Adjustment Procedures
5-
14
Adjust High Frequency Compensation
(R304,
R305, R341,
and C304)
Procedure
a. Set:
SEC/DIV ........................
..
CH1
VOLTS/DIV ............ .
0.2 µs
10mV
b.
Connect
the
positive-going fast-rise
square
wave
output
from
the calibration generator
via
a 50 Q BNC coaxial cable, a 10X
BNC
attenuator,
and
a 50 n termination
to
the
CH
1 OR X
input
connector.
c.
Set
the
pulse
generator to
produce
a 1 MHz, five-division
display.
d.
Set
the
top
of
the
displayed waveform to
the
center horizontal
graticule
line
using
CH
1 POSITION control.
e.
Adjust : Compensation (R304, R305, R341
and
C304) for a
response as flat as possible. Repeat
adjustments
until
no
further improvements are noted.
f.
Set:
CH
1 VOLTS/DIV to 5 m
V.
g.
Set
the
pulse
generator for a five-division signal.
h. Check for aberrations less
than
±6%
(0.3 division).
i.
Set:
CH
1 VOLTS/DIV to 10 mV.
j.
Set
the
pulse
generator for a five-division signal.
k.
Check for aberrations of
±4%
(0.2 division) or less.
1.
Repeat
part
k for each
CH
1 VOLTS/DIV
switch
setting from
20 mV
through
0.2
V.
Adjust
the
pulse
generator
output
and
add
or
remove the 10X BNC attenuator as necessary to
maintain a five-division display at
each
VOLTS/DIV
switch
setting.
NOTE
Some generators do
not
produce enough signal amplitude to test
above
0.2
volts/div. Omit steps m through
q,
if
necessary.
Adjustment
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