DESIGN OF SAFE MEDICAL DEVICE PROTOTYPES - Design and Development of Medical Electronic Instrumentation - page 130

MEASURING DEVICE

AAMI LOAD

V

OUTPUT

R2
10k

R1
1k

I1
AC=1 uA

High-Impendance
rms Voltmeter

+
-

C1
.015u

0

0 0 0

(a)

Figure 3.23 Leakage and auxiliary currents are measured using a load that simulates the impedance of a human patient. ( a ) The AAMI load
is the core of the current-measuring device defined by safety standards harmonized with EN-601-1. ( b ) This load presents an impedance of
approximately 1 k for frequencies up to 1 kHz.