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Sect,
Mage I
4.T2
WAVEFORM
The
waveforms
in this section are reproductions
of
yavelorms
obtained
with a -hp- Model
150A
oscil-
loscope. An input probe with
a
voltage
division ratio
oI
10:1 and
an impedance
of
10
megohms shunted
by
J0
uuf was
used. Voltages
€iiven
indicate
the signal
amplitude at the input to the probe.
Most waveforms were
obtai:red
wlth the oscilloscope
synchronized
from
an
external source in order
to
maintain t}le
correct time relationships for
a
partic-
ular
group
of waveforms. In most maintenance work
the
actual
v/aveshape
will
usually be more important
than the
time
relationship to other waveJorms of the
same
group. For t}lis reason, either + or
-
internal
sync,
will
usually be more
convenj.ent
than
the type
of sync. indicated.
Any reasonably
good
oscilloscope may
be used
to
observe these waveforms. Check the response of
the
scope
using
a
1
kc square wave.
U
the
scope
wiII
reproduce a good
1
kc
square wave
it
will
be
adequate
to observe the waveforms in this instrument.
Some
oI the
smaU
irregularities
i[
the
wavelorms may not
be
reproduced
i-l
the
oscilloscope used.does not
have
a
wide bandwidth but
the
results
should be
adequate.
AII
waveforms were obtained with the FUNCTION
SELECTOR
in the
CHECK
position.
The
oscilloscope
is
the
onl]' external equipment required to obsen
e
these waveforms.
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