Operator's Manual

Chapter 6 Taking medical readings
Tempus Pro User/Operator Manual - 41-2001EN-00 – Page 66
6.1.7 ECG specifications
ECG monitoring specifications
The following disclosures are made in accordance with the requirements of AAMI EC13 and IEC60601-2-27:
 The ECG’s display includes the isoelectric segments of the QRS.
 For leads off detection, the ECG device applies a 1 kHz triangular wave of approximately 6 mV p-p
between the R/RL and L/LL electrodes
 The Heart Rate Detection of the ECG monitor is accurate to +/-10% or +/-5 bpm for a T Wave of
amplitude: up to 1.0 mV.
 The heart rate is calculated from the average of the 8 most recent RR intervals. Intervals are logged as
“invalid” if the detections are unreliable, or if detections are absent over the maximum RR interval of 2.4
s. Invalid intervals are counted but not included in the average. If there are no valid intervals in the
most recent 8, then no heart rate is reported. Heart rate is updated with every new valid or invalid
interval.
 Further to clause 4.1.2.1e) of AAMI EC13: the system’s response to Fig 3a is 40 bpm ±10% (inverted
QRS are counted). The system’s response to Fig 3b is 30-100 bpm (small QRS are intermittently
counted). The system’s response to Fig 3c is 120 bpm± 10% (all QRS are counted). The system’s
response to Fig 3d is 60-100 bpm (bipolar QRS are intermittently counted).
 Electrical noise such as power line transients can cause false heart beat detection which may inhibit
alarms. The problem may be minimized by ensuring good electrode contact. Power system noise may
be reduced by running the monitor from its battery.
 The system’s typical response time to change from 80 to 120 bpm is ~7 s, for a change from 80 to 40
bpm is the typical response time is ~7.5 s.
 The system heart rate alarm will respond to the specified tachycardia signals of Figures 4a and 4b of
AAMI EC13 within 5-7 s. In some cases, an out of range alarm may be given, with an indication of no
valid heart rate.
 The heart rate limit alarm will respond to an out of range condition 0-10 seconds after being activated.
ECG Summary Screen
Press here to
go to the ECG
Interpretation
page
Press here
to see the
ECG
recording
Press here to
start
monitoring the
12 lead ECG