2
Voltage Sensors ¸URV5-Z
Waveform weighting
All ¸URV5-Z AC sensors are cali-
brated so that the rms value is indicated
for a sinewave voltage. With other wave-
forms, e.g. squarewaves, the peak value
is decisive for the type of weighting
employed. Below about 30 mV, the RF
probe and the 10 V insertion unit mea-
sure rms values. Above 1 V, the peak-to-
peak value V
pp
is measured and V
pp
/(2
%
2)
is indicated, which corresponds to the
rms value of a sinewave voltage.
Between 30 mV and 1 V the type of
weighting is determined by the wave-
form.
The measurement of modulated sine-
wave voltages follows a pattern similar to
that of non-sinusoidal waveforms. Up to a
peak value of 30 mV at the envelope´s
maximum (corresponding to 10
Π
W PEP
in 50
:
systems), the true rms value is
measured. With power indication in W or
dBm, the average power is displayed.
Above 1 V (10 mW PEP) and with a mod-
ulation frequency of at least 10 kHz, the
peak value is measured again. In the case
of power measurements, the peak enve-
lope power PEP is indicated without any
calculations being required, and for volt-
ages the value V
PP
/(2
%
2).
Limit values specified for the 100 V
Insertion Unit ¸URV5-Z4 are 20 dB
higher than for the 10 V insertion unit, i.e.
by a factor of 10 for voltages and by a fac-
tor of 100 for power levels. When a plug-
on divider is used with the RF probe, limit
values are to be increased by the amount
of the preceding attenuation.
Sensors
¸URV5-Z7
RF Probe
0395.2615.02
200 µV to 10 (1000) V, 20 kHz to 1 GHz
¸URV-Z6
Accessory Set
0292.5364.02
20/40 dB plug-on dividers and 50
:
BNC adapter for RF probe
¸URV-Z50 50
:
Adapter
0394.9816.50
for power measurements with RF probe at 50
:
sources
¸URV-Z3
75
:
Adapter
0243.9118.70
for power measurements with RF probe at 75
:
sources
¸URV5-Z1
DC Probe
0395.0512.02
1 mV to 400 V
¸URV5-Z2
Insertion Unit 50
:
0395.1019.02/05
200 µV to 10 V, 9 kHz to 3 GHz
¸URV5-Z4 Insertion
Unit
50
:
0395.1619.02/05
2 mV to 100 V, 100 kHz to 3 GHz
Measurement accuracy
Voltage sensors and measuring devices
have a long tradition in RF measurements
but for a long time they were not con-
sidered very accurate. Since 1989,
Rohde&Schwarz has set standards with
its voltage sensors: state-of-the-art zero-
bias Schottky diodes ensuring highly sta-
ble, reproducible measurements. Instead
of using analog methods for linearization
and compensating temperature errors of
the rectifier in the sensors, correction val-
ues are calculated. Each sensor has a
built-in calibration data memory which
holds all individual parameters to be
taken into account by the meter.
This numerical correction offers high
accuracy over the entire dynamic range
of >90 dB and at the same time simplifies
operation: the meter identifies the type of
sensor connected and automatically
adapts to it. When a test frequency is
entered by the user, the frequency
response determined during calibration
may be selected for increasing the mea-
surement accuracy.
The Level Meter ¸URV35 with the Insertion
Unit ¸URV5-Z2 in mobile use
Low-load voltage measurement with the RF Probe
¸URV5-Z7
General
