Agilent Technologies 856290216 Preliminary Adjustments, Cutoff Adjustment, Deflection Adjustments

2. Display Adjustment

Procedure

Note	Perform the 16 MHz PLL Adjustment in this chapter before proceeding with
	this adjustment.

1.Turn the spectrum analyzer off by pressing (LINE). Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies as illustrated in Figure 2-2. Connect the CAL OUTPUT to the INPUT. Adjustment locations are shown on the CRT neck for Al7 adjustments and in Figure 2-4 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 A17Rll CUTOFF to midrange.

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 A17Rll CUTOFF until the display is visible and A17R34 COARSE FOCUS for best possible focus.

Cutoff Adjustment

6. Press (PRESET), (DISPLAY), IImNSITY , 255 (ENTER), STORE IIfTEMSITY , MORE 1 of 2,

FOCUS, 127 [ENTER), STORE FOCTJS, then GRAT OM OFF (OFF). Adjust A17Rll CUTOFF until the retrace line between the bottom of trace A and the annunciators at the bottom of the display just disappears.

Deflection Adjustments

7. Press GRAT ON OFF (ON), MORE 2 of 2 , INTENSITY, 80 (ENTER), STORE INmSITY ,

ICAL), MO&F, I of 2 , and CRT ADJ PATTERN . Fold up the A3 interface assembly to access the adjustments on the A2 controller assembly.

8.Refer to Figure 2-3 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 converge to one single line.

10.Adjust A2R215 DGTL Y GAIN until the two horizontal lines near the top edge of the display converge to one single line.

11.Adjust A2R262 STOP BLANK and A2R263 START BLANK for the sharpest corners of the outer box in the test pattern. The intensity of the corners should be the same as the middle of the lines between the corners.

2-16 Adjustment Procedures