Respironics 920M Service Manual download pdf (Page 26)

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

and pulse

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.

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Respironics 920M Service Manual Page 26