THEORY OF OPERATION
The LKG 601 circuitry can be divided into main
functional blocks as shown in Figure 3. Each
performs a key role in the operation of the
instrument.
AAMI or
IEC 601
RMS TO
DC
F
U
N
C
T
IO
N
S
E
L
E
C
T
O
R
D
IS
P
L
A
Y
LEDS
CURRENT
SOURCE
AMP
TEST
RECEPTACLE
Figure 3
Functional block diagram of the LKG 601.
BLOCK DIAGRAM DESCRIPTION
Test Load:
The input test load is user selectable to
AAMI ESI –1993 or to IEC 601.
RMS Converter and Amplifier:
The input amplifier
buffers the input. The RMS converter generates a
DC voltage equal to the RMS value at its input.
The gain Amplifier sets the gain for the
measurements. When the MODE switch selects
leakage current measurement, the AAMI LOAD is
connected in front of the INPUT AMPLIFIER, and
the voltage developed across it from the leakage
current is measured.
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