Quantum Instruments Cascade Laser Starter Kit manual 2 TCU151 temperature controller calibration

Page 47

Starter Kit Instruction Manual

Maintenance

46

8.4.2TCU151 temperature controller calibration

!WARNING ! Keep in mind that during the calibration procedure, the instrument is powered on.

Before beginning

[1]Power off the instrument.

[2]Open the TCU151 top cover (1) to access the TCU151 main board (2).

Material needed

•Voltmeter HP3458A or equivalent.

•Voltage source Keithley SMU237 or equiva- lent.

•Precision resistor 100 Ohm 1% or better.

•Cable: LEMO 6 poles female 6 bananas fe-

male (LEMO connector: LFGG.1B.306.CLAD72Z, LEMO handler GMA.1B.065.DG).

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Procedure

+5V/-5V power supply check.

CAUTION ! Do not connect the signal IN-34 V DC (connector J1 (3)).

[1]Check the input impedance between +5V/-

5V and GND

note: The values should be:

–TP1 (4) - GND (5): > 5 kΩ.

–TP2 (6) - GND (5): < 4 kΩ.

[2]Power on the instrument.

[3]Check the +5V/-5Vpower supply volt- age.

Note: The values should be:

–TP1 (4) - GND (5): 4.95 to 5.2 V.

–TP2 (6) - GND (5): 4.95 to 5.2 V.

Fig.37: Removing the top cover

3

4

5

6

Fig.38: TCU151 main board

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Image 47
Page 46 Page 48
Contents Instructions Manual Web version Quantum Cascade Laser Starter KitContents Use InstallationTroubleshooting Maintenance OverviewAppendix Manufacturer IdentificationDocument Limited warantyCompliance GeneralChapter overview GeneralitiesPersonnel GlossaryPersons ProductDescription style Commands styleProcedure style Typographic conventionsPossible cause ProblemProcedure effects style See page x-y Troubleshooting stylePage Introduction Safety InstructionsImportance of safety instructions Non-compliance with the safety regulationsCompliance and informa- tion General safety instructionsEnvironmental conditions System Composition DescriptionGeometry of QC lasers DFB and FP Quantum Cascade LasersIf no configuration is specified, the DN pad is used DescriptionSpecifications Electrical model Electrical model characteristicsLLH100 external view description Laboratory Laser HousingLLH100LLH100 internal view Laboratory Laser Housing internal viewThermo-Electric Cooler TEC and PT100 connections Specifications of the Peltier connectorMeasurement connection Specifications of the measurement connectorQCL pulser switching unit front and rear view QCL pulser switching unitLDD100Timing data QCL pulse switching measuring unitGeneralities Measured voltagesDuty cycle calculation Laser peak currentAccuracy considerations Laser peak voltageAverage dissipation QCL pulser timing unit TPG128 Trigger and logic output signals Ω TTL driver circuitPeltier and PT100 connections QCL temperature controllerTCU151Standard items InstallationChapter overview Packing list General110-120V, 60Hz USA 220-240V, 50Hz Europe Setting the appropriate AC voltage on TCU151Procedure Before beginning Installing the starter KitConnecting Starter Kit QCL pulse timing unit com- mand description UseTCU151 temperature controler front panel TCU151 command descriptionProceedings Laser utilisationOverview Starting the TPG128 Interlock utilisation Procedure Interlock utilisationPrinciple TroubleshootingPower supply reaches max cur- rent for a very low voltage DC power supply is not floatingThere is no contact with the laser Laser draws current but gives no lightLaser does not draw current QCL laser is not used with the LLH and is groundedOverview MaintenanceHow to remove the covers of TCU151 and TPG128 Quantum Cascade Laser replace Ment Replacement procedures+ LLH100 connection Facet on the case, it is extremely fragileExchanging the laser QCL UP and DN position ExchangeHumidity If the ambient atmosphere is humid this isNeeded material TCU151 temperature con Troller interlock settingProcedure interlock setting Before beggining interlock set TingGeneralities Calibaration proceduresProcedure calibration 1 TPG128 calibrationTPG128 main board TPG128 main board Procedure +5V/-5V power supply check 2 TCU151 temperature controller calibration= 1.22 to Sensing level and range adjustementTemperature Reference offset adjustment LCD screen should display 1.00 a Current/Voltage ratio adjustmentSetting Oscillator checkStarting the power section of the instru Ment 7V = 70 C If needed, adjust it with the trimmer P92→ Value displayed should tend to the defined value Current adjustment→ Value displayed ≤ 1A → The red LED 1 should turn off Miscellaneous functions testing Temperature Limit testing→ The temperature displayed 2 should be 035 C Threshold onFrequency modulation technique Tildas Application notesDetection techniques Direct absorptionPhotoacoustic technique Photoacoustic detectionGeneral AppendixBias Circut Bias-T Utilisation What has to be kept in mind before use? Avoid reverse polarity on the input Current and voltage ranges of the Bias-T cir- cuitUnpacking instructions for NS submounts Unpacking NS laser from its transportation box
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