Motors - Urrea UD337 Manual De Usuario

You can measure any conductor
carrying AC unless this conductor is
at a potential above 600V AC or at a
frequency above 10KHz.
True rms measurement yields the
effective current value.
1. Press the ON-OFF pushbutton to
turn on this Meter.
2. Clamp around the conductor
to be measured. Be sure the
clamp jaws are securely closed, or
measurements will not be accurate.
3. Observe the display for true-RMS
current flow.
4. Press the Hz pushbutton to
measure frequency.
5. Press the HOLD pushbutton
to freeze the digital display, if
necessary.
6. To soften readings, press the
SOFT-CREST
(SOFT displayed) or to measure
half-cycle peak amperes, press this
pushbutton twice (PEAK displayed).
A crest factor (see 5.12 Using Crest)
other than 1.414 is an indication of
non-linear current flow.
7. To record readings and to view
readings, press the MIN-MAX
pushbutton.
pushbutton once
E N G L I S H
8. To clear RECORD, press the MIN-
MAX pushbutton for 2 seconds.

6.3 Motors

You can measure starting (inrush)
current, running current, and current
imbalance.
Inrush current is typically 6 times the
value of running current, depending
on the motor type.
1. Press the ON-OFF pushbutton to
turn on this Meter.
2. Clamp around a motor phase
conductor. Be sure the clamp
jaws are securely closed, or
measurements will not be accurate.
3. While watching the bar graph,
turn on the motor and observe
the level of inrush current. In this
case, the bar graph is better than
the digital display because the bar
graph response is faster than the
digital display.
4. When the motor reaches the
desired speed, observe the running
current.
5. Repeat your measurement for
each motor phases. Unbalanced
current may be caused by a voltage
imbalance, or a shorted motor
winding.
6. Repeat steps 1 thru 3, then
press the MIN-MAX pushbutton to
enable RECORD.
7. Turn on the motor. When the
motor gets to the desired speed,
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