Operator`s manual

Automatic Measurement (AVM-510A)
9-2
On the extreme left side is a series of boxes, some with a single dot, some with a “P,” and some empty.
They indicate the following:
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Single Dot  current value being measured.
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P  current value being measured and monitored by Picture Guard.
•
Empty  current value is not being measured (no graph or numerical value displayed).
To change the state of a parameter line, press one of the Arrow buttons. Afterwards, one of the
squares turns green. Use the Arrow buttons to move the green up or down. Next, press the Entr
button to change the state from empty to a dot, and for some parameters, to P. Note that many of the
parameters are not available in Picture Guard, as a result, the P state does not appear in those areas
after you press the Entr button.
NOTE:
Only the parameters in the System Video automeasure screen are available in
Picture Guard. Picture Guard always uses the System Video parameters.
At the top-center of the screen is a field and line number. This is the line that is sampled and measured.
To change the line, press the Line Select button and then turn the knob. If the Line Select LED is lit,
pressing the Line Select button changes the field.
•
If the signal name is in green, the AVM-510A determines what the signal is.
•
If the signal name is in red, the AVM-510A cannot determine what the test signal is.
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If the signal name is white, you have determined what the signal is.
The names of the parameters also have special meaning. If the name, such as Peak Video is in italics,
the parameter is being measured on all active lines, regardless of the line number that appears at the
top of the screen. Names not in italics are measured only on the selected line.
Additional Measurement Definitions
APL Average of the active video part of 10 lines sequenced through the field.
Close
caption
Indicates the presence or absence of the closed caption signal on line 21.
H blanking Indicates the width of horizontal blanking at its narrowest point throughout the field.
Diff phase Boxes show phase difference between the chroma reference and each step. Any step
exceeding 2 degrees shows a + or -. Any step exceeding the limit value turns red. The
readout value is the peak-to-peak error and turns red if the limit is exceeded.
Diff gain Boxes show amplitude difference between the chroma reference and each step. Any step
exceeding 2 percent shows a + or -. Any step exceeding the limit value turns red. The
readout value is the peak-to-peak error and turns red if the limit is exceeded.
Lum
linearity
Boxes show amplitude difference between the average of the steps (last step minus the
blanking divided by the number opf steps) and each step. Any step exceeding 2 percent
shows a + or -. Any step exceeding the limit value turns red. The readout value is the peak-
to-peak error and turns red if the limit is exceeded.