KYORITSU 6315 Instruction Manual - Manual (Page 56)

KEW6315 VT/ CT
KEW6315 - 54 -
VT/CT*
* This setting belongs to Current measurement setting.
DANGER
● With attention to the measurement category to which the object under test belongs, do not make
measurements on a circuit in which the electrical potential exceeds the following values.
* 300V AC for CAT. IV, 600V AC for CAT. III, 1000V AC for CAT. II
● Connect the Power cord to an outlet. Never connect it to the outlet of AC240V or higher.
● This instrument must be used on the secondary side of VT (transformer) and CT (current transformer).
● Do not open-circuit the secondary side of the 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 (1-system) “1P2W x 1” >
When rating of the secondary side of CT is 5A, use of Clamp sensor 8128 (50A type) and testing
at 5A Range is recommended.
In this case, set the actual ratio of VT and CT to be used.
VN V1 A1
N
L
Power
source
Load
VT CT
i