Tektronix 2230 Service Manual page 162

Adjustment Procedure— 2230 Service
m. Set the generator to produce a 5-division display.
n. Set the top of the display to the center horizontal
graticule line using the Channel 2 POSITION control.
o. ADJUST—Ch 2 HF Comp (Cl 80) for 2% overshoot
(0.1 division) on the displayed signal.
p. Set the CH 2 VOLTS/DIV switch to 5 mV.
q. Repeat parts i through k for Channel 2.
20. A djust 2-mV Peaking C om pensation
(C76 and C26)
a. Set both VOLTS/DIV switches to 2 mV.
b. Set the generator to produce a 5-division display.
c. Set the top of the display to the center horizontal
graticule line using the Channel 2 POSITION control.
d. ADJUST—2mV Peak (C76) for 2% overshoot of the
displayed signal.
e. Move the cable from the CH 2 OR Y input connector
to the CH 1 OR X input connector. Set the VERTICAL
MODE switch to CH 1.
f. ADJUST—2mV Peak (C26) for 2% overshoot of the
displayed signal.
21. A djust A cq uisitio n High Frequency Peaking
(C2103, R2149, and C2113)
a. Set:
VOLTS/DIV (both)
STORE/NON STORE
SAVE/CONTINUE
PRETRIG/POST TRIG
b. Set the WAVEFORM REFERENCE/MENU SELECT
switch to MENU SELECT (button out).
5-14
10 mV
STORE (button in)
CONTINUE (button out)
POST TRIG (button out)
c. Use the Menu controls to call up SELECT MODE
Table on the screen and select AVERAGE with the
SELECT C1/C2 button.
REFERENCE/MENU SELECT switch to WAVEFORM
REFERENCE (button out).
d. Set the generator to produce a 5-division display.
e. Set the top of the display to the center horizontal
graticule line using the Channel 1 POSITION control.
f. ADJUST— Ch 1 Acq HF Peak (C2103) and Acq HF
Peak (R2149) for best front corner.
g. Set the SAVE/CONTINUE switch to SAVE (button
in).
h. CHECK— Display aberrations are within 4% (0.2
division or less).
i. Move the cable from the CH 1 OR X input connector
to the CH 2 OR Y input connector. Set the VERTICAL
MODE switch to CH 2.
j. Set the SAVE/CONTINUE switch to CONTINUE (but­
ton out).
k. Repeat part e using Channel 2 POSITION control.
1 . ADJUST— Ch 2 Acq HF Peak (C2113) for best front
corner.
m. Repeat parts g and h for Channel 2.
n. INTERACTION— It may be necessary to compro­
mise the Ch 1 Acq HF Peak (C2103) and Acq HF Peak
(R2149) adjustments in part f and the Ch 2 Acq HF peak
(C2113) adjustment in parti, to obtain the best high-
frequency match between Channel 1 and Channel 2.
o. Disconnect the test equipment from the instrument.
Reset the WAVEFORM