202 User’s Manual TOS93 Series
Meter Mode
Constructing the Measurement Circuit
In meter mode, the current running across terminals A and B is measured. It is also possible to apply
110 % voltage to the EUT.
Construct the following circuit external to the product.
L
N
G
L
N
PE
B
A
Earth line failure
EUT
Network
TOS93
Polarity switching
Example: Measure the touch current (apply 110 % voltage to the
signal I/O section of the medical instrument)
L
L
L
N
PE
EUT
l
l
l
e
n
Line failure
Power
supply
T
B
A
Network
TOS93
Neutral line failure
Earth line failure
Example: Circuit for measuring the touch current of a three-phase device
with a star configuration TN or TT system
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