Hello Guys, i hope you are doing well.
I have a question regarding a Cary 60. This instrument is 6 years old and it is used routinely in the lab. I see this instrument have a high value for the zero when it is initialized; once it is turned on, and finish the sequence, there is a value -1.1 Abs in the upper left corner (which is inusually high in my opinion). If i press the "Zero" button within the app Concentration, the instrument corrects this and i can "work" with it but i know this is not correct for example for low readings measurements or high absorbing samples.
In the other hand, i tried to optimize the lamp, and i cannot get more than 3.5%T with this lamp. Also, i have a spare one (new) and the results are the same. I think the light is missing somewhere between the Lamp exit and the entrance slit but i have not tested yet. With zero order, i can see the white light spot coming into the sample compartment just in the middle of the cell as should. so i think the light is reaching both reference and sample detectors.
I´m concerned about the high absorbance reading at the initialisation. I just though about the beamsplitter but not sure because this part is fixed. maybe the beam is not 50/50 reaching the Ref/sample and causing what i describe.
Another thing i see is that when doing IPT, the flatness baseline is "jumping" and making the test to fail. I have checked the Gear Segment and looks ok and no gap between this and the Motor Pinion.
I´m looking for some suggestions about this issue. I know this instrument is simple and reliable but this is the first time this happens with this kind of instrument.
I think that performing "Optical Alignment" from Diagnostics software will help.
Any comment is welcome. If you need any image related, i can post it.