Fluke 434 - Manual (Page 32)

Fluke 433/434
Users Manual
7-2
F4 PERSISTence ON memorizes all waveform variations on
screen.
F5 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:
d F3
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:
F1 Selection of additional data to be displayed: all voltages, all
currents, or voltage and current phase by phase.
F3 Return to the Scope Waveform.
F5 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.