Adjust 2-Mv Peaking Compensation; Check Bandwidth - Tektronix 2235A Instruction Manual

Adjustment Procedure
-
2235A instruction
k. ADJUST-Ch2 HF Comp (C180) for the best front
corner with minimum overshoot on the displayed
signal.
10. Adjust 2-mV Peaking Compensation (C76 and
C26)
a. Set both VOLTSIDIV 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-Ch2 2mV Peak Comp (C76) for the best
front corner with minimum overshoot of the dis-
played 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. Repeat parts b through d for Channel 1, adjusting
Chl 2mV Peak Comp (C26) in part d.
g. Disconnect the test equipment from the instrument.
NOTE
Install the instrument cabinet for the remaining
vertical checks and allow a 20-minute warm-
up period before continuing with the Adjust-
ment Procedure. See the Cabinet remove and
replace instructions locatedin the Maintenance
section of the manual.
1 1. Check Bandwidth
a. Set:
Vertical POSITION (both) Midrange
BW
LIMIT
Off (button out)
VOLTSIDIV (both) 2 mV
VOLTSIDIV Variable (both)
CAL detent
Input Coupling (both) DC
A SECIDIV
20
NS
b. Connect the leveled sine-wave generator output via
a 50-a precision cable and a 50-a termination to
the CH 2 input connector.
c. Set the generator to produce a 50-kHz, 6-division
display.
d. CHECK-Display amplitude is 4.2 divisions or
greater as the generator output frequency is
increased up to the value shown in Table 5-5 for the
corresponding VOLTSIDIV switch setting.
Table 5-5
Settings for Bandwidth Checks
VOLTSIDIV Generator
Switch Setting Output Frequency
90 MHz
5 m V t o 5 V 100 MHz
e. Repeat parts c and d for all indicated CH 1 VOLTS/
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
f. Move the cable from the CH 1 input connector to the
CH 2 input connector. Set the Vertical MODE switch
to CH 2.
g. Repeat parts b and c for all indicated CH 2 VOLTS1
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
h. Disconnect the test equipment from the instrument.
NOTE
T o continue with the Adjustment Procedure,
remove the instrument cabinet and allow a
20-minute time period to elapse before con-
tinuing with the Adjustment Procedure. See the
Cabinet removal instructions located in the
Maintenance section of the manual.
Scans
by ARTEKMEDLQ
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