Tektronix 2445A - Page 127

Adjustment Procedure-2445A/2455A Service
b. Connect a 50-kHz, 8-division signal from the Leveled
Sine-Wave Generator to the
CH 2 input connector via a
50-n BNC cable.
c. Center the display on the graticule.
d. ADJUST -Edge Focus (R1864), FOCUS (front-panel
control),
and ASTIG (R977, front-panel preset) for the
most uniform focus over the entire display.
e. Disconnect the test setup.
5. Adjust High Drive Focus (R1842)
NOTE
If the previous step was not performed, first set up
the Initial Control Settings
at the beginning of the
CRT adjustments, then proceed as follows.
5-6
a. Set:
tlV
CH 2 VOL TS/DIV
CH 2 Input Coupling
SEC/DIV
READOUT INTENSITY
INTENSITY
On (tl V readout)
200mV
son DC
200 ns (knob in)
Fully CW
Fully CW
b. Connect a 10-MHz, 6-division signal from the Leveled
Sine-Wave Generator to the CH 2 input connector via a
50-n BNC cable.
c. Center the display on the graticule.
d. ADJUST-High Drive Focus (R1842) for the best
overall focus of the trace and readout.
e. Disconnect the test setup.