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| Key Sequence | Function | |--------------|----------| | FUNC → 1 | Set wavelength | | FUNC → 2 | Dual wavelength mode | | FUNC → 3 | Time program (wavelength change during run) | | FUNC → 4 | Lamp control (on/off) | | FUNC → 5 | Cell temperature control | | FUNC → 6 | Range / AUFS setting | | FUNC → 7 | Polarity (+/-) | | FUNC → 8 | Wavelength calibration | | FUNC → 9 | Diagnostics / service |

can monitor two wavelengths simultaneously. Use this to create a ratio chromatogram for purity determination Scinteck Instruments Wavelength Programming shimadzu spd20a user manual better

: Allow the detector at least 30 minutes of warm-up time before starting your run to minimize baseline drift. | Key Sequence | Function | |--------------|----------| |

Regular upkeep is critical for maintaining peak performance. shimadzu spd20a user manual better