         MONOSCOPE (1/4)

The Monoscope Pattern is the
traditional tool for calibrating
CRTs. This version aims to
provide several key elements to
ensure you make informed
decisions about Convergence and
Deflection. Refer to your monitor
service manual for procedures and
safety equipment.

1. #CBrightness Adjustable Pattern#C.
Electron Gun Alignment, or
Convergence, is usually adjusted
with a lowered brightness. Full
brightness can mask issues with
excessive bloom, especially if
your peak white is too high. You
can double check your adjustments
against the 30IRE pattern.


                       #C(cont...)#C
         MONOSCOPE (2/4)

2. #CStatic/Center Convergence#C. The
center crosshair is used to
evaluate static or center screen
convergence. 

3. #CDynamic/Edge#C can be evaluated
with the patterns on the side of
the screen.

4. #CCorner Convergence#C, corner
purity and corner geometry are
tightly linked. Static and
Dynamic convergence must be set
first before magnets can
successfully correct corner
issues.





                       #C(cont...)#C
         MONOSCOPE (3/4)

5. #CAspect Ratio#C. A new feature
to help set VSIZE and HSIZE
correctly is the red squares
embedded in the pattern. They are
calculated to display as perfect
squares on a properly setup
display.

You may want to start with a
small amount of horizontal
overscan, then use a tape measure
to adjust VSIZE such that the
outside edges of the red square
are the same in width and height.
This usually achieves an amount
of overscan that preserves the
Title Safe Area. Some games may 
not adhere to those boundaries, 
but most do.


                       #C(cont...)#C
         MONOSCOPE (4/4)

6. #CLinearity#C. Is the hardest part
of the deflection circuit.
Scrolling tests are the best way
to confirm good Linearity but
some compensated square elements
have added to each corner where
a tape measure may help get you
started.

You can press #YR#Y and #YL#Y buttons to
advance in 10 IRE steps in the
selected range.

You should target the #Ggreen#G
borders on CRTs.

   White    90%      #GGreen#G 91%
   #MMagenta#M  95%      #CCyan#C  100%

Pattern designed by #GKeith Raney#G

