Nellcor OxiMax N-550 Service Manual page 5

Repacking in a Different Carton .......................................................................... 79
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Performance ....................................................................................................... 81
Electrical ............................................................................................................. 82
Environmental Conditions ................................................................................... 82
Physical Characteristics ...................................................................................... 84
Compliance ......................................................................................................... 85
Safety Tests ........................................................................................................ 87
Data Port Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Introduction ......................................................................................................... 89
Enabling The Data Port ...................................................................................... 89
Connecting To The Data Port ............................................................................. 91
Real-Time Printout ..............................................................................................93
Technical Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Oximetry Overview ............................................................................................. 99
SatSeconds Alarm Management ......................................................................101
Reads Through Motion .....................................................................................101
OXIMAX Technology ........................................................................................102
MP-506 Interface ..............................................................................................102
Circuit Analysis .................................................................................................104
Block Diagram Theory ......................................................................................105
AC Input ............................................................................................................105
Power Supply PCB Theory Of Operation .........................................................106
Battery ..............................................................................................................106
Main PCB ..........................................................................................................106
N-550
Ground Integrity ..................................................................................... 87
Earth Leakage Current .......................................................................... 87
Enclosure Leakage Current ................................................................... 87
Patient Risk Applied Current .................................................................. 88
Patient Isolation Risk Current ................................................................ 88
Protocol .................................................................................................. 89
Baud Rate ..............................................................................................90
Nurse Call Polarity Settings ................................................................... 93
Nurse Call Relay Pin States .................................................................. 93
Nurse Call Relay Rating ........................................................................ 93
Column Heading .................................................................................... 94
Printout Source ...................................................................................... 95
Software Revision Level ........................................................................ 95
Alarm Limits ........................................................................................... 95
Column Headings .................................................................................. 95
Time Tag ................................................................................................ 96
Patient Data ........................................................................................... 96
Operating Status .................................................................................... 96
Automatic Calibration ...........................................................................100
Functional versus Fractional Saturation ..............................................100
Measured versus Calculated Saturation ..............................................100
Regulated DC Power Supply ...............................................................107
Controlling Hardware ...........................................................................107
CPU .....................................................................................................107
Charging Circuits .................................................................................108
Real-Time Clock (RTC) .......................................................................108
Contents
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