4 Adjust Astigmatism and Auto Focus R887 and R875

Channel 1 AC-GND-DC A SEC/DIV A TRIGGER MODE

DC 20 lis AUTO

b. Connect a leveled sine-wave generator via a 50 Q cable and a 50 fi termination to the CH 1 OR X input connector.

c. Adjust the generator output for a 4-division, 50 kHz display.

d. ADJUST—Both the Astig adjustment (R887) and the AUTO FOCUS control for the best focused display over the range of the AUTO INTENSITY control.

f. ADJUST—Auto Focus Adj (R875) for the best focused display. Do not change the front panel AUTO FOCUS control.

g. Disconnect the test setup.

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