Tektronix VM700T, Руководство пользователя

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Waveform Mode
VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual
3- 3
The lines of text directly below the horizontal graticule scale are referred to as
the status lines. The first line of text displays the units for the horizontal
graticule scale (microseconds or nanoseconds). This line also indicates when the
measurement set is performing self-calibration. The second line gives the APL
(Average Picture Level), and the on/off status of Precision mode and Sound-In-
Sync (PAL only). The third line shows the television standard in use, the type of
Filtering in effect or No Filtering if none is in effect, the method of sampling in
use (Synchronous/Asynchronous), and the selected Sync source. The fourth line
describes the clamping status and which frames are currently selected. Two
additional lines appear with cursors showing the cursor measurements. Any
menu called up will appear below the status lines and will cause the status lines
to move upward to make room for the menu selections.
The control knob is used with the toggling Move/Expand and Vertical/Horizontal
buttons to control waveform positioning and gain and with the Graticule and
Display Intensity buttons to set the brightness of the display. When the end of
range for a control knob assignment is reached, a slight clicking noise will be
heard if the knob rotation is continued in the out-of-range direction. Display and
Graticule intensity adjustment is controlled by the knob only when either of
those buttons is held. When the intensity buttons are released, the control knob
assignment reverts back to the Move/Expand positioning function.
Move/Expand. When entering Waveform mode, the control knob’s default
function is Horizontal Move (positions left and right). When Expand is selected
by pressing the Move/Expand button, the waveform expands around the center of
the screen. Expand is also selected when the active area of the screen is touched.
(The active area of the screen is that area above the horizontal graticule scale
line.) The point touched becomes the point about which the display expands. To
move or expand the display vertically, be sure the direction button indicator is
Vertical and then rotate the control knob.
Note that selecting Expand with the button is only necessary for one-handed
operation. Using the two-hand “touch and zoom” method is much easier. The
“touch and zoom” method makes use of the switching to Expand from Move
feature. Leave the Move/Expand choice in Move and select the direction, either
vertical or horizontal. Move the waveform to the point of interest, then touch the
screen at the point about which you wish the waveform to expand or compress.
The function of the control knob switches to Expand while the screen is touched
and defaults back to Move when you lift your finger from the screen.
Expand (Gain) Range. The horizontal gain of the default 1H Waveform display
can be continuously compressed or expanded to display from 10 ns to 704 s
(11 lines) across the screen. Vertically, the Volts scale ranges from 5 mV full
scale to 8 V full scale. The calibrated graticule scale tracks the waveform as it
expands, compresses, or moves, both vertically and horizontally.
Status Lines
Control Knob
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