Tektronix 2230, Service Manual

Page: 159 / 483

Adjustment Procedure— 2230 Service
13. Adjust Store Y Offset and Gain (R9224 and
R9222)
a. Set the WAVEFORM REFERENCE/MENU SELECT
switch to MENU SELECT (button out).
f. ADJUST—Ch 1 Acq Pos Offset (R7325) for
minimum separation of the Channel 1 baseline and the
short trace at the top and bottom of the screen.
g. Repeat part e for Channel 2 baseline trace.
b. Use the Menu controls to display the rectangle test
waveforms on the screen by selecting ADVANCE FUNC­
TIONS, DIAGNOSTICS. CAL AIDS, and BOX in that
order.
c. ADJUST— Store Y Offset (R9224) so that the bot­
tom trace of the outside box is exactly aligned with the
bottom horizontal graticule line.
h. ADJUST— Ch 2 Acq Pos Offset (R7335) for
minimum separation of the Channel 2 baseline and the
short trace at the top and bottom of the screen.
d. ADJUST— Store Y Gain (R9222) so that the height
of the inside box is exactly 6 vertical divisions.
15. Check Save Expansion and Compression
a. Set:
e. INTERACTION— Repeat parts c and d until the
height of the inside box is exactly 6 vertical divisions and
the bottom trace of the outside box is aligned with the bot­
tom horizontal graticule line.
14. Adjust Acquisition Position Offset (R7325 and
R7335)
VERTICAL MODE CH 2
VOLTS/DIV (both) 0.1 V
AC-GND-DC (both) DC
WAVEFORM WAVEFORM
REFERENCE/ REFERENCE
MENU SELECT (button in)
a. Set:
VERTICAL MODE BOTH and ALT
AC-GND-DC (both) GND
b. Set the calibration generator to produce a 50 mV
signal.
b. Use the Menu controls to call up Calibrate Vertical
Position procedure on the screen by selecting CAL_V_
POS in the Menu. The display will consist of three short
c. Set the SAVE/CONTINUE switch to SAVE (button
in).
and two baseline traces on the screen.
d. Set the CH 2 VOLTS/DIV switch to 10 mV and
reposition the display.
c. Vertically position the two baseline traces exactly on
the short center stationary trace.
e. CHECK—The display is expanded to 5 divisions in
amplitude.
d. Press in momentary the SELECT C1/C2 switch to
advance to the next level of the test routine. The two
f. Set:
short movable traces should be vertically centered near
the two overlapping baseline traces.
CH 2 VOLTS/DIV 0.1 V
SAVE/CONTINUE CONTINUE (button out)
e. Vertically position Channel 1 baseline trace to the
top and bottom of the screen using the Channel 1 POSI­
TION control. Note the separation of the short trace from
the baseline trace at the top and bottom of the screen.
g. Set the calibration generator to produce a 0.5 V
signal.
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