Section 2 - Installation and Operation
2-4
VM700A Option 01 (NTSC) & Option 11 (PAL) User Manual
manual modes are Waveform, Vector, Picture, and Measure. The power-on
default mode is Waveform.
The manual modes perform the specified operation and provide a graphic display
with digital readouts plus status information. Auto mode makes measurements
automatically and provides a tabular listing of the measurement results.
Reporting of measurement results can be performed in both manual and Auto
mode.
Parameters such as clamping, sync source, and the displayed line (system line)
are common for all the manual modes of operation. However, manual mode
parameters do not carry over to Auto mode. Parameters for both Auto mode and
the manual modes are set through the directory and file structure accessed
through the Configure button.
The second row down in the keypad contains the Freeze button, the input
channel selection buttons (grouped as SOURCE A, B, and C), and the Average
button.
Freeze. When Freeze is selected, signal acquisition is halted. The frozen display
may be repositioned or resized according to the application, as described below
under Control Knob, but the display is not updated. Starting a new measurement
or operation unfreezes the display.
Source and Polarity Selection. For all operational modes, one of the input sources
is always selected. Selected sources are indicated by a lighted LED in the panel
button.
For some modes, an input source can be inverted. This feature may be used to
invert a positive-sync video signal to obtain the correct polarity for measurement
by the VM700A. To invert a single source, press and hold the source button
approximately one second, until the instrument beeps. When a source is inverted,
the LED on the source button blinks. To invert a second source and add it to
another, press and hold the normal (non-inverted) source and, while holding it,
quickly press and release the inverted source. The LED on the inverted source
will flash.
In Waveform and Vector modes, an inverted source can be the sole input or it can
be added to another input. In Measure mode, an inverted source can only be
added to another source.
Average. The Average button enables noise reduction (averaging) on the signal in
Waveform, Vector, and Measure modes. The amount of noise reduction (up to
30.10 dB) is set with the Noise soft keys. The number of averages (up to 256) is
set with the Average Num soft keys.
The third row down in the keypad contains support functions: Menu, Help,
Configure, Function, and Copy. All of these functions except Copy are toggled
Freeze. Source Selection,
and Average Functions
Support Functions
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