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Single Channel ECG Test System | User Manual
50.102.5
Multichannel
cross talk
For this test, refer to Table 110 in IEC 60601-2-
51 to understand the relationship between
voltages applied to lead electrodes, and the
LEADS indicated on the screen.
With the test as initially instructed, there should
be no indication on LEAD I of the display. All other
LEADS (II, III etc) should have some indication.
The 2011 edition has completely updated this
test, and is worth checking for reference.
50.102.6
Gain control and
stability
Use either a triangle or sine wave (not specified
in the standard as the selection does not
impact the test).
51.102.7
Time base
Printing devices may have some variation
particular around page folds, so it is important
to test using the 25Hz waveform in the
standard.
However, for testing the screen it may be that
the width of line prevents individual lines from
being seen clearly. The nature of the screen is
such that variations are not expected, so a test
at 1Hz (e.g. a 100ms rectangle pulse with a
frequency of 1Hz) may be sufficient to measure
the actual time base. Alternately, reduce the
frequency by half (12.5Hz) at which individual
lines should be visible.
50.102.8 a) Frequency
response
A common complication with this test is which
filter settings to use, as patient monitors often
have a variety of filters. Also, mains notch
filters may impact the test result, with different
results for 50Hz and 60Hz settings. In order to
cover “normal use”, a minimum test in
“monitor” filter, with and without notch filters
is recommended. Note: 2011 edition states that
ac filters should be off (if selectable).
