Purity Magnet Adjustment Raster - HP 16500A Service Manual

HP 16500A/16501A - Adjustments
Landing Adjustment (Continued)
6. Move the deflection yoke towards the rear of the instrument, until the left edge of the raster turns red
raster turns blue. See figure 4-16.
7. Adjust the purity magnets until green is in the center of the raster with red and blue bands evenly
distributed on the sides. See figure 4-15. The purity magnets need no more than 15 movement
from the mechanical center.
8. Move the deflection yoke forward until the entire raster is green.
The landing adjustment is easier if the yoke is moved all the way forward and
then moved backward until the raster is completely green.
9. Replace the green raster with a full screen red raster. Check for proper landing adjustment (color
purity). Select a blue full-screen raster and check it for proper landing adjustment.
4-14
Figure 4-16. Purity Magnet Adjustment Raster
Note
and the right edge of the