Download AAMI EC11 - Electrical, Computer & Biomedical Engineering

weighting factors of standard lead sets.
For Frank leads:
a) Attach the device, set at the standard operating conditions, to the test circuit of figure 3 with switches
S1 and S2 closed and with the patient-electrode connections connected to P1 and P2 in each of the
configurations listed in table 8.
b) Adjust the sinusoidal generator at 10 Hz to the peak-to-peak amplitude given in table 8 for the
electrode set being tested.
c) Adjust any baseline control so that the signal is displayed in the middle of the recording channel.
d) Verify that the peak-to-peak values for the X, Y, and Z outputs are within the tolerances given in table
8 for each measurement.
4.2.7.4 Hysteresis
With the ECG device set at the standard operating conditions, a +1.5-mV pulse, having an exponential
trailing edge with a time constant of at least 50 ms, is applied to any patient-electrode connection. Two
seconds after application of the pulse, the output trace must have returned to within ± 0.5 mm of the initial
baseline value. This test is then repeated using a -1.5-mV pulse. The "response to minimum signal"
requirement can be checked by applying a 10-Hz, 20-µV p-p signal to any lead at a time base of 25 mm/ms,
and then inspecting the record.
© 2000 Association for the Advancement of Medical Instrumentation