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Waveform
Making Complex
The Sinclair DM350 and DM450 are calibrated to display
wave whose average
sine
value of
a
the
actually measured. Thus,
if
displayed value will not be
the
the
waveform
amount dependent
on
the
value gives
heating
power
peak waveform height. The
than the
valuable to know
shows
how to obtain both from
Measurements
AC
the
rms
half-wave rectified value
input waveform
not sinusoidal,
is
the
be
rms but
will
in
error by an
the
shape.
Although
the
waveform, this
often less
of
is
table below
the
reading displayed.
Avoiding Ground Loop
the
adaptor/charger
if
AC
the
be
set
signal
is
if
up
ground. This effect
AC
power
but
to avoid
meter,
making AC
measurements,
rms
inject signals by capacitive coupling
revert to battery operation
True rms
Wave-
Displayed
form
Value
Value
0.707E
0.707E
sine
1.11
1.015
square
E
0.555E
0.547E
triangle
Interference
connected, ground
loop currents can
is
source ground
at
different potential
is
a
attenuated
will
be greatly
completely, revert to battery operation. When
it
differences can also
AC
potential
through the adaptor.
becomes
this
problem.
if
a
Multiply Displayed
Value by
for
for
peak
rms
1.414
1.0
0.9
0.9
1.034
1.801
than
the
by
Again
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