36 Chapter2
Making Adjustments
1b. Display (with eight access holes in top of shield)
1b. Display
(with eight access holes in top of shield)
This adjustment applies to:
All 8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
CAUTION All display adjustments are described in this adjustment procedure.
However, the FOCUS adjustment is the only adjustment that can be
performed without removing the instrument cover.
For all other adjustments, it is strongly recommended that you return
the instrument to your local sales and service office.
There are two different types of displays. If your display has eight holes
in the top of the shield, continue with this procedure. If it has four
holes, go to the preceding procedure.
If you are going to make adjustments to your display, only make the
adjustments that would correct the problem that the display is
experiencing.
The following is a list of adjustments described in this procedure:
The horizontal and vertical display positions should first be adjusted
using front-panel softkeys. These positions are then stored in
nonvolatile memory.
The Focus adjustment is located on the left side of the instrument and
can be accessed with the instrument cover on or off. All other
adjustments must be made with the instrument cover removed.
Equipment Required
Display adjustment tool, 0.075 inch hex (part number 8710-1010)
• Focus • Centering
• Horizontal Hold • Vertical Hold
• Vertical Size • Vertical Linearity
• Brightness • Contrast
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