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LCL

laser current limit

LVC

compliance voltage (

≥

LVA

)

LVA

laser voltage actual

LCB

laser current bias (for modulation)

LCLM

limit for average laser current (for modulation)

LTM

laser temperature maximum, laser stops above this temperature

Error#

error number (0 = no error)

CW Mode

no modulation

LMAX

external analog modulation

LMDX

external digital modulation

LMDI

internal digital modulation

LMW

laser modulation width

LMP

laser modulation period

pulse count (=

LMDIC

command)

•

1: single pulse

•

2: burst of 2 pulses . . .

•

0: continuous pulses

gate option

Figure

3.2:

Laser

3.2.3 TEC Menu

The TEC menu is shown in

figure 3.3a

. This is where the user can change TEC controller

settings. The following fields are included:

TEC Contr. On

switch the TEC controller on and off

target temperature

temperature actual

TCL

TEC current limit

TCA

TEC current actual

Содержание Laser Lab Source LDC Series

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

Страница 2: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 35: ......

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