45
Pulse Oximeter Response Time
If the signal from the sensor is inadequate, the last measured SpO
2
and pulse rate values freeze
for 10 seconds and are then replaced with dashes.
Example: SpO
2
Exponential Averaging
SpO
2
decreases 0.75 % per second (7.5 % over 10 seconds)
Pulse Rate = 75 BPM
Specific to this example, the response of the 4 beat-average is 1.5 seconds.
SpO
2
Values
Average
Latency
Standard/Fast Averaged SpO
2
4 beat exponential
2 beats
Pulse Rate Values
Average
Latency
Standard/Fast Averaged Pulse Rate
4 beat exponential
2 beats
Equipment Delays
Delays
Display Update Delay
1.5 seconds
Alarm Signal Generation Delay
0 seconds
CAUTION:
A functional tester cannot be used to assess the accuracy of a pulse
oximeter monitor or sensor.
!
