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HP 212A - Page 27

HP 212A
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10,
TOP
OF
PULSE
ROLLS
OFF
PREMATURELY
BETWEEN
1
and
6
yseconds
17-
*-
-
-
-
-*--
-
---
11.
EXCESSIVE
SLOPE
ON
TOP
OF
PULSE
-
-
---:
-
12.
VARZATlON
OF
PULSE
AMPLITUDE
WITH
CHANGE
IN
RATE
OR
LENGTH
-I---------
C135)
C
136)
C137)
C138)
R30
::I
V
17
V15
Replace
defective
capacitor
in
pulse
delay
line.
Pad
value
of
R30
to
give
optimum
pulse
level
for
both
low
and
high
rates.
Value
varies
between
50
and
100
ohms.
ReplaceV11)
occurswith
Replace
C5
)
old
components
Replace
V
17.
Check
maximum
positive
pulse
amplitude.
Replace
V
15.
Check
maximum
positive
pulse
amplitude.
Adjust
value
of
R51
to
give
minimum
amplitude
variation
with
changes
in
rate.
I
-
R5
1

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