Memory Option (920M Only); Recording Sessions - Respironics 920 Instruction And Service Manual

D. Memory Option (920M only)
The memory option is identified by the "M" in the model number
(i.e., 920M as opposed to the 920). This model number is located
just above the serial number on the back of the unit. The 920M
Pulse Oximeter can collect and store up to eighteen hours of SpO
and pulse rate information.
The solid-state memory in the 920M functions much like the
"endless loop" tapes that are used in some telephone answering
machines. When the memory fills up, the unit begins overwriting the
oldest locations with the latest data.
Each time the 920M is powered up, the current time/date
information (if the clock is set properly) is stored in memory to allow
quick differentiation of recording sessions. Patient SpO
rate are sampled and stored every four seconds. The stored
resolution of the oxygen saturation is in 1% increments in the range
of 0 to 100 %. The stored pulse rate ranges from 18 to 300 BPM.
The stored values have a resolution of 1 BPM from 18 to 200 and a
resolution of 2 BPM from 201 to 300.
During the printing of the data, the last data recorded is the first
data printed. For example, the last four minutes of data recorded
would be the first four minutes of printout.

1. Recording Sessions

Each time the 920M is turned on (except while setting the clock)
data is automatically collected.
NOTE: Only recording sessions greater than one minute
in length are kept in memory for later printing.
18
2
and pulse
2