Wire Connection - UNI-T UTE310 Quick Manual

Quick Guide

7.3 Wire Connection

UTE310 digital power meter only supports a single two-wire power supply measurement. The measurement
can be in accordance with the several wiring methods described in this subsection for wire connection, and
to ensure that the measurement of the voltage and current is within the input range of the instrument. The
UTE310 has two input methods for voltage measurement, four input methods for current measurement, and
a total of eight input methods for power measurement. These are shown in the table below.
Current
Voltage
Direct Input
VT Transformer
Explanation
VT: voltage transformer
CT: output current type current sensor, such as current transformer, current output clamp current
sensor
EXT: current sensor/shunt of output voltage type
In this section, the shunt is mainly used to illustrate the wiring diagram, and the voltage output clamp current
sensor is also used in the practical application.
Notes
1. The load current flows along the thicker wires in the wiring diagram below, so that these wires
need have a sufficiently large safe current-carrying capacity.
2. Turn off the power supply of the load and the instrument when the load end is wiring.
3. When measuring large currents/voltages or the current containing high frequency components,
special attention should be paid to the possibility of mutual interference and noise problems
when wiring.
4. To avoid stray capacitance affecting the measurement results, the test leads should be as short
as possible.
5. In order to minimize the distributed capacitance to ground, the wire and grounding line should
be as far away from the casing as possible.
7.3.1 Wire Connection of Direct Input Voltage and Current (①)
Wire connection schematic diagram when measuring the signal with large current

Instruments.uni-trend.com
Direct Input CT Transformer
①
⑤
EXT
(External Current
Sensor Input)
② ③
⑥ ⑦
UTE310 Digital Power Meter
CT Transformer + EXT
(External Current
Sensor Input)
④
⑧
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