Datex Gas Bench Challenge - damped N2O data

Datex Gas Bench Challenge - damped N2O data I am using a Datex Cardiocap/5 to track the evolution of O2, Co2 and N2O concentrations during the first few minutes of changing the inspired mixture (this is in the context of volunteer study/novel equipment configuration). I am able to read out and export the %concentrations using the right cable from https://www.medicollector.com/support-compatible-devices.html crazy expensive software (didn't buy it) but it works in demo-mode (with the right cables&) and this amazing free software from Korea https://vitaldb.net/vital-recorder/ so i'm using the US cable with the Korean software. so far, so good, great stream of O2 and CO2 waveforms but the nitrous is damped. Any ideas? In service mode I can see the instantaneous voltages for all three gasses. O2 and CO2 look dynamic  up and down per breath. In contrast the N2O trace looks like an average rather than breath-by-breath. So what is the diagnosis? This is in a non-operating room environment and I have no capacity for volatile anaesthetic so I cannot say whether that is working. The waveforms also look as described if viewed on screen (no option for N2O waveform) or by inspection of the voltages within the service mode. Digital export through the x2 port/Korean software and as analogue voltages on the analogue outlet onto a voltmeter all look similar (dynamic O2 and CO2, cluggish N2O) so I guess it is a real thing& Might it relate to the SRAM battery issue mentioned in another thread? Im up for replacing the battery if need be but dont want to lobotomise my machine and nervous about any general reset.. Any ideas or advice much appreciated Thanks Rob