Adjust Channel 1 Variable Balance; Adjust Channel 2 Invert Balance; Adjust Mfilf Compensation And Gain Balance - Tektronix 2235A Instruction Manual

Adjustment Procedure
-
2235A Instruction
Set the Vertical MODE switch to CH 1.
Repeat parts a through e for Channel 1, adjusting
CHI 215 mV Dc Bal (R33) in part d.
Adjust Channel 1 Variable Balance (R25)
Set both VOLTS/DIV switches to 10 mV.
Rotate the CH 1 VOLTS/DIV Variable control fully
counterclockwise.
Position the trace on the center horizontal graticule
line using the Channel 1 POSITION control.
Rotate the CH 1 VOLTS/DIV Variable control clock-
wise to the CAL detent.
ADJUST-CHI Var Bal (R25) to set the trace to the
center horizontal graticule line.
Repeat parts b through e until there is no trace shift
between the fully clockwise and the fully counter-
clockwise positions of the CH 1 VOLTS/DIVVariable
control.
Return the CH 1 VOLTS/DIV Variable control to the
CAL detent.
Repeat Steps 2 and 3 for Channel 1 until no further
improvement is noted.
AdJust Channel 2 lnvert Balance (R75)
Set the Vertical MODE switch to CH 2.
Position the trace on the center horizontal graticule
line using the Channel 2 POSITION control.
Set the INVERT switch to On (button in).
ADJUST-CH2 lnvert Bal (R75) to set the trace to
the center horizontal graticule line.
Set the INVERT switch to Off (button out).
Repeat parts b through e until there is no trace shift
when switching the INVERT switch between the On
and Off positions.
g. Readjust CH 2 lnvert Bal (R75) slightly so that the
trace shift is less than one division as the CH 2
VOLTS/DIV Variable control is rotated between fully
clockwise and counterclockwise positions.
h. Set the CH 2 VOLTS/DIV Variable control to the CAL
detent.
i.
CHECK-The trace shift is less that 1.5 divisions
when the INVERT switch is set from Off (button out)
to ON (button in).
j.
Repeat parts b through i until the trace shift require-
ments for both INVERT and CH 2 VOLTS/DIV
Variable are met.
k. Rotate the CH 2 VOI-TSIDIV Variable control clock-
wise to the CAL detent, and set the INVERT button to
OFF (button out).
I. INTERACTION
-
Repeat steps 2 and 4 for CH 2 until
no further improvement is noted.
5. Adjust MFILF Compensation and Gain Balance
(C53, R97, C3, and R47).
a. Set:
INVERT Off (button out)
Vertical MODE CH 2
VOLTS/DIV (both) 10 mV
Input Coupling (both) DC
A SEC/DIV 20
FS
b. Connect the high-amplitude square wave output via
a 5 0 4 cable, a 10X attenuator, and a 50-a termi-
nation to the CH 2 input connector.
c. Set the generator to produce a 10-kHz, 5-division
display.
d. Set the top of the display on the center horizontal
graticule line using the Channel 2 POSITION control.
e. ADJUST-CH2 MF/LF Comp (C53) and CH2 MF/LF
Gain Bal (R97) for the best front corner and flat top.
f.
Move the cable from the CH 2 input connector to the
CH 1 input connector. Set the Vertical MODE switch
to CH 1.
NOTE
g. Set the top of the display on the center horizontal
graticule line using the Channel 1 POSITION control.
If
the trace shift is less then
I
division when
rotating CH 2 VOLTSIDIV Variable control
h. ADJUST-CHI MF/LF Comp (C3) and CHI MF/LF
between its clockwise and counterclockwise
Gain Bal (R47) for the best front corner and flat top.
positions, proceed to step], otherwise proceed
to step g.
i.
Disconnect the test equipment from the instrument.
Scans
by ARTEK MEDL4
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