■ Root-mean-square value signal
This the value the (positive) signal producing the same heating when passes through specified
resistance.
■ Minimum measurable value (or threshold))
This the smallest measurable value.
An AVG-type instrument only capable giving correct results for pure sinusoidal signals.
■ Resolution
This the smallest measurable difference value. defined minimum measurable value and a
maximum measurable value
■ Rated calibre
An instrument's calibre the value the quantity measured which corresponds the upper limit the
measurement range.MULTIMETERS
Theoretical Introduction
Multimeters
A few definitions:
■ Measurement range
This represents the limits within which the digital instrument performs specified that the results are not subject
to rate error which higher than the maximum tolerated.
A TRMS (AC+DC) "true root-mean-square" multimeter capable measuring the RMS value signals,
whatever their shape and whether they include component not. also the value measurement count quantification unit,
usually called the "unit". For example, for ammeter, the upper limit the range its calibre A. For instrument providing good conversion linearity, may equal the
resolution.
Multimeter RMS RMS
Ua multimeter multimeter )
t
Sinusoidal signals
with component
^ ř
Accurate Accurate Accurate
0
w
i
Distorted sinusoidal signals
with component
[ *
Error
of30 %
by default
Accurate Accurate
0
w u
)
Distorted signals
with component
k \
\ W
Error
of30 %
by default
Error
by default
(depends
on Udc value)
Accurate
0
umlmx-
