35
Memory Functions
Memory Functions
Memory
The 9847 can collect and store up to 24 hours of SpO
2
and pulse rate information.
Nonin offers nVISION
®
Data Management Software for Oximetry Screening, for use with a personal
computer. nVISION is an easy to use Windows
®
-based program for pulse oximetry data retrieval,
analysis, report generation, and data storage.
The solid-state memory in the device functions much like an endless loop. When the memory fills up, the
unit begins overwriting the oldest locations with the latest data.
Each time the device is turned on, the current time/date information (if the clock is set properly) is stored
in memory to allow quick differentiation of recording sessions. Patient SpO
2
and pulse rate are sampled
and stored every four seconds. The oxygen saturation values are stored in 1% increments in the range
of 0 to 100%. The stored pulse rate ranges from 18 to 300 pulses per minute. The stored values have
increments of 1 pulse per minute from 18 to 200 pulses per minute, and increments of 2 pulses per
minute from 201 to 300 pulses per minute.
NOTE:
CO
2
detector data is not stored in memory.
During data retrieval, the last data recorded is the first displayed. For example, the last four minutes of
data recorded are the first four minutes displayed.
Recording Sessions
Each time the device 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.
Memory Playback Mode
1. With the unit off, press and hold the alarm limit review button while pressing and then releasing
the on/standby button.
2. Release the alarm limit review button when “
888 888
” is displayed on the SpO
2
and pulse rate
displays. Three brief beeps will sound and “
ALr
” and “
dFt
” appear in the SpO
2
and pulse rate
displays.
3. Data will be automatically played back from the memory.
NOTE:
The keypad sequence for starting memory playback is identical to the sequence used for
entering setup mode.
Data are played back at a rate of 20 minutes of collected data per second. A 24-hour recording session
(the maximum memory saved) is played back in approximately 1 minute. After all data are played back
the device should be shut off before collecting new patient data. The patient information is held in