Analog Output; Table 20: Nurse Call Relay Pin States; Table 21: Rating Of Nurse Call Relay - Nellcor OxiMax N-595 Service Manual

Analog Output

N-595
alarm and no alarm conditions, and for instrument off. Table 21 defines the ratings
of the Nurse Call relay.

Table 20: Nurse Call Relay Pin States

Pin
7 N.O.
8 N.C.

Table 21: Rating of Nurse Call Relay

Maximum Input
Voltage
Load Current
Minimum Resistance
Ground Reference
Electrical Isolation
Analog outputs are provided for Saturation, Pulse Rate, and a plethysmographic
waveform.
The output voltage is 0.0 to +1.0 VDC for all three parameters. A 1.0 VDC output
for saturation equals 100%; for pulse rate it equals 250 bpm; and for
plethysmographic waveform, it equals 254 pulse amplitude units. The voltage will
decrease as the values for these parameters decrease. If no data for a parameter is
available, the output voltage for that parameter will be 1.0 VDC.
After the completion of power-on self-test (POST), the instrument will initiate an
automatic three-step calibration signal. The calibration signal will begin at 0.0
VDC and hold that point for 15 seconds. It will then increase to 1.0 VDC and hold
that value for 15 seconds. The third part of the calibration signal is a stair step
signal. The stair step signal will start at 0.0 VDC and increase up to 1.0 VDC in
0.1 VDC increments. Each increment will be held for 1 second. Through use of
the softkeys, the 0.0 VDC, 1.0 VDC, or stair step signal can be selected
individually (see Analog Output on page 22).
No Alarm or
Audible
Alarm
Alarm
Silenced
Open Closed
Closed Open
30 VA or DC (polarity is not important)
120 mA continuous (peak 300 mA @ 100 ms)
26.5 ohms to 50.5 ohms (40.5 ohms typical) during
alarms
Isolated Ground
1500 Volts
Data Port Interface Protocol
Instrument
Off
Closed
Open
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