The electronics provided by the original equipment manufacturers notably ARL is so well proven and reliable that for existing spectrometers, we have never seen a worthwhile upgrade system that has ever been as good as the original equipment. This is little wonder as the ARL 3460 system for example has proven to be so reliable that for decades now it has hardly changed and the equipment is still currently produced.
Of the 'upgrades' we have seen, they offer no advantage and in many cases perform less well than the original equipment and are notoriously difficult to support as they are in many cases produced by one man bands. We have even recently heard that an 'upgrade' is available for ARL equipments so that any faults in it can be remotely diagnosed ! Should you want this then of course we could give you this option which can be done using PC Anywhere which is a piece of software by Symantec and is readily available.
Before you consider this, our figures suggest that the average period between electronic breakdowns on the 3460 series of equipment is less than one in four years. The most common fault is power supply failure so this would of course stop the ability to remotely diagnose any problems in any event.
Between Compass and Pinhills, there are many years of stock of components. It is invariably better to have an engineer visit unless you are in a very remote location.