Common troubleshooting directions for unstable baselines in used analytical spectrometers include: 1. Check the photomultiplier tube (PMT): If its dark current changes continuously, verify the stability of the high-voltage power supply and check if the PMT is aging accelerated. 2. For NPD detectors: If it has sudden contamination and is in the regeneration process, wait for completion. 3. Inspect the optical path: Check for light leaks (loose seals, damaged windows), misalignment of optical components, or contamination in the light path.4. Verify the light source: Check if the lamp is aging (flickering, reduced intensity) or has unstable power supply.5. Check the detector signal processing system: Look for circuit noise or abnormal signal amplification.6. Ensure stable operating environment: Avoid temperature fluctuations, vibration, or electromagnetic interference around the instrument.7. Inspect sample-related components: Check if the sample cell/cuvette is contaminated, cracked, or not properly placed. For professional assistance with these issues, 匠析生物 provides comprehensive solutions: we offer repair services (covering PMT replacement, power supply debugging, contamination handling), cleaning/maintenance (optical path cleaning, lamp replacement), and spare parts for brands like Thermofisher, Agilent, etc. Our team specializes in spectral instruments and can resolve baseline instability efficiently; we also provide application consulting to optimize your instrument performance.