Figure 1. Display adjustment pattern

TB-9-6625-2164-35 Digitizer Tektronix Type 7D20 Manual
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TB 9-6625-2164-35

g. Adjust VECT LIN for minimum trace separation of the diagonal lines on the display

pattern as shown in figure 1.

h. Press MEMORY DISPLAY/6 and MENU/TEST pushbuttons. MASTER MENU

will clear display.

i. Press MENU/TEST and MEMORY DISPLAY 4, 5, 6 and MENU/TEST pushbuttons.

Press TRIGGERING/MODE AUTO pushbutton.

k. Press TRIGGERING/COUPLING AC pushbutton.

Press TRIGGERING/SOURCE EXT pushbutton.

m. Connect multimeter positive lead to TP810 and negative lead to TP902 (ground) (fig. 2).

n. Adjust AC ZERO R241 (fig. 3) for 0 V dc 2 mV indication on multimeter.

o. Press TRIGGERING/COUPLING DC pushbutton.

p. Adjust DC BALANCE R240 (fig. 3) for 0 V dc 2 mV indication on multimeter.

q. Press AQR MODE/BOTH pushbutton and position CH 1 and CH 2 POSITION

controls to the center graticule line.

r. Connect shorting cable between TP1220 and TP520 TP GND (fig. 4).

s. Connect multimeter negative lead to TP902 (fig. 2) and positive lead to J400 (fig. 4)

and adjust CH 1 TRIGGER OFFSET R518, (fig. 4) for 0 V 2 mV dc on multimeter.

t. Remove shorting cable from TP1220 (fig. 4) and connect to TP 1230 and TP 520 TP