Rohde & Schwarz URV5-Z4 - Page 21

2.3.2.2.1
General
Remarks
on
RP
Measurements
an
RF
Probes
1. waveform weighting
The URVS reads out the rms value of sinewave voltages of any
magnitude as long as they are within the measurement range of
the instrument. with other waveforms, however, the weighting
is
dependent
on
the
magnitude
of
the
voltage
to
be
measured,
since
a
diode
detector
has
a
square-law
response
only
at
low
voltages
up
to
about
30
mv
and
therefore
measures
the
true
rms
value
only
up
to
this
value
independent
of
the
waveform
of
the
test
voltage.
This
range
can
be
expanded
to
3
V
by
means
of
plug-on
voltage
dividers,
so
that
the
true
rms
value
of
an
AC
voltage
can
be
measured
in
the
range
from
200
uv
to
3
V.
Inim-
miuiblo
am
mn-
S
h
Iva-«luv
mm
(M!)
and
null-volu-
III-um
(right)
5
|
I
20
I
.
'
'\
i
w
i
c
my
one:
10
05S
|
‘
III-volu-
l
‚2‘
i
mow-um
I
3
Mqaiue’
\‚l
mum:
1.5 f
I
'
Mun'v)
'
mu-
n
1 m. Hanna-nun with "I. 104! mm Ii! '. l ; n
3 10 so mV or power um . 1 3 10 v
Hume-In
with
not:
and
10-5
divider
30 1M zoo IN or ”V Mica UR 10 30 wo V
w
m
not:
no woo mo av u 50-. his 100 no am v
hummmmm-vMNMWnMSWWUMImm.
Fig.
2—4
Waveform
weighting
and
maximum
crest
factor
for
RF
measurements
using
URVS
probes
In
the
transition
range
from
rms
to
peak-responding
measure-
ment
the
measured
value
is
only
defined
for
sinewave
voltages.
In
Fig.
2-4
the
maximum
permissible
crest
factor
is
shown
as
a
function
of
the
magnitude
of
the
test
voltage
at
which
the
er-
ror
of
the
measured
rms
value
relative
to
the
true
rms
value
does
not
exceed
2%
or
5%.
394.8010.02
2.11
3-2
2.3.2.2
AC Proben
2.3.2.2.1
General Remarks on RP Heasurements
ad RP Probes
1 . Nhveform weightíng
The URV5 reads out the uns Value of sinewave voltages of any
magnitude as lang as they are mithin the measurement Range of
the Instrument. Voith Other waveforms, however, the weighting
is dependent on the magnitude of the voltage to be measured,
since a diode detector has a Square-law response
only at low
voltages up to about 30 mV and therefore measures the true ums
Value only up to this Value Independent of the waveform of the
test voltage. This range Can be expanded to 3 V by ne ans of
plug-on voltage dividers, so that the true ums Value of an AC
voltage Can be measured in the range fror 200 UV to 3 v.
lııiıııı
ıırıiııiblı oııı lıctı S
la
fııı-vılııı ıııııınıııııı (Mn
and
pıık-vılııı ıı-ıııııııın (light)
s
zu
10-
3.
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L
l I
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Fıııı-vılue ›
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S
20
so
3
es
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i
1
ı
ı
2
1
10
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ı
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ı
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ı ,
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I
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g
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\
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\ .
leıghmq
ımı
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ıflııoııııı
•
10 v
30
Zoo
sog
mV
tlıısıırıııııt ıiflıırılıııııd20-dßivilu
ff 100-viıııfliıııııii
10
30
100 v
ınoo
nıııı~ııw vlH~ır*
-so-ı aviıı
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All) 30% IV
I1)
ınıııı ııınııııonııgıonııııuıınmıı-vııuıııaııııvııııııııuınıııııı-nngıod-dofıybfsınıııoıøılvønıqıs.
Immo
v
Fig. 2-4
waveform weightíng ad maximum crest factor
measurements u sing URV5 probes
for RF
In the transition range fror ums to peak-responding
measure-
ment the measured Value is only defined for sinewave voltages.
In Fig. 2-4 the maximum permíssíble crest factor is shown
as a
function of the magnítude of the test voltage at which the
er-
ror of the measured ums Value relative to the true
ums Value
does not exceed 2% er 5%.
394.8010.02
2.11
E-2