Adjust High-Frequency Compensation - Tektronix 2235A Instruction Manual

Adjustment Procedure
-
2235A Instruction
e. Set the generator to produce a 5-division display.
u. ADJUST-The lOOX Attn (C4) for best flat top.
NOTE
v.
Repeat parts p through u until no further improve-
ment is noted.
Use Table
5-4
to identify the correct capacitor
for each channel adjustment.
w. Set the Vertical MODE switch to CH 2.
x. Repeat parts b through v for Channel 2.
Table 5-4
Attenuator Compensation Adjustments
y. Disconnect the test equipment from the instrument.
9. Adjust High-Frequency Compensation (C237),
Delay Line Compensation (R240 and R241), and
Channel 2 High-Frequency Compensation
(C180)
a. Set:
VOLTSIDIV
10 mV
0.1 V
1 V
Vertical MODE CH 1
BW LIMIT
Off (button out)
f. ADJUST-The Chl 1X Attn (C7) capacitor for best VOLTSIDIV (both) 10 mV
front corner. Input Coupling (both) DC
Channel 1
C7
C12
C11
C5
C4
Adjustment
Input C
LF Comp
Input C
LF Comp
Input C
g. Set the CH 1 VOLTSIDIV switch to 0.1 V .
Channel 2
C57
C62
C61
C55
C54
A SECIDIV
A & B SOURCE
0.05 ps
VERT MODE
h. Replace the probe and probe-tip-to-BNC adapter
with a 5 0 4 cable.
b. Connect the positive-going fast-rise square wave
output via a 50-0 cable, a 10X attenuator, and a
i. Set the generator to produce a 5-division display.
50-R termination to the CH 1 input connector.
j.
ADJUST-The Chi 10X Attn (C12) for best front
.
set the generator to produce a 1-MHz, 5-division
corner. display.
k. Replace the 50-0 cable and the 50-R termination
with the probe and probe-tip-to-BNC adapter.
d. Set the top of the display to the center horizontal
graticule line using the Channel 1 POSITION control.
I. Set the generator to produce a 5-division display.
e. ADJUST- HF Comp (C237) for the best front corner
m. ADJUST-The Chl 10X Attn (C11) for best flat top.
with minimum overshoot on the displayed signal.
n. Repeat parts h through m until no further improve-
ment is noted.
f. ADJUST-HF Comp (R240 and R241) for best flat
top on the front corner.
o. Set the CH 1 VOLTSIDIV switch to 1 V .
g. Repeat parts e and f until no further improvement is
p. Replace the probe and probe-tip-to-BNC adapter
noted.
with the 50-R cable and 50-0 termination.
q. Set the generator to produce a 5-division display.
h. Move the cable from the CH 1 input connector to the
CH 2 input connector and reconnect the 1OX attenu-
r. ADJUST-The Chl 100X Attn (C5) for best front
ator. Set the Vertical MODE switch to CH 2.
corner.
s. Replace the 50-Cl cable and 50-0 termination with
i. Set the generator to produce a 5-division display.
the probe and probe-tip-to-BNC adapter.
j.
Set the top of the display to the center horizontal
t. Set the generator to produce a 5-division display.
graticule line using the Channel 2 POSITION control.
REV APR 1990
5-9
Scans
by ARTEK
M .
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