Fluke 435 user manual Order 1st 2nd 3rd 4th 5th 6th, Order 7th 8th 9th 10th 11th

Fluke 434/435

Users Manual

Available function keys:

	Assign up/down arrow keys to select a row from the Meter
F1
	screen for Trend display.
	Cursor on/off.
F2

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 (-). The table below gives an overview.

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
Sequence	+	-	0	+	-	0
Order	7th	8th	9th	10th	11th	...
Frequency	420 Hz	480 Hz	540 Hz	600 Hz	660 Hz	...
	350 Hz	400 Hz	450 Hz	500 Hz	550 Hz
Sequence	+	-	0	+	-	...

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 non-linear loads like DC power supplies. When the current distortion starts to cause voltage distortion (THD) of more than 5 %, this signals a potential problem.

K-factor: this is an indication of the amount of harmonic currents and can help in selecting transformers. Use the K-factor along with KVA to select a replacement transformer to handle non-linear, harmonics-rich loads.

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