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Hitachi V-151F - Measurement Procedures; Probe Adjustment and Compensation

Hitachi V-151F
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The
knob
and
hook
cover
may
be
turned
in
any
direction,
but
care
must
be
used
not
to
discon
nect
the
ground
over
that
holds
the
hood
cover
in
place
by
an
internal
spring,
which
could
loosen
or
break.
(4)
Measurement
The
probe
exhibits
high
resistance
and
low
capacitance
at
x
10
however,
the
input
voltage
is
attenuated
to
1/10
and.
This
must
be
accounted
for
in
voltage
measurements.
Measured
voltage
=
Sensitivity
of
oscilloscope
V/DIV.
X
screen
amplitude
div
x
10
At
x
10,
it
is
necessary
to
correct
the
pulse
characteristic
by
adjusting
the
capacitor
in
the
probe
for
flat
top
of
the
square
wave
calibration
voltage.
(5)
Adjustment
of
Probe
When
observing
the
signal
waveforms
of
high
impedance
circuits,
the
operation
of
the
signal
source
and
waveforms
on
the
screen
may
change
due
to
the
input
impedance
of
the
oscilloscope,
parallel
capacitance
of
a
coupling
line,
induc
tion
noise
and
other
effects
leading
to
measure
ment
error.
The
use
of
a
low-capacitance
probe
avoids
these
effects.
A
low-capacitance
probe
be
used
for
high
impedance
circuitry
measure
ments.
Its
input
impedance
is
lOMH
at
22pF.
When
adjusting
the
probe
observing
CAL
@
,
adjust
the
capacitance
correction
trimmer
in
the
probe
using
a
small
screw
driver,
to
pro
vide
proper
square
wave
compensation.
Capacitance
correction
trimmer
Under
Correct
Over
N
K-
12

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