Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP

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Lambda 20, Lambda 40 UV/Vis SpectrometersFor operation in the visible (Vis) range, mirror M1 reflects the radiation from thehalogen lamp onto source mirror M2. At the same time M1 blocks the radiationfrom the deuterium lamp.For operation in the ultraviolet (UV) range, mirror M1 is raised to permit radiationfrom the deuterium lamp to strike source mirror M2.Source change is automatic during monochromator slewing.Radiation from the source lamp is reflected from source mirror M2 through anoptical filter on the filter wheel assembly.A stepping motor drives the filter wheel to be in sychronization with themonochromator.Depending on the wavelength being produced, the appropriate optical filter islocated in the beam path to prefilter the radiation before it enters themonochromator.Filter change is automatic during monochromator slewing.From the optical filter the radiation passes through the entrance slit (Slit 1) of themonochromator.The radiation is dispersed at the grating to produce a spectrum. The rotationalposition of the grating effectively selects a segment of the spectrum, reflecting thissegment through the exit slit (Slit 2) to mirror M3.76
System DescriptionHalogenlampM2M = MirrorM1, M4, and M5 = Plane MirrorM2 = Toroidal MirrorM3 = Spherical MirrorDeuteriumlampM1Filter wheelSlit 1M5ReferenceDetectorLensSlit 2M3Beam SplitterGrating(Monochromator)M4SampleLensDetectorFigure 17 Optical Path for Lambda 20The exit slit restricts the spectrum segment to a near-monochromatic radiation beam.The slits provide a spectral bandpass of 1 nm, or 2 nm.From mirror M3 the radiation is reflected onto a beam splitter which allows 50% ofthe radiation to pass onto plane mirror M4, and reflects 50% of the radiation ontoplane mirror M5.Mirror M4 focuses the radiation beam in the sample cell.77
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Release HistoryPart Number Release
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Safety Information 1
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Lambda 20, Lambda 40 UV/Vis Spectro
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PrefacePrefaceApplicationThe Lambda
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Basic Installation 3
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Page 41 and 42: Accessory InstallationJ88, Sphere I
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Page 63 and 64: MaintenanceWARNINGElectrical Hazard
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Page 67 and 68: Maintenance5. Press 4 Print to feed
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Page 79 and 80: System DescriptionThe radiation is
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Page 93 and 94: Translations of WarningsTranslation
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Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP

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