14
Memory Functions (8500M only)
Memory Functions (8500M only)
Each time Model 8500M is turned on (except during Setup mode), data are automatically
collected in memory. The device can collect and store up to 72 hours of SpO
2
and pulse rate
information.
NOTE:
The device is not designed to retain data in memory once the batteries are
removed. Only recording sessions longer than 1 minute are stored in memory. Memory
will clear 3 minutes after removing the batteries. Replacing the batteries before 3 minutes
have elapsed most likely will result in corrupt data.
Nonin’s nVISION data management software is available for use with Microsoft Windows
2000/XP/Vista/7 operating systems. Refer to “Parts and Accessories.”
The memory in the device functions as an “endless loop.” When the memory fills up, the unit
begins overwriting the oldest data with the newest.
Each time the device is turned on, the current time/date information (if the clock is set
correctly) is stored in memory to allow quick differentiation of recording sessions. Patient SpO
2
and pulse rate are sampled and stored every 4 seconds.
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 are in
increments of 1 pulse per minute in the interval from 18 to 200 pulses per minute, and
increments of 2 pulses per minute in the interval from 201 to 300 pulses per minute.
Memory Download (8500M only)
NOTE:
Downloading the data in memory does not clear the memory.
Downloading the Data Stored in Memory
1. With the device off, press and hold the Advance/Dimmer button while pressing the
ON ( | )
button.
2. Release the Advance/Dimmer button when
888 888
is displayed on the SpO
2
and
pulse rate LEDs. The clock time currently set in the memory (
04 41
for example)
appears briefly in the displays and
y 07
appears (for example).
3. Data will be automatically downloaded from memory. Data is downloaded at a rate of
20 minutes of collected data per second. A 72-hour recording session (the maximum
memory saved) is downloaded in approximately 3.5 minutes.
4. After downloading is complete, the device should be shut off before collecting new
patient data.
5. The patient data is held in memory until the data is rewritten or the batteries are
removed for at least 3 minutes.