Calibration—475
f. Adjust the Square-Wave Generator for 5 divisions of a
100 kHz signal.
g. CHECK—Repeat step 31-d.
h. ADJUST—C471 and C477 (see Fig. 5-18) with a
low-capacitance screwdriver, for the best flat-top waveform.
i. Move the test signal to CH 2 input.
j. Set the VERT MODE switch to CH 2, the CH 2
AC-GND-DC switch to DC, and the CH 2 VOLTS/DIV
switch to 5 mV.
k. Adjust the Square-Wave Generator for a 5 division
display of a 10 kHz signal.
I. CHECK—Repeat step 31-d.
m. ADJUST—R239, R475, C471, and C477 (see
Fig. 5-17 & 5-18), for the best flat-top waveform.
n. CAL A ID —Compromise the adjustment of R475,
C471, and C477 for the best response for both CH 1 and
CH 2.
o. Disconnect the test setup from the Square-Wave
Generator to the CH 2 input.
p. Connect the output of the Fast-Rise High-Amplitude
Pulse Generator (Type 109) to the CH 1 input via a 50 £2
5 ns GR cable, (2) X10 GR attenuators, X5 GR attenuator,
a 50 £2 GR termination, and a GR-to-BNC adapter.
q. Set the Pulse Generator polarity to + and the voltage
range to 50 V.
r. Adjust the Pulse Generator for five divisions of
deflection.
s. CHECK—Repeat step 31-d.
t. ADJUST—Cl 75, R175, C133, R133, Cl 12, and R112
(see Fig. 5-17), with a low-capacitance screwdriver, for the
best flat-top waveform.
u. CAL A ID —C175 and R175 affect aberrations 10 ns
from the leading edge; C l33 and R133 affect aberrations
2 ns from the leading edge; Cl 12 and R112 affect the front
corner aberrations.
v. Move the test signal to the CH 2 input.
w. Set the VERT MODE switch to CH 2 and adjust the
Pulse Generator for five divisions of deflection.
x. CHECK—Repeat step 31-d.
y. ADJUST-C275, R275, C233, R233, C212, and R212
(see Fig. 5-17), with a low-capacitance screwdriver, for the
best flat-top waveform.
z. CAL A ID —C275 and R275 affect aberrations 10 ns
from the leading edge; C233 and R233 affect aberrations
2 ns from the leading edge; C212 and R212 affect the front
corner aberrations.
aa. Disconnect the test setup.
32. Adjust CH 2 VOLTS/DIV Compensation
a. Set the VERT MODE switch to CH 2, both AC-GND-
DC switches to DC, both VOLTS/DIV switches to 5 mV,
and the A TIM E/D IV switch to 0.2 ms.
b. Connect the high-amplitude output of the Square-
Wave Generator (Type 106) to the CH 2 input via a
GR-to-BNC adapter, 42-inch 50 12 BNC cable, X10 BNC
attenuator, 50 12 BNC termination, and a 20 pF normalizer.
c. Adjust the Square-Wave Generator for a five division
display of a 1 kHz signal. Add or remove attenuators as
necessary to maintain a five division display throughout this
step.
d. CHECK—CRT display for flat-top waveform with no
more than 2% overshoot or roll-off on the leading edge.
e. ADJUST—CIO (see Fig. 5-19) with a low-capacitance
screwdriver for best flat-top waveform.
f. Turn the CH 2 VOLTS/DIV switch to 2 mV.
5-36
®
g. CHECK—Repeat step 32-d.
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