First of all the equipment we had.
Monitor: HP Omnicare M1204A
Patient simulator: FLUKE Biomedical PS420
We had to test all the respiration rate options available on patient simulator (ranging from 0-120). The error occured only when the RR and HR were the same value, if for example HR=80 and RR=20, then there were no errors.
For me, it seems like the most probable cause is that the monitor can't give out the values when they're in the 5% range within each other. I could check that in theory, but I don't know/don't think the patient simulator had the option to adjust custom HRs and RRs. We were using the manual and it stated only the available RRs: 0, 15, 20, 30, 40, 60, 80, 100, 120 [rpm] (and about the same values for HR).
I am going to defend these labs tomorrow to my professor. If this is not the correct answer, I will find out nevertheless.
