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Hitachi V-151F - Probe Connection Precautions; Low-Capacitance Probe Usage; Ground Connection Best Practices; Synchronization Methods

Hitachi V-151F
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(6)
Precautions
on
Direct
Connection
and
Using
a
Probe
Two
different
methods
are
available
for
applying
signals.
One
is
to
connect
a
lead
wire
to
the
input
terminal
of
the
oscilloscope
directly,
and
another
is
to
use
a
probe.
When
viewing
a
small
signal
in
a
circuit
having
high
signal
source
impedance,
error
may
occur
in
measurement
due
to
the
effect
of
parallel
capacity
or
induced
noise
in
the
input
cable.
The
following
precautions
should
be
observed
to
avoid
false
readings.
Generally,
with
the
exception
of
a
low-impedance
circuit,
the
use
of
a
lead
wire
should
be
avoided.
If
a
lead
wire
other
than
the
probe
or
shielded
wire
is
used,
make
the
lead
as
short
as
pos
sible.
When
using
a
shielded
wire
in
a
circuit
having
high
impedance,
attention
should
be
p'aid
to
the
loading
effects
of
the
sum
of
the
input
capacitance
of
the
oscilloscope
and
the
dis
tributed
capacitance
of
the
probe
or
shielded
wire
on
the
signal
source.
The
input
terminal
of
the
oscilloscope
has
a
capacitance
of
about
30pF
in
parallel
with
lMf2.
If
the
effect
of
this
parallel
capacitance
on
the
high
impedance
signal
source
cannot
be
ignored,
the
use
of
the
low
capacitance
xlo
probe
is
recommended.
(7)
Low-capacitance
probe
To
avoid
the
ill
effects
by
direct
connection,
use
a
low-capacitance
probe
(xiO)
whenever
pos
sible.
When
this
probe
is
used,
input
impedance
is
lOMH,
22pF,
making
it
possible
to
reduce
the
loading
effects
upon
the
signal
source
to
a
great
extent.
However,
when
the
probe
is
used
at
xio,
the
input
signal
is
attenuated
to
1/10.
This
must
be
taken
into
account
in
all
measurements.
(8)
Ground
Connection
When
using
a
probe,
connect
to
a
ground
point
close
to
the
signal
source
and
use
the
probe
ground
wire.
Triggering
on
waveforms
The
most
important
factor
in
operating
to
lock
and
display
waveforms
properly
before
measuring
them
with
the
oscilloscope.
(9)
How
to
provide
synchronization
o
Select
the
position
of
the
SOURCE
switch
@
according
to
the
connector
where
sync
signal
is
supplied.
Also
select
the
position
of
the
MODE
13

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