64 Chapter2
Adjustment Procedures
2. Display Adjustment (8560E only)
Procedure
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and fold out the A2 Controller and A3 Interface
assemblies as illustrated in Figure 2-2 on page 63. Connect the CAL
OUTPUT to the INPUT. Adjustment locations are shown on the CRT
neck for A17 adjustments and in Figure 2-4 on page 67 for the A2
adjustments.
Preliminary Adjustments
2. Set A17R55 X GAIN, A17R75 Y GAIN, A17R92 DDD, A17R93
ASTIG, A2R206 DGTL X GAIN, A2R215 DGTL Y GAIN, A2R262
STOP BLANK, and A2R263 START BLANK to midrange. Also set
the rear panel X POSN, Y POSN, and TRACE ALIGN to midrange.
3. Set A17R21 Z FOCUS, A17R26 X FOCUS, and A17R11 CUTOFF
fully counterclockwise.
4. Set A17R4 Z GAIN fully clockwise.
5. Turn the spectrum analyzer on and allow it to warm up for at least 3
minutes. Adjust A17R11 CUTOFF until the display is visible and
A17R34 COARSE FOCUS for best possible focus.
Cutoff Adjustment
6. Press PRESET, DISPLAY, INTENSITY, 255, ENTER, STORE INTENSITY,
MORE 1 of 2, FOCUS, 127, ENTER, STORE FOCUS, then GRAT OFF.
Adjust A17R11 CUTOFF until the line between the bottom of trace
A and the annunciators at the bottom of the display just disappears.
Deflection Adjustments
7. Press GRAT ON, MORE 2 of 2, INTENSITY, 80 ENTER, STORE
INTENSITY, CAL, MORE 1 of 2, and CRT ADJ PATTERN. Fold up the A3
Interface assembly.
8. Refer to Figure 2-3 on page 66 for locating the lines used for
adjusting DGTL X GAIN and DGTL Y GAIN. Each of these lines is
actually two lines adjusted for coincidence. The two lines will form
an "X" if they are not adjusted properly.
9. Adjust A2R206 DGTL X GAIN until the two vertical lines near the
left edge of the display appear to be one single line.
10.Adjust A2R215 DGTL Y GAIN until the two horizontal lines near
the top edge of the display appear to be one single line.
To Next Page
Loading...
Need help?
General
