Spengler LeECG Series - AC Interference; EMG Interference

11-2
No. Messages or Troubles Solutions
21
AC Interference
Symptom: There is an overlap
of 50Hz sine wave with certain
amplitude and regularity on
the ECG traces, and obvious
jitter appears on the ECG
baseline.
Check the following aspects of the
device for solving problems:
 The device is properly
grounded.
 The electrodes and leadwires
are correctly connected.
 Enough conductive paste is
applied to the electrodes and
the patient's skin.
 Patient bed is properly
grounded.
 Patient not come into contact
with conducting objects such
as metal parts of the patient
bed.
 Nobody is touching the patient.
 There is no powerful electrical
equipment operating nearby,
such as X-ray machines or
ultrasonic instruments.
 The patient is not wearing glass
or diamond ornaments.
 AC filter frequency is properly
set.
If the interference cannot be
cleared after the above measures,
use an AC filter, and the recorded
waveform is slightly attenuated.
22
EMG Interference
Symptom: The ECG has
irregular fluctuation while the
baseline demonstrates no
change.
Check the following aspects of the
device for solving problems:
 The room is uncomfortable?
 The patient is nervous or feels
cold?
 The bed is too narrow?
 The patient is talking?