Section 4 - Waveform Mode
4-10
VM700A Option 01 (NTSC) & Option 11 (PAL) User Manual
Clamp Fast: selects fast clamp speed. This removes DC offset, hum,
and bounce effects from the signal.
DC Coupling: selects DC coupling (no clamping).
Duration: selects 0.5 ms, 0.67 ms, 1.0 ms, or 2.0 ms clamp gating
widths. Wide gating widths provide better noise immunity, but signal
distortions may not provide a wide enough sustained level.
Select Line
In Waveform mode, pressing the Select Line button switches the control knob to
a digital line select function. When either no menu or the Waveform menu is
displayed, pressing Select Line also displays the Select Line menu, which is
structured as follows
Field Toggle: toggles the system line to the other field (for PAL, +313 lines
if the system line was from 1 to 313, –313 lines if the system line was from
314 to 625). In freeze mode, the change is limited to the acquired area.
Field n Line nn (NTSC)/Line nn (PAL): displays the system line specified
by the soft key. To change the line number, select and hold the soft key to be
changed, turn the knob until the new line number is found, and release the
soft key. In Freeze mode, the change is limited to the acquired area.
Field 1 or 2/Field 3 or 4 (NTSC): When selected (default), color frame 1
(fields 1 or 2) or color frame 2 (fields 3 or 4) are displayed.
Frame 1/2/3/4 (PAL): When selected, the corresponding frame is included
in the display. The default is all four frames selected.
Although the Select Line button responds in all submenus, the Select Line menu
will not replace any submenus, only the main Waveform menu. Select Line
always disables the Move/Expand function of the control knob, but does not
disable the Display and Graticule Intensity control functions.
System Line
Changing the displayed line in Waveform mode or any of the manual modes
(Waveform, Vector, Picture, and Measure), changes the current line for all the
manual modes. This line is referred to as the “system line.” The leftmost line
number on the display is the system line.
However, both Vector mode and Measure mode can operate independently of the
system line. In Vector mode, you can select an independent Vector Line (found in
the Select Line menu in Vector mode). See Section 5 for more information on the
Vector Line. In individual measurements, the Default Line Sel. soft key changes
the displayed line to the measurement line specified in the Measurement
Locations file.
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