Fluke 434/435
Users Manual
Available function keys:
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| Assign up/down arrow keys to select a row from the Meter |
| F1 |
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| screen for Trend display. |
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| Cursor on/off. |
| F2 |
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F3
F4
F5
Assign arrow keys to Cursor or vertical Zoom operation.
Return to Meter screen.
Switch between HOLD and RUN of screen update. Switching from HOLD to RUN invokes a menu to select immediate (NOW) or TIMED start time which allows you to define start and duration of the measurement.
Tips and Hints
The harmonic number indicates the harmonic frequency: the first harmonic is the fundamental frequency (60 or 50 Hz), the second harmonic is the component with two times the fundamental frequency (120 or 100 Hz), and so on. The harmonics sequence can be positive (+), zero (0), or negative
Order | 1st | 2nd | 3rd | 4th | 5th | 6th |
Frequency | 60 Hz | 120 Hz | 180 Hz | 240 Hz | 300 Hz | 360 Hz |
| 50 Hz | 100 Hz | 150 Hz | 200 Hz | 250 Hz | 300 Hz |
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Sequence | + | - | 0 | + | - | 0 |
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Order | 7th | 8th | 9th | 10th | 11th | ... |
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Frequency | 420 Hz | 480 Hz | 540 Hz | 600 Hz | 660 Hz | ... |
| 350 Hz | 400 Hz | 450 Hz | 500 Hz | 550 Hz |
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Sequence | + | - | 0 | + | - | ... |
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Positive sequence harmonics try to make a motor run faster than the fundamental; negative sequence harmonics try to make the motor run slower than the fundamental. In both cases the motor looses torque and heats up. Harmonics can also cause transformers to overheat. Even harmonics disappear if waveforms are symmetrical, i.e. as equally positive and negative.
Zero sequence current harmonics add in Neutral conductors. This can cause overheating of these conductors.
Distortion. Current distortion is to be expected in a system with
