OsTech Laser Lab Source LDC Series Operating Manual Download

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cmd

type

min

max

default

unit

description

GFD

float

1.2

default fan voltage

bool

external control stop/run

float

— no parameter —

◦

device temperature (head)

GVS

word

— no parameter —

software version

GVN

word

— no parameter —

serial number

9.3.1

Status

ommand

cmd

type

min

max

default

unit

description

word

— no parameter —

get status

The status bits have the following meanings:

0x0001

interlock OK

0x0004

driver supply OK

0x0400

sensor OK

0x0008

driver temperature OK

0x0800

sensor OK

0x0010

LTLU

not OK

0x0020

LTLL

not OK

0x2000

LTM

not OK

0x0040

CTLU

not OK

0x4000

0x0080

CTLL

not OK

0x8000

error

9.3.2

Mode

ommands

cmd

type

min

max

default

unit

description

word

— no parameter —

get mode

GMC

word

clear mode bit(s)

GMS

word

set mode bit(s)

GMT

word

toggle mode bit(s)

The mode bits have the following meanings:

0x0001

laser current ON

0x0100

first TEC (laser) ON

0x0002

input echo OFF

0x0200

second TEC (crystal) ON

0x0400

pilot laser ON

0x0008

binary mode

0x0800

laser current control (

LCC

) OFF

0x0010

laser voltage control OFF

0x1000

use external interface after startup

0x0020

LMDI

0x2000

LMDX

OFF

Summary of Contents for Laser Lab Source LDC Series

Page 1: ...Operating Manual LDI LDC and TEC Series Laser Diode Drivers and TEC Controllers...

Page 2: ......

Page 3: ...configuration operation and monitoring A USB interface is optionally available on all models Every LDC and TEC unit passes a burn in inspection a full functional test and a final calibration prior to...

Page 4: ...mosensor input for NTCs standard 10 k PT100 PT1000 or others Polynomial and Steinhart Hart sensor model PID temperature controller for TEC coolers Voltage current and temperature limits Target tempera...

Page 5: ...eypad 11 3 2 Display Menus 11 3 2 1 Main Menu 11 3 2 2 Laser Menu 12 3 2 3 TEC Menu 13 3 2 4 Device Menu 14 4 Hardware setup preparations 16 5 Laser control 17 5 1 Preparations 17 5 2 CW mode 17 5 2 1...

Page 6: ...rror codes 29 9 Command reference 30 9 1 Laser commands L 30 9 1 1 Laser current commands LC 30 9 1 2 Laser voltage commands LV 30 9 1 3 Laser photo current LPC and power LP commands 30 9 1 4 Laser mo...

Page 7: ...tions should be followed for safe operation and optimum performance of the laser diode In case of questions or problems please contact Laser Lab Source in North America or our service staff at OsTech...

Page 8: ...5 mm 85 mm 200 mm 4 1 in 3 3 in 7 9 in t95 housing 119 mm 95 mm 235 mm 4 7 in 3 7 in 9 3 in t127 housing 200 mm 127 mm 277 mm 7 9 in 5 0 in 10 9 in t192 housing 19 inch 2 HU 483 mm 89 mm 266 mm 19 in...

Page 9: ...o pulse accuracy 30 s rise time at 2 5 A Imax 2 s at 4 A Imax 3 s at 8 A Imax 10 s at 12 A Imax 15 s at 16 A Imax 18 s 16 A Imax 25 40 s on request 1 s 3 s fall time 70 100 of Trise laser fan control...

Page 10: ...5 2 5 4 8 10 12 16 A accuracy Imax 4000 peltier voltage max 4 8 14 18 24 48 V temperature controller range 25 C 150 C larger on request accuracy typical 10 mK max 100 mK temperature limits range 25 C...

Page 11: ...s shown on the display Some fields can be used to change settings of the device others only show the current values You can switch to the next menu with the arrow in the upper right corner The laser m...

Page 12: ...LTCA CTCA TEC current actual TVA TEC voltage actual TCL TEC current limit Error error number 0 no error Interlock if the interlock is closed a Laser driver without TEC controller b Laser driver with o...

Page 13: ...al digital modulation LMDI internal digital modulation LMW laser modulation width LMP laser modulation period PC pulse count LMDIC command PC 1 single pulse PC 2 burst of 2 pulses PC 0 continuous puls...

Page 14: ...igure 3 3d a TEC menu b Dialog PID Parameters c Dialog Select Sensor d Dialog Sensor Parameters Figure 3 3 TEC Menu and dialogs in it 3 2 4 Device Menu The device menu is shown in figure 3 4 This is w...

Page 15: ...GFD default fan voltage Restore Default Settings Reset all settings in the device to their default values Service Show type serial number and software version of the device Figure 3 4 Device menu 15...

Page 16: ...t Remove the shorting clip from the laser While turned off the laser output of the driver unit is internally shorted Connect the power supply unit to the proper supply voltage Make sure that the inter...

Page 17: ...see chapter 7 To do this use the commands LCL and LVC 5 2 CW Mode The mode of operation can be selected in the laser menu The CW mode is active by default when all of the modulation modes LMDI LMDX an...

Page 18: ...he maximum current set point for you laser diode The slope of the ramp will be LCTmax 2000 ms in this example During the laser stop ramp you can turn off the laser immediately by sending LS command ag...

Page 19: ...mits exact the target laser power An external power meter is necessary for this Now execute the LPF command to fix the actual photo current value to this laser power You can now you can get the laser...

Page 20: ...tinuously as you can see in figure 5 2 You have to enter the pulse width duration and pulse period in s Take care of the right proportions of these values The pulse width is in the range of 100 s 4 10...

Page 21: ...ansition at the modulation input occurs 5 4 2 External Digital Modulation The external digital modulation mode may be activated by entering the LMDX com mand If this mode is active and the laser is ru...

Page 22: ...t is 150 mA In OFF state the output is near 0 V level With PLR and PLS you can turn the pilot laser ON and OFF With the command PP n you may set the pulse width modulation value with a base frequency...

Page 23: ...ing them is the use of the letters L and C respectively 6 1 PID Controller Parameters The temperature controller in devices with TEC support has a PID structure with the common formulas Gc s kp 1 1 Tn...

Page 24: ...um value for response time and eliminate overshooting Note that you must stop and restart the temperature controller after changing those values to make sure that the controller is initialized with th...

Page 25: ...for a PT100 or PT1000 sensor can be calculated from its resistance using the following formulas R0 100 at 0 C R T R0 1 A T B T2 T temperature in C As B is commonly neglected you can calculate them usi...

Page 26: ...by adding the difference between the real temperature and the shown temperature to the absolute part xTSC0 If you need assistance in connecting your sensors or you want to assemble any other sensor to...

Page 27: ...ed after the CR but most terminals are able to generate this automatically You may invalidate any sequence by sending Esc Single characters may be deleted from the buffer by backspace Between commands...

Page 28: ...B checksum binary coded answer There are four data types with the following return structure float 4 bytes checksum short or word 2 bytes checksum string 0 255 bytes 0x00 boolean 1 byte 0xAA for run o...

Page 29: ...3 internal supply voltage not acceptable 4 laser temperature sensor open 5 crystal temperature sensor open 6 laser temperature exceeds upper limit 7 laser temperature lower than lower limit 8 laser s...

Page 30: ...rrent LCB float 0 Imax 0 mA base or bias current 9 1 2 Laser Coltage Commands LV cmd type min max default unit description LVA float no parameter V actual laser voltage LVC float 1 3 6 3 V compliance...

Page 31: ...default unit description LZTR float 300 34000 300 ms ramp time refers to Imax The following commands are optionally available on request cmd type min max default unit description LZR bool no paramete...

Page 32: ...0 0 C lower temperature Limit xTSCk float NTC B3980 sensor coefficients k 0 3 xTSM word 0 1 0 sensor approximation model 0 polynomial model 1 Steinhart Hart equation 9 2 2 TEC Commands cmd type min ma...

Page 33: ...er temperature OK 0x0800 CT sensor OK 0x0010 LTLU not OK 0x0020 LTLL not OK 0x2000 LTM not OK 0x0040 CTLU not OK 0x4000 LC ON 0x0080 CTLL not OK 0x8000 LC error 9 3 2 Mode Commands cmd type min max de...

Page 34: ...0x0040 LMDX ON 0x4000 gate option 0x0080 LMAX ON 0x8000 reduced mode 34...

Page 35: ......

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