802BT/802R Video Test Generator User Guide 199
between the start of active video (X:0) and the leading edge of the probe pulse in
the horizontal direction.
2. Set the vertical position by turning the Image knob.
The vertical position of the probe is simultaneously displayed in two different ways:
• The vertical position L:nnnn is given in whole scan lines relative to the leading edge
of blanking of the frame or first field.
• If the probe is within the active portion of the frame, an alternate vertical position
Y:nnnn is also displayed, indicating the number of lines between the start of active
(Y:0) and the leading edge of the probe in the vertical direction.
To position and activate the probe pulse:
1. Press the Step key. The cursor appears. You may have to turn the Format and Image
knobs to move the cursor into the active video. This feature allows you to visually move
the probe to an area of interest (within the active portion of the frame) without using
numerical coordinates.
2. Turn the Format knob to move the cursor horizontally. Turn the Image knob to move
the cursor vertically.
3. Activate the probe pulse.
Controlling probe using command line interface
Using the command line interface to control the probe provides more control, enables you
to change the polarity and width, and to change the format and image while maintaining
the probe pulse parameters.
To configure the probe feature:
1. Enable the probe feature by entering the following commands:
FSPG 0 // disable the frame sync on special sync output
PSPG 1 // enable the probe pulse
PSPP 1 // Set the probe pulse polarity (0 for low or 1 for high)
PSPW 10 // set pulse width to 10 pixels (range:
1 pixel to
HTOT
- 1
)
Action Procedure
Activate the probe pulse on the specified
scan line
Press the R and G keys. The light on the
keys extinguish.
Activate the probe pulse on all active scan
lines at the same horizontal position
Press the R key. The light on the key
illuminates.
Activate the probe pulse on all scan lines,
whether active or not at the same
horizontal position
Press the G key. The light on the key
illuminates.