Page 2 · 6300 Series ComboSource User’s Manual

Table of Contents
Introduction ............................................................................................... 3
Safety Terms and Symbols ....................................................................... 5
Quick Start ................................................................................................ 7
Installation ................................................................................................. 8
Operation ................................................................................................ 11
Settings and Menus ................................................................................ 15
Saving and Restoring Configurations ..................................................... 22
Using the Function Keys ......................................................................... 23
Connecting to the ComboSource ........................................................... 25
Power and Cable Connections ............................................................... 26
Grounding Considerations ...................................................................... 28
Remote Mode Operation ......................................................................... 28
Installing the USB Drivers ....................................................................... 29
Thermal Considerations .......................................................................... 29
Using the Laser Driver ............................................................................. 32
Laser Control Modes ............................................................................... 32
Using the Laser Limits ............................................................................. 33
Analog Modulation .................................................................................. 33
Compensating for Voltage Loss.............................................................. 34
Using the Temperature Controller .......................................................... 38
TEC Control Modes ................................................................................. 38
Using the TEC Limits ............................................................................... 38
Selecting the Fixture ............................................................................... 38
Working With Thermistors ....................................................................... 39
Working With RTDs ................................................................................. 40
Working With AD590s and LM335s ........................................................ 42External Fan Control ............................................................................... 42
Resistive Heaters and Heat/Cool Only Modes........................................ 43
Gain Control and the PID Loop ............................................................... 43
Using the AutoTune Function ................................................................. 44
Using the AutoTune Function Remotely ................................................. 46
Compensating for TEC Cable Resistance .............................................. 47
Field Calibration (User Cal) ..................................................................... 48
Specifications .......................................................................................... 53
Error Messages ....................................................................................... 56
Maintenance and Service........................................................................ 59
EC Declaration of Conformity ................................................................. 61
UK Declaration of Conformity ................................................................. 62

6300 Series ComboSource User’s Manual · Page 3

Introduction
Thank you for choosing the ComboSource from Arroyo Instruments. The
ComboSource combines the features of our LaserSource and TECSource intoa single, powerful instrument. The ComboSource represents years ofexperience in the field of current and temperature control.
With a large, crystal clear VFD display, both RS232 and USB computerinterfaces, and small footprint, the ComboSource will fit into almost any laser
diode control application. Unlike other controllers in its class, which use
inexpensive 7-segment displays, the ComboSource takes advantage of its large
VFD display to simultaneously show the set points and measurements.
The ComboSource also includes complete optical isolation of both modulationand photodiode inputs. By isolating these inputs, it prevents unwanted groundloop problems. No other laser diode driver in the industry has this feature. The
ComboSource 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 user interface of the ComboSource 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 ComboSource offers all the features you would expect from a modern
precision laser controller, including:•••Laser driver:o 10ppm current stability
o 100mA to 4A current ranges
o High compliance versions for QCL applicationso Comprehensive laser protection circuitry, including hardware
voltage and current limits, and fast transient shutdown.
o External analog modulationo Power mode control, both in photodiode current (AMC) or
computed photodiode power (APC) modes.
Temperature Controller:o AutoTune for automatic PID parameter calculationo 0.004°C temperature stability and 0.01°C set point resolution
o 60W (5A/12V) output power
Simultaneous display of set points and readings

Page 4 · 6300 Series ComboSource User’s ManualWhat’s in the Box
Along with the ComboSource 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 the
ComboSource. 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.
1260B TECSource Cable, 5A, 2m
This cable has DB-15 male/female connectors for interfacing to theLaserMount or other connectorized fixtures, and supports up to 5A of
TE current and connections for the fan interface. A pigtailed version ofthis cable, with tinned ends for soldering into custom solutions, isavailable as p/n 1261B.
1401-RM-1 4300/5300/6300 Series 2U Rack Mount Kit, 1 unit
1401-RM-2 4300/5300/6300 Series 2U Rack Mount Kit, 2 units
For installing your instrument into a standard 19” rack. The 1401-RM-1
is used when installing a single instrument into a 2U rack space. For
mounting two instruments side-by-side, use the 1401-RM-2 rack mountkit. A 1401-RM-1 cannot be converted to a 1401-RM-2, or vise versa,
so be sure to purchase the correct rack mount kit.
10kΩ Thermistor (p/n 1600-10K)
100Ω Platinum RTD (p/n 1600-100RTD)
1200-NULL RS-232 NULL Cable, 2m
1201 USB Cable, 3m

6300 Series ComboSource 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 · 6300 Series ComboSource 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.

6300 Series ComboSource User’s Manual · Page 7

Quick Start
The ComboSource was designed with ease of use in mind, and you will likely
have little need for this manual for most 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 ComboSource istypically shipped in the 120V configuration from the factory, but always verify thevoltage selection. Change the voltage as needed. For more information, refer toChanging the Voltage Selection under the Installation 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, select the »Goto Laser Menu bypressing the knob, then scroll down until Io Lim setting is displayed. Press theknob again to edit the setting, and adjust the limit as appropriate to your laser
diode. Press the knob again to save the value. Scroll down and make the same
adjustments to the voltage limit (Vf Lim). Next, you should adjust thetemperature control settings appropriate for your device. Scroll back to the topof the list and choose «Return to Main Menu, scroll down and select »Goto
TEC Menu, then scroll down and adjust the TEC current limit (I Lim) and highand low temperature limits (T-High Lim and T-Low Lim), as appropriate for yourapplication. Once you have made all your adjustments, press the Menu button
to exit the menu.
The unit comes pre-programmed for the BetaTHERM 10K3A1 thermistor. If the
ComboSource is being connected to a LaserMount, no changes need to be
made, as this is the thermistor used in the mount (except for 150°C rated
mounts, which use RTDs). However, if you are using a different manufacturer’s
thermistor or BetaTHERM thermistor, you will need to select the correct sensor
and verify the coefficients are set correctly. Change the Sensor setting andnavigate to the Sensor Coeffs sub-menu, pressing the knob to enter the submenu. Adjust the constants to reflect the values for your sensor, if needed.
Next, connect the cables between your LaserMount or other fixture and the
LASER and TEC OUTPUT connectors of the ComboSource. We recommend
using our cables as they have been designed to work well with the
ComboSource. If using your own cables, ensure they have been properly wired
according to the pin-out of the ComboSource and your fixture.

Page 8 · 6300 Series ComboSource User’s Manual

Finally, set the set points to an appropriate current and temperature and press
the On/Off buttons to turn the outputs on. Typically, you will want to turn the
TEC on first, allow it to stabilize, and then turn on the laser. When turning on thelaser for the first time, it is a good 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 and minimize any chance of damaging the laser. Onceyou have confirmed proper operation, the set point can be left at the desired
operating point, and simply use the On/Off button to turn the laser on and off.
If you notice the temperature is oscillating around the set point and notstabilizing, you may need to adjust the Gain setting in the menu. You can use
the AutoTune feature to automatically calculate the best PID values, or selectfrom a set of eight factory preset values that typically cover most applications.
To use the factory gains, if the temperature is quickly jumping up and down, theGain will typically need to be reduced. If the temperature is slowly moving up
and down, try a higher Gain. You may need to experiment with several gain
settings to find the ideal value, and for even finer control, you can set the Gain to
PID and directly set the PID control values.
For more detailed operating and installation instructions, read on.

Installation
Installation of the ComboSource is very straightforward, as the quick start
section above illustrated. This section will provide additional details andconsiderations for installing your ComboSource.
After unpacking the unit, make sure all packing materials have been removed
and nothing obscures the ventilation ports on the sides 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 on the sides of thevoltage indication to release the voltage selection module from the IPC, as
shown in the picture below.

6300 Series ComboSource User’s Manual · Page 9

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.

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 ComboSource has vent holes on both sides of the unit. You must not blockthese vent holes, or overheating may occur, causing damage to the unit.

Page 10 · 6300 Series ComboSource User’s Manual

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 ComboSource, 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 4300 Series
LaserSource or 5300 Series TECSource.
Warm-up and Environmental Considerations
In order to achieve the highest level of accuracy, the ComboSource should bepowered on for at least one hour prior to taking measurements. In addition,
ensure that the unit is not operating outside the operational temperature range
or humidity conditions.

6300 Series ComboSource User’s Manual · Page 11

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

6300 ComboSource Main Screen
The front panel is designed for ease of operation. There is an On/Off button for
the Laser and TEC outputs, one to change which set point is adjusted by theknob, and one to enter the menu. The remaining three keys are the function
buttons, which can be assigned a variety of actions. More information on thefunction keys are available in the section titled Using the Function Keys, below.
The outputs are controlled via the two On/Off buttons:••

For the laser, when turning the output on, there is a programmabledelay (factory default of 3 seconds) where the unit will indicate that theoutput is on (the blue output LED will be lit), but the output stage is, infact, not on. This is a CDRH safety feature required for some laser
applications, and this delay can be adjusted in the menu. The output
will be energized once the delay has expired.
For the TEC, when the output is turned on, it will immediately begin
driving current as needed to achieve the set point.

The Menu button is used to enter the ComboSource menu. When in remotemode, it also 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/enter

Page 12 · 6300 Series ComboSource User’s Manual

button, primary used when making changes in the menu, but can also be used
to change the view mode in the main display (see Main Display Screen below).
There are eight LEDs: two blue LEDs to indicate the on/off state of the laser orTEC; a red Error LED that indicates an error has occurred; a yellow Remote
LED that indicates the unit is being controlled via a computer; two green LEDs toindicate which set point will be adjusted by the knob; and two more green LEDs
to indicate which current control range is active.
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 both set points and measurements. Which set
point and measurements are displayed is dependent on the control mode you
have selected.
You can select which set point is adjusted by pressing the Select button. The
active set point is displayed on the screen via inverted text, and either the Laseror TEC selection LED will be lit.
You can also control the size of the characters by enlarging either the Laser, theTEC, or both. When on the main display, this can be done by pressing the Enterbutton (the knob), or by changing the Display setting in the System menu.
When in large display mode, only the actual operating value is displayed. Whenthe set point is changed via the knob, the display will briefly show the set point,
and then return to displaying the actual measurement.

6300 Series ComboSource User’s Manual · Page 13

Example displays are shown below:

IoSET= 3850.1mA .LoBW.
Im=950.1µA Vf=1.941V
TSET= 25.00°C V= 6.72V
T= 25.00°C I= 3.25A
Main Display: Both Small

Io= 3850.1
TSET= 25.00°C V= 6.72V
T= 25.00°C I= 3.25A
Main Display: Laser Large

IoSET= 3850.1mA .LoBW.
Im=950.1µA Vf=1.941V

T=

25.00

Main Display: TEC Large

Io= 3850.1
T=
25.00
Main Display: Both Large
Measurements
One of the advantages of the ComboSource is its ability to display both the set
point and measurements simultaneously (when in small display mode). The
table below shows which values will appear on the display depending on themode selected:

Page 14 · 6300 Series ComboSource User’s Manual

Mode
Laser
Io
Im
Po
Vf
TEC
T
R
ITE

Setpoint

Displayed Measurements

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

Temperature (°C)
Sensor (kΩ, mV, uA, or Ω)
TEC current (A)Temperature, current and voltage
Sensor, current and voltage
Temperature, current and voltage

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 Laser or TEC Control Modes sections below for more information on thevarious modes.
Status Messages
The instrument will display status messages in upper right corner indicating
several different conditions for the laser 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 laser condition messages are:
LoBW
HiBW
Script
Lock
Shrt
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 in current limit.
The unit is in photodiode current limit.
The unit is in photodiode power limit.

Notice that LoBW and HiBW mode indicators are in reverse text, and are used tohighlight the operating mode.

6300 Series ComboSource User’s Manual · Page 15

Settings and Menus
All parameters of the ComboSource can be viewed and changed within themenu. The menus are constructed with the most used parameters first, andgrouped by section. To change any setting, press Menu to enter the menu thenrotate the knob to select the submenu. The laser settings are grouped below theLaser menu, the TEC settings are grouped below the TEC menu, etc. To enter amenu or begin edting a setting, simply press the knob to begin changing thevalue. As a visual 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 themenu, while pressing the knob will store the value but leave you in the menu to
make additional changes.
Description

Factory
Default

Mode

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

Io (ACC)

Range

Selects the high or low current range. Only applies
in Io or Io HiBW modes (all other modes operate inhigh range).

High

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

Depends on
model

Io 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 Using the Laser 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 the Laser 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 the Laser Limits
below.

Maximum

Menu

Laser Menu

Page 16 · 6300 Series ComboSource User’s Manual
Description

Factory
Default

Vf Limit

This setting controls the maximum allowable
operating voltage of the laser diode. This limit is
implemented in hardware for high speed
response. For more information about limits, seeUsing the Laser 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

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.

10.0mA

Menu

Off
0.00μA/mW

5.0V

6300 Series ComboSource User’s Manual · Page 17

Menu
On Delay

Description

Factory
Default

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

3000msLaser Menu » Advanced
Off if TEC
Off

Turns off the laser output if the TEC turns off

No

Off if TEC
Tlim

Turns off the laser output if the TEC exceeds thetemperature limitNo

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 is exceededYes

Off if OutTol

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

Laser Menu » Advanced » User Cal
Edit Cal

Must be set to Yes before user calibration settings
can be changed.

No

Reset Cal

Reset the Laser 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

Mode

This sets the operating mode (T Mode, R Mode, or
Ite Mode) of the temperature controller.

T ModeMount

Specify the mount connected to the
ComboSource. If using a LaserMount, select theappropriate model. Otherwise, select User Defined.

User
DefinedI Lim

I Lim sets the current limit of the temperature
controller. The limit should be set to a value that issuitable for your Peltier device.

3A

TEC Menu

Page 18 · 6300 Series ComboSource User’s Manual

Menu

Description

Factory
Default

Gain

Gain controls the response of the temperature
controller. A higher gain value will cause thecontroller to respond more quickly to the difference
between the set point and the actual temperature,
while a lower value will cause it to respond more
slowly. Select PID for direct access to the PID
parameters. Read more on setting gain below.

10

PID P

The proportional term of the PID loop. Will only beavailable if Gain is set to PID.

1

PID I

The integral term of the PID loop. Will only beavailable if Gain is set to PID.

0.01

PID D

The derivative term of the PID loop. Will only beavailable if Gain is set to PID.

0

SensorSets the temperature measurement sensor. Can be
Therm 100uA, Therm 10uA, LM335, AD590, RTD,
or RTD (4-wire), RTD 1k, or RTD 1k (4-wire).

Therm
100uA

T-Low Lim

T-Low Lim is the lower temperature limit. If
operating in T Mode and the actual temperaturedrops below this value, the output will be turned
off. Temperature limits not monitored in R Mode or
Ite Mode. Limit monitoring can also be disabled insoftware (see TEC:ENAB:OUTOFF command).

-99°C

T-High Lim

T-High Lim is the upper temperature limit. If
operating in T Mode and the actual temperaturerises above this value, the output will be turned off.
Temperature limits not monitored in R Mode or Ite
Mode. Limit monitoring can also be disabled insoftware (see TEC:ENAB:OUTOFF command).

125°C

R-Low Lim

R-Low Lim is the sensor low limit. If operating in R
Mode and the actual sensor measurement drops
below this value, the output will be turned off. R
limits are not monitored in Ite Mode. Limit
monitoring can also be disabled in software (seeTEC:ENAB:OUTOFF command).

0.01kΩ

R-High Lim

R-High Lim is the sensor high limit. If operating in
R Mode and the actual sensor measurement
exceeds this value, the output will be turned off. R
limits are not monitored in Ite Mode. Limit
monitoring can also be disabled in software (seeTEC:ENAB:OUTOFF command).

45kΩ

6300 Series ComboSource User’s Manual · Page 19
Description

Factory
Default

Tol Time

Tolerance time is the amount of time, in seconds,
that the actual temperature must be within the set
point temperature +/- the Tol Temp value for theunit to be considered in tolerance.

5 seconds

Tol Temp

Tolerance temperature is a temperature band (in°C) around the set point temperature. When theactual temperature is within this band for longer
than the Tol Time setting, then the unit isconsidered to be in tolerance.

0.1°C

H/C ModeThis selects the heating and/or cooling mode of
the ComboSource. See the section below titled“Resistive Heaters and Heat/Cool Only Modes” formore information.

Heat/CoolExt FanThis selects the voltage for the auxiliary fan power
supply. See the section below titled “External Fan
Control” for more information.

Off

Ext Fan Pwr

When Ext Fan is set to Custom, this sets the
specific fan voltage from 4.0 to 12.0 volts. See the12.0

Ext FanModeControls when the fan operates. See theExternal Fan Control section below for more
information.

Auto

Ext Fan Off

When Ext Fan Mode is set to Delay, this setting
defines the number of minutes to delay turning off
the fan after the TEC output has been turned off.

5 minutes

The resistance of the cable and connectors, inohms. This setting allows for accurate voltage
measurement at the TEC by removing the voltage
loss of the cable.

0.0080Ω

Menu

External Fan Control section below for more
information.

See the External Fan Control section below
for more information.
Cable RTEC Menu » Sensor Coeffs
ThermA

The A term in the Steinhart-Hart equation.

1.12924E-03

ThermB

The B term in the Steinhart-Hart equation.

2.34108E-04

ThermCThe C term in the Steinhart-Hart equation.

0.87755E-07

RTD A

The A term in the RTD equation.

3.98480E-03

RTD B

The B term in the RTD equation.

-0.58700E-06

Page 20 · 6300 Series ComboSource User’s Manual

Menu

Description

Factory
Default
4.00000E-12

RTD C

The C term in the RTD equation.

RTD R0

The R0 term (in Ω) in the RTD equation.

100.00AD590 M

The slope term in the AD590 correction
equation.

1.00000

AD590 BThe offset term, in °C, in the AD590
correction equation.

0.000

LM335 M

The slope term in the LM335 correction
equation.

1.00000

LM335 BThe offset term, in °C, in the LM335
correction equation.

0.000

TEC Menu » AutoTune PID
See using the AutoTune Function later inthis manual for details on this item.
TEC Menu » Advanced
Invert ITE

Reverses the direction of the current

No

Off if Thi
LimTurns off the TEC output if the TEC exceeds thetemperature high limit

Yes

Off if Tlo
Lim

Turns off the TEC output if the TEC exceeds thetemperature low limit

Yes

Off if R Lim

Turns off the TEC output if the TEC exceeds thesensor limitNo

Off if ITE
LimTurns off the TEC output if the TEC hits the current
limit

No

Off if TE
Open

Turns off the TEC output if the TEC module
appears to be an open circuit

Yes

Off if Out
Tol

Turns off the TEC output if the TEC is out of
toleranceNo

Off if Sens
Open

Turns off the TEC output if the sensor appears to
be an open circuit

Yes

Off if Sens
Shrt

Turns off the TEC output if the sensor appears to
be a short circuit

Yes6300 Series ComboSource User’s Manual · Page 21

Menu

Description

Factory
Default

TEC Menu » Advanced » User Cal
Edit Cal

Must be set to ‘Yes’ before user calibration settings
can be changed.

No

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

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

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 serial or USB interfaces.

No

Msg Term

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

CR/LF

The Key A, Key B, Key C, and Key D settings
control the action assignment for the four function
keys available on the ComboSource. See Using
the Function Keys below for additional information.

NoneComm Menu

Function Menu
Key A
to
Key D
System Menu
ConfigAllows for restoring the instrument to defaults,
saving configurations, and restoring
configurations. See Saving and Restoring
Configurations below for more information.

No Change

Page 22 · 6300 Series ComboSource User’s Manual
Description

Factory
Default

Display

Display mode, which is used to control the layout
on the main screen. Normal will display more
information in a smaller font, while Large will
display the actual values only in a larger font.
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

Menu

Saving and Restoring Configurations
Using the Main Menu » System Menu » Config menu item, or the *SAV and*RCL commands over the computer interfaces, ComboSource allows you tosave up to four configurations. Each configuration will store all of the instrument
settings (except scripts and the function key definitions), and allow you toquickly 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 and6300 Series ComboSource User’s Manual · Page 23

configurations 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
and TEC User Cal menus, or manually adjust each user calibration entry to 1 (forslope) or 0 (for offset). See Field Calibration, below, for more details.

Using the Function Keys
The ComboSource offers a unique capability: the ability to assign functions tofront panel keys, allowing powerful configuration abilities at the touch of abutton. There are two programmable function buttons, which can be assigned
both a primary and secondary (or shifted) function.
The function keys can be assigned either of the following actions:••

Run a script
Load a stored configuration

Running a script
The most powerful capability of the function keys is the ability to executecommand strings, or scripts. These scripts are made up of commands, as
defined in the Computer Interfacing Manual, and can effect virtually the entire
operation of the instrument. Any command (except DELAY or *WAI commands)
can be used to construct a script, allowing you to configure the instrument,change modes, change set points, turn outputs on or off, or any other of a wide
range of actions. Script creation much be done over the computer interface, see
the Computer Interfacing Manual for more information on how to construct andstore scripts.
Loading a previously stored configuration
Using the Main Menu » System Menu » Config menu item, or the *SAVcommand over the computer interface, up to four different configurations can besaved to memory, and can then be assigned as a recall function. For example,
consider an application where different laser and/or temperature set points areused. By saving the different configurations, you can then assign the recall of theconfigurations to a function key, allowing you to switch between different setups
or set points with a single button press.
Prior to configuring the function keys, you need to create your configurations or
scripts. Configurations are easy: simply setup the instrument the way you want,then go to Main Menu » System Menu » Config to store the configuration into
one of the four configuration bins. Repeat the process for each setup you want torecall.

Page 24 · 6300 Series ComboSource User’s Manual

Scripts are a bit more difficult, as you need to create them using the computerinterface. See the Computer Interfacing Manual for more information on how toconstruct and store scripts.
Once your configurations and scripts have been created, go to Main Menu »Func Key Menu » Key A and assign a recall configuration or execute script
function. You will only be allowed to select the scripts and configurations you
have created.

--- Function Menu «Return to Main
Menu
Key A= Recall Cfg 1
Key B=
None
Func Key Menu
Once actions have been assigned to keys, return to the main screen. There two
two physical keys for four buttons: the primary A and secondary C actions bothuse the same A / C button, and likewise, the primary B and secondary D actions
both use the same B / D button.
To initiate the action assigned to the A or B keys, press and hold the A or B key
until the instrument does a double beep (approximately one second). This
indicates the action has executed. Executing the C or D actions requires twopresses of the Function button: once to select the function summary screen(with A and B actions highlighted), and a second time to change the highlight to
the C and D actions. You can then press the C or D button to start thecorresponding action.

Key A: Recall Cfg 1
Key B: Recall Cfg 2
Key C: Exec Script
1
Key D: None
Function Summary Screen
The function key assignments are not part of a saved configuration, and willremain unchanged when a recall configuration is done.

6300 Series ComboSource User’s Manual · Page 25

Connecting to the ComboSource
A laser diode is very sensitive to electro-static discharge (ESD), over-voltage,
and over-current conditions. When connecting a laser to the ComboSource,
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 ComboSource’s hardware protection features can only protect the laser
diode if these limits 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 ComboSource 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.
A cable is required for both the TEC and Laser outputs. 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 theconnection into a custom mount or device:
Function
Laser
TEC
TEC w/ remote sense

DB to DB p/n
1220B
1260B
1262B

DB to Pigtail p/n
1221B
1261B
1263B

The 1262B or 1263B cables are only needed if you will be operating theComboSource with an RTD sensor and using the 4-wire sensor connection.
Otherwise, the 1260B or 1261B cables are sufficient.

Page 26 · 6300 Series ComboSource User’s Manual

NOTE
Connections to the ComboSource and the fixture must
be secure. Tighten any screws on the DB connectors,
and make sure all connections are in good condition.

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

Power and Cable Connections

ComboSource 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
LASER Output Connector (DB-9 Female)6300 Series ComboSource User’s Manual · Page 27

Arroyo Instruments has followed industry conventions for laser DB-9
connections, and is compatible with pin-outs from other vendors, such as ILX
and Newport. However, care should still be taken when interfacing theComboSource to other vendors’ products, and if you have any questions,please contact your distributor or the factory.
Modulation Input
The modulation input BNC on the front panel accepts a 0V to 10V input signal
for analog set point control of the driver. The modulation input is opticallyisolated from the rest of the control circuits in the ComboSource and electricallyisolated from ground, so you should not need to be concerned about groundinterference from any modulation source. The center pin is positive and the outershell is ground.
TEC Output Connector
The TEC Output connection is a female DB-15, and has the following pin-out:
DB-15 Pin
Description
1, 2, & 9
TE (+)
3, 4, & 10
TE (-)
5&6
Earth Ground7
Sensor+8
Sensor –
11
Fan+
12
Fan –
13
Reserved (no connect)
14
Remote Sensor+
15
Remote Sensor –TEC Output Connector (DB-15 Female)
Using Remote Sensor
The remote sensor pins (pins 14 & 15) are used in RTD 4-wire mode, andprovide a remote measurement of the RTD voltage to eliminate voltage
measurement errors. See Working With RTDs below for more information. Do notconnect these pins to the TE+ or TE– pins, as damage may result.
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.

Page 28 · 6300 Series ComboSource User’s Manual

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.

Grounding Considerations
A key feature of the ComboSource is the optical isolation of both thephotodiode and modulation inputs. By isolating these inputs, earth grounding of
the photodiode anode or cathode, or earth grounding the modulation input,
cannot cause a ground loop through the instrument. Likewise, the laser anodeand cathode connections are also isolated from earth ground.
However, if you use the earth ground pin of the Output connector, it is possible
to create a ground loop if the instrument’s earth ground is connected to a fixture
or optical table that is also earth grounded. Make sure that from your laser diodepackage there is only a single path to earth ground.

Remote Mode Operation“Remote mode” operation is when the ComboSource is being controlled by acomputer over the USB or RS232 interfaces. When in remote mode, theComboSource behaves differently, preventing you from affecting the operationof 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, unless it
has been explicitly enabled by the Set While Rmt setting in the Comm Menu.
You can exit remote mode at any time by pressing the Menu button, which has
a secondary function to return the ComboSource to local operation.

6300 Series ComboSource User’s Manual · Page 29

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 ComboSource can be found in theComputer Interfacing Manual which is included on the CD that accompanied
this product.

Installing the USB Drivers
Using the ComboSource 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
ComboSource 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 a USB Serial Port is the ComboSource. In the event you have multiple
Arroyo Instruments products plugged in simultaneously, you will need toexperiment to see which instrument was assigned to which port. For example,
you could send a *IDN? query and see which instrument goes into remote
mode.

Thermal Considerations
The ComboSource is designed to provide high power in a small enclosure.
Both the laser and TEC sections of the ComboSource can be thermallyoverloaded if operated at high currents with a low voltage, and each section
handles the thermal overload condition differently.
For the TEC section, the ComboSource will automatically protect itself by
lowering the TEC current until it is no longer in an overload condition. While thismay lower the deliverable power to your TEC, it will prevent any damage to the
ComboSource. One exception to this is if you are operating in ITE (or constantcurrent) mode. In this morn, because you are specifying a specific drive current
for the TEC, if there is a thermal overload condition, the output will be turned off
and an E-438 error message will be generated.
For the laser section, the driver will always respond by turning the output off andgenerating an E-537 error message in an overload condition. A possible fix tothis condition is lowering the Vf Limit setting in the menu (in the Laser Menu) toPage 30 · 6300 Series ComboSource User’s Manual

just above the highest voltage needed for the maximum set point you will beusing. This gives the unit a “hint” as to the required voltage, and may be enoughto eliminate the thermal trip error.
If your instrument still continues to thermally trip, you can add a series resistor(to the laser or TEC, as appropriate) to remove some of the power from insidethe unit. Typically, a 30W 1Ω load resistor in series with the output is sufficient,but higher resistances and or power handling may be needed, depending on
the voltage and current configuration of your ComboSource. Please feel free tocontact the factory for more information and support.
Below is a graph that illustrates the minimum voltage requirements for the TEC
section of all ComboSource controllers:

6300 Series ComboSource User’s Manual · Page 31

The 6340-QCL ComboSource also has the following minimum voltage
requirements for the laser output:
Safe Operating Range for Laser Output of a 6340-QCL ComboSource
15

Example:14

At 3.41A, the minimum voltage at the laser connector must
be greater than ~7V. Anything less, and the instrument
will shut down the laser output.

13
12
11

Voltage (Volts)

10

Operating Zone9

Any combination of current andvoltage that lies outside the red
shaded area is acceptable.

8
7
6
5
4
3

Non-Operating Zone2

Laser output will be shut off
if operating in the red zone.

1
0
1.63

1.93

2.22

2.52

2.81

Current (Amps)

3.11

3.41

3.70

4.00

Page 32 · 6300 Series ComboSource User’s Manual

Using the Laser Driver
Laser Control Modes
The ComboSource offers the following 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 Laser 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 ComboSource 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.
Im mode (also referred to as AMC, or automatic monitor photodiode controlmode) is used to control the laser diode using the monitor diode feedback. You
select the target monitor diode current, and the ComboSource 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 front panel of the instrument. Modulation rates vary by model, so see
your model’s specification for the maximum modulation rates. Only Io HiBW

6300 Series ComboSource User’s Manual · Page 33

mode supports high speed modulation. All other modes of operation have amodulation bandwidth of 10Hz or less.
Current Range
The ComboSource offers two current ranges: a high range, which is the
maximum rated current for the driver (e.g., 500mA on a 6305) and low range,
which is one-half the maximum rated current for the driver (e.g., 250mA on a6305). The lower range offers improved accuracy (in Io (ACC) and Io HiBW
modes) and improved stability in all modes.

Using the Laser 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 ComboSource 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.

Analog Modulation
The analog modulation input BNC on the front of the instrument allows forexternal 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 andRange setting. For example, a 6305 operating in the 500mA range will attemptPage 34 · 6300 Series ComboSource User’s Manual

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 6305
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
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.
Current (A)1 or less2
4

Recommend Wire Gauge
24 AWG
22 AWG
20 AWG

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
measurement ares not required, and the error can be ignored. However, if
accurate voltage measurements are required, the ComboSource 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 the most accurate method. Details on both are found below.

6300 Series ComboSource User’s Manual · Page 35

Using Remote Voltage Sense
The ComboSource supports remote (4-wire type) voltage measurement of thelaser diode, providing a higher accuracy voltage measurement by directly
measuring voltage at the diode itself. While the Cable R setting described below
can provide 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
ComboSource, using a 4-wire connection:
LDA Voltage Sense
LDA

6300

LDA
LDA 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 theconnector 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 Laser
Output DB-9 to the laser cathode, and pin 8 to the laser anode, then in themenu, set Vf Sense to Remote. Indicated voltage will now be the remote diodevoltage.
When using remote voltage sense, any Cable R setting is ignored.
Using the ‘Cable R’ Setting

Page 36 · 6300 Series ComboSource User’s Manual

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 Laser Output connector, then the difference between themeasured 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 does not require a DMM and can be done with just the
ComboSource, 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 ComboSource. The resistance is found using a simpler versionof the formula above:

Cable R =Vf
I AMPS

6300 Series ComboSource User’s Manual · Page 37

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 ComboSource 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.

Page 38 · 6300 Series ComboSource User’s Manual

Using the Temperature Controller
TEC Control Modes
The ComboSource offers three TEC control modes: constant temperature mode
(T Mode), and constant resistance mode (R Mode), and constant current mode
(Ite Mode).
Changing the control mode is done through the TEC menu by changing theMode parameter to T Mode, R Mode, or Ite Mode.
Constant temperature mode uses the sensor constants to calculate theresistance of the thermistor at the desired or actual temperature.
While most users will only need the temperature control mode, the constantresistance mode allows you to bypass the sensor equation and directly selectthe sensor set point. This can be useful when only the desired sensor value isknown, or when the sensor-to-temperature conversion values are not available
for your sensor.

Using the TEC Limits
All TEC limits are implemented in software, but due to the relatively slow natureof the TEC, software is typically adequate.
Both high and low temperature limits are available, and will turn the TEC output
off unless this has been disabled (see Using Advanced Settings or
TEC:ENABLE:OUTOFF command).
Likewise, the sensor limits define an upper and lower limit for the sensor, but
unlike the temperature limits, the sensor limits will not turn the output off unlessspecifically enabled in the Advanced Settings menu or via the
TEC:ENABLE:OUTOFF command.

Selecting the Fixture
The ComboSource has integrated support for many of the mounts offered by
Arroyo Instruments, such as the 205 TEC Butterfly LaserMount. To simplify
operation when using these mounts, you can change the Mount setting in themenu to the mount type you are using. By selecting a mount, the current limit,
temperature limits, default gain, and sensor settings are automatically adjusted
to values appropriate to the mount, and menu settings limited to the capabilities

6300 Series ComboSource User’s Manual · Page 39of the mount. For example, when the 205 is selected, the Sensor setting is
hidden from the menu, and the current limit is adjusted to the mount’s rated limit
to prevent damage to the mount’s Peltier cooler.
Adjusting the Mount setting to User Defined removes all software limits, allowing
unrestricted operation of the ComboSource.

Working With Thermistors
The ComboSource is designed to work with negative temperature coefficient(NTC) thermistors, such as the BetaTHERM 10K3A1 thermistor used in theLaserMounts. A thermistor works by translating temperature into resistance,with resistance decreasing as temperature increases (hence the ‘negative
coefficient’).
Here is a typical response curve of a thermistor:

50000

Resistance (Ω)

40000

30000

20000

10000

0
-10.00

10.00

30.00

50.00

70.00

90.00

110.00Temperature (°C)

Typical Resistance vs. Temperature Graph
As can be seen be the graph, the resistance of the thermistor drops very quickly.
In the typical control range (0°C to 40°C), typical 10K thermistors offer goodsensitivity to changes in temperature, and this is the range in which most 10K
thermistors are typically used. 10K thermistors can be used at much higher
temperatures, but will suffer poorer temperature stability performance becauseof the lower sensitivity. When evaluating the performance of a thermistor, it isimportant to understand the resistance sensitivity of the thermistor at your

Page 40 · 6300 Series ComboSource User’s Manualapplication temperature, which varies greatly by temperature and thermistor
types.
The ComboSource supports operation using a 10μA or 100μA constant current
source, which limits the upper control range to 450kΩ or 45kΩ, respectively. To
minimize noise and maximize stability, you should select highest current whilestill allowing you full operation across your required temperature range. The
typical setting is 100μA, but your application will determine the actual needs.
The Steinhart-Hart Equation
As can be seen from the temperature versus resistance graph above, resistancevaries inversely with temperature in a non-linear fashion. This relationship can be
accurately modeled by polynomial equations, and one such being the SteinhartHart equation:

1= A + B * ln( R) + C * ln( R)3T
The coefficients A, B, and C can usually be obtained from the thermistor
manufacturer. The ComboSource defaults to the coefficients for the
BetaTHERM 10K3A1 thermistor (A = 1.12924x10-3, B = 2.34108x10-4, C =0.87755x10-7). You can change the coefficients under the Sensor Coeffs menu.

Working With RTDs
Like thermistors, RTDs also function by converting temperature into resistance,
but unlike thermistors, RTDs increase in resistance as temperature increases.
RTDs are also a fairly linear device, meaning they can be used across a muchbroader temperature control range.
According to IEC751, the resistance/temperature relationship is determinedusing one of two equations, dependent on the temperature or resistance value
being measured. For resistances above the R0 value (resistance at 0°C, typically100Ω) of the RTD, the following equation is used:

R = R0 (1 + AT + BT 2 )Below R0, an additional term is added to the equation:

R = R0 [1 + AT + BT 2 + C (T − 100)T 3 ]6300 Series ComboSource User’s Manual · Page 41

In both of these equations, R0 is the resistance of the RTD at 0°C, and A, B, andC are the coefficients as defined by IEC751, through regression analysis, or byusing the Callendar-van Dusen method. By default, the ComboSource uses theLaboratory standard coefficients for 100Ω RTD, which are for a 0.003926Ω/ Ω/°C
curve (A = 3.9848x10-3, B = -0.58700x10-6, C = 4.0000x10-12, and R0 = 100).
The ComboSource automatically determines which equation to use based on
the conditions at the time of the measurement.
2-Wire versus 4-Wire Measurements
One concern in using RTDs, particularly 100Ω RTDs, are their relatively low
resistance (typically 100Ω at 0°C), and small Ω/°C. Because of these two factors,
the resistance of the cable used to connect to the sensor can become asignificant error in the sensor measurement. The ComboSource offers two RTD
measurement modes: a conventional two wire measurement mode, which is
subject to this error, and a four wire measurement mode that uses separate
sensor and source lines to remotely sense the actual resistance of the RTD andeliminate the cable or connector resistances.
When using 4-wire measurement mode, you must select ‘RTD (4-wire)’ as thesensor type, and then connect the Sensor+ and Remote Sensor+ at one side of
the RTD, and Sensor– and Remote Sensor– to the other side of the RTD. Make
these connections as close to the sensor as possible.
The drawings below illustrate how 2-wire and 4-wire connections work. Note that
4-wire measurements require all four wires to be brought through the cable tothe mount. The 1262 and 1263 cables carry this connection through to themount, but the 1260 and 1261 cables do not.

6300

Sensor+

Mount
RTD
SensorSensor–RTD 2-wire Measurement

6300

Sensor+Remote Sensor+
Remote Sensor–
Sensor–

RTD 4-wire Measurement

Mount
RTD
Sensor

Page 42 · 6300 Series ComboSource User’s Manual

Working With AD590s and LM335s
Unlike thermistors and RTDs, an AD590 or LM335 is considered an “IC” sensor
because it has an active transistor element that responds to changes intemperature by producing a current (AD590) or voltage (LM335).
Also unlike thermistors and RTDs, these IC sensors produce a linear response,
making conversion to temperature a very straightforward calculation.
AD590 sensors produce 1µA/K, so that 0°C (which is equal to 273.15K) would
produce 273.15 µA.
Similarly, LM335 sensors produce 10mV/K, so that 0°C would produce 2.7315V.
For both sensors, because the response is linear, the sensor coefficients default
to a slope of 1 and an offset of zero, but can be adjusted to achieve higher
accuracy.
The temperature correction formula for the AD590 or LM335 is:
T = MTC + B
Where TC is the temperature (in °C) calculated using the standard conversion
value of 1°C/µA or 0.1°C/mV, as appropriate, and adjusted from Kelvin to
Celsius.

External Fan Control
The ComboSource has a built-in user adjustable 4-12V DC power supply
designed to provide up to 350mA to an external fan, such as those built into the
240 Series LaserMounts. When using the ComboSource with mounts that
require a fan, no additional external power supply is needed, however, the cablemust include the wiring needed for the fan. The 1260B, 1261B, 1262, and 1263
cables include the wiring.
Fan control is setup in the menu using the Ext Fan, Ext Fan Pwr, Ext FanMode, and Ext Fan Off settings.
Ext Fan can be set to Off, Slow, Medium, Fast, or Custom. When set to Off, thefan power is never turned on. Slow, Medium, and Fast correspond to 9V, 10.5V,
and 12V. To select a different voltage, choose the Custom setting and thenadjust the Ext Fan Pwr menu item to the desired voltage, from 4.0V to 12.0V.
The fan on/off mode can be controlled using the Ext Fan Mode setting. There
are five modes:

6300 Series ComboSource User’s Manual · Page 43

Auto
On
Delay
Cool
Heat

Fan is turned on whenever the TEC output is on, and turns off when the
TEC output is turned off.
Fan is always on.
Similar to the Auto mode, the fan is turned on whenever the TEC output
is on, but when the TEC is turned off, the fan will remaining running foran addition number of minutes as defined by the Ext Fan Off setting.
Fan is turned on whenever the TEC output is on and cooling, offotherwise.
Fan is turned on whenever the TEC output is on and heating, offotherwise.

Resistive Heaters and Heat/Cool Only Modes
The ComboSource supports temperature control using resistive heaters insteadof Peltier coolers. With resistive heaters, cooling is obviously not possible, andthe ComboSource must be configured to not attempt to cool the output, or a
run-away condition will occur when the cooling current actually causes
additional heating.
If your application requires, you can also configure the ComboSource tooperate in a cool-only mode. This is only possible with Peltier coolers, as
resistive heaters will heat regardless of the direction of current.
To change the cooling mode, adjust the H/C Mode setting to Heat/Cool, Heat
Only, or Cool Only, as appropriate.

Gain Control and the PID Loop
The ComboSource supports a fully configurable PID loop, allowing fullcustomization of the PID control parameters. To simplify control, eight standard
gain settings are also defined, and many applications can achieve acceptableperformance with these predefined gain settings, eliminating the need tounderstand and adjust the PID loop.
The predefined gains are numbered 1 through 300, and set using the Gainmenu setting. Increasing the gain value will increase the speed of the control
loop. For full access to the PID parameters, change the Gain setting to PID, andthe individual P, I, and D values will be available as settings in the menu.
The PID parameters function within a mathematical formula as described below:

Output = P *  + I *  dt + D *ddtPage 44 · 6300 Series ComboSource User’s Manual

Where  is the error in the system, expressed as: = Target - Actual
The controller can calculate ideal PID values using the AutoTune function,
discussed in detail in the next section.
To manually adjust the PID, start by changing the I and D values to zero, andadjust the P value so that it reaches the set point as quickly as possible without
overshooting the set point an unacceptable amount. Gradually increase the Ivalue until the set point is achieved without oscillation. In many systems, the Dterm is not needed and may be left at zero.
For additional information on PID loop tuning, consult online resources such as
Wikipedia (http://en.wikipedia.org/wiki/PID_controller) or search for terms suchas “Ziegler-Nichols method”, or “PID Loop”.

Using the AutoTune Function
The ComboSource is capable of automatically determining PID parameters formost applications. Using a form of the Ziegler-Nichols method, theComboSource will step through a process to determine the thermal response of
the mount, which can then be used in a mathematical model to calculate the PID
parameters.
The PID parameters generated by AutoTune are not necessarily the ideal PID
parameters, and small improvements may be possible by further refining theresults manually.
Before starting the AutoTune function, it is best to begin from ambientconditions, either with the TEC off and the mount stabilized at ambient, or the
TEC on and the set point around 25°C. While this is not required, it can produce
better results. AutoTune only functions in temperature mode. PID parametersmust be manually determined for R mode.
Make sure the current and temperature limits are set prior to starting AutoTune.
AutoTune will intentionally cause your mount to oscillate, so the temperature
limit should be at least 5 to 10 degrees away from the test point to avoid tripping
a limit during the process.
To start the AutoTune function, select the AutoTune PID menu entry from the
TEC menu and press ENTER. If you wish to perform AutoTune remotely, see thefollowing section for more information.

6300 Series ComboSource User’s Manual · Page 45

The instrument displays the AutoTune test point. Use the knob to adjust the test
point to your typical operating point. If you will be operating at two or more set
points, you will usually want to select the set point furthest away from ambient.
Once the temperature test point is selected, press ENTER.
The instrument asks for a final confirmation to start the AutoTune process. Press
ENTER to start, or MENU to exit.
Once the AutoTune process starts, the display will indicate the present
temperature, which step it is performing, and the word “AutoTune” will flash on
the display.
The typical temperature profile of an AutoTune process is shown in the graphbelow. The first step, which is the calculation of the P and D parameters,
completes at around 68 seconds, then the mount is allowed to stabilize with the
new P and D parameters,. Then the second step begins, which is thedetermination of the I term. This completes around 200 seconds into the test,
and then the output stabilizes with the calculated set of PID parameters for theremaining portion of the graph.

Once the AutoTune process is complete, the output will remain on and thedisplay will show “AutoTune Successful”. The three PID parameters will also be
displayed. The Gain setting will be changed to PID.

Page 46 · 6300 Series ComboSource User’s Manual

If the AutoTune process fails, the instrument will display an E-436 AutoTune
Failed error message and turn the output off. Any of the following can cause the
AutoTune to fail:•••Noisy temperature measurements, which make it difficult to accurately
measure oscillations
Any condition that causes the output to turn off (temperature limits,
sensor limits, etc.)
Systems with very low P or I terms

In the Auto-Tune fails due to thermal system limitations, you will need tomanually modify the PID parameters as described in the section above or selectfactory gain setting.
You can turn the output off at any time to cancel the AutoTune process, and the
PID parameters will remain unchanged (an E-436 will also be displayed).

Using the AutoTune Function Remotely
The AutoTune function can be done remotely, and works essentially the same as
local operation. The TEC:AUTOTUNE command starts the process, and requires
one parameter, which is the AutoTune temperature test point.
The command will immediately put the instrument into AutoTune mode, and thedisplay will indicate progress in the same way as local operation. The
TEC:AUTOTUNE? query can be used to monitor the process of AutoTune. A
response of 1 indicates AutoTune is in progress. Once complete, the instrument
will respond with a 2 if AutoTune failed or a 3 if AutoTune succeeded. A
response of 0 is returned if the instrument has never started an AutoTune
process.
Turning the output off remotely will cancel the AutoTune process and generate
an E-436 error.
More details on the use of the command can be found in the Computer
Interfacing Manual.

6300 Series ComboSource User’s Manual · Page 47

Compensating for TEC Cable Resistance
Because the high currents the ComboSource can drive through the Peltier, thevoltage loss through the cable and connectors of the system can significantly
affect the TEC voltage measurement. In most cases, accurate voltage
measurements are not needed, and the default compensation of the instrument
is sufficient. To improve the compensation, the Cable R setting in the menu
allows you to specify the cable resistance, which is then used to dynamicallysubtract the voltage drop by simply using the formula V = I * R to calculate thevoltage loss, where I is the TEC ITE current, and R is the Cable R setting. Thisvalue is then removed from the voltage measurement to display an accurate
TEC voltage measurement.
The safest method of calculating cable resistance is to short the ITE+ and ITE–
connections, making sure whatever you are using to short the terminals is notitself adding resistance to the circuit. Use short, heavy gauge wires, preferably
soldered onto the terminals to minimize any resistance the short might add.
Place the short as close to the Peltier as is reasonable. A simple approach is to
unplug the cable from the mount and place a shorting plug on the mount end of
the cable, which is easily made from a male DB15 connector and a soldering
iron to solder the ITE+ and ITE– pins together. Make sure the Peltier isdisconnected to protect it from current overloading during the test.
Change the instrument to ITE mode and set the current to 5A. Depending on
your setup, you may first need to change the Mount to User Defined and adjust
the limit to 5A. Turn on the output and after the voltage has stabilize, make anote of it and turn the output off. Enter the measured voltage into the following
equation to calculate Cable R:
Cable R = Voltage / 5
Enter the resulting values into the Cable R menu entry and return the instrument
to its original configuration. Typical values for Cable R are 0.008 to 0.040, but
depend on your actual configuration.

Page 48 · 6300 Series ComboSource User’s Manual

Field Calibration (User Cal)The ComboSource is typically calibrated annually, and calibration can be done
one of two ways: the instrument can be returned to the factory for a fullrecalibration, 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 menus, or via
the LASER:USERCAL or TEC:USERCAL commands over the computerinterface.
For calibration of the instrument from the front panel, the User Cal menu islocated under the Advanced menu of either the Laser to TEC menus. From
there, you can view the various calibration entries, but editing can only be doneby changing Edit Cal to Yes. Once enabled, the calibration entries can be
adjusted just like any other menu setting. You can also reset the user calibration
data for all elements by changing the Reset Cal to Yes.
For each set point or measurement, there is a corresponding slope and offset
calibration:

6300 Series ComboSource User’s Manual · Page 49

Laser User Calibration Entries
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)TEC User Calibration Entries
Menu Entry
ITE Set M
ITE Set B
ITE M
ITE B
VTE M
VTE B
Th 10µA M
Th 10µA B
Th 100µA M
Th 100µA B
LM335 M
LM335 B
AD950 M
AD590 B
RTD M
RTD B
RTD4 M
RTD4 B
1K RTD M
1K RTD B
1K RTD4 M
1K RTD4 B

Description
ITE set point, slope
ITE set point, offset (A)ITE measurement, slope
ITE measurement, offset (A)VTE measurement, slope
VTE measurement, offset (V)10µA Thermistor measurement, slope
10µA Thermistor measurement, offset (kΩ)
100µA Thermistor measurement, slope
100µA Thermistor measurement, offset (kΩ)
LM335 measurement, slope
LM335 measurement, offset (mV)
AD590 measurement, slope
AD590 measurement, offset (µA)
100Ω RTD measurement, slope100Ω RTD measurement, offset (Ω)
100Ω RTD 4-wire measurement, slope100Ω RTD 4-wire measurement, offset (Ω)
1kΩ RTD measurement, slope
1kΩ RTD measurement, offset (Ω)
1kΩ RTD 4-wire measurement, slope
1kΩ RTD 4-wire measurement, offset (Ω)

When the slope is 1 and the offset is zero, this is considered an“uncompensated” measurement. If you change either the slope or offset, thePage 50 · 6300 Series ComboSource User’s Manual

value 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 a similar version of the equation above 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 laser drive current at 300mA,
and you are using a 6305 in high range. You set the instrument at 300mA,
observe that the actual current is 298.6mA and the current measured by the 6305
is 301.2mA.
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
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. Thisaddresses a downside of single point offset calibration where it can cause theinstrument to no longer be in calibration at points away from the single
calibration point. To keep the math simple in our example, we will only do a two
point calibration, but a higher number of points are possible, and the slope canbe calculated using a least-squares-fit algorithm (offset calculation is the same ineither 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 the6305:

6300 Series ComboSource User’s Manual · Page 51

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
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.

Page 52 · 6300 Series ComboSource User’s Manual

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.
Considerations for Calibrating the TEC Sensors
For calibration of resistance sensors (thermistor and RTD), it is best to use aselection of precisely measured fixed resistors, then connect them to the sensor
input on the instrument.
For LM335, the sensor is biased with a 1mA current source, so using anappropriately ranged fixed resistor (2kΩ to 4kΩ) will generate a voltage in theoperating range of the sensor which can be measured by your meter.
For AD590 calibration, the sensor is biased with a ~4.5V source. Like theLM335, you can use a precisely known fixed resistor to create a known amountof current flowing through the sensor. By using the I = V / R calculation, you candetermine the amount of current flowing through the resistor by measuring thevoltage across the resistor.

6300 Series ComboSource User’s Manual · Page 53

Specifications
Description
LASER
SETPOINTLASER CURRENT
Range (mA)
Max 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 (kHz)MEASUREMENTLASER CURRENT
Resolution (mA)
Accuracy (±[% set+mA])
LASER VOLTAGE
Resolution (V)Accuracy (±[% read+V])
PHOTODIODE CURRENT
Resolution (μA)
Accuracy (±[% read+μA])
LIMITSLASER CURRENT
Resolution (mA)
Accuracy (±mA)
LASER VOLTAGE
Resolution (V)Accuracy (±% FS)

6301

Laser Specifications
6305
6310

6340

Low
Range

High
Range

Low
Range

High
Range

Low
Range

High
Range

Low
Range

High
Range

50
0.002

100
0.005

250
0.01

500
0.02

500
0.02

1000
0.05

2000
0.1

4000
0.2

0.025%+ 0.020.025%+ 0.030.025% 0.025% 0.025%+ 0.08 + 0.12 + 0.12

0.025%+ 0.3

0.025%
+ 0.5

0.05%
+ 0.8

<1

< 10, 1 hour50
< 1.5 < 1.5

< 2.5

< 35

< 40

<1

< 1.2

10

10

10

4

2 – 5,000
0.1
0.05% + 1
< 200, 24 hours< 200
0 to -5V, programmable0 – 100 – 100 – 100.001
0.05% + 0.005< 50, 1 hour
< 100

0–4

0 – 10V, 10kΩ
325
200

325

0.02

150

0.002

0.005

0.01

0.02

0.05

0.1

0.2

0.025%+ 0.020.025%+ 0.030.025% 0.025% 0.025%+ 0.08 + 0.12 + 0.12

0.025%+ 0.3

0.025%
+ 0.5

0.05%
+ 0.8

0.001
0.05% + 0.005
0.1
0.05% + 0.5

1
2

5

10
0.1
2.5%

40

Page 54 · 6300 Series ComboSource User’s Manual

Description
LASER
SETPOINTLASER CURRENT
Range (mA)
Max 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 (kHz)MEASUREMENTLASER CURRENT
Resolution (mA)
Accuracy (±[% set+mA])
LASER VOLTAGE
Resolution (V)Accuracy (±[% read+V])
PHOTODIODE CURRENT
Resolution (μA)
Accuracy (±[% read+μA])
LIMITSLASER CURRENT
Resolution (mA)
Accuracy (±mA)
LASER VOLTAGE
Resolution (V)Accuracy (±% FS)

Laser Specifications
6310-QCL 6340-QCL
Low
Range

High
Range

Low
Range

High
Range

500
0.02

1000
0.05

2000
0.1

4000
0.2

0.025%+ 0.120.025%+ 0.3

0.025%
+ 0.5

0.05%
+ 0.8

< 1.5

< 10, 1 hour50
< 2.5 < 35

< 40

18

15

2 – 5,000
0.1
0.05% + 1
< 200, 24 hours< 200
0 to -5V, programmable0 – 180 – 150.001
0.05% + 0.005< 50, 1 hour< 100

0 – 10V, 10kΩ
200
150

0.02

0.05

0.1

0.2

0.025%+ 0.120.025%+ 0.3

0.025%
+ 0.5

0.05%
+ 0.8

0.001
0.05% + 0.005
0.1
0.05% + 0.5

1
10

40
0.1
2.5%

6300 Series ComboSource User’s Manual · Page 55

Description
TEC
SETPOINTTEMPERATURE
Range (ºC)1
Resolution (ºC)
Therm Accuracy (± ºC) 2
AD560 Accuracy (± ºC)2
LM335 Accuracy (± ºC) 2100Ω RTD Accuracy (± ºC) 2
1kΩ RTD Accuracy (± ºC) 2
Stability (1hr) (± ºC)4
Stability (24hr) (± ºC)4
CURRENT
Range (A)Compliance Voltage (V)Max Power (W)Resolution (A)Accuracy (±[% set+mA])
Noise/Ripple (mA, rms)
MEASUREMENTCURRENT
Resolution (mA)
Accuracy (±[% read+mA])
VOLTAGE
Resolution (mV)
Accuracy (±[% read V])
10µA THERMISTOR
Range (kΩ)
Resolution (kΩ)
Accuracy (±[% read+kΩ])
100µA THERMISTOR
Range (kΩ)
Resolution (kΩ)
Accuracy (±[% read+kΩ])LM335
Bias (mA)
Range (mV)Resolution (mV)
Accuracy (±[% read+mV])
AD590
Bias (V)
Range (µA)
Resolution (µA)
Accuracy (±[% read+ µA])
100Ω RTD
Range (Ω)
Resolution (Ω)
Accuracy (±[% read+Ω])TEC & General Specifications-99 to 250
0.01
0.053
0.05
0.05
0.33
0.40
0.004
0.01
5
12
60
0.01
0 + 30<5

10
0 + 3010
0 + 0.05
0.2 – 4500.01
0.05 + 50
0.02 – 45
0.001
0.05 + 5
11730 – 4730
0.1
0.3 + 1
4.5
173 – 473
0.01
0.03 + 0.1
20 – 192
0.01
0.03 + 0.1

Software limits. Actual range dependent on sensor type and system dynamics
Accuracy figures are the additional error the 6300 adds to the measurement and does not include thesensor uncertainties.
3
25°C, 100µA thermistor
4
Stability measurements done at 25°C using a 10kΩ thermistor on the 100µA setting. The number is ½
the peak-to-peak deviation from the average over the measurement period.
1
2

Page 56 · 6300 Series ComboSource User’s Manual

Description
1kΩ RTD
Range (Ω)
Resolution (Ω)
Accuracy (±[% read+Ω])
LIMITS
CURRENT
Resolution (mA)
Accuracy (mA)
GENERAL
Display Type
Laser Connector
TEC Connector
Fan Supply
Computer Interface
Power (50/60 Hz)
Size (H x W x D) [inches(mm)]
Weight (lbs [kg])Operating Temperature
Storage Temperature

TEC & General Specifications
100 – 4500
0.1
0.05 + 110
40
2x20 VFD
DB-9, female
DB-15, female
4 – 12V, 350mA max
USB 2.0 Full Speed (Type B), RS-232 (DB-9, male)
100V / 120V / 230V, 150W
3.47 (89) x 8.5 (215) x 12 (305)
7.8 (3.5)+10°C to +40°C-20°C to +60°C

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-402

Sensor open, output
turned off
Module open, output
turned off
I limit, output turned off

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).
A sensor open circuit was detected and theoutput was turned off.
A Peltier module open circuit was detected andthe output was turned off.
A current limit was detected and the output was
turned off.
A voltage limit was detected and the output was
turned off.
The thermistor resistance limit (high or low) was
exceeded and the output was turned off.

E-403
E-404
E-405
E-406

V limit, output turned
off
Thermistor resistancelimit, output turned off

6300 Series ComboSource User’s Manual · Page 57
E-407

E-416

Temperature limit,
output turned off
Sensor changed,
output turned off
Temperature was outof tolerance, output
turned off
Sensor short, output
turned off
Cal failed

E-419

TEC not stable

E-433

Not a TEC

E-434

Ite limit exceeds cablerating

E-435

Mode Change

E-436

AutoTune failed

E-437

AutoTune in T mode
only

E-501

Interlock shutdown
outputE-504

Laser current limit
disabled output.

E-505

Laser voltage limit
disabled output
Laser photodiodecurrent limit disabled
output

E-409
E-410
E-415

E-506

E-507

Laser photodiodepower limit disabled
outputE-508

TEC off disabled
outputE-509

Laser short circuitdisabled output

The temperature limit (high or low) was
exceeded and the output was turned off.
The sensor type was changed, causing theoutput to be turned off.
The temperature went out of tolerance and theoutput was turned off.
A sensor short circuit was detected and theoutput was turned off.
An error occurred during calibration that caused
the calibration to fail. The unit is no longer incalibration mode.
The TEC is considered stable if the temperature
has changed less than 0.02°C for more than 20
seconds.
The TEC:CHAN command attempted to select a
non-TEC channel
The cable plugged into the unit is not rated tocarry the current as set by the current limit. Usea 1262 cable, 1263 cable, or custom cable with
ID pin connected to analog ground, or reducethe current limit below 5A.
A mode change occurred when the output wason, forcing the output off.
The AutoTune process failed. See the “Using the
AutoTune Function” for more information.
The AutoTune process is only available in T
(temperature) mode. In R mode, the PID
parameters must be determined manually.
The interlock input (pins 1 and 2 of the output
connector) were not shorted when the output
was on.
The laser output was turned off because acurrent limit was detected and thecorresponding bit in the OUTOFF register wasset.
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 the
TEC was off and the corresponding bit in the
OUTOFF register was set.
The laser output was turned off because a shortcondition was detected and the corresponding
bit in the OUTOFF register was set.

Page 58 · 6300 Series ComboSource User’s Manual
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
TEC temperature limit
disabled output

E-521

E-534
E-535
E-536

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

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 the
ComboSource while the output was on
shutdown the output.
The ComboSource 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.
The laser output was turned off because the
TEC temperature limit was exceeded
corresponding bit in the OUTOFF register wasset.
Attempted to select Po mode and PD Response
was zero, or ComboSource 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, theComboSource detected a significant difference
between the remote voltage and the voltage at
the connector, which may indicate a problem
with the remote voltage 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 ComboSource.
A non-specific error was encountered.

6300 Series ComboSource User’s Manual · Page 59

Maintenance and Service
Maintenance
The ComboSource 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, 2A, 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 ComboSource 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.

Page 60 · 6300 Series ComboSource User’s Manual

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.

6300 Series ComboSource User’s Manual · Page 61

EC Declaration of Conformity

EC Declaration of Conformity
I/Weof

declare that

Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA
USA
6300 Series ComboSource Laser Diode Controller

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 6300 Series
ComboSource Laser Diode Controller 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)(SIGNATURE OF AUTHORIZED PERSON)

President

June 1, 2011

(TITLE OF AUTHORIZED PERSON)(DATE OF ISSUE)

Page 62 · 6300 Series ComboSource User’s Manual

UK Declaration of Conformity

UK Declaration of Conformity

I/We
of

declare that

Arroyo Instruments
1201 Prospect Street
San Luis Obispo, CA 93401
USA
6300 Series ComboSource Laser Diode Controller

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 6300 Series
ComboSource Laser Diode Controller is Compliant to the above noted U.K. Legislation
and are 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)

6300 Series ComboSource User’s Manual · Page 63

NOTES:

Page 64 · 6300 Series ComboSource User’s Manual

Copyright © 2022, Arroyo Instruments. All Rights Reserved

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