and photodiode power limits.
Both the current and voltage limits are implemented in hardware, providing forfast 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 Cable R
value is ignored, as Cable R is a software only calculation, and the voltage limit
is implemented in hardware. See Using the Cable R Setting, above, for more
information on the Cable R setting.

4300 Series LaserSource User’s Manual · Page 31

Unlike the voltage limit, the current limit simply prevents the LaserSource fromdelivering more current than the limit is set to. When the current limit engages,
the output will remain on.
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.

Thermal Considerations
The LaserSource is designed to provide high power in a small enclosure. Some
controllers use an adjustable power supply that is tuned to meet the needs ofyour load. High current controllers, such as the 4308 and 4320, have minimum
load voltage requirements when operating at their highest current levels. If moreheat than the LaserSource can manage is generated inside the instrument, it
will automatically shut itself off and generate an E-537 error message.
If your instrument thermally trips, you can add series resistor with the laser toincrease the load voltage. Size the value and power rating of the resistor to beappropriate to the amount of voltage you need to add. You can consult thefactory for more information and support in sizing the resistor.
Below are the minimum compliance graphs for the 4308 and 4320. The 4302
and 4304 have no minimum compliance requirements. Please consult thefactory for minimum compliance requirements of other LaserSource models.

4308 Minimum Compliance Voltage

4320 Minimum Compliance Voltage

Page 32 · 4300 Series LaserSource User’s Manual

Specifications
Description
CW Mode Specifications
SETPOINTLASER CURRENT
Range (mA)
Resolution (mA)
Accuracy (±[% set+mA])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
Noise/Ripple (μA rms)
Transients (μA)
Compliance Voltage (V)PHOTODIODE CURRENT
Range (μA)
Resolution (μA)
Accuracy (±[% set+μA])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
PD Bias (V)LASER VOLTAGE
Range (V)Resolution (V)Accuracy (±[% set+V])
Stability (ppm, time)
Temperature Coeff (ppm/°C)
EXTERNAL MODULATION
Input Range
Modulation Bandwidth
MEASUREMENTLASER CURRENT
Resolution (mA)
Accuracy (±[% reading+mA])
LASER VOLTAGE
Resolution (V)Accuracy (±[% reading+V])
PHOTODIODE CURRENT
Resolution (μA)
Accuracy (±[% reading+μA])

4302

Specifications
4304
4308

0 – 2000
0.1

0 – 4000
0.1

0 – 8000
0.5

0 - 20,000
1

0.05% + 0.4

0.05% + 0.8

0.05% + 1.6

0.05% + 4

< 20
< 300
15

< 10, 1 hour
50
< 30
< 60
< 400
< 600
8
4

4320

< 5000< 50mA5

25 – 20000
1
0.05% + 2
< 200, 24 hours< 200
0 to -5V, programmable0 – 15

0–8

0–5

65kHz

0 – 10V, 10kΩ
50kHz
40kHz

10kHz

0.1
0.05% + 0.4

0–4
0.001
0.05% + 0.005< 50, 1 hour
< 100

0.1
0.05% + 0.8

0.5
0.05% + 1.6

10.05% + 4

0.001
0.05% + 0.004
1
0.05% + 2

QCW Mode Specifications
SETPOINTLASER CURRENT (ACC)
Range (mA)
Resolution (mA)
Accuracy (±[% set+mA])
Compliance Voltage (V)MEASUREMENTLASER CURRENT
Resolution (mA)
Accuracy (±[% reading+mA])

15 – 2000
1
0.5% + 2
15

25 – 4000
1
0.5% + 4
8

50 – 8000
1
0.5% + 10
4

150 – 20000
1
0.5% + 25
51
3% + 41
3% + 81
3% + 16

1
3% + 30

4300 Series LaserSource User’s Manual · Page 33

Description

Specifications

LASER VOLTAGE
Resolution (V)Accuracy (±[% reading+V])
PHOTODIODE CURRENT
Resolution (μA)
Accuracy (±[% reading+μA])
PARAMETERESPULSE WIDTH
Range (ms)Resolution (ms)Accuracy (ms)
FREQUENCY
Range (Hz)Resolution (Hz)
Accuracy (Hz)DUTY CYCLE
Range (%)
Resolution (%)
Rise/Fall Times (µs)
Overshoot (%)
Zero Current (% of set)

0.01
2% + 0.04
102% + 100

0.1 – 600
0.001
0.015
1 – 1000
0.1
0.5
0.1 – 90
0.1
< 20 / < 10
<7
7.5

< 50 / < 10

LIMITSLASER CURRENT
Resolution (mA)
Accuracy (±[% reading+mA])
LASER VOLTAGE
Resolution (V)Accuracy (±% FS)

20

1
40

80

100
200

0.1
2.5%

GENERAL
Display Type
Laser Connector
Photodiode/Interlock
Connector
Computer Interface
Power (50/60 Hz)
Size (H x W x D) [inches (mm)]Weight (lbs [kg])Operating Temperature
Storage Temperature

2x20 VFD
DB-9, female
9W4, female
On LDD
DB-9,
connector
FemaleUSB 2.0 Full Speed (Type B), RS-232 (DB-9, male)
100V / 120V / 230V
3.47 (89) x 8.5 (215) x 12 (305)
6.4 [2.9]
7.8 [3.5]+10°C to +40°C-20°C to +60°C

Page 34 · 4300 Series LaserSource User’s Manual

Error Messages
Error
Code

Description

Cause

E-100

General Error

E-102

Message too long

E-123

Path not foundE-124

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 (USB/Serial
only).
The message used an invalid path command(USB/Serial only).
The message contained data that did not matchthe expected format (USB/Serial only).
The message attempted to set a value that wasoutside the allowable range (USB/Serial only).
When trying to parse the message, the data wasin an invalid format (USB/Serial only).
An invalid number base suffix (radix) was
encountered when parsing a number (USB/Serial
only).
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 shutdown
the output.
The LaserSource was not configured properly,
including the mode and output on state, to be

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4300 Series LaserSource User’s Manual · Page 35

E-517
E-534
E-535
E-536

Calibration must havethe output on to start
Po mode selected with
PD Response set tozero
Calibration cancelledIntermittent contact
fault

E-537

Thermal trip

W-800

Remote voltage sense
is low

W-801

Burst Mode, Hold
OutputE-998

Command notsupported
Non-specific error

E-999

able 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
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.
Excessive power dissipated inside unit. Lower
voltage limit or add series resistance. See“Thermal Considerations” for more details.
When in remote voltage sense mode, the 4320
detected a significant difference between the
remote voltage and the voltage at the connector,
which may indicate a problem with the remotevoltage sense connection.
When in Io (Burst) mode, to turn the output on,
the Output button must be held down for at least
one second. If it is held down for less than one
second, this warning message informs the user
than the Output button press did not turn the
output on.
A command was recognized but not supportedby the LaserSource.
A non-specific error was encountered.

Page 36 · 4300 Series LaserSource User’s Manual

Maintenance and Service
Maintenance
The LaserSource requires no regular maintenance other than productcalibration. To clean the instrument, use cotton cloth that is only damp (not wet)with a light solution 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 LaserSource 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.

4300 Series LaserSource User’s Manual · Page 37

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 38 · 4300 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 93401
USA
4300 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 4300 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)

28 February 2008

(DATE OF ISSUE)

4300 Series LaserSource User’s Manual · Page 39

UK Declaration of Conformity

EC Declaration of Conformity

I/We
of

declare that

Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA 93401
USA
4300 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 4300 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 530-1010N