Adjust Attenuator Compensation - Tektronix 2236 Instruction Manual

Adjustment Procedure— 2236 Service
6. Adjust Attenuator Compensation (C l2, C62, C55,
C5, C51, C61, C54, C l, C11, and C4)
a. Set both VOLTS/DIV switches to 0.1 V.
b. Set the generator to produce a 10-kHz, 5-division
display.
c. Set the top of the display on the center horizontal grat­
icule line using the Channel 1 POSITION control.
If C12 needs to be adjusted in the following step, the
DMM Channel 1 Volts accuracy will be affected. After
performing part d, Step 6 in the "CTM" section must
be checked to assure DMM accuracy.
d. ADJUST—Ch 1 10X LF Comp (C12) for best front
corner.
e. 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.
f. ADJUST—Ch 2 10X LF Comp (C62) for best front
corner.
g. Set both VOLTS/DIV switches to 1 V.
h. Remove the 10X attenuator from the input signal path.
i. ADJUST— Ch 2 100X LF Comp (C55) for best front
corner.
j. 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.
k. ADJUST—Ch 1 100X LF Comp (C5) for best front
corner.
. Disconnect the test setup.
l
m. Set:
VERTICAL MODE
CH 2 VOLTS/DIV
Input Coupling (both)
A SEC/DIV
5-8
NOTE
CH 2
10 mV
AC
0.2 ms
n. Connect the high-amplitude square wave output via a
50-0 cable, a 10X attenuator, a 50-0 termination, and the
precision normalizer to the CH 2 OR Y input connector.
o. Set the generator to produce a 1-kHz, 5-division
display.
p. Set the top of the display on the center horizontal
graticule line using the Channel 2 POSITION control.
q. ADJUST— Ch 2 Input Standardizer (C51) for best flat
top.
r. Set the CH 2 VOLTS/DIV switch to 0.1 V.
s. Remove the 10X attenuator from the input signal path.
t. ADJUST— Ch 2 10X Input C (C61) for best flat top.
u. Set the CH 2 VOLTS/DIV switch to 1 V.
v. Remove the terminator from the input signal path and
set the generator to produce a 5-division display.
w. ADJUST— Ch 2 100X Input C (C54) for best flat top.
x. Disconnect the test equipment from the instrument.
y. Set:
VERTICAL MODE
CH 1 VOLTS/DIV
CTM
z. Connect the Ac Calibration System output via a 50-0
cable to the CH 1 OR X input connector.
aa. Set the calibrator to produce a 20-kHz, 400-mV out­
put signal.
ab. Note the CTM display reading for use in parts ad, af,
and ah.
ac. Insert the precision normalizer into the signal path
and increase the calibrator output voltage to 800 mV.
CH 1
20 mV
CH 1 VOLTS
REV JAN 1985