Fluke Biomedical DALE601 - Manual (Page 27)

Operation
Preliminary Steps
2
2-3
Preliminary Steps
The Analyzer measures electrical parameters, as described below. These
voltages and currents are a natural phenomenon, and their presence within
reasonable limits does not constitute a hazard. However, it is necessary to
measure their values to determine if there is a significant change from previous
measurements or from the device specifications.
Figure 2-1 is a block diagram of a typical line-operated instrument with patient
connections. Measured parameters are labeled, and the discussions that follow
are keyed to the labels in the diagram.
ENCLOSURE
CHASSIS
120/220 Vac
Earth
A
I
I
I
P
I
V
L
L
L
L
L1 (Hot)
L2 (Neutral)
Ground
R
R
L
I
E
I
C
I
Z
Z
C
C
G
L
I
Isolated
Patient
Circuit
Grounded
Data and
Control
Circuits
fcu20.eps
Figure 2-1. Block Diagram of a Line-operated Instrument