Select " Spectro " from the software command line (at the top of the software screen). If there is an issue connecting the instrument, an error message will occur indicating the connection has failed. This guide is designed to help you identify and resolve the most common problems quickly and easily, ensuring your measurements. This spectrophotometer troubleshooting guide is here to help you catch problems before they impact your results. If you've ever wondered why absorbance readings seem inconsistent or why your baselines shift unexpectedly, you're not alone, and you're in the right place. Each spectrophotometer is. With any spectrophotometer, scientists need to look out for errors.