Fluke 434 User Manual download pdf (Page 32)

Fluke 433/434

Users Manual

7-2

PERSISTence ON memorizes all waveform variations on

screen.

Switch between HOLD and RUN of screen update.

Cursor. When the Cursor is on, the waveform values at the Cursor are displayed in the

screen header. Positioning the Cursor across the left or right screen end brings the next

screen out of a maximum of 6 within viewing area.

Zoom. Allows you to expand or shrink the display vertically and horizontally to view

details or to see the complete graph within the screen area. Zoom and Cursor are operated

by the arrow keys and are explained in Chapter 17.

Offset and Span of waveforms are preadjusted for a good display in almost all cases. This

is based upon Nominal Voltage (Vnom) and Current range (A Range).

If desired, you can change them. The adjustment menu is reached via the SETUP key and

function key F3 - FUNCTION PREF. See Chapter 18, FUNCTION PREFerences.

Scope Phasor

To access the Phasor screen:

The Phasor screen displays the phase relation between voltages and currents in a vector

diagram. The vector of reference channel A (L1) points in the positive horizontal

direction. Additional numerical values are fundamental phase voltage, frequency, and

phase angles. The screen header shows rms voltage and/or current values.

Available function keys:

Selection of additional data to be displayed: all voltages, all

currents, or voltage and current phase by phase.

Return to the Scope Waveform.

Switch between HOLD and RUN of screen update.

Tips and Hints

Scope Waveform gives a clear view of current and voltage waveform shapes. Voltage

waveforms in particular should be smooth and sinusoidal. If you see voltage distortion, it

is a good idea to check the harmonics display. The rms voltages and frequency should be

close to their nominal values.

Waveform and Phasor display are also useful to check if voltage leads and current clamps

are connected correctly. In the vector diagram the phase voltages and currents L1 (A), L2

(B), and L3 (C) should appear in sequence when observing them in clockwise direction.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 121 122

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Fluke 434 User Manual Page 32