Quantum Instruments Cascade Laser Starter Kit Sensing level and range adjustement, = 1.22 to

Page 48

Starter Kit Instruction Manual

Maintenance

47

Sensing level and range adjustement

 

 

 

[4] Replace the cable connected to J8 (4) with

 

 

the 100Ω 1% reference resistor in the follow-

 

 

ing way:

 

 

1

Connect one side of the resistors to pins 1 and

 

2

 

 

2, the other side to pins 3 and 4.

 

 

3

 

 

 

[5] Measure the voltage on Zn3/R10 (3).

 

 

4

Note: The value should be:

 

 

 

 

 

- V = 1.22 to 1.25V.

 

 

5

 

 

 

[6] Measure the voltage at the intersection of

 

6

R19/R35 (5).

 

 

 

Note: The value should be: V=100mV (ad-

 

 

justable with the potentiometer P1 (2)).

 

 

 

Note: If the range is too small, replace the

 

 

resistor R1 (1) = 1.3kΩ with 1.4kΩ.

 

 

 

[7] Set the selector (9) to display Real ◦C.

 

 

[8] Adjust the trimmer P6 (6) in order to ob-

Fig.39: TCU151 main board

 

tain the value of 000 ◦C on the screen (8).

 

[9]Vary the Temperature Reference by using the Set Temperature 5 turns potentiometer

(7)located on the front panel.

Note: The range displayed should be -074 to + 074.

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Fig.40: TCU151 front panel

Page 47 Page 49
Image 48
Page 47 Page 49
Contents Quantum Cascade Laser Starter Kit Instructions Manual Web versionContents Installation TroubleshootingMaintenance Overview UseAppendix Identification DocumentLimited waranty ManufacturerGeneral Chapter overviewGeneralities ComplianceGlossary PersonsProduct PersonnelCommands style Procedure styleTypographic conventions Description styleProblem Procedure effects styleSee page x-y Troubleshooting style Possible causePage Safety Instructions Importance of safety instructionsNon-compliance with the safety regulations IntroductionGeneral safety instructions Environmental conditionsCompliance and informa- tion Description System CompositionDFB and FP Quantum Cascade Lasers If no configuration is specified, the DN pad is usedDescription Geometry of QC lasersSpecifications Electrical model characteristics Electrical modelLaboratory Laser HousingLLH100 LLH100 external view descriptionLaboratory Laser Housing internal view LLH100 internal viewSpecifications of the Peltier connector Thermo-Electric Cooler TEC and PT100 connectionsSpecifications of the measurement connector Measurement connectionQCL pulser switching unitLDD100 QCL pulser switching unit front and rear viewQCL pulse switching measuring unit GeneralitiesMeasured voltages Timing dataLaser peak current Duty cycle calculationLaser peak voltage Average dissipationAccuracy considerations Trigger and logic output signals Ω TTL driver circuit QCL pulser timing unit TPG128QCL temperature controllerTCU151 Peltier and PT100 connectionsInstallation Chapter overview Packing listGeneral Standard itemsSetting the appropriate AC voltage on TCU151 Procedure110-120V, 60Hz USA 220-240V, 50Hz Europe Installing the starter Kit Before beginningConnecting Starter Kit Use QCL pulse timing unit com- mand descriptionTCU151 command description TCU151 temperature controler front panelLaser utilisation OverviewProceedings Starting the TPG128 Procedure Interlock utilisation Interlock utilisationTroubleshooting Power supply reaches max cur- rent for a very low voltageDC power supply is not floating PrincipleLaser draws current but gives no light Laser does not draw currentQCL laser is not used with the LLH and is grounded There is no contact with the laserMaintenance How to remove the covers of TCU151 and TPG128Overview Replacement procedures Quantum Cascade Laser replace MentFacet on the case, it is extremely fragile + LLH100 connectionQCL UP and DN position Exchange Exchanging the laserIf the ambient atmosphere is humid this is HumidityTCU151 temperature con Troller interlock setting Procedure interlock settingBefore beggining interlock set Ting Needed materialCalibaration procedures Procedure calibration1 TPG128 calibration GeneralitiesTPG128 main board TPG128 main board 2 TCU151 temperature controller calibration Procedure +5V/-5V power supply checkSensing level and range adjustement = 1.22 toTemperature Reference offset adjustment Current/Voltage ratio adjustment SettingOscillator check LCD screen should display 1.00 a7V = 70 C If needed, adjust it with the trimmer P92 Starting the power section of the instru MentCurrent adjustment → Value displayed ≤ 1A→ Value displayed should tend to the defined value Miscellaneous functions testing Temperature Limit testing → The temperature displayed 2 should be 035 CThreshold on → The red LED 1 should turn offApplication notes Detection techniquesDirect absorption Frequency modulation technique TildasPhotoacoustic detection Photoacoustic techniqueAppendix Bias Circut Bias-TGeneral Utilisation What has to be kept in mind before use? Current and voltage ranges of the Bias-T cir- cuit Avoid reverse polarity on the inputUnpacking NS laser from its transportation box Unpacking instructions for NS submounts
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