18
1. Insert blue, red test leads to
L1, L3
input terminal.
2. Insert black test leads to
COM
input terminal and connect it to the
neutral wire of the 3 phase.
3. Jump over to the second phase measurement.
4. The first and the third phase measuring method is same as 3 phase 4
wires.
In figure 15
Σ
W = W2 + W3.
NOTE
• It can only sum up the current measurement value. The maximum and
minimum value cannot be summed up.
• Only at
KW
range can you carry out sum of watts measurement, other
ranges cannot carry out this measurement.
• When testing has been completed, disconnect the connection between
the test leads and the circuit under test and remove test leads from the
input terminals.
8.5. Apparent Power (main display) + Reactive Power
(secondary display) Measurement
• Please refer to C
8.6. Reactive Power (main display) + Apparent Power
(secondary display) Measurement
• Please refer to C.
8.7. Power Factor (main display) + Phase Angle (secondary
display) Measurement
To test for Power factor (main display) + Phase angle (secondary display),
connect the Meter as follows:
1. Dial the Rotary to
cosθ
to select Power Phase angle range.
2. Press the lever to open the transformer jaw, and clamp them to the
corresponding phase of tested conductor. If user needs to measure any
phase of the 3 phase, then clamp them to that phase's conductor.
3. The connecting method of 3 phases 4 wires or 3 phases 3 wires, refer
to figure 6 and 15
4. When measuring 3 phase 4 wires: (see figure 18, 19 and 20)
• Press
SEL
to choose the first phase , see figure 18.
WARNING:
To avoid damages to the Meter or harm to you, do you
measure higher than AC voltage 750V rms and AC current 1000A rms.
Summary of Contents for MT790
Page 1: ...INSTRUCTION MANUAL 1000A AC POWER CLAMP METER MT790 ...
Page 2: ...2 ...
Page 25: ......
Page 26: ......
Page 27: ......