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Operating Instructions—7623A/R7623A Operators
LIGHT FILTER
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The tinted filter provided with the 7623A minimizes light reflections from the face of the crt to
improve contrast when viewing the display under high ambient light conditions. This filter should be
removed for waveform photographs or when viewing high writing rate displays. To removethe filter,
pull outward on the bottom of the plastic crt mask and removeit from the crt bezel. Remove the
tinted filter; leave the clear plastic faceplate protector installed and replace the bezel. The faceplate
protector should beleft in place at all times to protect the crt faceplate from scratches.
An optional meshfilter is available for use with the 7623A. This filter provides shielding against
radiated emi (electro-magnetic interference) from the face of the crt. It also serves as a light filter to
make the trace more visible under high ambient light conditions. The mesh filter fits in place of the
plastic crt mask and the tinted filter. The filter can be ordered by Tektronix Part No. 378-0603-00.
BEAMFINDER
The BEAMFINDER switch provides a means of locating a display which overscans the viewing
area either vertically or horizontally. When the BEAMFINDER switchis pressed and held, the display
is compressed within the graticule area. Release the BEAMFINDER switch to return to a normal dis-
play. To locate and reposition an overscanneddisplay, use the following procedure:
1. Press and hold the BEAMFINDER switch.
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2. Increase the vertical and horizontal deflection factors until the vertical deflection is reduced to
about two divisions and the horizontal deflection is reduced to about four divisions (the horizontal de-
flection needs to be reduced only when in the X-Y mode of operation).
3. Adjust the vertical and horizontal position controls to center the display about the vertical
and horizontal center lines of the graticule.
4. Release the BEAMFINDER switch; the display should remain within the viewing area.
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