Tektronix 422 - Page 116

Performance Check/Calibration—Type 422 AC-DC
r
J
—
[opt
mum
sqi
c
are
orre<
corn
t
er cnd lat
top)
(A)
V
—L
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e ar
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d tc
rect
)p n
ot f at)
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1
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i
l_ 4
Fig. 5-17. (A) Typical CRT displays showing correct and incorrect compensation, (B) location of compensation adjustments (bottom).
given in Table 5-4. Readjust the generator output ampli
tude at each setting to maintain a four-division display, or
to provide maximum vertical deflection, in the 20 position.
e. ADJUST—Channel 2 VOLTS/DIV switch compensa
tion as given in Table 5-4 (use low-capacitance screwdriver).
First adjust for optimum square corner and then for opti
mum flat top. Remove the 10X attenuator and 50-ohm
termination as given in Table 5-4 and readjust the generator
output amplitude at each setting to maintain a four-division
display, or to provide maximum deflection in the 20 posi
tion. Fig. 5-17B shows the location of the variable capa
citors.
f. Disconnect all test equipment.
27. Check/Adjust High-Frequency Compensation
a. Connect the square-wave generator fast-rise + output
connector to the INPUT 1 connector through the GR to
BNC adapter, 18-inch 50-ohm BNC cable and the 50-ohm
BNC termination.
b. Change the following control settings:
CH 1 & 2 VOLTS/DIV .05
Vertical Mode CH 1
TIM E/DIV .5 /ts
X10MAG Pulled out
5-22