KEW6305
5.4
5.3 Using supplementary VT/ CT’s (not supplied with the instrument)
DANGER
●
Never make measurement on a circuit in which electrical potential exceeds AC600V.
●
Connect the Power cord to a socket outlet. Never connect it to the socket outlet of AC240V or
more.
●
This instrument must be used on the secondary side of VT(transformer) and CT(current
transformer).
●
Do not open-circuit the secondary side of a supplementary CT while it is energized because of
the high voltage generated at the secondary side terminals.
CAUTION
●
When a VT or CT is used the measurement accuracy is not guaranteed due to several factors
namely phase characteristics and VT/CT accuracies.
The use of supplementary VT/CT’s may be required if the voltage/current values of the circuit under
test fall outside the instrument measuring range.
In this case the value at the primary side of circuit
can be obtained directly by measuring the secondary side with appropriate an VT or CT installed in
the line under test as follows.
<Example of single-phase 2-wire (1ch) “1P2W(1ch)”>
In this case, set the actual ratio of VT and CT to be used.
* VT ratio: “
Setting 05
”
* CT ratio: “
Setting 06
”
VN
V1
A1
N
L
Source
Load
VT
CT
i
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